Drainage collecting pipe and manufacturing method of drainage collecting pipe

Abstract

To make a drainage collecting pipe itself possess the cut-off performance of an outer layer member as a technical characteristic which cannot be achieved by an outer layer member single unit and by a drainage collecting pipe single unit except for the outer layer member.SOLUTION: A drainage collecting pipe 100 includes an upper pipe 140 and a lower pipe 110, and an outer layer member 700 is attached to an external periphery from a branch lower part up to the lower pipe 110. The drainage collecting pipe possesses such a technical characteristic that a first state that first hydraulic pressure is imparted to an upper-side cut-off part WP(U) of a sound insulation cover 730 of the outer layer member 700 is continued until a first time elapses, next, a second state that second hydraulic pressure lower than the first hydraulic pressure is imparted to a lower-side cut-off part WP(D) of the sound insulation cover 730 of the outer layer member 700 is continued until a second time elapses, after that, it is confirmed that water from the upper-side cut-off part WP(U) and the lower-side cut-off part WP(D) does not intrude into the sound insulation cover 730 of the outer layer member 700, and thus, the drainage collecting pipe itself can obtain the favorable cut-off performance of the outer layer member 700.SELECTED DRAWING: Figure 6

Description

[Technical field]

[0001] The present invention relates to a resin drainage collecting pipe installed in a through hole of a floor slab of a building, the drainage collecting pipe including an upper pipe protruding above the floor slab, a lower pipe bonded to the lower part of the upper pipe, and an outer layer member (sometimes referred to as an outer layer cover) consisting of at least two layers provided on the outer circumference of the drainage collecting pipe from the lower part of the branch to the lower pipe, and particularly to a drainage collecting pipe provided with an outer layer member having a water-stopping property that satisfies a specific condition. In addition to such a drainage collecting pipe (itself), the present invention also includes a drainage collecting pipe (itself) in which the water-stopping property of the outer layer member has been confirmed quickly, easily, and reliably. In addition to such a drainage collecting pipe (itself), the present invention also includes a manufacturing method (of the drainage collecting pipe) including an inspection step for ensuring the water-stopping property of the outer layer member. Here, the term "(itself)" is used to clearly distinguish between a drainage collector pipe manufactured by a specific manufacturing method and a drainage collector pipe whose outer layer component has been guaranteed to have water-tightness by a specific inspection step (the outer layer component satisfies the water-tightness requirement), and means the drainage collector pipe itself (not specified by these methods). [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 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.

[0004] An example of such a resin drainage collecting pipe is the drainage pipe joint disclosed in JP 2020-094481 A (Patent Document 1). The drainage pipe joint disclosed in Patent Document 1 is formed of one or more resin injection molded products, and when installed in a building, includes a pipe body that is placed in a through hole of a floor slab, an upper riser pipe connection part that protrudes above the floor slab and connects a drainage riser pipe that flows in drainage from the upper floor, a lower riser pipe connection part that protrudes below the floor slab and connects a drainage riser pipe that flows down to the lower floor, and a horizontal branch pipe connection part that connects a drainage horizontal branch pipe above the floor slab, and is characterized in that a protrusion that protrudes from the inner surface of the pipe body is formed between the horizontal branch pipe connection part and the lower riser pipe connection part in the pipe body, a recess corresponding to the protrusion is formed on the outer surface of the pipe body, and a heat-expandable fireproof material is filled in the recess. In addition, the outer layer of the heat-expandable fire-resistant material is a three-layer member (outer layer member) having fire resistance and vibration suppression performance, and is characterized in that the outer layer member is provided on the outer surface of the pipe body in the following order from the outer surface of the pipe body: an innermost layer 710 of vibration-damping material, a middle layer of vibration insulator formed from fire-resistant inorganic fiber, and an outermost layer of sound-proof cover (Claims 1, 6, and 7 of Patent Document 1).

[0005] In the drainage pipe joint with the outer layer member disclosed in Patent Document 1, the joint (adhesive joint) between the outer layer member and the resin drainage pipe joint needs to have watertightness. If the watertightness is low, the soundproofing material in the outer layer member may get wet when rainwater accumulates on the upper floor, and soundproofing performance may not be fully demonstrated, or water from the upper floor may leak to the lower floor. Therefore, it is necessary to inspect the watertightness (including sampling inspection of the product or performance evaluation inspection of the prototype) before shipping. be.

[0006] Incidentally, regarding such watertightness inspection, there is a method disclosed in Japanese Patent Laid-Open Publication No. 10-307072 (Patent Document 2) (although it is not intended for the watertightness between a drainage collecting pipe and its outer layer member) for quickly and easily inspecting the quality of the attachment part, i.e., the presence or absence of leakage, when a flange joint for connecting pipes is attached to a container such as a tank. The leakage inspection method disclosed in Patent Document 2 is a leakage inspection method for inspecting leakage at the attachment part of at least two parts, and is configured by applying a viscous material that generates bubbles when air passes through it to the attachment part where one part is attached to the attachment surface of the other part, then surrounding the attachment part and placing a transparent cover in contact with the attachment surface of the one part, thereafter creating a negative pressure inside the cover, maintaining the negative pressure state inside the cover for a predetermined time, and visually inspecting the attachment part for the generation of bubbles at the attachment part where the viscous material is applied from outside the cover.

[0007] The technique disclosed in Patent Document 2, which detects water leakage from a polyethylene flange joint heat-sealed to a polyethylene tank by applying soapy water to the heat-sealed part, sealing the heat-sealed part with a transparent cover, drawing a vacuum, and detecting the leakage when the soapy water bubbles at the fused part, can also be applied to the water-stopping test of the outer layer member of a drainage collecting pipe, as shown in Figure 10. As shown in Figure 10(A), the drainage collecting pipe 1000 is sealed with a transparent cover 1010 including the pipe body (more specifically, the upper pipe 140 constituting the drainage collecting pipe 1000 and the lower pipe 110 bonded below the upper pipe) and the attachment part (in this invention, synonymous with the joint part or adhesive part) between the outer layer member 700 shown in Figure 10(B) (with the same reference numerals as in Figure 5(B)), and the transparent cover 1010 enclosing the drainage collecting pipe 1000 is vacuumed using a vacuum pump 1020, and it can be detected that the water-stopping property is not good when the soapy water bubbles at the attachment part. The attachment portion between the pipe body and the outer layer member 700 in the drainage collecting pipe 1000 has an upper water stop portion WP(U) and a lower water stop portion WP(D). The detailed configuration of the outer layer member 700 will be described in the embodiment with reference to FIG. [Prior art documents] [Patent documents]

[0008] [Patent Document 1] JP 2020-094481 A [Patent Document 2] Japanese Patent Application Publication No. 10-307072 Summary of the Invention [Problem to be solved by the invention]

[0009] However, when the watertightness of the outer layer member provided in the drainage pipe joint disclosed in Patent Document 1 is inspected using the leakage inspection method disclosed in Patent Document 2, even if it is possible, it is necessary to manufacture a transparent cover and to perform a vacuum extraction, which requires a great deal of cost and time for the watertightness inspection. Therefore, there is a demand for a drainage collecting pipe with an outer layer member and a method for inspecting the watertightness of the outer layer member in a drainage collecting pipe that can quickly, easily, and reliably confirm (inspect) the watertightness at the joint (bonded part) between the drainage collecting pipe (main body) and the outer layer member in a drainage collecting pipe with an outer layer member, but there is a problem that this has not been realized.

