Repair material and repair method for existing manhole openings in conduit pipes

Abstract

To address the challenges of unstable strength in joints and connecting members, making it difficult to prevent water from entering the pipe, and the inability to guarantee permanent watertightness in pipe connection structures, we provide pipe joint members, pipe connection structures, and pipe construction methods that combine watertightness and durability. [Solution] A joint member used in a connection structure between a manhole for a conduit and the pipe opening at the end of the conduit, the joint member having a flange-shaped portion having a shape that conforms to the wall surface of the manhole and having an electric heating wire embedded in it; 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, and an input terminal for an external power supply, a conduit connection structure, and a conduit construction method.

Description

[Technical Field]

[0001] The present invention relates to a joint member for an existing pipe culvert manhole opening, a pipe culvert coupling structure at an end of a pipe culvert, and a pipe culvert construction method. [Background Art]

[0002] As of the end of Reiwa 2, the total length of sewer pipe culverts nationwide is approximately 490,000 km, of which the total length of pipe culverts that have exceeded the standard service life of 50 years amounts to approximately 25,000 km (5% of the total length). These existing pipe culverts are significantly aged due to long-term deterioration over years, ground subsidence, or increased traffic loads, and water leakage accidents, road subsidence, odor problems, etc., which are considered to be caused by damage to pipe culverts, occur frequently. It is known that the amount of aged pipes that have exceeded the standard service life and require rehabilitation will increase rapidly 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. Therefore, planned maintenance, management and reconstruction are required to ensure sustainable sewerage functions.

[0003] Furthermore, even for rainwater pumping stations that require reliable operation during rainfall, as of the end of Reiwa 2, among approximately 1,600 rainwater pumping stations nationwide, approximately 1,300 facilities (81% of the total) have exceeded the standard service life of 20 years for equipment, showing the same tendency.

[0004] Furthermore, there have been frequent cases where the amount of sewage, including infiltrated water during rainy weather, exceeds the treatment capacity of sewerage facilities due to rising groundwater levels caused by typhoons and sudden concentrated heavy rain. Infiltrated water during rainy weather has long been treated as a temporary phenomenon accompanying rainfall, and has not been sufficiently considered in facility planning.

[0005] However, the increase in the volume of such water has become a problem in recent years. Factors for infiltrated water during rainy weather include increased rainfall due to climate change, aging of sewage pipe culvert facilities, incorrect connection of drainage facilities, etc. The increase in infiltrated water during rainy weather causes problems such as overflow from sewage pipelines, backflow into residential buildings, and impact on public water areas due to reduced function of treatment facilities, so countermeasures against infiltrated water are required.

[0006] Patent Document 1 discloses a pipe connection method for the joint between a manhole and a pipe, and a method for rehabilitating aging pipes. It describes a method of pressing connecting members together using a thermosetting or photocuring liner. Patent Document 1 describes pressing the liner to the connecting member during the construction of an existing culvert. However, it does not acknowledge the problem that differences in the pressure between the joint and the connecting member may occur depending on the thickness of the liner and the pressing method. The construction method described in Patent Document 1 had a problem in that reducing the thickness of the lining material made it impossible to obtain a liner with sufficient strength, which reduced the strength of the joint and connecting member, making it difficult to prevent water infiltration.

[0007] Patent Document 2 discloses a pipe joint structure for pipes, pipe joint elements, and a pipe construction method. It describes a step of heating and welding the joint element and a liner covering the manhole with an electric heating wire, and a step of lining the joint element and pipe with an outer film, and then heating and welding the joint element and the outer film with an electric heating wire. Patent document 2 does not describe shaping pipe joint elements to match the wall surface of a manhole. The pipe joint elements described in Patent Document 2 had a problem in that, depending on the shape of the inner wall of the manhole, they could not adequately guarantee integration with the manhole liner after heat welding, and thus could not maintain permanent watertightness. [Prior art documents] [Patent Documents]

[0008] [Patent Document 1] Special Publication No. 2022-509049 [Patent Document 2] Japanese Patent Publication No. 2023-175379 [Overview of the project] [Problems that the invention aims to solve]

