JP2024060881A - Method for inspecting drain assembled pipe - Google Patents

Abstract

To quickly, easily and securely confirm a bonding state in a drain assembled pipe to be delivered from a manufacturing plant after a plurality of resin members are bonded with each other.SOLUTION: In a drain assembled pipe 100, an upper tube 140, a lower tube 110, an upper tube receiving port member 144, and a horizontal branch tube receiving port member 146 as resin injection molded articles are bonded with each other at predetermined bonding parts. The drain assembled pipe 100 can confirm that a bonding state is excellent by the fact that a voltage does not drop even if a high voltage is applied between both electrodes while using one electrode as a metal electrode 320 to be brought closer to or into contact with any connection part and the other electrode as a submergence electrode 321 to be brought into contact with water stored in the drain assembled pipe, with respect to a bonding state in the bonding part between the upper tube 140 and the lower tube 110, a bonding state of the bonding part between an upper tube connection part 143 and the upper tube receiving port member 144, and a bonding state of the bonding part between a horizontal branch tube connection part 142 and the horizontal branch tube receiving port member 146.SELECTED DRAWING: Figure 6

Description

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 part that connects the upper pipe through which wastewater flows in from the upper floor and at least one horizontal branch pipe connection part that connects a horizontal branch pipe above the floor slab, and the lower pipe including a lower pipe connection part 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 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 horizontal branch pipe connection part and the 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 state (good connection state without water leakage) at the bonding part to be quickly, easily, and reliably confirmed (inspected) (confirmed within a specified day from the date of manufacture) even for a drainage collector pipe with a short bonding length to make the drainage collector pipe more compact than the DV joint. In addition to this type of drainage collecting pipe, the present invention also includes an inspection method for the same. Also, when a drainage collecting pipe is shipped from a manufacturing plant, multiple parts are joined together, but since the present invention only covers joints that are made with adhesive, the following description does not distinguish between "adhesion" and "adhesive joining."

Apartment buildings, office buildings, and the like are equipped with water supply and drainage facilities. The most widely known drainage system is a drainage piping structure that includes vertical pipes (standpipes, upper standpipes, lower standpipes, upper pipes, lower pipes) 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 coupling, or drainage collector joint) that connects these.

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 drainage 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 drainage 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.

In this type of plastic drainage collecting pipe, the upper and lower pipes, which are injection molded separately, are adhesively joined together 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 before being shipped. Then, at the construction site, the side branch pipe or the upstream (upper layer) upper pipe (upper standpipe) is connected via a receiving member equipped with a rubber ring (rubber packing) or the like. Drainage collecting pipes manufactured in this way at the manufacturing factory and constructed on site undergo 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 being shipped.

Usually, adhesive joints in plastic pipes are inspected using water pressure or air pressure. For example, Japanese Patent No. 4312032 (Patent Document 1) (although not for drainage manifolds) discloses a water pressure inspection method for soft pipes, which is carried out at the time of completion of construction of a pipeline made of synthetic resin pipes, i.e., soft pipes, to inspect the pipeline for water leakage. This inspection method is a water pressure inspection method for a pipeline made of soft pipes and including a valve, and includes the following:
(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 time;
(b) reloading the pipeline to the first water pressure;
(c) Immediately thereafter, reduce the water pressure to the second water pressure;
(d) measuring a first measured water pressure, which is the water pressure in the pipeline a second hour 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 reference water pressure and less than the second reference water pressure, measure a second measured water pressure, which is the water pressure in the pipeline after a third hour;
(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:

Patent No. 4312032

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 pre-loading the pipeline with a water pressure greater than the inspection water pressure, erroneous judgments can be prevented and highly accurate leak inspection can be performed. Furthermore, since even minute leaks can be detected by leaving it for a certain period of time, the inspection method disclosed in Patent Document 1 has been highly praised 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 water pressure is detected during the repeated pressurization, leaving it, re-pressurization, and depressurization, which lengthens the cycle time of the leak inspection.

Instead of this leak inspection method using water pressure detection, other inspection methods include a method in which a pipe fitting (an example of a workpiece to be inspected) is submerged in water and pressurized with a pump or the like, and a method in which a leak detection liquid is applied to the pipe fitting in the atmosphere and then pressurized with a pump or the like. In such cases, the presence or absence of a leak is determined by the worker (inspector) visually checking for water droplets or air bubbles. However, it is not possible to completely eliminate the possibility that some workers may not be able to determine whether the bubbles are from the pipe fitting or bubbles attached to the jig or equipment and may overlook them, and differences in the experience of workers may also mean that uniform inspection results cannot be obtained. Furthermore, as with Patent Document 1, water or air needs to be stored in the pipe fitting, so the problem of a long cycle time remains.

