Drain manifold and method for manufacturing drain manifold

Abstract

To reliably verify bonding states in a drain manifold, which consists of multiple resin components bonded together and is shipped from a manufacturing plant.SOLUTION: A drain manifold 100 comprises an upper pipe 140, a lower pipe 110, an upper pipe receiving member 144 and a lateral branch pipe receiving member 146 that are made of a resin through injection molding and bonded together at bonding sections. For the drain manifold 100, regarding a bonding state of the bonding section between the upper pipe 140 and the lower pipe 110, a bonding state of the bonding section between an upper pipe connection 143 and the upper pipe receiving member 144, and a bonding state of the bonding section between a lateral branch pipe connection 142 and the lateral branch pipe receiving member 146, the bonding states can be verified by the absence of any voltage drop caused by arc discharge even when a high voltage is applied between two electrodes, one of which is a metallic electrode 320 to be brought close to or into contact with one of the bonding sections, and the other of which is a submerged electrode 321 to be brought into contact with water stored inside the drain manifold.SELECTED DRAWING: Figure 6

Description

[Technical field]

[0001] The present invention relates to a plastic drainage collector pipe that is placed in a through hole in the floor slab of a building, the drainage collector pipe including an upper pipe that protrudes above the floor slab and a lower pipe that is bonded below the upper pipe, the upper pipe including an upper pipe connection portion that connects the upper pipe through which wastewater flows in from the upper floor and at least one horizontal branch pipe connection portion that connects a horizontal branch pipe above the floor slab, and the lower pipe including a lower pipe connection portion that connects a lower pipe through which wastewater flows out to the lower floor.In particular, the present invention relates to a drainage collector pipe that allows the bonding condition (good connection state without water leakage) of the bonding portion between the upper pipe and the lower pipe, and the bonding portion between the upper pipe connection portion and the horizontal branch pipe connection portion and a plastic receiving member to be quickly, easily and reliably confirmed (inspected) (confirmed within a specified day from the date of manufacture), and further relates to a drainage collector pipe that allows the bonding condition (good connection state without water leakage) of the bonding portion to be quickly, easily and reliably confirmed (inspected) (confirmed within a specified day from the date of manufacture) even for a drainage collector pipe whose bonding length is short to make the drainage collector pipe more compact than the DV joint. In addition to such a drainage collecting pipe (itself), the present invention also includes a manufacturing method for the drainage collecting pipe. Here, the term "(itself)" is used to clearly distinguish between a drainage collecting pipe manufactured by a specific manufacturing method and a drainage collecting pipe that satisfies a specific inspection method, and means the drainage collecting pipe itself (not specified by these methods). Furthermore, a drainage collecting pipe at the time of shipment from a drainage collecting pipe manufacturing factory is made up of multiple members joined together, but since only those joined together by adhesive are the subject of the present invention, in the following description, there is no distinction between "bonding" and "adhesive joining". [Background technology]

[0002] Water supply and drainage facilities are installed in apartment buildings, office buildings, etc. Of these, the most widely known drainage facilities are those with a drainage piping structure that includes vertical pipes (standpipe, upper standpipe, lower standpipe, upper pipe, lower pipe) that run vertically through each floor of the building, horizontal pipes (horizontal branch pipes, branch pipes) installed on each floor, and a drainage collector pipe (also called a drainage pipe joint, drainage pipe joint, or drainage collector joint) that connects them.

[0003] When installed in a building, such a drainage collecting pipe comprises an upper pipe (main body, pipe body) that is placed in the through hole of the floor slab and a lower pipe that is bonded below the upper pipe, and the upper pipe has an upper pipe connection part at its upper end that can be connected to the upper pipe (upper standpipe) on the upstream side (upper floor side) and a horizontal branch pipe connection part on its side that can be connected to the horizontal branch pipe, and the lower pipe (if not for the lowest floor) has a swirl vane and a lower pipe connection part that connects a lower pipe (lower standpipe) that drains wastewater to the lower floor, or (if for the lowest floor) has a reduced diameter part and a lower pipe connection part that connects (directly or via a separate pipe) a foot vent pipe that drains wastewater to the horizontal main pipe. Also, drainage collecting pipes made of one or more injection molded resins (typically made of rigid polyvinyl chloride (PVC)) are widely known.

[0004] Such a plastic drainage collecting pipe is shipped after the upper pipe and lower pipe, which are separately injection molded, are adhesively joined at the drainage collecting pipe manufacturing factory, and a plastic receiving member is adhesively joined to the upper pipe connection part and the side branch pipe connection part of the upper pipe. Then, at the construction site, the side branch pipe or the upstream side (upper layer side) upper pipe (upper standpipe) is connected via a receiving member equipped with a rubber ring (rubber packing) or the like. The drainage collecting pipe manufactured in this way at the manufacturing factory and constructed on site is subjected to a quality inspection of the adhesive joints (to ensure that they are securely adhesively joined and there are no water leaks) at the manufacturing factory before shipping.

[0005] Usually, inspection of adhesive joints in resin pipes is carried out using water pressure or air pressure. For example, Japanese Patent No. 4312032 (Patent Document 1) (although not a drainage manifold) discloses a synthetic resin The present invention discloses a water pressure inspection method for a flexible pipe, which is performed at the time of completion of construction of the flexible pipe to inspect the presence or absence of water leakage in the pipe. The inspection method is a water pressure inspection method for a pipe that is made of a flexible pipe and includes a valve, and includes the following steps: (a) sealing the pipeline, supplying water into the pipeline, applying a first water pressure to the pipeline that is equal to or lower than the operating pressure of the valve, and then leaving the pipeline for a first hour; (b) reloading the pipeline to the first water pressure; (c) Immediately thereafter, reduce the pressure to the second water pressure. (d) measuring the first measured water pressure, which is the water pressure in the pipeline two hours after the second water pressure is reached; (e) when the first measured water pressure is less than a first reference water pressure, it is determined that there is a water leak in the pipeline, and when the first measured water pressure is equal to or greater than a second reference water pressure, it is determined that there is no water leak in the pipeline; (f) when the first measured water pressure is equal to or greater than the first standard water pressure and less than the second standard water pressure, measure a second measured water pressure, which is the water pressure in the pipeline after three hours; (g) when the second measured water pressure is less than a third reference water pressure, it is determined that there is a water leak in the pipeline, and when the second measured water pressure is equal to or greater than the third reference water pressure, it is determined that there is no water leak in the pipeline. It is characterized by: [Prior art documents] [Patent documents]

[0006] [Patent Document 1] Patent No. 4312032 Summary of the Invention [Problem to be solved by the invention]

[0007] According to the inspection method disclosed in Patent Document 1, since the inspection can be performed at a pressure equal to or lower than the valve's operating pressure standard, leak inspection can be performed regardless of the type of pipeline, and by preloading the pipeline with a water pressure higher than the inspection water pressure, erroneous judgments can be prevented and highly accurate leak inspection can be performed, and furthermore, since even minute leaks can be detected by leaving it for a certain period of time, the method has been highly evaluated for its ability to improve the accuracy of leak inspection. However, since the inspection method disclosed in Patent Document 1 detects even minute leaks by leaving it for a certain period of time, the cycle time for leak inspection is lengthened because the water pressure is detected during the repeated pressurization, leaving it, re-pressurization, and depressurization.

[0008] As an example of an alternative to such a leak inspection method using water pressure detection, there is a method of submerging a pipe fitting (an example of a workpiece to be inspected) in water and pressurizing it with a pump or the like, or a method of applying a leak detection liquid to a pipe fitting in the atmosphere and pressurizing it with a pump or the like. In such cases, the presence or absence of a leak is judged by an operator (inspector) by visually checking for water droplets or air bubbles. However, depending on the operator, it is not possible to completely eliminate the possibility that the operator may not be able to judge whether the bubble is from the pipe fitting or attached to a jig or equipment, and may overlook it, and there is also a possibility that uniform inspection results may not be obtained due to differences in operator experience. Furthermore, as in Patent Document 1, the problem of a long cycle time remains because water or air needs to be stored in the pipe fitting.

[0009] Furthermore, in the case of drainage collecting pipes, the adhesive joints are designed to be shallow (shorter in the axial direction) (compared to general PVC joints, etc.) so that the product dimensions of the drainage collecting pipes are compact. If the adhesive joints in the axial direction are shallow, the reliability of the adhesive joints is relatively low, so the importance of leak inspection of adhesive joints tends to increase especially in drainage collecting pipes. More specifically, in conventional general DV joints, the adhesive length in the axial direction of the pipe (shown in Figure 4) becomes longer (deeper) as the nominal diameter increases from 40 (outer diameter of the spigot φ48 shown in Figure 4), to 50 (φ60), to 65 (φ76), to 75 (φ89), to 100 (φ114), to 125 (φ140), to 150 (φ165). Thus, in DV fittings, the ratio of the bonded length to the outer diameter of the spigot is 42% or more. Meanwhile, the length of the joint (bonded part) of the drainage collecting pipe (= bonded length in the pipe axis direction) is designed to be short (shallow), for example, with bonded lengths (depths) in the pipe axis direction of 20 mm, 20 mm, and 30 mm, even for outer diameters of φ104, φ114, and φ150, respectively, so that the product dimensions of the drainage collecting pipe are compact. In drainage collecting pipes, the ratio of the bonded length to the outer diameter of the spigot is 40% or less. For this reason, compared to general DV fittings, the importance of leak inspections (leak inspections from bonded joints) before the product is shipped at the drainage collecting pipe manufacturing plant is increasing.

[0010] The present invention was developed in consideration of the above-mentioned problems, and its object is to provide a drainage collector pipe made of resin to be placed in a through hole in the floor slab of a building, in which the bonding condition at the bonded joints between the separately injection molded upper pipe and lower pipe, and between the upper pipe connection part and the horizontal branch pipe connection part and the resin receiving member can be quickly, easily and reliably confirmed (inspected) (confirmed within a specified day from the date of manufacture), and a method for manufacturing a drainage collector pipe, in which the bonding condition at the bonded joints can be quickly, easily and reliably confirmed (inspected) (confirmed within a specified day from the date of manufacture), even in the case of a drainage collector pipe with a short bonded length relative to the DV joint. [Means for solving the problem]

[0011] In order to achieve the above object, the drainage collecting pipe and the manufacturing method thereof according to the present invention employ the following technical measures.