[0009] Conventional connecting members have two main challenges: a technical issue where differences in the compression of the connecting member can occur at the joint between the pipe and the manhole; and a problem where reducing the thickness of the lining material leads to unstable strength between the joint and the connecting member, making it difficult to prevent water from seeping into the pipe. Furthermore, conventional pipe joint elements have the problem of not being able to guarantee permanent watertightness in pipe connection structures using them. This invention was made to solve these problems and aims to provide a pipe joint member that achieves both high watertightness and durability, a pipe connection structure using said member, and a pipe construction method. [Means for solving the problem]

[0010] The invention according to claim 1 relates to a joint member used in a connection structure between a manhole for a conduit and the pipe opening at the end of the conduit, characterized in that it comprises a sleeve-shaped portion formed to match the inner diameter of the conduit and a flange-shaped portion provided on the outer circumference of the sleeve-shaped portion, the flange-shaped portion having a shape that conforms to the wall surface of the manhole, an electric heating wire 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 supply.

[0011] The invention according to claim 2 relates to the joint member according to claim 1, characterized in that the joint member contains a polyethylene resin as its main component.

[0012] The invention according to claim 3 is a joint structure for a manhole for a conduit and a pipe opening at the end of the conduit, wherein the joint member described in claim 1 or 2 is used, the joint 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 joint structure, and a multilayer structure comprising, from the surface side, an outer film, an intermediate layer, and an inner film of thermoplastic resin on the inner surface of the conduit 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 inner film is covered by the other surface of the intermediate layer.

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

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

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

[0016] The invention according to claim 7 is a pipe construction method for constructing the joint structure described in claim 3, wherein the 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 member provided in the joint structure, and a multilayer structure comprising, from the surface side, an outer film, an intermediate layer, and an inner film of a thermoplastic resin on the inner surface of the pipe and the inner surface of the joint member, wherein 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 pipe construction method comprises (A) a step of covering the wall surface of the manhole with an injection material layer, and (B) a step of covering the injection material layer with a liner after step (A), The present invention relates to a pipe construction method comprising: C) After step (B), heating and welding the joint member to the liner and joint by applying power from an external power source to a heating wire embedded in the joint member; D) After step (C), lining the welded joint member and the inner wall of the pipe connected to the joint member, and attaching a thermoplastic resin outer film to the inner surface of the pipe and the inner wall surface of the joint member via the intermediate layer and inner film; and E) After step (D), lining the inside of the pipe, then heating the heating wire embedded in the joint member to line the outer film and intermediate layer provided on the inner wall surface of the joint member.

[0017] The invention according to claim 8 relates to the pipe construction method according to claim 7, wherein the intermediate layer is formed of one or more selected from the group consisting of glass fibers and synthetic resin compositions.

[0018] The invention according to claim 9 relates to the pipe construction method according to claim 7, wherein the grout layer covering the wall surface of the manhole contains at least mortar.

[0019] The invention according to claim 10 relates to the pipe construction method according to claim 7, wherein the liner contains a polyethylene-based resin as a main component.

Effects of the Invention

[0020] According to the joint member of claim 1, the joint member is used for a connecting structure between a manhole for pipes and a pipe opening at an end of a pipe, and includes: a sleeve-shaped portion formed to match the inner diameter of the pipe; and a flange-shaped portion provided on an outer circumference of the sleeve-shaped portion, the flange-shaped portion having a shape adapted to a wall surface of the manhole, covering not only the pipe opening but also the periphery of the pipe opening, and being capable of being integrated with the manhole by heat welding using a heating wire. For this reason, the joint member according to claim 1 achieves the operational effect of being capable of forming a pipe joint that can be easily attached to the pipe opening of a pipe while preventing intrusion of water over a wide range and ensuring high water stopping performance.

[0021] According to the joint member of claim 2, since the joint member contains a polyethylene-based resin as a main component, the operational effect of being capable of forming a pipe connecting structure excellent in chemical resistance and wear resistance is achieved.