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, 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), the adhesive length in the axial direction (shown in Figure 4) increases from 22 mm, 25 mm, 35 mm, 40 mm, 50 mm, 65 mm, to 80 mm. Thus, in DV joints, the ratio of the adhesive length to the outer diameter of the spigot is 42% or more. On the other hand, the length of the joint (glued part) of the drainage collecting pipe (= the glued length in the pipe axis direction) is designed to be short (shallow), for example, 20 mm, 20 mm, and 30 mm in the glued length (depth) in the pipe axis direction for outer diameters of φ104, φ114, and φ150, respectively, so that the product dimensions of the drainage collecting pipe are compact. In the drainage collecting pipe, the ratio of the glued length to the spigot outer diameter is 40% or less. For this reason, compared to general DV joints, the importance of leak inspections (leak inspections from glued joints) before the product is shipped at the drainage collecting pipe manufacturing plant is increasing.

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 bonding joint between the separately injection molded upper pipe and lower pipe, and at the bonding 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, to provide a drainage collector pipe and an inspection method for a drainage collector pipe in which the bonding condition at the bonding joint 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 bonding length relative to the DV joint.

To achieve the above objective, the drainage manifold and the drainage manifold inspection method of the present invention employ the following technical measures.

The drainage collector pipe according to one aspect of the present invention is 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 an upper pipe through which drainage water 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, the lower pipe including a lower pipe connection portion that connects a lower pipe through which drainage water flows out to the lower floor, and a plastic receiving member is bonded to each of the upper pipe connection portion and the horizontal branch pipe connection portion, If necessary, the receiving member can be blocked and water can be 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 side branch pipe connection part and the receiving member can be confirmed by using one electrode as a metal electrode that is brought close to or in contact with one of the bonding parts and the other electrode in contact with the water stored inside the drainage collecting pipe, applying a high voltage between the two electrodes, and checking that there is no drop in voltage between the two electrodes to confirm that the bonding conditions are good.

In addition, 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 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, a resin receiving member is bonded to each of the upper pipe connection portion and the horizontal branch pipe connection portion, and a support member that is capable of supplying water to the inside of the drainage collecting pipe, discharging water from the inside, and storing water inside the drainage collecting pipe, and is equipped with an electrode that can come into contact with the water stored inside the drainage collecting pipe. The drainage collector pipe is supported by a support member with the axis of the drainage collector pipe in a substantially vertical state, with the upper pipe facing up and the lower pipe facing down, and the receiving member attached to the side branch pipe connection is blocked, and water is stored inside the drainage collector pipe through the support member, and the bonding state at the bonding portion between the upper pipe and the lower pipe, the bonding state at the bonding portion between the upper pipe connection portion and the receiving member, and the bonding state at the bonding portion between the side branch pipe connection portion and the receiving member are confirmed by using a metal electrode with one electrode approaching or contacting one of the bonding portions and the other electrode in contact with the water stored inside the drainage collector pipe, applying a high voltage between the two electrodes, and checking that the voltage between the two electrodes does not drop, thereby confirming that the bonding state is good.

Preferably, the shape of the metal electrode is a semicircular shape that corresponds 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 configured so as to be commonly used for the adhesive portions.

More preferably, the absence of a voltage drop between the two electrodes can be configured to mean that the voltage does not drop by more than 50% of the high voltage applied between the two electrodes.

More preferably, the high voltage can be configured to be 40 kV or more.

More preferably, the length of the bond in the tube axis direction at the bonded portion can be configured to be 40 mm or less.

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.

More preferably, the receiving member can be configured to be sealed with a rubber packing, and the area sealed with the rubber packing is excluded from the target for checking the adhesion state.

More preferably, the adhesive condition of the adhesive joint can be confirmed to be good for drainage manifolds manufactured within 30 days of the date of manufacture.

In order to achieve the above object, a method for inspecting a drainage collecting pipe according to yet another aspect of the present invention is a method for inspecting a drainage collecting pipe made of resin 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 the 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 the lower floor, a resin receiving member is bonded to each of the upper pipe connection portion and the horizontal branch pipe connection portion, one electrode is a metal electrode and the other electrode is a metal electrode stored inside the drainage collecting pipe, The method includes the steps of preparing a power source and electrodes that apply a high voltage between the two electrodes as electrodes that are to be in contact with the water stored inside the drainage collecting pipe, blocking the receiving member as necessary and storing water inside the drainage collecting pipe, and checking the adhesion state at the adhesion part between the upper pipe and the lower pipe, the adhesion state at the adhesion part between the upper pipe connection part and the receiving member, and the adhesion state at the adhesion part between the horizontal branch pipe connection part and the receiving member by placing one electrode as a metal electrode that is close to or in contact with any of the adhesion parts and placing the other electrode in contact with the water stored inside the drainage collecting pipe, applying a high voltage between the two electrodes, and checking that the voltage between the two electrodes does not drop, thereby confirming that the adhesion state is good.