[0012] A drainage collecting pipe according to one aspect of the present invention is a resin drainage collecting pipe that is placed in a through hole in a floor slab of a building, the drainage collecting pipe including an upper pipe that protrudes above the floor slab and a lower pipe that is bonded below the upper pipe, the upper pipe including an upper pipe connection portion that connects an upper pipe through which drainage water flows in from an upper floor and at least one horizontal branch pipe connection portion that connects a horizontal branch pipe above the floor slab, the lower pipe including a lower pipe connection portion that connects a lower pipe through which drainage water flows out to a lower floor, and a resin receiving member is bonded to each of the upper pipe connection portion and the horizontal branch pipe connection portion, and the receiving member is closed as necessary. Then, water is stored inside the drainage collecting pipe, and the bonding condition at the bonding part between the upper pipe and the lower pipe, the bonding condition at the bonding part between the upper pipe connection part and the receiving member, and the bonding condition at the bonding part between the horizontal branch pipe connection part and the receiving member are confirmed by using one electrode as a metal electrode that is brought close to or into contact with one of the bonding parts and the other electrode in contact with the water stored inside the drainage collecting pipe, and applying a high voltage between the two electrodes to confirm that there is no voltage drop between the two electrodes due to the occurrence of an arc discharge.

[0013] In order to achieve the above object, a drainage collecting pipe according to another aspect of the present invention is a resin drainage collecting pipe that is placed in a through hole in a floor slab of a building, the drainage collecting pipe including an upper pipe that protrudes above the floor slab and a lower pipe bonded below the upper pipe, the upper pipe including an upper pipe connection portion that connects an upper pipe through which drainage water flows in from an upper floor and at least one horizontal branch pipe connection portion that connects a horizontal branch pipe above the floor slab, the lower pipe including a lower pipe connection portion that connects a lower pipe through which drainage water flows out to a lower floor, a resin receiving member is bonded to each of the upper pipe connection portion and the horizontal branch pipe connection portion, and the drainage collecting pipe is supported by a support member that is capable of supplying water to the inside of the drainage collecting pipe, discharging water from the inside of the drainage collecting pipe, and storing water therein, the support member having an electrode that can come into contact with the water stored therein, The drainage collecting pipe is supported with the axis of the collecting pipe approximately vertical, with the upper pipe facing up and the lower pipe facing down, and the receiving member attached to the horizontal branch pipe connection portion is blocked and water is stored inside the drainage collecting pipe via the support member, and the bonding condition at the bonding portion between the upper pipe and the lower pipe, the bonding condition at the bonding portion between the upper pipe connection portion and the receiving member, and the bonding condition at the bonding portion between the horizontal branch pipe connection portion and the receiving member can be confirmed by using one electrode as a metal electrode that is brought close to or into contact with one of the bonding portions and the other electrode being in contact with the water stored inside the drainage collecting pipe, and applying a high voltage between the two electrodes to confirm that there is no voltage drop between the two electrodes due to the generation of an arc discharge.

[0014] Preferably, the shape of the metal electrode is a semicircular shape corresponding to the maximum outer diameter of the adhesive joint between the upper tube and the lower tube, the adhesive joint between the upper tube connection part and the receiving member, and the adhesive joint between the horizontal branch pipe connection part and the receiving member, and can be configured so as to be commonly used for the adhesive joints.

[0015] More preferably, the absence of a voltage drop between the two electrodes means that the voltage drop does not exceed 50% of the high voltage applied between the two electrodes.

[0016] More preferably, the high voltage may be 40 kV or more.

[0017] More preferably, the bonded length in the tube axis direction at the bonded portion may be 40 mm or less.

[0018] More preferably, the adhesive portion is formed by fitting a spigot having a small outer diameter into a receiving port having an inner diameter corresponding to the outer diameter of the spigot, and the adhesive length in the tube axis direction of the adhesive portion is the insertion length of the spigot, and the adhesive length can be configured so that the ratio of the adhesive length to the outer diameter of the spigot is 40% or less.

[0019] More preferably, the receiving member can be configured so that it is sealed with a rubber packing, and the area sealed with the rubber packing is excluded from the objects for checking the adhesion state.

[0020] More preferably, the adhesive can be configured such that the adhesive state of the adhesive portion of the drainage collecting pipe has been confirmed to be good within 30 days from the date of manufacture.

[0021] In order to achieve the above object, a manufacturing method for a drainage collecting pipe according to yet another aspect of the present invention is a manufacturing method for a resin drainage collecting pipe to be placed in a through hole of a floor slab of a building, the drainage collecting pipe including an upper pipe protruding above the floor slab and a lower pipe bonded below the upper pipe, the upper pipe in the drainage collecting pipe includes an upper pipe connection portion connecting an upper pipe through which drainage water flows in from an upper floor and at least one horizontal branch pipe connection portion connecting a horizontal branch pipe above the floor slab, the lower pipe includes a lower pipe connection portion connecting a lower pipe through which drainage water flows out to a lower floor, a resin receiving member is bonded to each of the upper pipe connection portion and the horizontal branch pipe connection portion, and the manufacturing method includes an adhesive portion between the upper pipe and the lower pipe, an adhesive portion between the upper pipe connection portion and the receiving member, and an adhesive portion between the horizontal branch pipe connection portion and the receiving member, and the manufacturing method is characterized in that the adhesive state at the adhesive portions is good. a resin preparation step of preparing a plurality of resin parts included in the drainage collecting pipe by resin molding, or by transporting and preparing the plurality of resin parts; an assembly step of assembling the drainage collecting pipe by joining the adhesive parts of the plurality of parts using an adhesive; and an inspection step of inspecting the adhesive state at the adhesive parts of the assembled drainage collecting pipe, the inspection step including a preparation step of preparing a power source and electrodes for applying a high voltage between two electrodes, one of which is an external metal electrode provided on the outside of the drainage collecting pipe and the other is an internal metal electrode provided inside the drainage collecting pipe; and an inspection step of inspecting the adhesive state at the adhesive parts of the assembled drainage collecting pipe, the inspection step including a preparation step of preparing a power source and electrodes for applying a high voltage between two electrodes, one of which is an external metal electrode provided on the outside of the drainage collecting pipe and the other is an internal metal electrode provided inside the drainage collecting pipe, and and a confirmation step of confirming that the adhesive state at the adhesive joint is good by not finding any defect.

[0022] Preferably, the confirmation step can be configured to confirm that the adhesive condition at the adhesive joint is good by observing that, when a high voltage of 40 kV or more is applied between the two electrodes, no voltage drop between the two electrodes due to the occurrence of arc discharge is observed and the voltage drop between the two electrodes does not exceed 50% of the high voltage applied between the two electrodes. Effect of the Invention

[0023] According to the present invention, it is possible to provide a drainage collector pipe made of resin to be placed in a through hole in the floor slab of a building, in which the bonding condition at the bonded joints between the separately injection molded upper pipe and lower pipe, and between the upper pipe connection part and the horizontal branch pipe connection part and the resin receiving member can be quickly, easily and reliably confirmed (inspected) (confirmed within a specified day from the date of manufacture), and a manufacturing method for the drainage collector pipe, in particular, in which the bonding condition at the bonded joints can be quickly, easily and reliably confirmed (inspected) (confirmed within a specified day from the date of manufacture), even in the case of a drainage collector pipe with a short bonded length relative to the DV joint. [Brief description of the drawings]

[0024] [Figure 1] FIG. 1 is a diagram showing a drainage piping structure in which a drainage collection pipe 100 according to an embodiment of the present invention is adopted, in which (A) is a perspective view showing a state in which the drainage collection pipe 100 has an outer layer member 150, and (B) is a perspective view showing a state in which the drainage collection pipe 100 does not have an outer layer member 150. [Diagram 2] FIG. 1 is a diagram showing a drainage collecting pipe 100 according to an embodiment of the present invention, in which (A) is a perspective view showing a state in which the heat-expandable fire-resistant material 116 is filled, and (B) is a perspective view showing a state in which the heat-expandable fire-resistant material 116 is not filled. [Diagram 3] FIG. 3A is an exploded view of the drainage collecting pipe 100 shown in FIG. 2B, and FIG. 3B is a perspective view of the lower pipe 110 seen through the pipe wall. [Figure 4] 1 is a diagram for explaining a bonding length in a drainage collecting pipe according to an embodiment of the present invention. FIG. [Diagram 5]FIG. 1 is a diagram (part 1) for explaining a method for inspecting a drainage manifold according to an embodiment of the present invention. [Figure 6] FIG. 2 is a diagram (part 2) for explaining the method for inspecting a drainage manifold according to an embodiment of the present invention. [Figure 7] FIG. 3 is a diagram (part 3) for explaining the method for inspecting a drainage manifold according to an embodiment of the present invention. [Figure 8] FIG. 4 is a diagram (part 4) for explaining the method for inspecting a drainage manifold according to an embodiment of the present invention. [Figure 9] 1A and 1B are diagrams for explaining a drainage collecting pipe 101 according to a modified example of an embodiment of the present invention, and diagrams for explaining an inspection method for the drainage collecting pipe 101. [Figure 10] FIG. 1 is a diagram (part 1) for explaining features of a drainage manifold (itself) according to an embodiment of the present invention. [Figure 11] FIG. 2 is a diagram (part 2) for explaining features of the drainage manifold (itself) according to the embodiment of the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0025] Hereinafter, a drainage collecting pipe 100 according to an embodiment of the present invention and a manufacturing method thereof, which includes an inspection step for ensuring that the bonding state at the bonding joints where multiple resin members constituting the drainage collecting pipe are bonded together, will be described in detail with reference to Figures 1 to 11.

[0026] Here, the drainage collecting pipe according to the present invention is a pipe that has a good adhesive state at the adhesive joint in the inspection described below. It is a drainage collecting pipe having a technical feature that can be confirmed (confirmed within a specified day from the date of manufacture) (the technical feature of the drainage collecting pipe itself is the goodness of the adhesive state of this adhesive part, and the goodness of the adhesive state of the adhesive part as a technical feature that water will not leak from the adhesive part after the drainage collecting pipe is installed in a building and starts to be used). That is, the greatest feature of the drainage collecting pipe according to the present invention is that the goodness of the adhesive state of each of the adhesive parts at the adhesive part between the upper pipe protruding above the floor slab and the lower pipe below it, the adhesive part between the upper pipe connection part and the receiving member, and the adhesive part between the horizontal branch pipe connection part and the receiving member are provided as technical features of the drainage collecting pipe itself by satisfying the <conditions> shown below. <Conditions> Water is stored inside the drainage collecting pipe via a support member, and the bonding state at the bonding part between the upper pipe and the lower pipe, the bonding state at the bonding part between the upper pipe connection part and the receiving member, and the bonding state at the bonding part between the horizontal branch pipe connection part and the receiving member are such that one electrode is a metal electrode that is brought close to or into contact with one of the bonding parts, and the other electrode is brought into contact with the water stored inside the drainage collecting pipe, and a high voltage is applied between the two electrodes, and no voltage drop occurs between the two electrodes due to the generation of an arc discharge.