[0010] The present invention was developed in consideration of the above-mentioned problems, and its object is to provide a resinous drainage collector pipe to be installed in a through hole in the floor slab of a building, the drainage collector pipe including an upper pipe protruding above the floor slab, a lower pipe glued below the upper pipe, and an outer layer member consisting of at least two layers provided on the outer periphery of the drainage collector pipe from below the branch to the lower pipe, the drainage collector pipe (itself) provided with the outer layer member having water-stopping properties that satisfy specific conditions, and a method for manufacturing a drainage collector pipe that can quickly, easily, and reliably inspect the water-stopping properties of the outer layer member (including an inspection step to ensure the water-stopping properties of the outer layer member). [Means for solving the problem]

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

[0012] The present invention relates to a drainage collecting pipe made of resin, which is installed in a through hole of a floor slab of a building. The drainage collecting pipe includes an upper pipe that protrudes above the floor slab, a lower pipe below the upper pipe, and an outer layer member consisting of at least two layers that is provided on the outer periphery of the drainage collecting pipe from the lower branch to the lower pipe, the upper pipe includes an upper pipe connection part that connects an upper pipe that allows drainage water to flow in from the upper floor, and at least one horizontal branch pipe connection part that connects a horizontal branch pipe above the floor slab, the outer layer member includes an inner periphery side member and an outer periphery side member that is attached to the drainage collecting pipe so as to cover the outer periphery of the inner periphery side member, the inner periphery side member is not present at least at the upper end and the lower end of the outer periphery side member, the outer periphery side member is provided with a water stopper so as to prevent the inner periphery side member from coming into contact with water, and ... The device is attached to the drainage collecting pipe directly or by using another member, and is characterized in that a first state in which a first water pressure is applied to the upper end portion is continued until a first time has elapsed, a second state in which a second water pressure lower than the first water pressure is applied to the lower end portion is continued until a second time has elapsed, or a third state in which water is sprayed onto the lower end portion until a third time has elapsed, and it is determined that the water-stopping ability is good by confirming that there is no water intrusion from the upper end and the lower end after completion of the first state and the second state, after completion of the first state and the third state, or after completion of the first state, the second state, and the third state.

[0013] The drainage collecting pipe according to this aspect is a resin drainage collecting pipe installed in a through hole of a floor slab of a building, the drainage collecting pipe including an upper pipe protruding above the floor slab, a lower pipe below the upper pipe, and an outer layer member consisting of at least two layers provided on the outer periphery of the drainage collecting pipe from the bottom of the branch to the lower pipe, the upper pipe including an upper pipe connection portion connecting an upper pipe through which drainage water flows in from the upper floor, and at least one horizontal branch pipe connection portion connecting a horizontal branch pipe above the floor slab, the outer layer member including an inner periphery member and an outer periphery member attached to the drainage collecting pipe so as to cover the outer periphery of the inner periphery member, the inner periphery member not being present at least at the upper end and the lower end of the outer periphery member, the outer periphery member being attached to the drainage collecting pipe directly or by using another member with a water-stopping property to prevent the inner periphery member from coming into contact with water, and the drainage collecting pipe satisfies the following <Conditions>. <Conditions> A first state in which a first water pressure is applied to the upper end portion is continued until a first time has elapsed, a second state in which a second water pressure lower than the first water pressure is applied to the lower end portion is continued until a second time has elapsed, or a third state in which water is sprayed on the lower end portion is continued until a third time has elapsed, so that after completion of the first state and the second state, after completion of the first state and the third state, or after completion of the first state, the second state, and the third state, no water enters from the upper end and the lower end.

[0014] Preferably, the first state can be configured by preparing a water tank filled with water, with the upper pipe of the drainage collecting pipe facing downward, upside down from the state after installation on the floor slab, and immersing the drainage collecting pipe, including its upper end, in the water stored in the water tank to a depth where the distance from the upper end to the water surface corresponds to the first water pressure.

[0015] More preferably, the first time period may be 12 hours and the first water pressure may be 200 mm head.

[0016] More preferably, the second state can be configured by preparing a water tank filled with water, with the upper pipe of the drainage collecting pipe facing upward, in the same up and down state as after installation on the floor slab, and immersing the drainage collecting pipe, including its lower end, in the water stored in the water tank to a depth where the distance from the lower end to the water surface corresponds to the second water pressure.

[0017] More preferably, the second time period is 12 hours and the second water pressure is 35 mm head.

[0018] More preferably, the third state can be configured by preparing a sprinkler filled with water, with the upper pipe of the drainage manifold facing downward, in a state upside down from when it is installed on the floor slab, and spraying water onto the lower end portion with the sprinkler.

[0019] More preferably, the third period is 100 seconds, and the amount of water sprayed per second is 100 cm 3 It can be configured such that:

[0020] More preferably, the absence of water intrusion can be confirmed by checking the change in weight of the drain collecting pipe before and after the completion of the above state, by cutting the tubular outer layer member along the axis of the drain collecting pipe and opening it up to check the inner side member, or by pulling the tubular outer layer member out along the axis of the drain collecting pipe while still in its cylindrical form to check the inner side member.

[0021] More preferably, a moisture detection material that is altered by moisture or humidity can be provided between the outer peripheral member and the inner peripheral member, and the absence of water intrusion can be confirmed to be due to the absence of alteration of the moisture detection material.

[0022] In order to achieve the above object, a manufacturing method for a drainage collecting pipe according to 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 having an outer layer member, the manufacturing method includes an inspection step for ensuring watertightness of the outer layer member, the drainage collecting pipe includes an upper pipe protruding above the floor slab, a lower pipe below the upper pipe, and an outer layer member consisting of at least two layers provided on the outer periphery of the drainage collecting pipe from below a horizontal branch pipe connection part to the lower pipe, the upper pipe includes an upper pipe connection part connecting an upper pipe through which wastewater flows in from an upper floor, and at least one horizontal branch pipe connection part connecting a horizontal branch pipe above the floor slab, the outer layer member includes an inner periphery side member, and an outer periphery side member attached to the drainage collecting pipe so as to cover the outer periphery of the inner periphery side member, and the manufacturing method includes a step of molding a resin part included in the drainage collecting pipe with resin. a resin preparation step of preparing the drainage collecting pipe by using the resin parts or by transporting and preparing the resin parts; an assembly step of assembling the drainage collecting pipe using the resin parts; an outer layer member attachment step of attaching the outer periphery side member to the drainage collecting pipe directly or by using another member so that the inner periphery side member is not present at least at the upper end and the lower end of the outer periphery side member and so that the inner periphery side member has a water stoppage property of not contacting water; and an inspection step for ensuring the water stoppage property of the outer layer member provided in the drainage collecting pipe, the inspection step including a water immersion step of immersing the drainage collecting pipe, including the upper end portion, in water until a predetermined time has elapsed, up to a predetermined depth from the upper end to the water surface; and a judgment step of judging that the water stoppage property is good by confirming that no water has entered from the upper end after the water immersion step is completed. Effect of the Invention