In order to achieve the above object, a drainage collecting pipe inspection method according to yet another aspect of the present invention is a method for inspecting 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 to the lower part of the upper pipe, the upper pipe including an upper pipe connection part that connects an upper pipe through which drainage water flows in from an upper floor and at least one horizontal branch pipe connection part that connects a horizontal branch pipe above the floor slab, the lower pipe including a lower pipe connection part 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 part and the horizontal branch pipe connection part, and a support member that is capable of supplying water to the inside of the drainage collecting pipe, discharging water from the inside, and storing water in the inside, and a support member that is equipped with an electrode that can come into contact with the water stored inside, the support member supports the drainage collecting pipe with a support member that supports the drainage collecting pipe with the axis of the drainage collecting pipe being substantially vertical and with the upper pipe facing upward and the lower pipe facing downward. The method includes the steps of: preparing a power supply and electrodes for applying a high voltage between the two electrodes, one of which is a metal electrode and the other of which is an electrode that comes into contact with the water stored inside the drainage collecting pipe; blocking the receiving member attached to the side branch pipe connection and storing water inside the drainage collecting pipe through the support member; bringing the metal electrode close to or into contact with any of the bonding parts between the upper pipe and the lower pipe, the bonding part between the upper pipe connection part and the receiving member, and the bonding part between the side branch pipe connection part and the receiving member; applying a high voltage between the two electrodes using the power supply; and verifying that 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 side branch pipe connection part and the receiving member are good by not dropping the voltage between the two electrodes when a high voltage is applied between the two electrodes.

In order to achieve the above object, a drainage collecting pipe inspection method according to yet another aspect of the present invention is a method for inspecting a resin drainage collecting pipe that is placed in a through hole of a floor slab of a building and is manufactured within 30 days, the drainage collecting pipe including an upper pipe that protrudes above the floor slab and a lower pipe that is bonded to the lower side of the upper pipe with a bonding length of 40 mm or less in the pipe axis direction, the upper pipe including an upper pipe connection part that connects an upper pipe that allows drainage to flow in from an upper floor and at least one horizontal branch pipe connection part that connects a horizontal branch pipe above the floor slab, and the lower pipe including a lower pipe connection part that connects a lower pipe that allows drainage to flow out to a lower floor. a connecting portion, a resin receiving member is respectively attached to the upper pipe connecting portion and the horizontal branch pipe connecting portion with a bonding length in the pipe axis direction of 40 mm or less, the bonding length being the length in the pipe axis direction at the bonding portion, and the support member is capable of supplying water to the inside of the drainage collecting pipe, discharging water from the inside, and storing water in the inside, the support member having an electrode capable of contacting the water stored inside, and supporting the drainage collecting pipe with the axis of the drainage collecting pipe in a substantially vertical state with the upper pipe facing up and the lower pipe facing down; a step of preparing a power source and an electrode for applying a high voltage between the two electrodes, the metal electrode being semicircular in shape corresponding to the maximum outer diameter of the adhesive portion between the upper pipe connection portion and the receiving member and the adhesive portion between the side branch pipe connection portion and the receiving member, and the other electrode being an electrode for contacting the water stored inside the drainage collecting pipe; a step of sealing the receiving member attached to the side branch pipe connection portion with a rubber packing and storing water inside the drainage collecting pipe via the support member; The method includes the steps of: bringing the metal electrode close to or into contact with any of the adhesive joints between the horizontal branch pipe connection portion and the receiving member; applying a high voltage of 40 kV or more between the two electrodes using the power source; and confirming that the adhesive condition at the adhesive joint between the upper pipe and the lower pipe, the adhesive condition at the adhesive joint between the upper pipe connection portion and the receiving member, and the adhesive condition at the adhesive joint between the horizontal branch pipe connection portion and the receiving member are good when the voltage between the two electrodes does not drop by more than 50% of the high voltage applied between the two electrodes while the high voltage is applied between the two electrodes.

According to the present invention, it is possible to provide a drainage collector pipe made of resin that is placed in a through hole in the floor slab of a building, and in which the adhesive condition at the adhesive joint between the upper pipe and lower pipe, which are separately injection molded, and at the adhesive 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 a drainage collector pipe inspection method that can quickly, easily, and reliably confirm (inspect) the adhesive condition at the adhesive joint (confirmed within a specified day from the date of manufacture) even in a drainage collector pipe with a short adhesive length relative to the DV joint.

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. 1A is a perspective view showing a drainage manifold 100 according to an embodiment of the present invention, in which (A) is a perspective view showing a state in which the drainage manifold 100 is filled with a heat-expandable fire-resistant material 116, and (B) is a perspective view showing a state in which the heat-expandable fire-resistant material 116 is not filled. 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. 1 is a diagram for explaining a bonding length in a drainage collecting pipe according to an embodiment of the present invention. FIG. FIG. 1 is a diagram (part 1) for explaining a method for inspecting a drainage manifold according to an embodiment of the present invention. FIG. 2 is a diagram (part 2) for explaining the method for inspecting a drainage manifold according to an embodiment of the present invention. FIG. 3 is a diagram (part 3) for explaining the method for inspecting a drainage manifold according to an embodiment of the present invention. FIG. 4 is a diagram (part 4) for explaining the method for inspecting a drainage manifold according to an embodiment of the present invention. 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.