[0027] Moreover, such a drainage collecting pipe is manufactured by a manufacturing method including a resin preparation step of preparing multiple resin parts to be included in the drainage collecting pipe by resin molding, or by transporting and preparing multiple resin parts, an assembly step of assembling the drainage collecting pipe by joining the multiple parts at their bonding parts using an adhesive, and an inspection step of inspecting the bonding condition at the bonding parts of the assembled drainage collecting pipe, and this inspection step includes a preparation step of preparing a power source and electrodes to apply a high voltage between two electrodes, one of which is an external metal electrode provided on the outside of the drainage collecting pipe and the other is an internal metal electrode provided inside the drainage collecting pipe, and a confirmation step of bringing the external metal electrode close to or into contact with one of the bonding parts and applying a high voltage between the two electrodes, so that it can be confirmed that the bonding condition at the bonding part is good by not observing any voltage drop between the two electrodes, which is the voltage drop caused by the occurrence of arc discharge. For this reason, the manufacturing method for a drainage collecting pipe according to the present invention is a manufacturing method that includes at least a resin preparation step, an assembly step, and an inspection step (including a preparation step and a verification step) (regardless of whether the inspection step is performed on all products, randomly inspected from products, or incorporated into a performance inspection of prototypes).In this way, the greatest feature of the manufacturing method for a drainage collecting pipe according to the present invention is that the goodness of the bonding state at each bonded joint is confirmed in the inspection step to satisfy the following: "In the verification step, even when a high voltage is applied between both electrodes, no voltage drop is observed between the two electrodes, which is the voltage drop caused by the occurrence of arc discharge.", thereby making this a technical feature of the drainage collecting pipe itself.

[0028] Preferably, the greatest feature of the manufacturing method for a drainage collecting pipe according to the present invention is that the goodness of the bonding condition at each bonding joint is confirmed in an inspection step to satisfy the following: "In the confirmation step, when a high voltage of 40 kV or more is applied between the two electrodes, a voltage drop caused by the occurrence of arc discharge is not observed and the voltage drop between the two electrodes does not exceed 50% of the high voltage applied between the two electrodes," thereby making this a technical feature of the drainage collecting pipe itself.

[0029] In the following description, the outer peripheral surface, the outer surface, and the outside, the outer layer side, the outer peripheral side, and the outside, the inner layer side, the inner peripheral side, and the inside, and the thermally expandable fireproof material, the fireproof material, and the thermally expandable material may not be clearly distinguished from each other. In addition, to facilitate understanding of the present invention, the directions of the horizontal branch pipes may be specified using the hour hands of a clock as 0 o'clock, 3 o'clock, 6 o'clock, and 9 o'clock (particularly in FIG. 7). In addition, the symbols (consisting of numbers and (if necessary) letters) attached to the dashed dotted lines in the drawings indicate the figure number with the numbers and the branch number (A, B, C, etc.) with the letters, and the drawings identified by the symbols are shown in enlarged views (particularly in FIG. 9).

[0030] Hereinafter, a drainage collecting pipe 100 according to an embodiment of the present invention will be described in detail with reference to the drawings. As shown in Figs. 1 to 3, the drainage piping structure using the drainage collecting pipe 100 includes a non-fireproof resin drainage collecting pipe 100 provided in a through hole that vertically penetrates a floor slab in a building, and a resin drainage standpipe (upper floor side drainage standpipe 220 (sometimes simply referred to as upper pipe 220) 220 that allows drainage water from the upper floor to flow in, and lower floor side drainage standpipe 230 (sometimes simply referred to as lower pipe 230) that allows drainage water to flow down to the lower floor) connected to the drainage collecting pipe 100. Here, "non-fireproof" refers to a property that can be deformed, melted, or burned by heat caused by a fire that occurs in a building, and for example, a resin-made one corresponds to this.

[0031] The drainage collector pipe 100 and the drainage riser pipe (upper floor drainage riser pipe 220 (upper pipe 220) and lower floor drainage riser pipe 230 (lower pipe 230)) are formed of, for example, polyvinyl chloride, polyethylene, polybutene, polypropylene, nylon, or the like. The drainage riser pipe may be, for example, a so-called fire-resistant two-layer pipe. As shown in FIG. 3(A), the drainage collector pipe 100 is formed of one or more resin injection moldings (here, as an example, six pieces: an upper pipe 140, a lower pipe 110, an upper pipe receiving member 144, and a horizontal branch pipe receiving member 146 × 3). As shown in FIG. 1 to FIG. 3, the drainage collector pipe 100 is a resin drainage collector pipe arranged in a through hole of the floor slab of a building, and includes an upper pipe 140 protruding above the floor slab and a lower pipe 110 bonded below the upper pipe 140. The upper pipe 140 includes an upper pipe connection part 143 to which an upper pipe receiving member 144 is attached for connecting an upper pipe 220 through which wastewater flows in from the upper floor, and at least one (three in this case) horizontal branch pipe connection part 142 to which a horizontal branch pipe receiving member 146 for connecting a horizontal branch pipe above the floor slab is attached. The lower pipe 110 includes a lower pipe connection part 130 that connects a lower pipe 230 through which wastewater flows out to the lower floor. Resin receiving members (more specifically, an upper pipe receiving member 144 and a horizontal branch pipe receiving member 146) are attached to the upper pipe connection part 143 and the horizontal branch pipe connection part 142, respectively.

[0032] Here, in the case where this drainage collecting pipe 100 is not for the lowest floor, as shown in Figures 3(A) and 3(B), as one example, a swirling vane 114 is formed above the lower pipe connection part 130 in the lower pipe 110 as a protrusion that protrudes from the inner surface of the lower pipe 110, and a recess 112 corresponding to this protrusion (here, the swirling vane 114) is formed on the outer surface of the lower pipe 110, and a heat-expandable fire-resistant material 116 is filled in this recess 112.

[0033] Here, although not limited thereto, the thermally expandable fireproof material 116 is formed in a putty-like form, and is filled into the depression 112 on the outer surface of the lower pipe 110 of the drainage collecting pipe 100 so as to be filled up to about the outer diameter of the lower pipe 110 (an amount sufficient to realize the desired fire resistance). Therefore, the outer diameter of the lower pipe 110 of the drainage collecting pipe 100 is about the same as that of a conventional drainage piping joint. In this way, as shown in FIG. 1(B), the thermally expandable fireproof material 116 itself (not resin-containing but pure) is filled into the portion of the depression 112 corresponding to the protruding portion (the swirl vane 114).

[0034] When such a drainage collecting pipe 100 is installed in a through hole that penetrates the floor slab in the building from top to bottom, as shown in Fig. 1 (A), the depression 112 of this protruding part (swirl vane 114) is formed so that at least a part of it corresponds to at least a part of the range from the upper end to the lower end of the floor slab when installed in the building. Note that this protruding part is not limited to the swirl vane 114 as long as it is a part that changes the flow of drainage in the drainage collecting pipe 100, but may be a deflector plate or the like, and is not limited to either the swirl vane or the deflector plate as long as it forms a corresponding depression 112 on the outer surface of the lower pipe 110.

[0035] Furthermore, it is preferable that an outer layer member 150 having fire resistance and vibration suppression properties is provided on the outer layer of the thermally expandable fireproof material 116 so as to be wrapped around the outer periphery of the lower pipe 110, This outer layer member 150 may cover the lower part of the upper pipe 140. As an example of this outer layer member 150, it has a three-layer structure, and is provided so as to cover the outer peripheral surface of the lower pipe 100, including the case where it covers the lower part of the upper pipe 140 of the drainage collecting pipe 100, in the order of a vibration-damping material, a vibration insulator formed of fire-resistant inorganic fiber, and a sound-insulating cover, from the outer surface of the drainage collecting pipe 100. As an example, the vibration-damping material of the innermost layer is formed containing a butyl-based (butyl rubber, etc.) or asphalt-based (rubber asphalt, modified asphalt, etc.) material, the sound-insulating cover of the outermost layer is formed containing a rubber-based (EPDM (ethylene propylene diene rubber) etc.), elastomer-based or resin-based material (it may be made of not only soft materials such as rubber but also hard PVC), and the vibration insulator formed of fire-resistant inorganic fiber of the middle layer is formed from an aggregate of inorganic fibers having fire resistance (glass wool, rock wool, ceramic fiber, etc.).

[0036] 3(A), the upper pipe 140 in this drainage collecting pipe 100 is composed of a water collection chamber (no reference number) equipped with an upper pipe connection section 143 that connects the upper pipe 220 via an upper pipe receiving member 144 and side branch pipe connection sections 142 that connect side branch pipes at three locations at 90° intervals in top view via side branch pipe receiving members 146, the upper pipe receiving member 144, and three side branch pipe receiving members 146. Here, although not limited thereto, the side branch pipe receiving member 146 may be one that connects a side branch pipe without reducing its diameter (the 0 o'clock branch shown in FIG. 7) or one that connects a side branch pipe with a reduced diameter (the 3 o'clock branch and the 6 o'clock branch shown in FIG. 7).

[0037] Moreover, the drainage collecting pipe 100 is formed from six resin injection-molded products shown in FIG. 3(A) in the manufacturing factory of the drainage collecting pipe 100, as described above, and the joints between these separate injection-molded products shown in FIG. 3(A) are bonded with an adhesive. The drainage collecting pipe 100 and the inspection method for the drainage collecting pipe according to the present embodiment are capable of quickly, easily, and reliably confirming (inspecting) the bonding conditions at the bonding parts, that is, the bonding part between the upper pipe 140 and the lower pipe 110, the bonding part between the upper pipe connecting part 143 and the upper pipe receiving part 144, and the bonding part between the side branch pipe connecting part 142 and the side branch pipe receiving part 146 (confirmed within a predetermined day from the date of manufacture) of the drainage collecting pipe and the inspection method thereof. For this reason, these bonding parts will be described in detail with reference to FIG. 3 and FIG. 4. Note that the alphabet M (male side) immediately following the number of the symbol in FIG. 3(A) means the spigot M shown in FIG. 4, and the alphabet F (female side) means the receiving part F shown in FIG. 4.