[0022] According to the pipe joint structure of claim 3, the joint structure is a joint structure for connecting a manhole for pipes and a pipe opening at an end of a pipe, wherein the joint member according to claim 1 or 2 is used; the joint structure comprises a grout layer covering a wall surface of the manhole, a liner covering a surface of the grout layer, and the joint member provided for use in the joint structure; and a multilayer structure including an outer thermoplastic resin film, an intermediate layer and an inner film is formed from the surface side on an inner surface of the pipe and an inner wall surface of the joint member, one surface of the intermediate layer is covered by the outer film, and the other surface of the intermediate layer is covered by the inner film. In the pipe joint structure which is a feature of the present invention, the outer film on the outer side and the liner covering the surface of the grout layer are heated, welded and integrated by a joint member with a heating wire embedded therein, so that water intrusion from the pipe opening can be reliably prevented, and there is no risk of water leakage. Therefore, the joint structure according to claim 3 achieves the functional effect of being capable of forming a pipe joint structure having excellent water stopping performance at the pipe opening of the pipe.

[0023] According to the pipe joint structure of claim 4, the intermediate layer is made of one or more selected from the group consisting of glass fibers and synthetic resin compositions, so that more excellent performance and high water resistance over a long period of time can be maintained, thereby achieving the functional effect of being capable of forming an intermediate layer having high water stopping performance and durability on the inner peripheral surface of the pipe.

[0024] According to the pipe joint structure of claim 5, the grout layer is characterized by comprising at least mortar, so that excellent load bearing performance and pressure resistance can be maintained. Therefore, the grout achieves the functional effect of being capable of forming a pipe joint structure having excellent load bearing capacity.

[0025] According to the pipe joint structure of claim 6, the liner covering the surface of the grout layer is characterized by comprising a polyethylene-based resin as a main component, thereby achieving the functional effect of being capable of forming a pipe joint structure excellent in wear resistance (about 30 times that of a versatile vinyl chloride resin) and chemical resistance.

[0026] According to the pipe joint structure of claim 6, the lining material is characterized by containing polyethylene resin as its main component, and therefore can maintain excellent elongation performance and high water resistance over a long period of time. Therefore, the lining material has the effect of forming a pipe joint structure with excellent watertightness and durability at the pipe opening of the pipe.

[0027] According to the pipe construction method of claim 7, the pipe construction method comprises: (A) a step of covering the wall surface of the manhole with an injection material layer; (B) a step of covering the injection material layer with a liner after step (A); (C) a step of heating and welding the liner and the joint member to the joint member by applying power from an external power source to an electric heating wire embedded in the joint member; and (D) a step of lining the welded joint member and the inner wall of the pipe connected to the joint member after step (C). In addition, the process includes (E) a step of attaching a thermoplastic resin outer film to the inner surface of the conduit and the inner wall surface of the joint member via the intermediate layer and inner film, and (D) a step of lining the inside of the conduit after step (D), and then heating an electric heating wire embedded in the joint member to line the outer film and intermediate layer provided on the inner wall surface of the joint member, thereby forming a conduit joint structure with excellent chemical resistance and abrasion resistance. Therefore, these processes have the effect of forming a pipe joint structure with excellent watertightness at the pipe opening.

[0028] According to the pipe construction method of claim 8, since the intermediate layer is made up of one or more selected from the group consisting of glass fibers and synthetic resin compositions, it has the effect of providing superior performance and maintaining high water resistance over a long period of time. Therefore, the pipe construction method of the present invention can form an intermediate layer on the inner surface of the pipe that has high watertightness and durability.

[0029] The pipe construction method according to claim 9 is characterized in that the injection material layer contains at least mortar, thereby providing the effect of maintaining excellent load-bearing capacity and pressure resistance.