In the following, a drainage collecting pipe 100 according to an embodiment of the present invention and an inspection method thereof will be described in detail with reference to Figs. 1 to 8. Here, the drainage collecting pipe according to the present invention is a drainage collecting pipe characterized in that the adhesive state of the adhesive joint can be confirmed to be good by an inspection described later (confirmed within a predetermined day from the date of manufacture). 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, the thermally expandable fireproof material, the fireproof material, and the thermally expandable material may not be clearly distinguished from each other. In addition, in order 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 Fig. 7). In addition, the symbols (consisting of numbers and (if necessary) letters) attached to the dashed lines in the drawings indicate the numbers as the drawing numbers and the letters as the branch numbers (A, B, C, etc.) in the drawings, and the drawings identified by the symbols are shown in enlarged views (particularly Fig. 9).

The drainage manifold 100 according to the embodiment of the present invention will be described in detail below with reference to the drawings. As shown in Figs. 1 to 3, the drainage piping structure using the drainage manifold 100 has a non-fire-resistant resin drainage manifold 100 installed in a through hole that vertically penetrates a floor slab in a building, and a resin drainage standpipe (upper floor 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 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 manifold 100. Here, "non-fire-resistant" refers to a property that can be deformed, melted, or burned by the heat caused by a fire in a building, and is, for example, made of resin.

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 made of, for example, polyvinyl chloride, polyethylene, polybutene, polypropylene, or nylon. The drainage riser pipe may be, for example, a so-called fireproof two-layer pipe. As shown in FIG. 3(A), the drainage collector pipe 100 is made of one or more resin injection molded products (six in this example: upper pipe 140, lower pipe 110, upper pipe receiving member 144, and horizontal branch pipe receiving member 146 x 3). As shown in FIG. 1 to FIG. 3, the drainage collector pipe 100 is a resin drainage collector pipe that is placed in a through hole in the floor slab of a building, and includes an upper pipe 140 that protrudes above the floor slab and a lower pipe 110 that is bonded below the upper pipe 140. The upper pipe 140 includes an upper pipe connection section 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 section 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 section 130 to which a lower pipe 230 is attached for discharging wastewater 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 section 143 and the horizontal branch pipe connection section 142, respectively.

Here, in the case where this drainage manifold 100 is not for the lowest floor, as shown in Figures 3(A) and 3(B), as an 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 this recess 112 is filled with a thermally expandable fireproof material 116.

Although not limited thereto, the thermally expandable fire-resistant 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 fill the depression 112 up to the outer diameter of the lower pipe 110 (an amount sufficient to achieve the desired fire resistance). Therefore, the outer diameter of the lower pipe 110 of the drainage collecting pipe 100 is approximately the same as that of a conventional drainage piping joint. In this way, as shown in FIG. 1(B), the thermally expandable fire-resistant 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).

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, but may be a deflector plate or the like, as long as it is a part that changes the flow of drainage in the drainage collecting pipe 100, and is not limited to 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.

Furthermore, it is preferable that the outer layer of the thermally expandable fireproof material 116 is provided with an outer layer member 150 having fire resistance and vibration suppression properties, which is wrapped around the outer periphery of the lower pipe 110 to cover it, and 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 periphery 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 vibration damping material, vibration insulator formed of fire-resistant inorganic fiber, and sound insulation cover, from the outer surface of the drainage collecting pipe 100. As an example, the innermost layer of vibration-damping material is formed containing a butyl-based (butyl rubber, etc.) or asphalt-based (rubber asphalt, modified asphalt, etc.) material, the outermost sound-insulating cover is formed containing a rubber-based (EPDM (ethylene propylene diene rubber) etc.), elastomer-based or resin-based material (it can be made of not only soft materials such as rubber but also hard PVC), and the middle layer of vibration insulator made of fire-resistant inorganic fibers is formed from an aggregate of fire-resistant inorganic fibers (glass wool, rock wool, ceramic fiber, etc.).

As shown in Fig. 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 a side branch pipe connection section 142 that connects side branch pipes at three locations at 90° intervals in a top view via a side branch pipe receiving member 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 6 o'clock branch shown in Fig. 7).

In addition, 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 adhesive. The drainage collecting pipe 100 and the inspection method for the drainage collecting pipe according to this embodiment are a drainage collecting pipe and an inspection method that can quickly, easily, and reliably confirm (inspect) the adhesive state at the adhesive parts, that is, the adhesive part between the upper pipe 140 and the lower pipe 110, the adhesive part between the upper pipe connection part 143 and the upper pipe receiving member 144, and the adhesive part between the side branch pipe connection part 142 and the side branch pipe receiving member 146 (confirmed within a predetermined day from the date of manufacture). For this reason, these adhesive 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 spigot F shown in FIG. 4.

As shown in FIG. 4, in order to generally join and connect resin piping components with adhesive, the connection preparation shown in FIG. 4(A), the connection start shown in FIG. 4(B), and the connection completion process 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 components are bonded with the adhesive (which forms a lubricating layer) applied to the outer surface of the spigot M and the inner surface of the socket F. When bonded in this manner, the tube axis direction is the direction shown in FIG. 4(A), and the bonding length in the tube axis direction is, as shown in FIG. 4(C), bonding length in the tube axis direction = socket length L(1) = insertion length L(2). In this way, the bonding length is the length in the tube axis direction of the piping components to be bonded to each other, and in the present invention, the bonding length in the direction of the outer or inner peripheral surface of the piping components is not taken into consideration, so in the present invention, even if it is simply described as bonding length, it refers to the bonding length in the tube axis direction shown in FIG. 4.