[0023] According to the present invention, it is possible to provide a resinous drainage collector pipe to be installed in a through hole in the floor slab of a building, the drainage collector pipe including an upper pipe protruding above the floor slab, a lower pipe glued below the upper pipe, and an outer layer member consisting of at least two layers provided on the outer periphery of the drainage collector pipe from below the branch to the lower pipe, the drainage collector pipe (itself) provided with the outer layer member having water-stopping properties that satisfy specific conditions, and a manufacturing method for the drainage collector pipe that allows the water-stopping properties of the outer layer member to be quickly, easily, and reliably inspected (including an inspection step to ensure the water-stopping properties of the outer layer member). [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 700, and (B) is a perspective view showing a state in which the drainage collection pipe 100 does not have an outer layer member 700. [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] FIG. 2 is a two-sided view of a drainage collecting pipe 100 according to an embodiment of the present invention. [Diagram 5] (A) A cross-sectional view of 5A-5A in Figure 4(A), (B) an enlarged cross-sectional view of the outer layer member 700 in Figure 5(A), (C) an enlarged cross-sectional view of the outer layer member 700 in Figure 5(B) when the outer layer member 700 is attached to the upper tube 140 via a rubber ring 900, and (D) a partial cross-sectional view of 5A-5A when the thermally expandable fire-resistant material 116 is not filled. [Figure 6] FIG. 1 is a diagram (part 1) for explaining a method for inspecting the watertightness of an outer layer member in a drainage collecting pipe according to an embodiment of the present invention. [Figure 7]FIG. 2 is a diagram (part 2) for explaining the method for inspecting the watertightness of the outer layer member in the drainage collecting pipe according to the embodiment of the present invention. [Figure 8] FIG. 3 is a diagram (part 3) for explaining the method for inspecting the watertightness of the outer layer member in the drainage collecting pipe according to the embodiment of the present invention. [Figure 9] FIG. 4 is a diagram (part 4) for explaining the method for inspecting the watertightness of the outer layer member in the drainage collecting pipe according to the embodiment of the present invention. [Figure 10] FIG. 1 is a diagram for explaining a conventional technique. [Figure 11] FIG. 1 is a diagram (part 1) for explaining features of a drainage manifold (itself) according to an embodiment of the present invention. [Figure 12] 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] Below, a detailed description will be given of a drainage collecting pipe (itself) 100 according to an embodiment of the present invention, and a method for manufacturing a drainage collecting pipe including an inspection step for ensuring the water-tightness of the outer layer member of the drainage collecting pipe 100 (more specifically, in an outer layer member including an inner side member and an outer side member attached to the drainage collecting pipe 100 so as to cover the outer periphery of the inner side member, the inner side member is not present at least at the upper and lower ends of the outer side member, and the inner side member does not come into contact with water).

[0026] Here, the drainage collecting pipe according to the present invention is a drainage collecting pipe having a technical feature that can confirm that there is no water intrusion from the upper water stopping part WP(U) at the upper end side and the lower water stopping part WP(D) at the lower end side of the outer layer member (sometimes described without distinguishing it from the outer layer cover) 700 by the water stopping inspection method described later (and furthermore, it is judged that the water stopping is good because no water intrusion has been confirmed) (the technical feature of the drainage collecting pipe itself is the water stopping of this outer layer member, and the technical feature of the drainage collecting pipe itself is the water stopping of this outer layer member as a technical feature that cannot be realized by the outer layer member alone or the drainage collecting pipe alone excluding the outer layer member). In other words, the greatest feature of the drainage collecting pipe according to the present invention is that the drainage collecting pipe itself has the water stopping of the outer layer member, which cannot be realized by the outer layer member alone or the drainage collecting pipe alone excluding the outer layer member, in a drainage collecting pipe with an outer layer member, as a technical feature that the drainage collecting pipe itself has by satisfying the conditions described later.

[0027] Moreover, such a drainage collecting pipe includes a resin preparation step of preparing the resin parts included in the drainage collecting pipe by resin molding or by transporting and preparing the resin parts; an assembly step of assembling the drainage collecting pipe using the resin parts; an outer layer member attachment step of attaching the outer peripheral side member to the drainage collecting pipe directly or using another member so that there is no inner peripheral side member at least at the upper and lower ends of the outer peripheral side member and so that the inner peripheral side member is provided with a water-stopping property of not coming into contact with water; and an inspection step for ensuring the water-stopping property of the outer layer member provided in the drainage collecting pipe, the inspection step including a water immersion step of immersing the drainage collecting pipe, including the upper end portion, in water until a predetermined time has elapsed to a predetermined depth from the upper end to the water surface; and a judgment step (including the inspection step) of determining that the water-stopping property is good by confirming that no water has entered from the upper end after the water immersion step is completed. For this reason, the manufacturing method of the drainage collection pipe of the present invention is a manufacturing method that includes at least a resin preparation step, an assembly step, an outer layer member attachment step, and an inspection step (including a water immersion step and a judgment step) (this inspection step is referred to as inspection step A) (regardless of whether the inspection step is performed on all products, random inspection of products, or incorporation into performance inspection of prototypes).

[0028] Here, by replacing this inspection step A, an inspection step B can be provided that includes a water immersion step in which the drainage manifold, including the lower end portion, is immersed in water for a predetermined time until the distance from the lower end to the water surface reaches a predetermined depth, and a judgment step in which, after the water immersion step is completed, it is confirmed that no water has entered from the lower end and thereby judged that the water-stopping ability is good. In addition, it is also possible to replace this inspection step A with an inspection step C including a water-spraying step of spraying water on the lower end portion with a water sprinkler filled with water, and a judgment step of judging that the water-stopping ability is good by confirming that no water has entered from the lower end after the water-spraying step is completed. Furthermore, the inspection step may be any one of the inspection steps A, B, and C, any two of them, or all three of them.

[0029] The greatest feature of the manufacturing method for a drainage collection pipe according to the present invention is that, in a drainage collection pipe having an outer layer member, the water-tightness of the outer layer member, which cannot be achieved by the outer layer member alone or by the drainage collection pipe alone excluding the outer layer member, is provided as a technical feature of the drainage collection pipe itself by confirming in an inspection step that the water-tightness of the outer layer member satisfied the [conditions for the water-tightness of the outer layer member satisfied by the drainage collection pipe (itself)] described below.