[0030] The pipe construction method according to claim 10 is characterized in that the liner covering the surface of the injection material layer contains polyethylene resin as its main component, thereby providing the effect of forming a pipe joint structure with excellent chemical resistance and abrasion resistance. [Brief explanation of the drawing]

[0031] [Figure 1a] This is a perspective view showing the joint component. [Figure 1b] This is a plan view of the joint member as seen from the side that contacts the wall of the manhole. [Figure 1c] This is a cross-sectional view of the joint member. [Figure 2] This figure shows 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. For the sake of ease of understanding, the shape of the joint member is simplified in Figure 2 and subsequent figures. [Figure 3a] This figure shows the state before the removal of the sewage manhole in the pipe construction method according to the present invention, in the step of removing the sewage manhole from the pipe. [Figure 3b] This figure shows the state after the removal of the sewage manhole in the pipe, in one embodiment of the pipe construction method according to the present invention. [Figure 4] This figure shows one embodiment of the pipe construction method according to the present invention, in which the wall surface of a manhole is covered with an injection material layer, and then the injection material layer is covered with a liner. [Figure 5] This figure shows an embodiment of the pipe construction method according to the present invention, in which the heating wire of the joint member is heated and welded to the liner and joint by applying power from an external power source. [Figure 6]This is a perspective view showing a multilayer structure of a pipe in one embodiment of the pipe construction method according to the present invention, including an outer film, an intermediate layer, and an inner film made of thermoplastic resin. [Figure 7] This figure shows an embodiment of the pipe construction method according to the present invention, in which the inside of the pipe is lined, and then an electric heating wire embedded in the joint member is heated to weld the outer film and intermediate layer provided on the inner wall surface of the joint member. [Modes for carrying out the invention]

[0032] The following describes in detail, with reference to the attached drawings, the joint member, pipe connection structure, and pipe construction method for preventing water infiltration into the pipe opening according to the present invention.

[0033] Here, the conduit (10) is exemplified as the main pipe of a sewer pipeline, but it is not limited to this. The conduit joint member, conduit connection structure, and conduit construction method of the present invention can also be applied to, for example, industrial water pipelines, agricultural water pipelines, etc. Furthermore, while concrete pipes, ceramic pipes, polyvinyl chloride pipes, etc., can be used as the material for the conduit, it is not limited to any particular material.

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

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

[0036] <Pipe joint member for the connection between a manhole for a pipe and the end of a pipe> Figure 1a is a perspective view showing a joint member with an embedded heating wire, which is one embodiment of the present invention. One embodiment of the present invention, a joint member (2) in which a heating wire (6) is embedded, comprises a sleeve-shaped portion (8) formed to match the inner diameter of the pipe, as shown in Figure 1a, and a flange-shaped portion (7) on the outer circumference of the sleeve-shaped portion (8), the flange-shaped portion (7) having a curved surface that conforms to the wall surface of the manhole, and this joint member (2) has a pipe joint member whose main component is a polyethylene resin. The composition contained in the polyethylene resin is as described above.

[0037] In another embodiment of the present invention, the flange-shaped portion has a flat shape.

[0038] In this specification, "main component" refers to a component that is present in an amount of 50% or more by mass relative to the total mass.

[0039] The polyethylene resin content of 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 polyethylene resin content of the joint member (2) can also be 100% by mass.

[0040] The inner diameter of the pipe may be, for example, 200mm, 250mm, 300mm, 350mm, 400mm, 450mm, 500mm, 550mm, or 600mm, 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 perforation due to melting in the sleeve-shaped portion when heat welding is performed with a heating wire. If it is more than 30 mm, the weight will increase, which may require an extra step to support the joint member (2) during construction.

[0042] The thickness of the flange-shaped portion (7) is preferably 10mm to 30mm, but is not limited to this. If it is less than 10mm, there is a risk of perforation due to melting in the flange-shaped portion when heat welding is performed with an electric heating wire. If it exceeds 30mm, the weight will increase, which may require an extra step to support the joint member (2) during construction.

[0043] Figure 1b is a plan view of a joint member with an embedded heating wire, which is one embodiment of the present invention, as seen from the side in contact with the wall of a manhole. A joint member (2) according to one embodiment of the present invention has a curved surface that conforms to the curved wall surface of a manhole.

[0044] Figure 1c is a cross-sectional view taken from above the manhole when a joint member, which is one embodiment of the present invention, is used in a pipe opening connection structure.