The drainage manifold and inspection method according to the present invention focus on the fact that, in order to make the product dimensions of the drainage manifold manufactured by bonding the resin injection molded products compact, the bond length (depth) in the pipe axis direction is designed to be 20 mm and 30 mm, respectively, even if the outer diameter of the bonded resin injection molded products is φ114 and φ150, which is shorter (shallower) than that of a general DV joint, and therefore, compared to a general DV joint, the importance of leakage inspection (leak inspection from the bonded joint) before product shipment at the manufacturing factory of the drainage manifold is increasing. And, the object of the present invention is to be able to quickly, easily, and reliably check (inspect) the bonding condition of the bonded joint in this drainage manifold (checked within a specified day from the date of manufacture).

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 is attached by inserting the lower insertion port 140MD into the lower pipe receiving port 110F as shown in Figures 3(A) and 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 lateral branch pipe connecting parts 142 and the lateral branch pipe receiving members 146 are the parts where the lateral receiving ports 142F of the lateral branch pipe connecting parts 142 provided at three locations on the side of the upper pipe 140 are adhesively joined to the spigots 146M of the lateral branch pipe receiving members 146, and more specifically, the spigots 146M are inserted into the lateral 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, while 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.

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

Furthermore, in cases where the connection length in the tube axis direction (the length where the inserting side and the inserted side overlap in the tube axis direction, which is one example, corresponds to the adhesive length shown in Figure 4(C) (receptacle length L(1) at socket F = insertion length L(2) at socket M)) or corresponds to the tightening margin shown in Figure 4(B), the length in the tube axis direction is 40 mm or less.

Below, a method (inspection method) for checking whether the connection of such a drainage manifold 100 is in a good connection state (a good connection state in which there are no pinholes or even tiny holes and no water leaks) will be described in detail with reference to Figures 5 to 7.

As described above, this inspection method is an inspection method for the connection of the resin drainage collecting pipe 100 that is disposed in the through hole of the floor slab of the building and is preferably manufactured within 30 days. Here, the present invention focuses on the increasing importance of leakage inspection (leakage inspection from adhesive joint) before the product is shipped from the manufacturing factory of the drainage collecting pipe, so that the inspection target is the resin drainage collecting pipe 100 that is manufactured within 30 days, taking into consideration the lead time from the completion of manufacturing to the shipment. Note that, when the configuration of the drainage collecting pipe 100 includes the lower pipe 230 (including the 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 (adhesively bonded) 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 to be piped at the construction site and does not correspond to the pre-shipment inspection part). In addition to such drainage collecting pipes in which the lower pipe 230 is not connected (adhesively bonded) to the lower pipe 110 and drainage collecting pipes in which the lower pipe 230 is connected (adhesively bonded) 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). In addition, the fact that the inspection object is a resin-made drainage collecting pipe 100 within 30 days from the date of manufacture is merely an arbitrary limitation.

<Support step>
First, for 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 collecting pipe 100 to be inspected is used to support the drainage collecting pipe 100 with the axis of the drainage collecting 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.

<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, and 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.

<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 the 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 needed.

<Metal electrode approach step>
A metal electrode 320 is brought close to or into contact with any of the adhesive parts: the adhesive part between the upper pipe 140 and the lower pipe 110, the adhesive part between the upper pipe connection part 143 and the upper pipe receiving member 144, and the adhesive 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 adhesive 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 adhesive part between the upper pipe 140 and the lower pipe 110, the adhesive part between the upper pipe connection part 143 and the upper pipe receiving member 144, and the adhesive 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 adhesive 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 adhesive portion between upper pipe 140 and lower pipe 110, as shown in metal electrode 320A in Figure 7, to confirm that the adhesive condition at this adhesive portion is good; an inspection in which metal electrode 320B is brought close to or into contact with the adhesive portion between upper pipe connection portion 143 and upper pipe receiving member 144, as shown in metal electrode 320B in Figure 7, to confirm that the adhesive condition at this adhesive 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 adhesive 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 adhesive condition at this adhesive portion is good.

<High voltage application step>
With the metal electrode 320 in close proximity to or in contact with any of the adhesive joints between the upper pipe 140 and the lower pipe 110, the adhesive joint between the upper pipe connection part 143 and the upper pipe receiving member 144, and the adhesive joint between the three side branch pipe connections 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 approach 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.