[0038] As shown in FIG. 4, in order to generally join and connect resin piping members with adhesive, the connection preparation shown in FIG. 4(A), the connection start shown in FIG. 4(B), and the connection completion shown in FIG. 4(C) are performed, and then the spigot M is inserted into the socket F until the end face of the spigot M abuts against the stopper of the socket F, and the members are bonded by the adhesive (which forms a lubricating layer) applied to the outer peripheral surface of the spigot M and the inner peripheral surface of the socket F. When bonded in this manner, the pipe axis direction is the direction shown in FIG. 4(A), and the bonding length in the pipe axis direction is, as shown in FIG. 4(C), the bonding length in the pipe axis direction = socket length L(1) = insertion length L(2). Thus, the bonding length is the pipe axis direction length of the piping members bonded to each other, and in the present invention, the bonding length in the direction of the outer peripheral surface or inner peripheral surface of the piping members is not taken into consideration, so in the present invention, even when simply described as bonding length, it refers to the bonding length in the pipe axis direction shown in FIG. 4.

[0039] The drainage collecting pipe and inspection method of the present invention focus on the fact that, in order to make the product dimensions of the drainage collecting pipe manufactured by bonding resin injection molded products compact, the bonding length (depth) in the pipe axial direction is designed to be 20 mm and 30 mm, respectively, which is shorter (shallower) than a general DV joint, even if the outer diameters of the bonded resin injection molded products are φ114 and φ150, and therefore, compared to a general DV joint, the importance of leak inspection (leak inspection from bonded joints) before product shipment at the drainage collecting pipe manufacturing plant is increasing.The present invention also focuses on the fact that the bonding condition of the bonded joints in this drainage collecting pipe can be quickly, easily, and reliably confirmed (inspected) (confirmed within a specified day from the date of manufacture). The purpose of this study is to

[0040] Returning to FIG. 3(A) and also referring to FIG. 4, the five adhesive joints of the drainage collecting pipe 100 according to this embodiment will be described. The adhesive portion between the upper pipe 140 and the lower pipe 110 is the portion where the lower insertion port 140MD provided at the lower end of the upper pipe 140 and the lower pipe receiving port 110F provided at the upper end of the lower pipe 110 are adhesively attached. More specifically, the adhesive portion is attached by inserting the lower insertion port 140MD into the lower pipe receiving port 110F as shown in FIG. 3(A) and FIG. 4. The adhesive portion between the upper pipe connection portion 143 and the upper pipe receiving member 144 is the portion where the upper insertion port 140MU of the upper pipe connection portion 143 provided at the upper end of the upper pipe 140 and the upper receiving port 144F of the upper pipe receiving member 144 are adhesively attached, and more specifically, the upper insertion port 140MU is inserted into the upper receiving port 144F and adhesively attached, as shown in Figures 3(A) and 4. The adhesive joints between the three horizontal branch pipe connecting parts 142 and the horizontal branch pipe receiving members 146 are the parts where the horizontal receiving ports 142F of the horizontal branch pipe connecting parts 142 provided at three positions on the side of the upper pipe 140 are adhesively joined to the spigots 146M of the horizontal branch pipe receiving members 146, and more specifically, the spigots 146M are inserted into the horizontal receiving ports 142F and adhesively joined as shown in Figures 3(A) and 4. As an example, the bonding length at the bonding portion between the upper pipe 140 and the lower pipe 110 (socket outer diameter 150 mm) is 30 mm, the bonding length at the bonding portion between the upper pipe connection portion 143 and the upper pipe socket member 144 (socket outer diameter 114 mm) is 20 mm, and the bonding length at the bonding portion between the side branch pipe connection portion 142 and the side branch pipe socket member 146 (socket outer diameter 104 mm) is 20 mm, and in the drainage collecting pipe 100 according to this embodiment, the ratio of the bonding length to the spigot outer diameter is 40% or less. For this reason, as described above, in a general DV joint, the ratio of the bonding length to the spigot outer diameter is 42% or more, whereas in the drainage collecting pipe 100, the bonding length is designed to be short so that the product dimensions of the drainage collecting pipe 100 are compact, and compared to a general DV joint, the importance of leakage inspection (leakage inspection from adhesive joints) before product shipment at the manufacturing plant of the drainage collecting pipe is increasing.

[0041] The tube axis direction in these five bonded portions is as shown in Fig. 3(A), and this tube axis direction coincides with the tube axis direction shown in Fig. 4(A). As described above, these five bonded portions are formed by fitting the spigot M having a small outer diameter onto the socket F having an inner diameter corresponding to the outer diameter of the spigot M (by inserting the spigot M into the horizontal socket 142F), and the bonded length in the tube axis direction is the socket length L(1) in the socket F = the insertion length L(2) in the spigot M, as shown in Fig. 4(C), and the ratio of the bonded length in the tube axis direction to the outer diameter of the spigot M (the spigot outer diameter shown in Fig. 4) is 40% or less, as an example, as described above.

[0042] Furthermore, in cases where the connection is not limited to the case where a small outer diameter socket M is fitted onto a socket F having an inner diameter corresponding to the outer diameter of the socket M (by inserting the socket M into the horizontal socket 142F), the connection length in the tube axis direction (the length over which the inserting side and the inserted side overlap in the tube axis direction, which may be, as an example, a length corresponding to the adhesive length shown in Figure 4(C) (socket length L(1) at socket F = insertion length L(2) at socket M) or a length corresponding to the tightening margin shown in Figure 4(B), and the length in the tube axis direction is 40 mm or less.

[0043] The present invention is directed to a drainage collecting pipe 100 in which a plurality of parts (including a receiving member) are joined at adhesive joints using an adhesive, and the drainage collecting pipe (itself) can be confirmed to have a good adhesive state at the adhesive joints of the drainage collecting pipe 100, and also includes, as described below, a resin preparation step in which a plurality of resin parts included in the drainage collecting pipe are prepared by resin molding, or a plurality of resin parts are brought in and prepared, an assembly step in which the prepared plurality of parts are joined at adhesive joints to assemble the drainage collecting pipe, and an inspection step (including a preparation step (in an inspection step different from the resin preparation step) and a confirmation step). The present invention relates to a method for manufacturing a drainage collecting pipe, which includes at least the steps of: [Inspection method for drainage manifold] A method (inspection method) for checking whether the connection of the drainage collecting pipe 100 is in a good connection state (a good connection state in which even minute pinholes do not exist and water does not leak) will be described in detail below with reference to Figures 5 to 7. This inspection method corresponds to an inspection step in the manufacturing method of the drainage collecting pipe described later.

[0044] As described above, this inspection method is a method for inspecting the connection of a plastic drainage collecting pipe 100 that is disposed in a through hole of a floor slab of a building and is preferably manufactured within 30 days. Here, the present invention focuses on the increasing importance of leakage inspection (leakage inspection from adhesive joints) before product shipment at a manufacturing factory of the drainage collecting pipe, and therefore, taking into consideration the lead time from completion of manufacturing to shipment, the inspection target is a plastic drainage collecting pipe 100 that is manufactured within 30 days. Note that, when the configuration of the drainage collecting pipe 100 includes a lower pipe 230 (including a lower pipe 230 connected (adhesively joined) to the drainage collecting pipe 100 shipped from the manufacturing factory), it is preferable to inspect the adhesive joint between the lower pipe 110 and the lower pipe 230 in the following inspection method. On the other hand, if the configuration of the drainage collecting pipe 100 does not include the lower pipe 230 (the lower pipe 230 is not connected (glued) to the drainage collecting pipe 100 shipped from the manufacturing factory), the adhesive part between the lower pipe 110 and the lower pipe 230 is not inspected in the following inspection method (because it is a part that is piped at the construction site and does not fall under the pre-shipment inspection part). In addition to such drainage collecting pipes in which the lower pipe 230 is not connected (glued) to the lower pipe 110 and drainage collecting pipes in which the lower pipe 230 is connected (glued) to the lower pipe 110, there are drainage collecting pipes in which the lower pipe 230 is integrally molded with the lower pipe 110, but the present invention does not care about any drainage collecting pipe, and whether the connection part between the lower pipe and the lower pipe is inspected or not is based on the state at the time of shipment from the manufacturing factory (for drainage collecting pipes in which the lower pipe 230 is integrally molded with the lower pipe 110, this part is not inspected because there is no connection part between the lower pipe and the lower pipe). Furthermore, the fact that the inspection targets are resin drainage collecting pipes 100 manufactured within 30 days is merely an arbitrary limitation. Although optional, it is also preferable that the multiple resin parts constituting the drainage collecting pipe 100 include a portion that employs a resin with excellent impact resistance. Here, a drainage collecting pipe that includes a portion that employs a resin with excellent impact resistance is a drainage collecting pipe that includes a resin-molded portion that is made by mixing 1 to 20 parts by weight of impact resistance-improved resin (reinforcement agent) with 100 parts by weight of PVC resin.More specifically, (multiple) resin parts (here, as one example, at least one of six parts: upper pipe 140, lower pipe 110, upper pipe receiving member 144, and side branch pipe receiving member 146 x 3) are resin molded by mixing 1 to 20 parts by weight of PVC resin with 100 parts by weight of PVC resin.

[0045] <Support Step> First, to perform a stable inspection, as shown in Figures 5 to 7, a support member 310 capable of supplying water to, discharging water from, and storing water inside the drainage collector pipe 100 to be inspected is used to support the drainage collector pipe 100 with the axis of the drainage collector pipe 100 approximately vertical, with the upper pipe 140 facing upward and the lower pipe 110 facing downward. This support step is also an optional step.

[0046] <Preparation steps> One electrode is a metal electrode 320 that has a semicircular shape corresponding to the maximum outer diameter of the bonded portion between the upper pipe 140 and the lower pipe 110, the bonded portion between the upper pipe connection portion 143 and the upper pipe receiving member 144, and the bonded portion between the three side branch pipe connection portions 142 and the side branch pipe receiving member 146 and can be used commonly for the bonded portions, and the other electrode is a submerged electrode 321 that comes into contact with water stored inside the drainage collecting pipe 100.Both electrodes (metal electrode 320 and submerged electrode 321) are prepared along with a power source 330 that applies (imparts, supplies) a high voltage between the two electrodes.

[0047] <Water storage step> As shown in FIG. 5, the opening of the side branch pipe receiving member 146 bonded to the side branch pipe connection portion 142 is blocked with, for example, a rubber plug 300 (using a rubber packing provided on the upper pipe receiving member 144 and the side branch pipe receiving member 146), and water is stored inside the drainage collecting pipe 100 through the support member 310 up to the full water line (above the bonding portion between the upper pipe connection portion 143 and the upper pipe receiving member 144) shown in FIG. 6. Note that the portion blocked with the rubber plug 300 using the rubber packing provided on the upper pipe receiving member 144 and the side branch pipe receiving member 146 is not subject to confirmation (inspection) of the bonding state. The reason that this portion is not subject to confirmation (inspection) is that the portion blocked with the rubber plug 300 corresponds to the portion to be piped at the construction site and does not correspond to the portion to be inspected before shipping. Also, blocking the opening of this drainage collecting pipe 100 (here, the opening of the side branch pipe receiving member 146) is an optional step that may be performed as necessary.