[0030] 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 easily understand the present invention, the direction of the horizontal branch pipe may be specified using the hour hands of a clock as 0 o'clock, 3 o'clock, 6 o'clock, and 9 o'clock (FIG. 4). In addition, the symbols (consisting of numbers and (if necessary) letters) attached to the dashed dotted lines in the figures indicate the figure number with the numbers and the branch number (A, B, C, etc.) in the figures, and the figures identified by the symbols show cross-sectional views (FIG. 4(A), FIG. 5(A)). [Overall configuration of drainage manifold] 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 FIG. 1 to FIG. 5, 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) that is 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 in a building, and for example, a resin-made one corresponds to this. In addition, although it is optional, it is also preferable that the multiple resin-made parts that constitute the drainage collecting pipe 100 include a part that uses a resin with excellent impact resistance. Here, the drainage collecting pipe including a part using resin with excellent impact resistance is a drainage collecting pipe including a part molded from resin by mixing 1 to 20 parts by weight of impact-resistant improved resin (reinforcement agent) with 100 parts by weight of PVC resin. More specifically, (multiple) resin parts (here, as an example, at least one of six parts, the upper pipe 140, the lower pipe 110, the upper pipe receiving member 144, and the horizontal branch pipe receiving member 146 x 3) are molded from resin by mixing 1 to 20 parts by weight of PVC resin with 100 parts by weight. In addition, although optional, it is also preferable to make the multiple resin parts constituting the drainage collecting pipe 100 include a part using resin with excellent impact resistance. Here, the drainage collecting pipe including a part using resin with excellent impact resistance is a drainage collecting pipe including a part molded from resin by mixing 1 to 20 parts by weight of impact-resistant 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.

[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 components are provided: an upper pipe 140, a lower pipe 110, an upper pipe receiving member 144, and three horizontal branch pipe receiving members 146). As shown in FIGS. 1 to 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 the drainage collector pipe 100 is formed above the floor slab. The lower pipe 110 includes an upper pipe 140 protruding toward the floor below the upper pipe 140, 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 bonded 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 is bonded for connecting a horizontal branch pipe above the floor slab. The lower pipe 110 includes a lower pipe connection part 130 to which a lower pipe 230 through which wastewater flows out to the lower floor is connected. Resin receiving members (more specifically, an upper pipe receiving member 144 and a horizontal branch pipe receiving member 146) are bonded to the upper pipe connection part 143 and the horizontal branch pipe connection part 142, respectively.

[0032] Here, when the drainage collecting pipe 100 is not for the lowest floor, as shown in Figures 3(A) and 3(B), as an example, a swirl vane 114 is formed as a protruding part protruding from the inner surface of the lower pipe 110 above the lower pipe connection part 130 in the lower pipe 110, and a recess 112 corresponding to this protruding part (here, the swirl vane 114) is formed on the outer surface of the lower pipe 110, and the thermally expandable fireproof material 116 is filled in the recess 112. Note that filling the recess 112 with the thermally expandable fireproof material 116 is an optional matter in the drainage collecting pipe according to the present invention, and as shown in Figure 5(D) described later, a drainage collecting pipe according to the present invention may be a drainage collecting pipe in which the recess 112 is not filled with the thermally expandable fireproof material 116. 5(D), in addition to the depression 112 not being filled with the thermal expansion material 116, the thermal expandable fire-resistant material 712 is provided only at one upper location, not at two upper and lower locations, and a vibration-damping material 714 is provided at the lower location where the thermal expandable fire-resistant material 712 was provided. A drainage collecting pipe in which the thermal expandable fire-resistant material 712 is provided only at one upper location, not at two upper and lower locations (the thermal expandable fire-resistant material and the swirl vanes do not overlap in the height direction) may be the drainage collecting pipe according to the present invention.

[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 the outer layer of the thermally expandable fireproof material 116 is provided with an outer layer member 700 having fire resistance and vibration suppression properties, which is wrapped around the outer periphery of the lower pipe 110 in a cylindrical shape, and this outer layer member 700 may cover the lower part of the upper pipe 140 in a cylindrical shape. The outer layer member 700 will be described with reference to the two-sided view of the drainage collecting pipe 100 shown in FIG. 4 and the cross-sectional view shown in FIG. 5. As shown in these figures, an example of the outer layer member 700 has a three-layer structure, and is provided so as to cover the outer periphery of the lower pipe 110, including the case where it covers the lower part of the upper pipe 140 of the drainage collecting pipe 100, in this order from the outer surface of the drainage collecting pipe 100, including the case where it covers the lower part of the upper pipe 140 of the drainage collecting pipe 100. As an example, the vibration-damping material 714 of the innermost layer 710 is formed containing a butyl-based (butyl rubber, etc.) or asphalt-based (rubber asphalt, modified asphalt, etc.) material, the sound-insulating cover 730 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 720 formed of fire-resistant inorganic fibers in the middle layer is formed from an aggregate of fire-resistant inorganic fibers (glass wool, rock wool, ceramic fiber, etc.). Note that a thermally expandable fire-resistant material 712 is provided in place of the vibration-damping material 714 in the innermost layer 710. In other words, the three-layered outer layer member 700 is composed of a thermally expandable fire-resistant material 712 or a vibration-damping material 714 in the innermost layer 710, a vibration insulator 720 in the middle layer, and a sound-insulating cover 730 in the outermost layer. However, except for the fact that the outer layer member 700 has a structure of two or more layers, the fact that the outer layer member 700 has a three-layered structure and that it is formed from such materials is not limited to the present invention.

[0036] 3(A) and 4, 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, the number of side branch pipe connection sections is not limited, and although not limited, the side branch pipe receiving member 146 may be one that connects a side branch pipe without reducing its diameter (side branch pipe receiving member shown in the figure) or one that connects a side branch pipe with a reduced diameter.

[0037] Furthermore, in the manufacturing plant for this drainage collecting pipe 100, the drainage collecting pipe 100 is formed from the six resin injection-molded products shown in Fig. 3(A) as described above, and the joints between these separate injection-molded products shown in Fig. 3(A) are bonded with an adhesive. Here, although not directly related to the present invention, the letter M immediately following the number of the reference numeral in Fig. 3(A) indicates the male side, and the letter F indicates the female side. Note that the present invention is not limited to the number and shape of the injection-molded products that make up the drainage collecting pipe, but is preferably applied to a drainage collecting pipe having the following configuration.

[0038] The drainage collecting pipe according to the present invention has the following configuration. This drainage collecting pipe 100 is a resin drainage collecting pipe that is installed in a through hole in the floor slab of a building as shown in Fig. 1. As shown in Figs. 1 to 5, this drainage collecting pipe 100 includes an upper pipe 140 that protrudes above the floor slab, a lower pipe 110 that is bonded below the upper pipe 140, and an outer layer member 700 consisting of at least two layers (three layers in this case) that is provided on the outer periphery from the lower branch of the drainage collecting pipe 100 (the lower branch refers to the vicinity immediately below the horizontal branch pipe connecting portion 142 of the upper pipe 140) to the lower pipe 110. This upper pipe 140 includes an upper pipe connection part 143 that connects 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 that connects a horizontal branch pipe above the floor slab, and a resin upper pipe receiving member 144 is bonded to the upper pipe connection part 143, and a resin horizontal branch pipe receiving member 146 is bonded to the horizontal branch pipe connection part 142. Also, as shown in Fig. 5(A) (only), the drainage collecting pipe 100 may be provided with a rubber ring 144G on the upper pipe receiving member 144 and a rubber ring 146G on the horizontal branch pipe receiving member 146, respectively (as optional configurations).