<Confirmation step>
When a metal electrode 320 is brought close to or in contact with any of the adhesive joints between the upper pipe 140 and lower pipe 110, the adhesive joint between the upper pipe connection part 143 and upper pipe receiving member 144, and the adhesive joint 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 (metal electrode 320 and submerged electrode 321), the voltage between the two electrodes does not drop by more than 50% of the high voltage applied between the two electrodes, thereby confirming that the adhesive conditions at the adhesive joint between the upper pipe 140 and lower pipe 110, the adhesive joint between the upper pipe connection part 143 and upper pipe receiving member 144, the adhesive joint between the three side branch pipe connection parts 142 and the side branch pipe receiving member 146, and the adhesive joint between the side branch pipe connection parts and the receiving members, where the metal electrode 320 is brought close to or in contact with the adhesive joint, are good. Furthermore, the voltage drop between the two electrodes (metal electrode 320 and submerged electrode 321) that can be used to confirm that the adhesive condition at the adhesive joint is good is merely an arbitrary limitation that does not exceed 50% of the high voltage applied between the two electrodes.

The inspection method according to this embodiment, which is carried out in this manner, has the following features:

(1) The pinhole detection principle is used to inspect the adhesive joint of the drainage collecting pipe 100. That is, if a pinhole (a tiny hole caused by poor adhesion) is found in the adhesive joint when the metal electrode 320 is brought close to or in contact with the two electrodes (metal electrode 320 and submerged electrode 321) by applying a high voltage between the two electrodes, 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 watertightness inspections and airtightness inspections, which include a method in which the drainage collecting pipe is submerged in water and pressurized with a pump or the like to visually detect water droplets, and a method in which a leak detection liquid is applied to the drainage collecting pipe in the atmosphere and pressurized with a pump or the like to visually detect air bubbles.

(2) In a normal pinhole inspection, for example, when inspecting a packaged product whose contents are wrapped in a packaging film about 1 mm thick, the inspection target is a thin product of about 1 mm, so there is no need to apply an unnecessarily high voltage. If there is a pinhole, an arc discharge occurs and the pinhole can be detected by a voltage drop, so a high voltage of up to about 25 kV 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 parts between resin piping components 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.

(3) Since the shape of the metal electrode 320 is semicircular, the inner diameter (
The diameter of the drainage collecting pipe 100 is set to about 155 mm or more. This allows the inspection to be performed along the outer diameter of the bonded portion of the drainage collecting pipe 100, improving operability and shortening the inspection time.

In addition, the adhesive part to be inspected and the metal electrode 320 can be inspected even if they are placed close together (close to each other) at a distance of about 10 mm to 20 mm, but it is also preferable to have them directly contact each other, for example, as shown in Figure 8. For this reason, a single metal electrode 320 can be used to perform the following inspections: an inspection to confirm that the adhesive state at the adhesive joint between the upper pipe 140 and the lower pipe 110 is good by contacting the metal electrode 320AA as shown in FIG. 8; an inspection to confirm that the adhesive state at the adhesive joint is good by contacting the metal electrode 320BB as shown in FIG. 8 with the adhesive joint between the upper pipe connection part 143 and the upper pipe receiving member 144; and an inspection to confirm that the adhesive state at the adhesive joint is good by contacting the metal electrode 320CC, metal electrode 320DD, and metal electrode 320EE as shown in FIG. 8 with the adhesive joint between the three side branch pipe connection parts 142 and the side branch pipe receiving member 146.

The metal electrode 320 (not the submerged electrode 321) is not limited to having a semicircular shape, but 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).

The drainage collecting pipe 100 according to the present embodiment of the inspection object 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 below 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 connection portion 143 that connects an upper pipe 220 that allows drainage to flow in from the upper floor, and at least one horizontal branch pipe connection portion 142 that connects a horizontal branch pipe above the floor slab. The lower pipe 110 includes a lower pipe connection portion 130 that connects a lower pipe that allows drainage 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 connection portion 143 and the horizontal branch pipe connection portion 142, respectively. More specifically, the upper pipe connection portion 143 and the upper pipe receiving member 144 are bonded by inserting the upper spigot 140MU of the upper pipe connection portion 143 into the upper spigot 144F of the upper pipe receiving member 144, and the horizontal branch pipe connection 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 connection 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 connection portion 143 and the upper pipe receiving member 144, and the bonding portion between the horizontal branch pipe connection portion 142 and the horizontal branch pipe receiving member 146.

In addition to these assumptions, this drainage collecting pipe 100 can be used by blocking the receiving members (upper pipe receiving member 144 and/or side branch pipe receiving member 146) as necessary, storing water inside the drainage collecting pipe 100, and checking 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 side branch pipe connection portion 142 and the side branch pipe receiving member 146. One electrode is a metal electrode 320 that is close to or in contact with one of the bonding portions, and the other electrode is a submerged electrode 321 that is in contact with the water stored inside the drainage collecting pipe 100. By applying a high voltage between the two electrodes and not dropping the voltage between the two electrodes, it can be confirmed that the bonding state is good.