[0048] <Metal electrode approach step> A metal electrode 320 is brought close to or into contact with any of the bonding parts: the bonding part between the upper pipe 140 and the lower pipe 110, the bonding part between the upper pipe connection part 143 and the upper pipe receiving member 144, and the bonding part between the three side branch pipe connection parts 142 and the side branch pipe receiving member 146. In the state shown in FIG. 6, the metal electrode 320 is brought close to or into contact with the bonding part between the six-o'clock branch side branch pipe connection part 142 and the side branch pipe receiving member 146. The metal electrode 320 has a semicircular shape corresponding to the maximum outer diameter of the bonding part between the upper pipe 140 and the lower pipe 110, the bonding part between the upper pipe connection part 143 and the upper pipe receiving member 144, and the bonding part between the three side branch pipe connection parts 142 and the side branch pipe receiving member 146, and can be used in common for the bonding parts. Therefore, a single metal electrode 320 can be used to perform the following inspections: an inspection in which metal electrode 320A is brought close to or into contact with the bonded portion between upper tube 140 and lower tube 110, as shown in metal electrode 320A in Figure 7, to confirm that the bonded state at this bonded portion is good; an inspection in which metal electrode 320B is brought close to or into contact with the bonded portion between upper tube connection portion 143 and upper tube receiving member 144, as shown in metal electrode 320B in Figure 7, to confirm that the bonded state at this bonded portion is good; and an inspection in which metal electrode 320C, metal electrode 320D, and metal electrode 320E are brought close to or into contact with the bonded portions between three horizontal branch pipe connection portions 142 and horizontal branch pipe receiving member 146, as shown in metal electrode 320C, metal electrode 320D, and metal electrode 320E in Figure 7, to confirm that the bonded state at this bonded portion is good.

[0049] <High voltage application step> With the metal electrode 320 in close proximity to or in contact with any of the bonding parts between the upper pipe 140 and the lower pipe 110, the bonding part between the upper pipe connection part 143 and the upper pipe receiving member 144, and the bonding part between the three side branch pipe connection parts 142 and the side branch pipe receiving member 146, a high voltage of 40 kV or more is applied between both electrodes (between the metal electrode 320 and the submerged electrode 321) using the power source 330. Note that the order of execution of the metal electrode approaching step and the high voltage application step is not limited. Also, the voltage value of 40 kV or more applied between both electrodes (the metal electrode 320 and the submerged electrode 321) is merely an arbitrary limitation.

[0050] <Verification steps> When the metal electrode 320 is brought close to or in contact with any of the bonding parts of the bonding part between the upper pipe 140 and the lower pipe 110, the bonding part between the upper pipe connection part 143 and the upper pipe receiving member 144, and the bonding part between the three side branch pipe connection parts 142 and the side branch pipe receiving member 146, and a high voltage is applied between both electrodes (the metal electrode 320 and the submerged electrode 321), the voltage between both electrodes does not drop by more than 50% of the high voltage applied between the two electrodes, so that the bonding condition at the bonding part between the upper pipe 140 and the lower pipe 110, the bonding part between the upper pipe connection part 143 and the upper pipe receiving member 144, the bonding part between the three side branch pipe connection parts 142 and the side branch pipe receiving member 146, and the bonding part between the side branch pipe connection parts and the receiving members, to which the metal electrode 320 is brought close to or in contact, is good. It is also only an arbitrary restriction that the voltage drop between the two electrodes (metal electrode 320 and submerged electrode 321) at which it is possible to confirm that the adhesive state at the adhesive joint is good does not exceed 50% of the high voltage applied between the two electrodes. Here, the voltage drop between the two electrodes is a voltage drop caused by the occurrence of arc discharge.

[0051] The inspection method according to the present embodiment, which is carried out in this manner, has the following features.

[0052] (1) The pinhole detection principle is used to inspect the adhesive joint of the drainage collecting pipe 100. That is, when a high voltage is applied between the two electrodes (metal electrode 320 and submerged electrode 321) and a pinhole (a minute hole caused by poor adhesion) is found in the adhesive joint where the metal electrode 320 is brought close to or in contact with the electrode, an arc discharge occurs at that position, and the voltage value applied up to 40 kV drops to about 20 kV to 30 kV. By detecting the presence or absence of an arc discharge through this voltage drop, it is possible to determine the presence or absence of a pinhole in the adhesive joint of the drainage collecting pipe 100. As a result, it is possible to detect minute adhesive defects that cannot be detected by watertight inspection and airtight inspection, which include a method of submerging the drainage collecting pipe in water and pressurizing it with a pump or the like to visually detect water droplets, and a method of applying a leak detection liquid to the drainage collecting pipe in the atmosphere and pressurizing it with a pump or the like to visually detect air bubbles.

[0053] (2) In a normal pinhole inspection, for example, when inspecting a packaged product whose contents are wrapped in a packaging film with a thickness of about 1 mm, the inspection target is a thin product with a thickness of about 1 mm, so that if there is a pinhole, an arc discharge occurs and the pinhole can be detected by a voltage drop, and a high voltage of about 25 kV at maximum can be applied. The drainage manifold 100 that is the target of the inspection method of this embodiment has a bonding length of 40 mm or less, but is considerably longer than 1 mm, so the inspection voltage applied is increased to 40 kV or more compared to the normal pinhole inspection. This makes it possible to inspect the bonding portion between resin piping members with a bonding length of 40 mm or less, and to detect minute bonding defects that cannot be detected by the above-mentioned watertightness inspection and airtightness inspection.

[0054] (3) Since the metal electrode 320 is semicircular in shape, the inner diameter (diameter) of the semicircle of the semicircular metal electrode 320 is set to approximately 155 mm or more so that the same metal electrode 320 can be used to inspect the portion to be inspected in the drainage collecting pipe 100, whether the maximum outer diameter is 150 mm (the joint between the upper pipe 140 and the lower pipe 110) or the minimum outer diameter is 104 mm (the joint between the side branch pipe connecting part 142 and the side branch pipe receiving member 146). This makes it possible to inspect along the outer diameter of the joint in the drainage collecting pipe 100, improving operability and shortening the inspection time.

[0055] Furthermore, although the inspection can be performed even if the adhesive portion to be inspected and the metal electrode 320 are spaced (closed) from each other by about 10 mm to 20 mm, it is also preferable to have them directly contact each other as shown in FIG. Therefore, a single metal electrode 320 can be used to perform the following inspections: an inspection in which metal electrode 320AA is brought into contact with the bond between upper tube 140 and lower tube 110, as with metal electrode 320AA shown in Figure 8, to confirm that the bond at this bond is good; an inspection in which metal electrode 320BB is brought into contact with the bond between upper tube connection portion 143 and upper tube receiving member 144, as with metal electrode 320BB shown in Figure 8, to confirm that the bond at this bond is good; and an inspection in which metal electrode 320CC, metal electrode 320DD, and metal electrode 320EE are brought into contact with the bond between three horizontal branch pipe connection portions 142 and horizontal branch pipe receiving member 146, as with metal electrode 320CC, metal electrode 320DD, and metal electrode 320EE shown in Figure 8, to confirm that the bond at these bond portions is good.

[0056] It should be noted that the metal electrode 320 (not the submerged electrode 321) is not limited to having a semicircular shape, and may have a shape such as a metal brush (a brush for removing rust, etc., made of many short metal wires planted like a toothbrush).

[0057] The drainage collecting pipe 100 according to the present embodiment, which is the subject of such an inspection, will be described in detail below. The drainage collecting pipe 100 has the following configuration as a premise. As a premise, the drainage collecting pipe 100 is a resin drainage collecting pipe arranged in a through hole of the floor slab of a building, and includes an upper pipe 140 protruding above the floor slab and a lower pipe 110 bonded to the lower side of the upper pipe 140 (by inserting the lower insertion port 140MD into the lower pipe receiving port 110F). The upper pipe 140 includes an upper pipe connecting portion 143 that connects an upper pipe 220 that allows drainage water to flow in from the upper floor, and at least one horizontal branch pipe connecting portion 142 that connects a horizontal branch pipe above the floor slab. The lower pipe 110 includes a lower pipe connecting portion 130 that connects a lower pipe that allows drainage water to flow out to the lower floor. Resin-made receiving members (upper pipe receiving member 144, horizontal branch pipe receiving member 146) are bonded to the upper pipe connecting portion 143 and the horizontal branch pipe connecting portion 142, respectively. More specifically, the upper pipe connecting portion 143 and the upper pipe receiving member 144 are bonded by inserting the upper spigot 140MU of the upper pipe connecting portion 143 into the upper spigot 144F of the upper pipe receiving member 144, and the horizontal branch pipe connecting portion 142 and the horizontal branch pipe receiving member 146 are bonded by inserting the spigot 146M of the horizontal branch pipe receiving member 146 into the horizontal spigot 142F of the horizontal branch pipe connecting portion 142. The connections to be inspected are the bonding portion between the upper pipe 140 and the lower pipe 110, the bonding portion between the upper pipe connecting portion 143 and the upper pipe receiving member 144, and the bonding portion between the horizontal branch pipe connecting portion 142 and the horizontal branch pipe receiving member 146.

[0058] In addition to these assumptions, this drainage collector pipe 100 can be configured such that, if necessary, the receiving members (upper pipe receiving member 144 and / or side branch pipe receiving member 146) are blocked and water is stored inside the drainage collector pipe 100, and the bonding state at the bonding portion between the upper pipe 140 and lower pipe 110, the bonding state at the bonding portion between the upper pipe connection portion 143 and upper pipe receiving member 144, and the bonding state at the bonding portion between the side branch pipe connection portion 142 and side branch pipe receiving member 146 can be confirmed by applying a high voltage between the two electrodes, with one electrode serving as a metal electrode 320 that is close to or in contact with one of the bonding portions, and the other electrode serving as a submerged electrode 321 that is in contact with the water stored inside the drainage collector pipe 100, and not dropping the voltage between the two electrodes, thereby confirming that the bonding state is good.