[0039] The outer layer member 700 of the drainage collecting pipe 100 includes an inner side member (here, the heat-expandable fire-resistant material 712 or vibration-damping material 714 of the innermost layer 710, and the vibration insulator 720 of the middle layer) and an outer side member (here, the sound-insulating cover 730 of the outermost layer) that is attached to the drainage collecting pipe 100 so as to cover the outer periphery of the inner side member, and the inner side member (heat-expandable fire-resistant material 712 or vibration-damping material 714 and vibration insulator 720) is not present at least at the upper end (which will form the upper water-stopping portion WP(U)) and lower end (which will form the lower water-stopping portion WP(D)) of the outer side member (sound-insulating cover 730), and the outer side member (sound-insulating cover 730) has water-stopping properties to prevent the inner side member from coming into contact with water and is attached to the upper pipe 140 and lower pipe 110 of the drainage collecting pipe 100 directly, as shown in Figure 5(B), or using a rubber ring 900, which is another member, as shown in Figure 5(B). Here, the inner peripheral member (particularly the aggregate of inorganic fibers preferably used as the vibration insulator 720) has a property that its function is reduced when it comes into contact with water. For this reason, to ensure water-stopping properties, more specifically, but not limited to, the outer peripheral member (sound insulation cover 730) is attached to the upper pipe 140 and the lower pipe 110 of the drainage collecting pipe 100 (and further via the rubber ring 900) with an adhesive to provide water-stopping properties.

[0040] The present invention relates to a drainage collecting pipe including an upper pipe protruding above a floor slab, a lower pipe below the upper pipe, and an outer layer member consisting of at least two layers provided on the outer periphery of the drainage collecting pipe from the branch to the lower pipe, and the outer layer member is an inner periphery side member and a layer covering the outer periphery of the inner periphery side member. The drainage collecting pipe (itself) includes an outer peripheral side member attached to the drainage collecting pipe as described above, at least at the upper and lower ends of the outer peripheral side member, no inner peripheral side member is present, the outer peripheral side member is provided with water-stopping properties so as to prevent the inner peripheral side member from coming into contact with water, and the outer layer member is attached to the drainage collecting pipe directly or using another member, and the water-stopping properties of the outer layer member can be confirmed to be good. As described below, the method includes a resin preparation step of preparing resin parts included in the drainage collecting pipe by resin molding or by transporting and preparing resin parts, an assembly step of assembling the drainage collecting pipe using the resin parts, and a drainage collecting pipe (itself) in which the outer peripheral side member is provided with an inner peripheral side member at least at the upper and lower ends of the outer peripheral side member, and the outer peripheral side member is provided with a water-stopping properties so as to prevent the inner peripheral side member from coming into contact with water. The present invention is directed to a method for manufacturing a drainage collecting pipe, which includes an outer layer member attachment step of attaching an outer peripheral member to the drainage collecting pipe directly or by using another member so that the outer peripheral member is not present and has water-tightness that does not allow the inner peripheral member to come into contact with water, and an inspection step of ensuring the water-tightness of the outer layer member provided on the drainage collecting pipe, the inspection step including a water immersion step of immersing the drainage collecting pipe, including its upper end portion, in water until a predetermined time has elapsed to a predetermined depth from the upper end to the water surface, and a determination step of determining that the water-tightness is good by confirming that no water has entered from the upper end after the water immersion step is completed (including the inspection step). [Conditions for the outer layer material of the drainage manifold (itself) to satisfy] In the following, the drainage collecting pipe according to the present invention is characterized in that it satisfies the following conditions in addition to the above-mentioned configuration. The conditions that the drainage collecting pipe (itself) according to the present invention satisfies are: (1) As shown in FIG. 6, a first state in which a first water pressure is applied to the upper end portion (the upper water stop portion WP(U)) of the outer peripheral member (sound-insulating cover 730) of the outer layer member 700 is continued until a first time period has elapsed, (2) A second state in which a second water pressure lower than the first water pressure is applied to the lower end portion (the lower water stop portion WP(D)) of the outer peripheral side member (sound insulation cover 730) of the outer layer member 700 is continued until a second time has elapsed as shown in FIG. 7, or a third state in which water is sprayed on the lower end portion (the lower water stop portion WP(D)) of the outer peripheral side member (sound insulation cover 730) of the outer layer member 700 until a third time has elapsed as shown in FIG. (4) (4-1) After completion of the first state and the second state, (4-2) After completion of the first state and the third state, or (4-3) After completion of the first state, the second state, and the third state, there is no (no) intrusion of water from the upper end portion (the upper water-stopping portion WP(U)) and the lower end portion (the lower water-stopping portion WP(D)) of the outer peripheral member (sound-insulating cover 730) of the outer layer member 700. These are the conditions, and the drainage collecting pipe according to the present invention is characterized as being a drainage collecting pipe that satisfies these conditions.Furthermore, the drainage collecting pipe according to the present invention is characterized as being a drainage collecting pipe that has been determined to have good water-stopping properties because no water intrusion has been confirmed in this way.The subject of the present invention is a drainage collecting pipe (itself) that satisfies these conditions, and a method for inspecting whether or not this condition is satisfied is an inspection method, and this inspection method corresponds to an inspection step in a manufacturing method for a drainage collecting pipe, which will be described later.

[0041] From here, the above-mentioned conditions will be explained in more detail. First, the water pressure in the first time and the first state will be explained in detail. In this first state, as shown in FIG. 6, a water tank 800 storing water W is prepared, and the upper pipe 140 of the drainage collecting pipe 100 is placed downward, and the drainage collecting pipe is immersed in the water W stored in the water tank 800 until the first time has elapsed, with the upper end part (the part of the upper water stop part WP(U)) of the outer peripheral member (sound insulation cover 730) of the outer layer member 700 being immersed in the water W stored in the water tank 800 until the distance from the upper end part (the part of the upper water stop part WP(U)) to the water surface corresponds to the first water pressure. Here, the first time in the condition satisfied by the drainage collecting pipe according to the present invention is 12 hours, and the first water pressure is 200 mm head. Here, the reason why the first water pressure is 200 mm head will be explained with reference to FIG. 9. FIG. 9 shows a side view of the drainage collecting pipe installed on a stepped floor slab. When a drainage collecting pipe is installed in such a stepped floor slab, the upper end portion (upper water stopper portion WP(U)) of the outer peripheral member (sound insulation cover 730) of the outer layer member 700 will be submerged in water up to a depth of about 200 mm (almost the maximum step in the stepped slab). Taking into account this situation, the first water pressure is set at 200 mm head.

[0042] Next, the second time and the water pressure in the second state will be described in detail. In this second state, as shown in Fig. 7, a water tank 800 storing water W is prepared, and the upper pipe 140 of the drainage collecting pipe 100 is placed upward, in the same up-down state as after installation on the floor slab, and the drainage collecting pipe including the lower end part (the lower water stop part WP(D) part) of the outer peripheral member (sound insulation cover 730) of the outer layer member 700 is immersed in the water W stored in the water tank 800 until the second time has elapsed, to a depth corresponding to the second water pressure from the lower end part (the lower water stop part WP(D) part) to the water surface. Here, the second time under the conditions satisfied by the drainage collecting pipe according to the present invention is 12 hours, and the second water pressure is 35 mm head (lower than the first water pressure). The reason why the second water pressure is lower than the first water pressure is that, as explained with reference to Figure 9, the lower end portion (the lower water-stopping portion WP(D) portion) of the outer peripheral member (sound-insulating cover 730) of the outer layer member 700 may be exposed to rainwater and other liquids entering the lower end portion and coming into contact with the rainwater, etc., but will not be submerged in water to a depth of 200 mm like the upper end portion (the upper water-stopping portion WP(U) portion) of the outer peripheral member (sound-insulating cover 730) of the outer layer member 700, even when installed on a stepped floor slab.