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, respectively. 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, supports the drainage collecting pipe 100 with the axis of the drainage collecting pipe 100 in a state where the upper pipe 140 is at the top and the lower pipe 110 is at the bottom, with the support member 310 having a submerged electrode 321 that can contact the water stored inside. In this supported state, the side branch pipe receiving member 146 bonded to the side branch pipe connecting portion 142 is blocked, water is stored inside the drainage collecting pipe 100 via the support member 310, and the upper pipe 140 and the lower pipe 110 are supported by the support member 310.
Regarding the adhesive condition at the adhesive joint between 10 and upper pipe connection part 143, the adhesive condition at the adhesive joint between upper pipe connection part 143 and upper pipe receiving member 144, and the adhesive condition at the adhesive joint between horizontal branch pipe connection part 142 and horizontal branch pipe receiving member 146, one electrode is a metal electrode 320 that is brought close to or into contact with one of the adhesive joints, and the other electrode is a submerged electrode 321 that is brought into contact with water stored inside the drainage collecting pipe, and when a high voltage is applied between the two electrodes, there is no drop in voltage between the two electrodes, which confirms that the adhesive condition is good.

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 part between the upper pipe 140 and the lower pipe 110, the adhesive part between the upper pipe connection part 143 and the upper pipe receiving member 144, and the adhesive part between the side branch pipe connection part 142 and the side branch pipe receiving member 146 can be commonly used for the adhesive parts.

More preferably, in addition to the above-mentioned premise, this drainage collector pipe 100 is a drainage collector pipe in which the voltage between the two electrodes does not drop by more than 50% of the high voltage applied between the two electrodes, and thus it can be determined that the adhesion is good.

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.

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 plugged with rubber plugs 300 using the rubber packing provided on these receiving members, and the areas plugged with the rubber packing are excluded from the target for checking the adhesion state.

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

As described above, the drainage collector pipe and the inspection method for the drainage collector pipe according to the present embodiment provide a drainage collector pipe made of resin that is placed in a through hole in the floor slab of a building, and in which the adhesive condition at the adhesive joint between the upper pipe and the lower pipe, which are separately injection molded, and at the adhesive 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 adhesive length relative to the DV joint, the adhesive condition at the adhesive joint can be quickly, easily, and reliably confirmed (inspected) (confirmed within a specified day from the date of manufacture) and a drainage collector pipe inspection method can be provided.

<Modification>
A modified example of the drainage collecting pipe according to the present 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 together at this fitting portion. More specifically, the bonded portion between the upper pipe 140 and the lower pipe 110 is a 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 together, and more specifically, the lower insertion port 140MD is inserted into the lower pipe socket 110F and bonded together as shown in Figs. 3(A) and 4.

As shown in FIG. 9, the drainage collecting pipe 101 according to this modification does not have such a lower pipe receiving port 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 receiving port 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 inner diameter of the lower end of the upper pipe 141 are the same as the outer diameter and inner diameter of 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.

More specifically, the spigot 141M at the lower end of the upper tube 141 is inserted into the socket 400FU on one side (here, the upper side) of the socket 400 and adhesively joined, and the spigot 111M at the upper end of the lower tube 111 is inserted into the socket 400FD on the other side (here, the lower side) of the socket 400 and adhesively joined, thereby joining the upper tube 141 and the lower tube 111. By dividing the connection parts in this way (dividing the lower tube, which had an integrated lower tube socket, into a socket separate from the lower tube and a lower tube without a lower tube socket), it becomes possible to change the material of only that part (here, the socket, which is the connection part), and for example, it is possible to use a transparent material for the connection part so that the connection part can be visually confirmed, or to increase the strength of only the connection part compared to the other parts (upper tube, lower tube, etc.) to increase the reliability of the joint. By adopting such a structure, it is possible to stabilize the quality without having a complicated structure.

Just as it can be confirmed that the adhesive bond between the upper pipe 140 and the lower pipe 110 in the above-mentioned drainage collecting pipe 100 is good when they are inserted into the lower insertion port 140MD at the lower end of the upper pipe 140 and the lower pipe receiving port 110F at the upper end of the lower pipe 110, it can also be confirmed that the adhesive bond between the upper pipe 141 and the lower pipe 111 in the drainage collecting pipe 101 of this modified example is good when they are bonded via the socket 400. More specifically, in this modified example, in the metal electrode approach step of the inspection method, the metal electrode 320 is brought close to or into contact with the adhesive portion formed by inserting the spigot 141M at the lower end of the upper pipe 141 into the receptacle 400FU on one side (here the upper side) of the socket 400 and adhesively bonding, and the adhesive portion formed by inserting the spigot 111M at the upper end of the lower pipe 111 into the receptacle 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 portion of the drainage collector pipe 101 according to this modified example is good, just like the drainage collector pipe 100 described above.

It should be noted that the embodiments disclosed herein are illustrative in all respects and are not restrictive. The scope of the present invention is indicated by the claims rather than the above description, and is intended to include all modifications within the meaning and scope of the claims.

The present invention is preferable for drainage collector pipes that are shipped from a drainage collector pipe manufacturing plant with multiple resin members bonded together, and is particularly preferable for drainage collector pipes that can be quickly, easily, and reliably confirmed (inspected) for 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 (confirmed within a specified day from the date of manufacture). Furthermore, the inspection method according to the present invention is particularly preferable in that it can be applied to drainage collector pipes that can be quickly, easily, and reliably confirmed (inspected) for 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 (confirmed within a specified day from the date of manufacture).