[0059] In addition to the above-mentioned premise, preferably, in this drainage collecting pipe 100, resin receiving members (upper pipe receiving member 144, side branch pipe receiving member 146) are bonded to the upper pipe connecting portion 143 and the side branch pipe connecting portion 142. The support member 310, which is capable of supplying water to the inside of the drainage collecting pipe, discharging water from the inside, and storing water inside, and which is equipped with a submerged electrode 321 that can contact the water stored inside, supports the drainage collecting pipe 100 with the axis of the drainage collecting pipe 100 approximately vertical, with the upper pipe 140 facing up and the lower pipe 110 facing down. In this supported state, the horizontal branch pipe receiving member 146 attached to the horizontal branch pipe connection portion 142 is blocked, and water is stored inside the drainage collecting pipe 100 via the support member 310.The bonding state at the bonding portion between the upper pipe 140 and the lower pipe 110, the bonding state at the bonding portion between the upper pipe connection portion 143 and the upper pipe receiving member 144, and the bonding state at the bonding portion between the horizontal branch pipe connection portion 142 and the horizontal branch pipe receiving member 146 can be confirmed by applying a high voltage between the two electrodes as a metal electrode 320, one electrode approaching or in contact with one of the bonding portions, and a submerged electrode 321, the other electrode in contact with the water stored inside the drainage collecting pipe, and not dropping the voltage between the two electrodes, thereby confirming that the bonding state is good.

[0060] More preferably, in addition to the above-mentioned premise, this drainage collector pipe 100 is a drainage collector pipe in which a metal electrode 320 having a semicircular shape corresponding to the maximum outer diameter of the adhesive portion between the upper pipe 140 and the lower pipe 110, the adhesive portion between the upper pipe connection portion 143 and the upper pipe receiving member 144, and the adhesive portion between the side branch pipe connection portion 142 and the side branch pipe receiving member 146 can be commonly used for the adhesive portions.

[0061] More preferably, in addition to the above-mentioned premise, this drainage collector pipe 100 is a drainage collector pipe whose bonding state can be confirmed to be good by judging that the voltage between the two electrodes does not drop by more than 50% of the high voltage applied between the two electrodes.

[0062] More preferably, in addition to the above-mentioned premise, the drainage collector pipe 100 is a drainage collector pipe in which the adhesion state can be confirmed to be good by determining that there is no voltage drop between the two electrodes when a high voltage of 40 kV or more is applied between the two electrodes.

[0063] More preferably, in addition to the above-mentioned premise, the drainage collector pipe 100 is a drainage collector pipe in which the receiving members (upper pipe receiving member 144 and / or side branch pipe receiving member 146) are blocked with rubber plugs 300 using the rubber gaskets provided on these receiving members, and the areas blocked with the rubber gaskets are excluded from checking the adhesion condition.

[0064] More preferably, in addition to the above-mentioned prerequisites, the drainage collecting pipe 100 is a drainage collecting pipe that has been confirmed to have good adhesive conditions at the adhesive joints within 30 days from the date of manufacture.

[0065] [Manufacturing method of drainage manifold] Hereinafter, a method for manufacturing a drainage collecting pipe 100 according to an embodiment of the present invention will be described with reference to the above-mentioned [method for inspecting drainage collecting pipe]. This manufacturing method is a method for manufacturing a resin drainage collecting pipe 100 arranged in a through hole of a floor slab of a building. This drainage collecting pipe 100 includes an upper pipe protruding above the floor slab and a lower pipe bonded below the upper pipe. In the drainage collecting pipe, the upper pipe includes an upper pipe connection part connecting an upper pipe through which drainage water flows in from the upper floor and at least one horizontal branch pipe connection part connecting a horizontal branch pipe above the floor slab, and the lower pipe includes a lower pipe connection part connecting a lower pipe through which drainage water flows out to the lower floor. A resin receiving member is bonded to each of the upper pipe connection part and the horizontal branch pipe connection part, and includes a bonding part between the upper pipe and the lower pipe, a bonding part between the upper pipe connection part and the receiving member, and a bonding part between the horizontal branch pipe connection part and the receiving member. This manufacturing method for the drainage collecting pipe 100 includes an inspection step for ensuring that the bonding state at the bonding part is good. This manufacturing method includes a resin preparation step of preparing multiple resin parts included in the drainage collecting pipe by resin molding or by transporting and preparing multiple resin parts, an assembly step of assembling the drainage collecting pipe by joining the multiple parts at their bonding parts using an adhesive, and an inspection step of inspecting the bonding state at the bonding parts of the assembled drainage collecting pipe. This inspection step (corresponding to the inspection method described above) includes a preparation step of preparing a power source and electrodes for applying a high voltage between two electrodes, one of which is an external metal electrode provided on the outside of the drainage collecting pipe and the other is an internal metal electrode provided inside the drainage collecting pipe, and a confirmation step of bringing the external metal electrode close to or into contact with one of the bonding parts and applying a high voltage between the two electrodes, so that it can be confirmed that the bonding state at the bonding part is good by not observing a voltage drop between the two electrodes, which is a voltage drop caused by the occurrence of arc discharge.Here, if the person and / or place performing the resin preparation step is different from the person and / or place performing the steps other than the resin preparation step, the resin preparation step is a step of transporting the multiple resin parts included in the drainage collecting pipe 100 from a resin molding factory where resin molding is performed to a drainage collecting pipe manufacturing factory for preparation, and if the person and / or place performing the resin preparation step is the same as the person and / or place performing the steps other than the resin preparation step, the resin preparation step is a step of preparing the multiple resin parts included in the drainage collecting pipe 100 by resin molding. In the assembly step, the joint parts of the six resin injection molded products shown in FIG. 3(A) are bonded with an adhesive. The male side indicated by the alphabet M immediately following the number of the code in FIG. 3(A) is fitted to the female side indicated by the alphabet F, and the fitting parts are bonded with an adhesive. The details of this bonding part are as described above with reference to FIG. 4.

[0066] Here, in the confirmation step, in a state where a high voltage of 40 kV or more is applied between both electrodes, It is also preferable to be able to confirm that the bonding state at the bonding joint is good by observing that the voltage drop between the two electrodes, which is caused by the occurrence of arc discharge, does not exceed 50% of the high voltage applied between the two electrodes.

[0067] [Characteristics of the drainage manifold (itself)] The characteristics of the drainage collecting pipe (itself) according to the present invention will be described below. The following description will clarify the characteristics of the drainage collecting pipe (itself) according to the present invention, and the performance of the drainage collecting pipe (itself) (adhesive performance of the adhesive part, water-stopping performance of the outer layer member, impact resistance performance, etc.).

[0068] Characteristics of the drainage manifold (itself) in terms of adhesive performance (adhesion) of the adhesive joint In the drainage collecting pipe 100 according to the present invention, the upper pipe 140 and the lower pipe 110 are bonded with an adhesive at their respective bonding sections, with the upper pipe receiving member 144 made of resin attached to the upper pipe connecting section 143 of the upper pipe 140, and the side branch pipe receiving member 146 made of resin attached to the side branch pipe connecting section 142. Since the drainage collecting pipe 100 and the receiving member are resin molded products, a parting line or weld line is formed at these bonding sections, causing a slight step. The fact that the drainage collecting pipe 100 (here, the upper pipe 140 and the lower pipe 110) and the receiving member (the upper pipe receiving member 144 and the side branch pipe receiving member 146) have these steps is a factor that inhibits adhesion at the bonding section. This slight step is 0.01 mm or more and 0.8 mm or less, and includes cases where a slight step is formed due to a burr or a gouge in addition to the parting line or weld line. Thus, although the drainage collector pipe 100 (here, upper pipe 140 and lower pipe 110) and the receiving members (upper pipe receiving member 144 and side branch pipe receiving member 146) have these steps which impede adhesion at the bonded joints, the drainage collector pipe 100 (itself) has good adhesion at the bonded joint between the upper pipe 140 and lower pipe 110 and at the bonded joint between the upper pipe 140 and the receiving members. The drainage collector pipe (itself) whose adhesion has been confirmed is the drainage collector pipe of the present invention.

[0069] Furthermore, the drainage collecting pipe 100 according to the present invention (particularly the receiving member) has a portion where the wall thickness is partially thicker. Specifically, there is a portion where the wall thickness is partially (width 0.5T or more) thicker (1.1T or more) than the original wall thickness T. A specific example is a rib 146ML provided on the inside of the (male side) adhesive part 146M of the receiving part (horizontal branch pipe receiving member 146 in this FIG. 10) as shown in FIG. 10. This portion is a portion where the wall thickness is partially thicker than the original wall thickness T, which causes sink marks. The sink marks are a factor that inhibits adhesion in that portion (here, the adhesive portion between the side branch pipe connection portion 142 of the upper pipe 140 and the side branch pipe receiving member 146), but the drainage collecting pipe (itself) for which the adhesiveness of the adhesive portions including this portion (the adhesive portion between the upper pipe 140 and the lower pipe 110, and the adhesive portion between the upper pipe 140 and the receiving member (upper pipe receiving member 144 and side branch pipe receiving member 146)) has been confirmed is the drainage collecting pipe of the present invention. In particular, there are cases in which the outer layer member is attached to the resin (injection) molded portion with oil from the molding adhering thereto, and this can cause poor adhesion in the adhesive portions where the parts are bonded together with the oil remaining (here, the adhesive portion between the upper pipe 140 and the lower pipe 110, and the adhesive portion between the upper pipe 140 and the receiving member (upper pipe receiving member 144 and side branch pipe receiving member 146)), but such a possibility is avoided or suppressed in the drainage collecting pipe of the present invention. In addition, the center of the (circular) adhesive part in the receiving member (upper pipe receiving member 144 and horizontal branch pipe receiving member 146) is misaligned with the center of the (circular) receiving part in the drainage collector pipe, and when the receiving part is pressed into the receiving part during bonding, the misalignment with the adhesive part may cause the parts to tilt, resulting in poor bonding; however, such a possibility is avoided or suppressed in the drainage collector pipe of the present invention.

[0070] Furthermore, in the drainage collecting pipe 100 according to the present invention, the adhesive portion between the upper pipe 140 and the lower pipe 110, the adhesive portion between the side branch pipe connecting portion 142 of the upper pipe 140 and the side branch pipe receiving member 146, , there is an adhesive joint between the upper pipe connection part 143 of the upper pipe 140 and the upper pipe receiving member 144. In these adhesive joints, the adhesive strength of the adhesive joint 24 hours after bonding is 0.5 MPa or more, as the adhesive performance. This adhesive strength is calculated by dividing the maximum load in a tensile test (10 mm / min) by the area of ​​the adhesive joint. And a drainage collecting pipe (itself) in which the adhesive strength of these adhesive joints (24 hours after bonding) is 0.5 MPa or more is the drainage collecting pipe according to the present invention.