[0043] Next, the water pressure (spraying) during the third time and the third state will be described in detail. In this third state, a water sprinkler 810 filled with water is prepared, and the upper pipe 140 of the drainage collecting pipe 100 is placed downward, which is upside down from the state after installation on the floor slab, and water is sprayed from the water sprinkler 810 on the lower end portion (the portion of the lower water stop portion WP(D)). Here, the third time is 100 seconds, and the amount of water sprayed per second is 100 cm3. 3The third time and the third state, like the second time and the second state described above, are conditions that the drainage collecting pipe 100 has regarding the water stoppage of the lower end portion (the lower water stoppage portion WP(D) portion) of the outer peripheral side member (sound insulation cover 730) of the outer layer member 700, and are conditions that the drainage collecting pipe according to the present invention satisfies because the upper end portion (the upper water stoppage portion WP(U) portion) of the outer peripheral side member (sound insulation cover 730) of the outer layer member 700 is not submerged in water to a depth of 200 mm even when installed on a stepped floor slab, and the conditions regarding the water stoppage can be applied using the third state, which is the water spraying state, as the conditions regarding the water stoppage of the outer layer member 700.

[0044] With regard to the second state and second time, as well as the third state and third time, it can also be said that they are assuming that rainwater will splash on them, because even when the drainage collecting pipe of the present invention is installed on a stepped floor slab, it cannot be assumed that the lower end portion (the lower water-stopping portion WP(D) portion) of the outer layer member 700's outer peripheral member (sound-insulating cover 730) will be immersed in water up to a depth of approximately 200 mm.

[0045] The condition that the drainage collecting pipe according to the present invention must satisfy is that (4-1) after completion of the first and second states, (4-2) after completion of the first and third states, or (4-3) after completion of the first, second, and third states, there is no (no) intrusion of water from the upper end portion (upper water stop portion WP(U) portion) of the outer peripheral member (sound insulation cover 730) of the outer layer member 700 and the lower end portion (lower water stop portion WP(D) portion) of the outer peripheral member (sound insulation cover 730) of the outer layer member 700. The condition that the drainage collecting pipe according to the present invention satisfies, that there is no (no) intrusion of water from the upper water stop portion WP(U) portion and the lower water stop portion WP(D) portion, will be described in detail. The absence of water intrusion under the conditions satisfied by the drainage collector pipe of the present invention can be confirmed by (A) checking the change in weight of the drainage collector pipe 100 before and after the completion of each state (before and after the first state is continued for a first period of time, before and after the second state is continued for a second period of time, before and after the third state is continued for a third period of time with respect to the amount of water sprayed per unit time, and before and after a combination of these states is executed), (B) cutting the cylindrical outer layer member 700 along the axial center (direction) of the drainage collector pipe 100 and cutting it open to check the inner peripheral members (the thermally expandable fire-resistant material 712 or the vibration-damping material 714 and the vibration insulator 720), or (C) pulling out the cylindrical outer layer member 700 while still in its cylindrical form along the axial center (direction) of the drainage collector pipe 100 to check the inner peripheral members (the thermally expandable fire-resistant material 712 or the vibration-damping material 714 and the vibration insulator 720). In this case, a moisture detection material that changes due to moisture or humidity is provided between the outer peripheral member (sound insulation cover 730) and the inner peripheral member (thermal expandable fireproof material 712 or vibration damping material 714 and vibration insulator 720), and the absence of water intrusion is considered to be moisture. It is important to ensure that the moisture detection material is not denatured. Examples of materials that are denatured by moisture or humidity and that are suitable for use as the moisture detection material include microcapsules, silica gel, cobalt chloride hexahydrate, and other materials that change color due to moisture or humidity, and absorbent sheets, water-soluble sheets, and other materials that change (change in shape) due to moisture or humidity. Thus, the denaturation (change in properties) in the present invention includes, but is not limited to, discoloration that changes color and alteration that changes shape. [Inspection method for drainage manifold (watertightness)] The method for inspecting the watertightness (of the outer layer member 700 in the drainage collecting pipe 100) according to the present invention (hereinafter, may be simply referred to as the watertightness inspection method) will be described in detail below. This watertightness inspection method inspects the watertightness of the outer layer member 700 of the drainage collecting pipe 100 having the above-mentioned configuration (the drainage collecting pipe formed of six resin injection molded products and the outer layer member with a three-layer structure attached thereto, etc.).

[0046] <First inspection step: Water immersion step of inspection step A> As shown in Figure 6, a water tank 800 containing water W is prepared, and the upper pipe 140 of the drainage collector pipe 100 is immersed in the water stored in the water tank 800 until 12 hours have elapsed, with the upper pipe 140 facing downward and upside down from the state after it is installed on the floor slab, to a depth of 200 mm from the upper end portion (the upper end portion (the upper end portion of the outer peripheral member (sound-insulating cover 730) of the outer layer member 700 (the upper water-stopping portion WP(U))) corresponding to the first water pressure of 200 mm head to the water surface.

[0047] <Second inspection step: Water immersion step of inspection step B> As shown in Figure 7, a water tank 800 containing water W is prepared, and the upper pipe 140 of the drainage collector pipe 100 is placed with the upper pipe 140 facing upward, in the same upside and down position as after installation on the floor slab, and the drainage collector pipe 100, including its lower end portion, is immersed in the water stored in the water tank 800 until 12 hours have elapsed, to a depth of 35 mm from the lower end portion (the lower end portion of the outer peripheral member (sound-insulating cover 730) of the outer layer member 700 (the portion of the lower water-stopping portion WP(D))) corresponding to the second water pressure of 35 mm head to the water surface.

[0048] <Third inspection step: Watering step of inspection step C> As shown in FIG. 8, a sprinkler 810 filled with water was prepared, and the upper pipe 140 of the drainage collecting pipe 100 was placed downward, and the water was sprinkled at a rate of 100 cm per second in a state upside down after installation on the floor slab. 3 The lower end portion (lower stop) of the water sprinkler 810 is kept in the water for 100 seconds. Water is sprayed onto the water section WP(D).