[0045] As shown in Figure 1c, the joint member (2), which is one embodiment of the present invention, is a hollow, disc-shaped member having a curved surface on the side that contacts the wall surface of the manhole. The joint member (2) does not have a central part, but in cross-sectional view it is formed in the shape of a plano-convex lens, including an imaginary part. In cross-sectional view the imaginary apex of the curve of the joint member (2) is on the opposite side of the sleeve-shaped part (8), and the curve arcs toward the sleeve-shaped part (8).

[0046] In another embodiment of the present invention, the joint member has a flat shape that fits into the wall surface of a flat manhole.

[0047] The manholes using the joint member (2) are, for example, manholes No. 1, No. 2, and No. 3, but are not limited to these. The joint member may also be used in special manholes having a flat inner wall.

[0048] In one embodiment of the present invention, the inner diameter of the manhole that can accommodate the curved surface of the joint member (2) is, for example, Φ900mm, Φ1800mm, or Φ3600mm, but is not limited to these.

[0049] A joint member (2) according to one embodiment of the present invention may have a barcode for information management attached to it. The barcode may contain information such as the voltage and energizing time required for heat welding for each joint member.

[0050] As used in this specification, "barcode" includes one-dimensional codes and two-dimensional codes.

[0051] <Manhole for pipes and pipe connection structure at the end of the pipe> Figure 2 shows the process and structure of applying an outer film to the inner surface of the pipe and the cross-sectional portion of the inner surface of the joint member in one embodiment of the pipe construction method according to the present invention. An embodiment of the present invention relates to a pipe joint structure for a manhole and a pipe, the pipe joint structure 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 member (2) provided at the joint, the joint member (2) having an embedded heating wire (6); an input terminal (11) for an external power supply of the heating wire (6); and a multilayer structure comprising, from the outside, an outer film (5), an intermediate layer (12), and an inner film (13) of thermoplastic resin on the inner surface of the pipe (10) and the inner wall surface of the joint member (2), wherein 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), the pipe joint structure having an intermediate layer (12).

[0052] The content of mortar and other compositions in the mortar composition of the injection material layer (3) is not particularly limited, but 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 each time depending on the structure of the manhole.

[0053] The outer film (5) is made of a thermoplastic resin. Examples of thermoplastic resins that can be used include ABS resin, polyethylene, polystyrene, polypropylene, vinyl chloride resin, polyethylene terephthalate, polycarbonate, polybutylene terephthalate, polyacetal, polyimide, polyphenylene sulfide, and liquid crystal polymer. The outer film (5) is desirably adjusted to have a thickness of 0.8 mm. When the thickness of the outer film (5) is small, the adhesion to the pipe conduit (10) and the joint element (2) increases, and the possibility of interlayer separation decreases. When the thickness increases, the strength increases, but the overall thickness after liner application increases, which reduces the inner diameter of the repaired pipe conduit (10) and decreases the flow capacity inside the pipe. For this reason, in order to obtain a pipe conduit that prevents interlayer separation, has high strength, and secures the inner diameter of the pipe conduit as large as possible, it is essential to make the outer film (5) thin.

[0054] As shown in Fig. 6, the intermediate layer (12) consists of a member selected from the group consisting of glass fibers and synthetic resin compositions. For example, AR glass fibers, C glass fibers, E glass fibers, ECR glass fibers, etc. can be used as the glass fibers, and the synthetic resin composition is selected from unsaturated polyester resins, vinyl ester resins, and the like.

[0055] Figs. 3 to 5 and Fig. 7 are diagrams illustrating, step by step, a pipe conduit construction method for constructing a manhole for a pipe conduit and a pipe conduit coupling structure at an end of the pipe conduit according to an embodiment of the present invention.

[0056] Fig. 3 is a diagram showing the step of removing a sewage basin (9) provided in a pipe conduit (10) in an embodiment of the construction method of the present invention. The aged sewage basin (9) provided in the pipe conduit (10) is removed to prevent water infiltration.