[0071] Characteristics of the drainage manifold (itself) with respect to the water-stopping performance (water-stopping properties) of the outer layer material In the case where the drainage collecting pipe 100 according to the present invention includes an outer layer member 700, and the upper and lower ends of the outer layer member (more specifically, a sound-insulating cover as described later) are attached in close contact with the outer peripheral surface of the drainage collecting pipe 100 (of the upper pipe 140 and / or the lower pipe 110) to form the drainage collecting pipe 100, a parting line or weld line is formed at the position of the outer surface of the drainage collecting pipe 100 corresponding to the upper and lower ends of the outer layer member 700 due to the drainage collecting pipe 100 being a resin molded product, resulting in a slight step. The fact that the drainage collecting pipe (itself) 100 has these steps in this way is a factor that inhibits the water-stopping ability at the attachment point of the outer layer member 700. As described above, this slight step is 0.01 mm or more and 0.8 mm or less, and includes the case where a slight step is generated due to a burr or a gouge in addition to the parting line or weld line. Thus, the drainage collecting pipe 100 (itself) has these steps, which become a factor that inhibits watertightness at the attachment point of the outer layer member 700, but the drainage collecting pipe 100 (itself) has watertightness to prevent water from entering between the drainage collecting pipe 100 and the outer layer member 700. The drainage collecting pipe (itself) that has been confirmed to have this watertightness is the drainage collecting pipe of the present invention.

[0072] Furthermore, in cases where the outer layer member 700 has a structure of two or more layers (here, a three-layer structure consisting of a vibration-damping material, a vibration insulator formed of fire-resistant inorganic fiber, and a sound-insulating cover from the outer surface of the drainage collecting pipe 100), only the outermost sound-insulating cover exists at the upper and lower ends described above, and the sound-insulating cover is formed containing an elastomer-based or resin-based material (such as EPDM (ethylene propylene diene rubber)) (it may be made of not only soft materials such as rubber but also hard PVC). Since the outer layer member 700 including this sound-insulating cover must be attached to the outer surface of the drainage collecting pipe 100 (more specifically, since the upper and lower ends of the sound-insulating cover must be attached in close contact with the outer surface of the drainage collecting pipe), the inner diameter of the sound-insulating cover is the same as or larger than the outer diameter of the main body of the drainage collecting pipe 100 (upper pipe 140 and / or lower pipe 110) (if it is smaller, it cannot be attached without taking the trouble to widen it). In this way, although the lack of an interference fit is disadvantageous in terms of watertightness (it is a factor that impedes watertightness), the drainage collecting pipe 100 (itself) has watertightness to prevent water from entering between the drainage collecting pipe 100 and the outer layer member 700. The drainage collecting pipe (itself) that has been confirmed for its watertightness is the drainage collecting pipe of the present invention. In particular, the outer layer member may be attached to a resin (injection) molded part with oil adhering thereto during molding, and if parts are bonded together while the oil remains (in this case, if the outer layer member is bonded to the drainage collecting pipe), there is a possibility of poor adhesion, but such a possibility is avoided or suppressed in the drainage collecting pipe of the present invention.

[0073] Characteristics of the drainage manifold (itself) in terms of impact resistance (impact resistance) The drainage collecting pipe 100 of the present invention is composed of two components, an upper pipe 140 and a lower pipe 110 (the upper pipe 140 and the lower pipe 110 are glued together to form the drainage collecting pipe), and is provided with impact resistance when a side branch pipe receiving member 146, which is a separate component from the upper pipe 140, is attached (by glue) to the side branch pipe connecting portion 142 of the upper pipe 140, and an upper pipe receiving member 144, which is a separate component from the upper pipe 140, is attached (by glue) to the upper pipe connecting portion 143 of the upper pipe 140.

[0074] The upper pipe 140, the lower pipe 110, and the receiving member (the side branch pipe receiving member 146 and the upper The drainage collecting pipe according to the present invention, which is composed of the pipe receiving member 144, is a resin molded product, and has some parts at the corners or edges where the chamfering is small (more specifically, R0.1 to R0.3), and when the drainage collecting pipe is dropped, stress is concentrated at these parts where the chamfering is small, which becomes the starting point of cracks (breakage). For example, as shown in FIG. 11, an example of such a part is the chamfered part 110ER provided at the bottom 110E of the receiving port of the lower pipe 110 into which the lower end of the upper pipe 140 is inserted. When a spigot (the lower end of the upper pipe 140) is inserted into a receiving port (of the lower pipe 110) having such a chamfered part 110ER at its bottom, a force is applied that spreads the receiving port of the lower pipe 110 outward. In this case, if the chamfer of the chamfered portion 110ER at the receiving port is small (R0.1 or more and R0.3 or less), stress is likely to concentrate, and when the drainage collecting pipe is dropped, stress will be concentrated at that part (in this case, the joint between the upper pipe 140 and the lower pipe 110, but in the case of a two-stage drainage collecting pipe 200 as shown in Figure 7, etc., the joint between the upper lower pipe 110 and the lower upper pipe 140), which may cause a crack to start (at the chamfered portion 110ER), resulting in damage to the receiving port of the resin molded product on the receiving port side.

[0075] 11 described above, but also in the case of a resin molded product (on the receiving port side) into which the spigot side is inserted and attached, if the chamfer at the bottom of the receiving port is small (R0.1 or more and R0.3 or less), stress tends to concentrate as described above, and when the drainage collecting pipe is dropped, stress will concentrate in that area, which may become the starting point of a crack and cause damage (to the receiving port of the resin molded product on the receiving port side). The drainage collecting pipe (itself) according to the present invention is characterized in that the chamfer at the bottom of the receiving port is not small (R0.3 or more), improving impact resistance.

[0076] In addition, since the circumferential thickness of the adhesive portion (for example, the (male) adhesive portion 146M in the horizontal branch pipe receiving member 146 shown in FIG. 10(B)) of the receiving member constituting the drainage collecting pipe according to the present invention (side branch pipe receiving member 146 and upper pipe receiving member 144) is 3 mm or more and 10 mm or less (because the receiving member is not designed to be excessively thick in the circumferential direction for the reason of increasing impact resistance), it may be damaged by stress concentration when the drainage collecting pipe is dropped, as described above. The drainage collecting pipe (itself) according to the present invention is characterized by improved impact resistance despite the receiving member having an excessively thick circumferential thickness (not exceeding 10 mm). In addition, if the chamfer (R) of the outer periphery at the tip of the receiving member constituting the drainage collecting pipe according to the present invention (side branch pipe receiving member 146 and upper pipe receiving member 144) is small, it may be damaged when the drainage collecting pipe is dropped, as described above, so it is preferable that the chamfer (R) is larger than R3 for the receiving member of a normal drainage collecting pipe. The drainage collecting pipe (itself) according to the present invention is characterized by improved impact resistance, even though the chamfer (R) of the outer periphery of the tip of the receiving member is not excessively large (R0.1≦R≦R3). For example, the chamfer (R) of the outer periphery of the tip of the receiving member (side branch pipe receiving member 146 and upper pipe receiving member 144) constituting the drainage collecting pipe according to the present invention is R1, which is considerably smaller than the chamfer (R) of the outer periphery of the tip of the receiving member constituting a normal drainage collecting pipe (for example, R3 is not included because it is usually larger than R3, but it is assumed here as R3), yet it has enough impact resistance to not break when the drainage collecting pipe is dropped.

[0077] The drainage collector pipe according to the present invention, which has such features (no small chamfer at the bottom of the receiving port, and / or the circumferential thickness of the receiving port member is not excessively thick), is guaranteed to ensure that the drainage collector pipe and the resin receiving port member included in the drainage collector pipe will not be damaged even if the drainage collector pipe is dropped along with the cardboard box used as the packaging material during transportation from the drainage collector pipe manufacturing plant to the construction site. A drainage collector pipe with such impact resistance is the drainage collector pipe according to the present invention. In other words, a drainage collector pipe that has impact resistance without having a chamfer of the above-mentioned size at the bottom of the receiving port (having a chamfer of greater than R0.3 at the bottom of the receiving port) and / or has impact resistance despite the circumferential thickness of the bonding part of the receiving port member (side branch pipe receiving member 146 and upper pipe receiving member 144) (for example, the (male) bonding part 146M of the side branch pipe receiving member 146 is 3 mm or more and 10 mm or less) is a drainage collector pipe according to the present invention. The weld lines in the product can also become the starting point for cracks when the drainage manifold is dropped.

[0078] Other features of the drainage manifold (itself) Furthermore, the drainage collecting pipe according to the present invention has the following features. The roughness coefficient of the inner surface of a PVC part, which is a resin molded product, is 0.009 or more and 0.014 or less. The tensile strength of the PVC part, which is a resin molded product, based on JIS K6739 is 40MPa or more and 60MPa or less.

[0079] As described above, according to the drainage collector pipe and manufacturing method of the present embodiment, it is possible to provide a drainage collector pipe made of resin to be placed in a through hole in the floor slab of a building, in which the bonding condition at the bonded joint between the separately injection molded upper pipe and lower pipe, and at the bonded joint between the upper pipe connection part and the horizontal branch pipe connection part and the resin receiving member can be quickly, easily and reliably confirmed (inspected) (confirmed within a specified day from the date of manufacture), and in particular, even in a drainage collector pipe with a short bonding length relative to the DV joint, the bonding condition at the bonded joint can be quickly, easily and reliably confirmed (inspected) (confirmed within a specified day from the date of manufacture) and a manufacturing method for a drainage collector pipe.

[0080] <Modification> Returning to Fig. 9, a modified example of the drainage collecting pipe according to this embodiment will be described with reference to Fig. 9. In the drainage collecting pipe 100 described above, the lower end of the upper pipe 140 is fitted onto the upper end of the lower pipe 110, and the upper pipe 140 and the lower pipe 110 are bonded at this fitting portion. More specifically, the bonded portion between the upper pipe 140 and the lower pipe 110 is the portion where the lower insertion port 140MD provided at the lower end of the upper pipe 140 and the lower pipe socket 110F provided at the upper end of the lower pipe 110 are bonded, and more specifically, the lower insertion port 140MD is inserted into the lower pipe socket 110F and bonded as shown in Figs. 3(A) and 4.