Explanation of the Reference Signs 100 Drainage collecting pipe 110 Lower pipe 114 Swirling vane 116 Thermally expandable fireproof material 130 Lower pipe connection part 140 Upper pipe 142 Side branch pipe connection part 143 Upper pipe connection part 144 Upper pipe receiving part 146 Side branch pipe receiving part 150 Outer layer part 300 Rubber stopper 310 Supporting part 320 Metal electrode 321 Submerged electrode 330 Power source

Claims (12)

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 the drainage 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 one of the bonding portions and the other electrode into contact with the water stored inside the drainage collecting pipe, and checking that the voltage between the two electrodes does not drop. 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 discharges 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 one of the bonding portions and the other electrode into contact with the water stored inside the drainage collecting pipe, and checking that the voltage between the two electrodes does not drop. The drainage collecting pipe according to claim 1 or 2, characterized in that the shape of the metal electrode is a semicircular shape corresponding to the maximum outer diameter of the adhesive part between the upper pipe and the lower pipe, the adhesive part between the upper pipe connection part and the receiving member, and the adhesive part between the side branch pipe connection part and the receiving member, and can be commonly used for the adhesive parts. The drainage collecting pipe according to claim 1 or 2, characterized in that the voltage between the two electrodes does not drop by more than 50% of the high voltage applied between the two electrodes. The drainage manifold according to claim 1 or 2, characterized in that the high voltage is 40 kV or more. The drainage collecting pipe according to claim 1 or 2, characterized in that the adhesive length in the axial direction of the adhesive part is 40 mm or less. 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. The drainage collecting pipe according to claim 1 or 2, characterized in that the receiving member is sealed with a rubber packing, and the portion sealed with the rubber packing is excluded from the target for checking the adhesion state. The drainage collecting pipe according to claim 1 or 2, characterized in that the adhesive state of the adhesive part has been confirmed to be good for the drainage collecting pipe within 30 days from the date of manufacture. A method for inspecting a plastic drainage collecting pipe arranged 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,
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 discharges 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 step of preparing a power supply and electrodes for applying a high voltage between one electrode as a metal electrode and the other electrode as an electrode that is in contact with the water stored inside the drainage collecting pipe;
If necessary, closing the receiving member to store water inside the drainage collecting pipe;
a step of confirming that the adhesive conditions at the adhesive joint between the upper pipe and the lower pipe, the adhesive joint between the upper pipe connection part and the receiving member, and the adhesive joint between the horizontal branch pipe connection part and the receiving member are good by applying a high voltage between the two electrodes using a metal electrode that is brought close to or into contact with one of the adhesive joints and bringing the other electrode into contact with water stored inside the drainage collecting pipe, and checking that the voltage between the two electrodes does not drop. A method for inspecting a plastic drainage collecting pipe arranged 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,
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 discharges 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 step of supporting the drainage collecting pipe with a support member capable of supplying water to, discharging water from, and storing water therein, the support member having an electrode capable of contacting the water stored therein, with the drainage collecting pipe being 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 step of preparing a power supply and electrodes for applying a high voltage between one electrode as a metal electrode and the other electrode as an electrode that is in contact with the water stored inside the drainage collecting pipe;
a step of storing water inside the drainage collecting pipe through the support member by closing a receiving member adhered to the horizontal branch pipe connection portion;
bringing the metal electrode close to or into contact with any one of the adhesive portions, that is, 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 side branch pipe connection portion and the receiving member;
applying a high voltage between the electrodes using the power supply;
and a step of confirming that 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 are good by applying a high voltage between the two electrodes and finding that the voltage between the two electrodes does not drop. A method for inspecting a plastic drainage collecting pipe that is to be placed in a through hole of a floor slab of a building and that is manufactured within 30 days, 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 with a bonding length in the pipe axis direction of 40 mm or less,
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 discharges wastewater to a lower floor,
a resin receiving member is bonded to the upper pipe connection portion and the horizontal branch pipe connection portion with a bonding length of 40 mm or less in a pipe axis direction,
The bonding length is a length in the tube axial direction of the bonding portion,
a step of supporting the drainage collecting pipe with a support member capable of supplying water to, discharging water from, and storing water therein, the support member having an electrode capable of contacting the water stored therein, with the drainage collecting pipe being 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;
preparing a power supply and electrodes for applying a high voltage between the two electrodes, one of which is a metal electrode having a semicircular shape corresponding to the maximum outer diameter of the bonded portion between the upper pipe and the lower pipe, the bonded portion between the upper pipe connection portion and the receiving member, and the bonded portion between the horizontal branch pipe connection portion and the receiving member, and the other electrode being an electrode that comes into contact with the water stored inside the drainage collecting pipe;
a step of sealing the receiving member adhered to the horizontal branch pipe connection portion with a rubber packing and storing water inside the drainage collecting pipe through the support member;
bringing the metal electrode close to or into contact with any one of the adhesive portions: 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 side branch pipe connection portion and the receiving member;
applying a high voltage of 40 kV or more between both electrodes using the power supply;
and confirming that 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 are good when a high voltage is applied between the two electrodes and the voltage between the two electrodes does not drop by more than 50% of the high voltage applied between the two electrodes.

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