[0049] <Decision step: Decision step for inspection steps A, B, and C> After the first and second inspection steps are completed, or after the first, second and third inspection steps are completed, or after the first, second and third inspection steps are completed, the cylindrical outer layer member 700 is cut and opened along the axial center (direction) of the drainage collecting pipe 100 so that the inner peripheral side members (thermally expandable fireproof material 712 or vibration damping material 714 and vibration insulator 720) can be confirmed, or the cylindrical outer layer member 700 is left in its cylindrical form and opened along the axial center (direction) of the drainage collecting pipe 100 so that the inner peripheral side members (thermally expandable fireproof material 712 or vibration damping material 714 and vibration insulator 720) can be confirmed. The water-stopping ability is determined to be good by removing the drain collector pipe 100 along the line so that the inner peripheral component (thermally expandable fire-resistant material 712 or vibration-damping material 714 and vibration insulator 720) can be checked, and confirming that the moisture detection material, which is degraded by moisture or humidity and is provided between the outer peripheral component (sound-insulating cover 730) and the inner peripheral component (thermally expandable fire-resistant material 712 or vibration-damping material 714 and vibration insulator 720), has not been degraded, or by confirming the change in weight of the drain collector pipe 100 before and after the completion of the state. [Manufacturing method of drainage manifold] Hereinafter, a method for manufacturing a drainage collector pipe 100 according to an embodiment of the present invention will be described with reference to the above-mentioned [(Watertightness) Inspection Method for Drainage Collector Pipe]. This manufacturing method is a method for manufacturing a resin drainage collector pipe 100 that is placed in a through hole in the floor slab of a building. This drainage collector pipe 100 has an outer layer member, and this manufacturing method includes an inspection step for ensuring the watertightness of this outer layer member. This drainage collector pipe 100 has an upper pipe that protrudes above the floor slab, a lower pipe below the upper pipe, and a pipe that is fitted around the outer periphery of the drainage collector pipe from below the horizontal branch pipe connection part to the lower pipe. The upper pipe includes an upper pipe connection portion that connects an 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 outer layer member includes an inner periphery side member and an outer periphery side member that is attached to the drainage collecting pipe so as to cover the outer periphery of the inner periphery side member.

[0050] The manufacturing method of the drainage collecting pipe 100 includes an inspection step for ensuring the watertightness of the outer layer member, as described above. In addition to the inspection step, the manufacturing method of the drainage collecting pipe 100 includes a resin preparation step for preparing the resin parts included in the drainage collecting pipe by resin molding or by transporting and preparing the resin parts, an assembly step for assembling the drainage collecting pipe using the resin parts, an outer layer member attachment step for attaching the outer periphery side member to the drainage collecting pipe directly or using another member so that the inner periphery side member is not present at least at the upper end and lower end of the outer periphery side member and has a watertightness of not contacting the inner periphery side member with water, and an inspection step for ensuring the watertightness of the outer layer member included in the drainage collecting pipe. This inspection step includes a water immersion step for immersing the drainage collecting pipe, including the upper end portion, in water until a predetermined time has elapsed, up to a predetermined depth from the upper end to the water surface, and a judgment step for judging that the watertightness is good by confirming that no water has entered from the upper end after the water immersion step is completed. 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. [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.).

[0051] 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.

[0052] Furthermore, the drainage collecting pipe 100 according to the present invention (particularly the receiving member) has a portion with a thicker wall thickness. Specifically, compared to the original wall thickness T, there is a portion (width 0.5T or more) with a thicker wall thickness (1.1T or more). As a specific example, as shown in FIG. 11, The drain collector pipe (itself) for which adhesion has been confirmed at the adhesive joints including this part (the adhesive joint between the upper pipe 140 and the lower pipe 110, and the adhesive joint between the upper pipe 140 and the receiving parts (the upper pipe receiving part 144 and the horizontal branch pipe receiving part 146)) is the drain collector pipe according to the present invention. In particular, there are cases where the outer layer member is attached to a resin (injection) molded part with oil remaining on it from the molding process, which can cause adhesion problems at the joints where parts are bonded together (here, the joint between upper pipe 140 and lower pipe 110, and the joint between upper pipe 140 and the receiving member (upper pipe receiving member 144 and side branch pipe receiving member 146)) with the oil remaining on them, but this possibility is avoided or suppressed in the drain collecting pipe of the present invention. Also, the center of the (circular) adhesive part in the receiving member (upper pipe receiving member 144 and side branch pipe receiving member 146) is misaligned with the center of the (circular) receiving port in the drain collecting pipe, so that if the receiving port part is pressed into the receiving port during bonding, the part may tilt due to the misalignment with the adhesive part, which can cause adhesion problems, but this possibility is avoided or suppressed in the drain collecting pipe of the present invention.

[0053] Furthermore, the drainage collecting pipe 100 according to the present invention has a bonding portion between the upper pipe 140 and the lower pipe 110, a bonding portion between the side branch pipe connecting portion 142 of the upper pipe 140 and the side branch pipe receiving member 146, and a bonding portion between the upper pipe connecting portion 143 of the upper pipe 140 and the upper pipe receiving member 144. In these bonding portions, the bonding strength of the bonding portion 24 hours after bonding is 0.5 MPa or more as the bonding performance. This bonding strength is calculated by dividing the maximum load in a tensile test (10 mm / min) by the area of ​​the bonding portion. And the drainage collecting pipe (itself) in which the bonding strength of these bonding portions (24 hours after bonding) is 0.5 MPa or more is the drainage collecting pipe according to the present invention.

[0054] 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.

[0055] Furthermore, in the case 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 going to the trouble of widening it). In this way, although it is disadvantageous in terms of water-stopping because it is not a tight fit (it becomes a factor that hinders water-stopping), it is preferable to use a sound-insulating cover that is not too tightly fitted to the drainage collecting pipe 100 and the sound-insulating cover. The drain collector pipe 100 (itself) has a water-stopping property to prevent water from entering between it and the outer layer member 700. The drain collector pipe (itself) that has been confirmed to have this water-stopping property is the drain collector 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 the parts are bonded together while the oil remains (in this case, if the outer layer member is bonded to the drain collector pipe), there is a possibility that poor adhesion may occur, but such a possibility is avoided or suppressed in the drain collector pipe of the present invention.

[0056] 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.

[0057] The drainage collecting pipe according to the present invention, which is composed of the upper pipe 140, the lower pipe 110, and the receiving member (the horizontal branch pipe receiving member 146 and the upper pipe receiving member 144), is a resin molded product, and due to the fact that there are places where the chamfering at the corners is small (more specifically, R0.1 to R0.3), when the drainage collecting pipe is dropped, stress is concentrated at the places where the chamfering is small, and this becomes the starting point of cracks (breakage). For example, as shown in FIG. 12, an example of such a place is the chamfered portion 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 portion 110ER at its bottom, a force is applied that expands 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.

[0058] 12 described above, stress tends to concentrate when the chamfer at the bottom of the socket is small (R0.1 or more and R0.3 or less) in the resin molded product (on the socket side) into which the spigot side is inserted and attached, and when the chamfer at the bottom of the socket is small (R0.1 or more and R0.3 or less), stress tends to concentrate in that area when the drainage collecting pipe is dropped, causing a crack to start and resulting in damage (to the socket of the resin molded product on the socket side). The drainage collecting pipe (itself) according to the present invention is characterized in that the chamfer at the bottom of the socket is not small (R0.3 or more) and thus improves impact resistance.

[0059] 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. 11(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), The drainage manifold is impact resistant so that it will not break if dropped.