[0081] As shown in FIG. 9, the drainage collecting pipe 101 according to this modification does not have such a lower pipe socket 110F. As shown in FIG. 9(A) to FIG. 9(E), the drainage collecting pipe 101 according to this modification is composed of a lower pipe 111 without a lower pipe socket and an upper pipe 141 (basically the same as the upper pipe 140). In the drainage collecting pipe 101 according to this modification, the upper pipe 141 and the lower pipe 111 are joined using a socket 400. Here, it is preferable that the outer diameter and the inner diameter at the lower end of the upper pipe 141 are the same as the outer diameter and the inner diameter at the upper end of the lower pipe 111. Such a socket 400 is fitted onto the lower end of the upper pipe 141 and the upper end of the lower pipe 111 to join the upper pipe 141 and the lower pipe 111.

[0082] More specifically, the upper pipe 141 and the lower pipe 111 are joined by inserting the spigot 141M at the lower end of the upper pipe 141 into the socket 400FU on one side (here, the upper side) of the socket 400 and adhesively joining the two pipes, and inserting the spigot 111M at the upper end of the lower pipe 111 into the socket 400FD on the other side (here, the lower side) of the socket 400 and adhesively joining the two pipes. By dividing the connection parts in this way (dividing the lower pipe, which had an integrated lower pipe socket, into a socket separate from the lower pipe and a lower pipe without a lower pipe socket), it becomes possible to change the material of only that part (here, the socket, which is the connection part). For example, a transparent material can be used for the connection part to make the connection visible, or the reliability of the joint can be improved by increasing the strength of only the connection part compared to the other parts (upper pipe, lower pipe, etc.). By adopting such a structure, it is possible to stabilize the quality without having a complicated structure.

[0083] It can be confirmed that the upper pipe 140 and the lower pipe 110 in the drainage collecting pipe 100 described above are in a good bonding state at the bonding joint where the upper pipe 140 and the lower pipe 110 are inserted into the lower insertion port 140MD provided at the lower end of the upper pipe 140 and the lower pipe receiving port 110F provided at the upper end of the lower pipe 110 and bonded. Likewise, in the drainage collecting pipe 101 according to this modification, it can be confirmed that the adhesive state at the adhesive joint where the upper pipe 141 and the lower pipe 111 are adhesively joined via the socket 400 is good. In detail, in the metal electrode approach step of the inspection method in this modification, the metal electrode 320 is brought close to or into contact with the adhesive joint where the spigot 141M at the lower end of the upper pipe 141 is inserted into the socket 400FU on one side (here, the upper side) of the socket 400 and the adhesive joint where the spigot 111M at the upper end of the lower pipe 111 is inserted into the socket 400FD on the other side (here, the lower side) of the socket 400, so that it can be confirmed that the adhesive state at the adhesive joint of the drainage collecting pipe 101 according to this modification is good, just like the drainage collecting pipe 100 described above.

[0084] It should be noted that the embodiments disclosed herein are illustrative and not restrictive in all respects. The scope of the present invention is defined by the claims, not the above description, and is intended to include all modifications within the meaning and scope of the claims. [Industrial Applicability]

[0085] The present invention is preferable for drainage collecting pipes that are shipped from a drainage collecting pipe manufacturing plant with multiple resin members bonded together, and is particularly preferable for drainage collecting pipes in which the bonding state (good connection state without water leakage) at the bonding part between the upper pipe and the lower pipe, and at the bonding part between the upper pipe connection part and the side branch pipe connection part and the resin receiving part can be quickly, easily, and reliably confirmed (inspected) (confirmed within a predetermined day from the date of manufacture). Furthermore, the manufacturing method according to the present invention is particularly preferable in that it can manufacture a drainage collecting pipe in which the bonding state (good connection state without water leakage) at the bonding part between the upper pipe and the lower pipe, and at the bonding part between the upper pipe connection part and the side branch pipe connection part and the resin receiving part can be quickly, easily, and reliably confirmed (inspected) (confirmed within a predetermined day from the date of manufacture). [Explanation of symbols]

[0086] 100 Drainage collection pipe 110 Lower pipe 114 Swirling blade 116 Thermally expandable fireproofing materials 130 Lower pipe connection 140 Upper pipe 142 Horizontal branch pipe connection 143 Upper pipe connection 144 Upper pipe receiving part 146 Horizontal branch pipe receiving member 150 Outer layer material 300 Rubber stopper 310 Support member 320 Metal electrode 321 Submerged Electrode 330 Power supply

Claims

1. A resin drainage collecting pipe to be placed in a through hole of a floor slab of a building, The drainage collecting pipe includes an upper pipe protruding above the floor slab and a lower pipe bonded below the upper pipe, The upper pipe includes an upper pipe connection portion for connecting an upper pipe through which drainage water flows in from an upper floor, and at least one horizontal branch pipe connection portion for connecting a horizontal branch pipe above the floor slab, The lower pipe includes a lower pipe connection portion for connecting a lower pipe that drains wastewater to a lower floor, a resin receiving member is bonded to each of the upper pipe connecting portion and the horizontal branch pipe connecting portion; A drainage collecting pipe characterized in that the receiving member can be blocked as necessary, water can be stored inside the drainage collecting pipe, and the bonding condition at the bonding portion between the upper pipe and the lower pipe, the bonding condition at the bonding portion between the upper pipe connection portion and the receiving member, and the bonding condition at the bonding portion between the side branch pipe connection portion and the receiving member can be confirmed to be good by applying a high voltage between the two electrodes as a metal electrode that is brought close to or into contact with either of the bonding portions and the other electrode into contact with the water stored inside the drainage collecting pipe, and checking that no voltage drop occurs between the two electrodes due to the occurrence of arc discharge.

2. A resin drainage collecting pipe to be placed in a through hole of a floor slab of a building, The drainage collecting pipe includes an upper pipe protruding above the floor slab and a lower pipe bonded below the upper pipe, The upper pipe includes an upper pipe connection portion for connecting an upper pipe through which drainage water flows in from an upper floor, and at least one horizontal branch pipe connection portion for connecting a horizontal branch pipe above the floor slab, The lower pipe includes a lower pipe connection portion for connecting a lower pipe that drains wastewater to a lower floor, a resin receiving member is bonded to each of the upper pipe connecting portion and the horizontal branch pipe connecting portion; The drainage collecting pipe is supported by a support member capable of supplying water to the inside of the drainage collecting pipe, discharging water from the inside of the drainage collecting pipe, and storing water therein, the support member having an electrode capable of contacting the water stored therein, with the drainage collecting pipe supported in a state in which the axis of the drainage collecting pipe is substantially vertical, the upper pipe is at the top, and the lower pipe is at the bottom; A drainage collecting pipe characterized in that the receiving member attached to the horizontal branch pipe connection portion is blocked, water is stored inside the drainage collecting pipe via the support member, and the bonding condition at the bonding portion between the upper pipe and the lower pipe, the bonding condition at the bonding portion between the upper pipe connection portion and the receiving member, and the bonding condition at the bonding portion between the horizontal branch pipe connection portion and the receiving member can be confirmed to be good by applying a high voltage between the two electrodes as a metal electrode that is brought close to or into contact with either of the bonding portions and the other electrode being brought into contact with the water stored inside the drainage collecting pipe, and checking to see that no voltage drop occurs between the two electrodes due to the generation of an arc discharge.

3. The drainage collecting pipe described in claim 1 or claim 2, characterized in that the shape of the metal electrode is a semicircular shape corresponding to the maximum outer diameter of the adhesive portion between the upper pipe and the lower pipe, the adhesive portion between the upper pipe connection portion and the receiving member, and the adhesive portion between the horizontal branch pipe connection portion and the receiving member, and can be used commonly for the adhesive portions.

4. 3. The drainage collecting pipe according to claim 1 or 2, wherein no voltage drop occurs between the two electrodes means that the voltage drop does not exceed 50% of the high voltage applied between the two electrodes.

5. 3. The drainage collecting pipe according to claim 1 or 2, wherein the high voltage is 40 kV or more.

6. The length of the bonded portion in the tube axis direction is 40 mm or less. The drainage collecting pipe according to claim 1 or 2.

7. The adhesive portion is formed by fitting a small outer diameter of a plug into a socket having an inner diameter corresponding to the outer diameter of the plug, The bonding length in the tube axis direction of the bonding portion is the insertion length in the insertion port, 3. The drainage collecting pipe according to claim 1, wherein the ratio of the bonding length to the outer diameter of the spigot is 40% or less.

8. 3. The drainage collecting pipe according to claim 1, wherein the receiving member is sealed with a rubber packing, and the portion sealed with the rubber packing is excluded from the object of checking the adhesive condition.

9. 3. The drainage collecting pipe according to claim 1, wherein the adhesive state of the adhesive portion of the drainage collecting pipe has been confirmed to be good within 30 days from the date of manufacture.

10. A method for manufacturing a resin drainage collecting pipe to be placed in a through hole of a floor slab of a building, comprising the steps of: The drainage collecting pipe includes an upper pipe protruding above the floor slab and a lower pipe bonded below the upper pipe, In the drainage collecting pipe, The upper pipe includes an upper pipe connection portion for connecting an upper pipe through which drainage water flows in from an upper floor, and at least one horizontal branch pipe connection portion for connecting a horizontal branch pipe above the floor slab, The lower pipe includes a lower pipe connection portion for connecting a lower pipe that drains wastewater to a lower floor, a resin receiving member is bonded to each of the upper pipe connecting portion and the horizontal branch pipe connecting portion; an adhesive portion between the upper pipe and the lower pipe, an adhesive portion between the upper pipe connection portion and the receiving member, and an adhesive portion between the lateral branch pipe connection portion and the receiving member, The manufacturing method includes an inspection step for ensuring that a bonding state at the bonding portion is good, The manufacturing method includes: A resin preparation step of preparing a plurality of resin parts included in the drainage collecting pipe by resin molding or by carrying in and preparing the plurality of resin parts; an assembly step of assembling the drainage collecting pipe by joining the adhesive portions of the plurality of components using an adhesive; and an inspection step of inspecting a bonding state of the adhesive portion of the assembled drainage collecting pipe, The inspection step includes: a preparation step of preparing a power source and electrodes for applying a high voltage between one electrode as an external metal electrode provided outside the drainage collecting pipe and the other electrode as an internal metal electrode provided inside the drainage collecting pipe; and a confirmation step of bringing the external metal electrode close to or into contact with either of the adhesive joints and applying a high voltage between the two electrodes, thereby confirming that the adhesive condition at the adhesive joint is good by not observing any voltage drop between the two electrodes, which is a voltage drop caused by the occurrence of an arc discharge.

11. 11. The method for manufacturing a drainage manifold according to claim 10, characterized in that in the confirmation step, when a high voltage of 40 kV or more is applied between the two electrodes, a voltage drop caused by an arc discharge is not observed between the two electrodes that exceeds 50% of the high voltage applied between the two electrodes, thereby confirming that the bonding state at the bonding part is good.

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