[0057] <PML construction method> Fig. 4 is a diagram showing the step of, after covering the wall surface of the manhole with an injection material layer, covering the injection material with a liner in an embodiment of the pipe conduit construction method according to the present invention. The wall surface of the manhole (1) is covered with an injection material to form an injection material layer (3), and then the injection material layer (3) is covered with a liner (4). When forming the injection material (3), formwork may be installed between the manhole (1) and the liner (4) to fix the shape of the injection material layer (3). The liner may also be provided with V-shaped anchors on the side covering the injection material layer (3), and these V-shaped anchors improve the load-bearing capacity of the injection material layer (3). Furthermore, by providing these V-shaped anchors, the adhesion between the injection material layer (3) and the liner (4) is improved, preventing water from seeping in.

[0058] Figure 5 shows an embodiment of the pipe construction method according to the present invention, in which the heating wire of the joint member is heated and welded to the liner and joint by applying power from an external power source. The joint member (2) is connected to the pipe joint by heating and welding the joint member (2) to the liner (4) by applying power from an external power input terminal (11) to the heating wire (6) embedded in the joint member (2). This method is called the PML method. Any external power input terminal (11) that can be used by a person skilled in the art can be used as long as power can be applied to the heating wire (6). Furthermore, it is desirable that the temperature of the heating wire (6) to which power is applied at 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 available to those skilled in the art can be used for temporary fastening. The joint member (2) is equipped with a flange-shaped portion (7) that conforms to the wall surface of the manhole (1), which facilitates the attachment of the joint member (2) to the liner (4) and the joint, and also ensures high water-sealing power and durability after heat welding.

[0059] <Manhole for pipes and pipe connection structure at the end of the pipe> Figure 7 shows an embodiment of the pipe construction method according to the present invention, in which the inside of the pipe is lined, and then a heating wire embedded in the joint member is heated to weld the outer film and intermediate layer provided on the inner wall surface of the joint member. The 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 allows for a strong welding of the pipe (10) and the joint member (2), preventing water from seeping in from the pipe opening. The flash lining-S method is preferred as a construction method for lining the inside of a pipe.

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

[0061] Although not shown in the diagram, by removing the inner film (13) that covers the inner walls of the pipe (10) and 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 through welding with an electric heating wire, a pipe joint structure with excellent watertightness can be formed at the pipe opening of the pipe.

[0062] The pipe construction method of the present invention may include the steps of providing a joint member (2) for a connecting pipe, in which an electric heating wire (6) is embedded in the connecting pipe portion, in order to install a connecting pipe by excavating the pipe after the construction of the flash lining-S method, and welding the joint member (2) and the outer film (5). [Examples]

[0063] The effects of the present invention will be made clearer by illustrating examples of the pipe joint member, pipe connection structure, and pipe construction method of the present invention below. However, the present invention is not limited in any way to the following examples.

[0064] External pressure tests have demonstrated that manholes formed by the pipe construction method of the present invention have a load-bearing capacity exceeding the standard value of JSWAS A-11 "Sewerage Reinforced Concrete Assembled Manholes". The specifications for JSWAS A-11 "Sewerage Reinforced Concrete Assembled Manholes" are as follows: (1) Axial compressive strength of 150kN or more (2) Lateral bending strength of 6.9 kN / m (6.21 kN / 0.9 m) or more for cracking and 10.4 kN / m (9.36 kN / 0.9 m) or more for fracture. To confirm these physical strengths, various resistance tests were conducted using test specimens.

[0065] The tests were conducted in the following test areas. Table 1 below compares the physical strength of a test specimen produced using the PML method, which is one embodiment of the pipe joint member, pipe connection structure, and pipe construction method of the present invention, between a test section in which the wall thickness of the test specimen was reduced by 20 mm compared to a conventional product, and a test specimen in which the wall thickness of the test specimen was reduced by 20 mm.

[0066] [Table 1]

[0067] The test results showed that the PML method, one embodiment of the pipe construction method for forming the pipe joint structure of the present invention, has a load-bearing capacity in the manhole after construction that exceeds the standard values ​​of JSWAS A-11 "Sewerage Reinforced Concrete Assembled Manhole" in terms of pressure resistance and bending strength. (1) Axial compressive strength of 150kN or more (2) It was found to have excellent strength, with a lateral bending strength of 6.9 kN / m (6.21 kN / 0.9 m) for cracking and 10.4 kN / m (9.36 kN / 0.9 m) for fracture.