[0060] A drainage collector pipe according to the present invention having 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 not damage the drainage collector pipe and the resin receiving port member included in the drainage collector pipe even if the drainage collector pipe and the cardboard box used as the packaging material are dropped during transportation from the drainage collector pipe manufacturing factory 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 according to the present invention is one that has impact resistance without having a chamfer of the above-mentioned size at the bottom of the receiving port (by having a chamfer larger than R0.3 at the bottom of the receiving port), and / or has impact resistance despite the adhesive part of the receiving port parts (side branch pipe receiving part 146 and upper pipe receiving part 144) (for example, the circumferential thickness of the (male side) adhesive part 146M in side branch pipe receiving part 146 is 3 mm or more and 10 mm or less. Note that the weld lines in the above-mentioned resin molded product can also be the starting point for cracks when the drainage collector pipe is dropped.

[0061] 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.

[0062] As described above, according to the drainage collecting pipe and the manufacturing method thereof according to the present embodiment, it is possible to provide a resin drainage collecting pipe to be installed in a through hole in the floor slab of a building, the drainage collecting pipe including an upper pipe protruding above the floor slab, a lower pipe bonded to the lower part of the upper pipe, and an outer layer member consisting of at least two layers provided on the outer periphery of the drainage collecting pipe from the lower part of the branch to the lower pipe, the outer layer member having a water-stopping property that satisfies specific conditions. It is also possible to provide a manufacturing method of the drainage collecting pipe including an inspection step that can quickly, easily, and reliably inspect the water-stopping property of the outer layer member.

[0063] 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]

[0064] The present invention is preferred for a resinous drainage collecting pipe installed in a through hole of a floor slab of a building, the drainage collecting pipe including an upper pipe protruding above the floor slab, a lower pipe bonded to the lower part of the upper pipe, and an outer layer member consisting of at least two layers provided on the outer periphery of the drainage collecting pipe from the lower part of the branch to the lower pipe, and is particularly preferred for a drainage collecting pipe provided with an outer layer member having a water-stopping property that satisfies specific conditions. Furthermore, the manufacturing method according to the present invention is particularly preferred in that the water-stopping property of the outer layer member consisting of at least two layers provided on the outer periphery of the drainage collecting pipe from the lower part of the branch to the lower pipe can be quickly, easily, and reliably confirmed (inspected). [Explanation of symbols]

[0065] 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 700 Outer layer material 710 Innermost layer 712 Thermally expandable fireproofing material 714 Damping material 720 (Intermediate layer) Vibration insulator 730 (Outermost) Soundproof Cover

Claims

1. A resin drainage collecting pipe to be installed in a through hole of a floor slab of a building, The drainage collecting pipe includes an upper pipe protruding above the floor slab, a lower pipe below the upper pipe, and an outer layer member consisting of at least two layers provided on the outer periphery of the drainage collecting pipe from below the branch to the lower 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 outer layer member includes an inner circumferential side member and an outer circumferential side member attached to the drain collecting pipe so as to cover the outer periphery of the inner circumferential side member, The inner circumferential side member is not present at least at the upper end and the lower end of the outer circumferential side member, and the outer circumferential side member is attached to the drain collecting pipe directly or by using another member with a water-stopping function so that the inner circumferential side member does not come into contact with water, A first state in which a first water pressure is applied to the upper end portion is continued until a first time period has elapsed; A second state in which a second water pressure lower than the first water pressure is applied to the lower end portion is continued until a second time has elapsed, or a third state in which water is sprayed on the lower end portion is continued until a third time has elapsed, A drainage collecting pipe, characterized in that the water-stopping performance is determined to be good by confirming that there is no water intrusion from the upper end and the lower end after completion of the first state and the second state, after completion of the first state and the third state, or after completion of the first state, the second state, and the third state.

2. The drainage collector pipe described in claim 1, characterized in that the first state is a state in which a water tank filled with water is prepared, the upper pipe of the drainage collector pipe is facing downward, and the state is upside down from after it is installed on the floor slab, and the drainage collector pipe, including the upper end portion, is immersed in the water stored in the water tank to a depth where the distance from the upper end to the water surface corresponds to the first water pressure.

3. 3. The drainage collecting pipe according to claim 2, wherein the first time period is 12 hours and the first water pressure is 200 mm head.

4. The drainage collector pipe described in claim 1, characterized in that the second state is a state in which a water tank filled with water is prepared, the upper pipe of the drainage collector pipe is placed upward, and the top and bottom are the same as after installation on the floor slab, and the drainage collector pipe, including the lower end portion, is immersed in the water stored in the water tank to a depth where the distance from the lower end to the water surface corresponds to the second water pressure.

5. 5. The drainage collecting pipe according to claim 4, wherein the second time is 12 hours and the second water pressure is 35 mm head.

6. The drainage manifold described in claim 1, characterized in that the third state is a state in which a sprinkler filled with water is prepared, and the upper pipe of the drainage manifold is downward, which is upside down from the state after installation on the floor slab, and water is sprayed on the lower end portion with the sprinkler.

7. The third time period is 100 seconds, and the amount of water sprayed per second is 100 cm 3 The drainage collecting pipe according to claim 6 ,

8. The absence of water intrusion is confirmed by checking the change in weight of the drainage collecting pipe before and after completion of the state, by cutting the cylindrical outer layer member along the axis of the drainage collecting pipe and opening it to check the inner peripheral side member, or by removing the cylindrical outer layer member along the axis of the drainage collecting pipe while keeping it cylindrical to check the inner peripheral side member. Joint pipe.

9. The drain collecting pipe according to claim 8, characterized in that a moisture detection material that is denatured by moisture or humidity is provided between the outer peripheral member and the inner peripheral member, and no water intrusion is confirmed by confirming that the moisture detection material is not denatured.

10. A method for manufacturing a resin drainage collecting pipe to be placed in a through hole of a floor slab of a building, the drainage collecting pipe having an outer layer member, the manufacturing method including an inspection step for ensuring a water-stopping property of the outer layer member, The drainage collecting pipe includes an upper pipe protruding above the floor slab, a lower pipe below the upper pipe, and an outer layer member consisting of at least two layers provided on the outer periphery from below the horizontal branch pipe connection part of the drainage collecting pipe to the lower 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 outer layer member includes an inner circumferential side member and an outer circumferential side member attached to the drain collecting pipe so as to cover the outer periphery of the inner circumferential side member, The manufacturing method includes: A resin preparation step of preparing a resin part included in the drainage collecting pipe by resin molding or carrying in and preparing the resin part; an assembling step of assembling the drainage collecting pipe using the resin parts; an outer layer member mounting step of mounting the outer periphery side member to the drain collecting pipe directly or using another member so that the inner periphery side member is not present at least at the upper end and the lower end of the outer periphery side member and so that the inner periphery side member has a water-stopping property of not contacting water; and an inspection step for ensuring the water-stopping property of the outer layer member provided in the drainage collecting pipe, The inspection step includes: a water immersion step of immersing the drainage collecting pipe, including the upper end portion, in water until a predetermined time has elapsed, to a predetermined depth from the upper end to the water surface; and a determination step of determining that the water-stopping ability is good by confirming that no water has entered from the upper end after completion of the water immersion step.

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