[0068] Furthermore, the tests revealed that the excellent adhesion between the liner and the injection material layer improved load-bearing capacity and allowed for more effective prevention of water infiltration.

[0069] Test results showed that the pipe connection structure of the present invention has durability and chemical resistance equivalent to or better than that of reinforced plastic composite pipes for sewage systems (JSWAS K-2).

[0070] Impact resistance tests and watertightness tests were conducted to confirm the bonding strength and adhesion between the lining material joint of the joint member and the lining material. The tests were performed using a lining material and joint member mainly composed of polyethylene resin, which is one embodiment of the present invention.

[0071] <Impact Resistance Test> The lining material joint of the joint member was struck with a hammer. As a result, no delamination due to the impact was observed.

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

[0073] The joint member, pipe connection structure, and pipe construction method according to the present invention are applicable to a wide range of pipe types, from sewer pipes to water supply pipes, industrial water pipelines, and agricultural water pipelines. Furthermore, the pipe construction method according to the present invention can form a pipe connection structure that prevents water from seeping into the pipe opening. Therefore, it is possible to provide an optimal joint member, pipe connection structure, and pipe construction method for preventing water from seeping into the pipe opening and for rehabilitation of existing pipes. [Explanation of symbols]

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

Claims

1. A joint member used in the connection structure between a manhole for a conduit and the pipe opening at the end of the conduit, A sleeve-shaped portion formed to match the inner diameter of the aforementioned pipe, The sleeve-shaped portion is provided with a flange-shaped portion on its outer circumference, The flange-shaped portion has a shape that conforms to the wall surface of the manhole, A heating element is embedded in the sleeve-shaped portion and the flange-shaped portion. The heating element is equipped with an input terminal for an external power supply. A joint member characterized by the following.

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

3. A jointing structure for a manhole for a conduit and a pipe opening at the end of a conduit, wherein the jointing member described in claim 1 or 2 is used, A layer of injection material 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 aforementioned coupling structure, A multilayer structure is formed on the inner surface of the pipe and the inner wall surface of the joint member, including a thermoplastic resin outer film, intermediate layer, and inner film, from the surface side. One side of the intermediate layer is covered by the outer film, The inner film is covered by the other surface of the intermediate layer, A bonding structure characterized by the following features.

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

5. The bonding structure according to claim 3, characterized in that the injection material layer includes at least mortar.

6. The bonding structure according to claim 3, characterized in that the liner contains a polyethylene resin as its main component.

7. A pipe construction method for constructing the joint structure described in claim 3, The aforementioned bonding structure is A layer of injection material covering the wall surface of the manhole, A liner covering the surface of the injection material layer, The joint member provided in the aforementioned coupling structure, The inner surface of the pipe and the inner surface of the joint member are configured with a multilayer structure including a thermoplastic resin outer film, intermediate layer, and inner film, from the surface side. One side of the intermediate layer is covered by the outer film, The inner film is covered by the other surface of the intermediate layer, The aforementioned pipe construction method, (A) A step of covering the wall surface of the manhole with an injection material layer, (B) After step (A), a step of covering the injection material layer with a liner, (C) After step (B) above, the process of heating and welding the liner and the joint member by applying power from an external power source to the heating wire embedded in the joint member, (D) After step (C) above, the welded joint member and the inner wall of the pipe connected to the joint member are lined, and the outer film of thermoplastic resin is attached to the inner surface of the pipe and the inner wall surface of the joint member via the intermediate layer and inner film, (E) A pipe construction method comprising the steps of: (E) After step (D) above, lining the inside of the pipe of the pipe, then heating the electric heating wire embedded in the joint member, and lining the outer film and intermediate layer provided on the inner wall surface of the joint member.

8. The pipe construction method according to claim 7, wherein the intermediate layer consists of one or more selected from the group consisting of glass fibers and synthetic resin compositions.

9. The injection material layer covering the wall surface of the manhole is characterized by containing at least mortar. The pipe construction method according to claim 7.

10. The pipe construction method according to claim 7, characterized in that the liner contains a polyethylene resin as its main component.

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