Drainage collecting pipe and method of manufacturing the same

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 resinous drainage collecting pipe installed in a through-hole in a floor slab of a building, the drainage collecting pipe including an upper pipe protruding above the floor slab, a lower pipe bonded below the upper pipe, and an outer layer member (sometimes referred to interchangeably as an outer layer cover) consisting of at least two layers attached to the outer periphery of the drainage collecting pipe from below the branch pipe to the lower pipe. In particular, the present invention relates to a drainage collecting pipe provided with an outer layer member that has watertight properties that satisfy specific conditions. In addition to such a drainage collecting pipe (itself), the present invention also includes a drainage collecting pipe (itself) whose outer layer member's watertightness has been quickly, easily, and reliably confirmed. Furthermore, in addition to such a drainage collecting pipe (itself), the present invention also includes a manufacturing method (of the drainage collecting pipe) that includes an inspection step to ensure the watertightness of the outer layer member. Here, the term "(itself)" is used to clearly distinguish between a drainage collecting pipe manufactured by a specific manufacturing method and a drainage collecting pipe whose outer layer components have been guaranteed to be watertight by a specific inspection step (the outer layer components satisfy the watertightness requirements), and refers to the drainage collecting pipe itself (not specified by these methods). [Background technology]

[0002] Water supply and drainage systems are installed in apartment buildings, office buildings, etc. The most widely known drainage system is a drainage piping structure that includes vertical pipes (standpipes, upper standpipes, lower standpipes, upper pipes, lower pipes) that run vertically through each floor of the building, horizontal pipes (horizontal branch pipes, branch pipes) installed within each floor, and drainage manifolds (also called drainage pipe joints, drainage pipe fittings, or drainage manifold joints) that connect these.

[0003] When installed in a building, this type of drainage collecting pipe comprises an upper pipe (main body, pipe body) that is placed in a through-hole in the floor slab and a lower pipe that is glued below the upper pipe, and the upper pipe has an upper pipe connection part at its top that can be connected to an 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 a 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 to a lower pipe (lower standpipe) that drains wastewater to the lower floor, or (if for the lowest floor) has a reduced diameter part and a lower pipe connection part that connects (directly or via a separate pipe) to a foot vent pipe that drains wastewater to the horizontal main pipe. Furthermore, drainage collecting pipes made of one or more injection-molded resins (typically rigid polyvinyl chloride (PVC)) are widely known.

[0004] An example of such a resin drainage manifold is the drainage pipe joint disclosed in Japanese Patent Laid-Open No. 2020-094481 (Patent Document 1). The drainage pipe joint disclosed in Patent Document 1 is formed from one or more resin injection-molded products, and when installed in a building, includes a pipe body that is placed in a through-hole in a floor slab, an upper riser pipe connection portion that protrudes above the floor slab and connects a drainage standpipe that introduces drainage water from an upper floor, a lower riser pipe connection portion that protrudes below the floor slab and connects a drainage standpipe that introduces drainage water to a lower floor, and a horizontal branch pipe connection portion that connects a horizontal drainage branch pipe above the floor slab, wherein a protrusion that protrudes from the inner surface of the pipe body is formed between the horizontal branch pipe connection portion and the lower riser pipe connection portion of the pipe body, a depression corresponding to the protrusion is formed on the outer surface of the pipe body, and the depression is filled with a heat-expandable fire-resistant material. Furthermore, the outer layer of the heat-expandable fire-resistant material is a three-layer structure (outer layer member) with 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: the innermost layer 710 of vibration-damping material, the middle layer of vibration insulator formed from fire-resistant inorganic fiber, and the 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 (adhesion) between the outer layer member and the resin drainage pipe joint needs to have watertightness. If this watertightness is low, the soundproofing material in the outer layer member may get wet when rainwater or the like 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, the watertightness needs to be inspected (including sampling inspection of the product or performance evaluation inspection of a prototype) before shipping. be.

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

[0007] The technique disclosed in Patent Document 2, in which a leak from a polyethylene flange joint heat-fused to a polyethylene tank is detected by applying soapy water to the heat-fused portion, sealing the heat-fused portion with a transparent cover, drawing a vacuum, and detecting a leak when the soapy water bubbles at the fused portion, can also be applied to a watertightness test of the outer layer member of a drainage collecting pipe, as shown in Figure 10. As shown in Figure 10(A), a transparent cover 1010 is sealed around the attachment portion (synonymous in this invention with a joint or adhesive portion) between the pipe body of the drainage collecting pipe 1000 (more specifically, the upper pipe 140 and the lower pipe 110 attached below the upper pipe that constitute the drainage collecting pipe 1000) and the outer layer member 700 shown in Figure 10(B) (denoted with the same reference numerals as in Figure 5(B)), and a vacuum is used to draw a vacuum on the transparent cover 1010 enclosing the drainage collecting pipe 1000. When the soapy water bubbles at the attachment portion, it can be detected that the watertightness is poor. The attachment portion between the pipe body and the outer layer member 700 in the drainage collecting pipe 1000 has an upper water stopping portion WP(U) and a lower water stopping portion WP(D). The detailed configuration of the outer layer member 700 will be described in the embodiment with reference to Figure 5. [Prior art documents] [Patent documents]

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

[0009] However, even if it were possible to test the watertightness of the outer layer member provided on the drainage pipe joint disclosed in Patent Document 1 using the leak testing method disclosed in Patent Document 2, the watertightness test would require a great deal of time and expense because it would be necessary to fabricate a transparent cover and to draw a vacuum. For this reason, there is a need for a drainage collecting pipe with an outer layer member and a method for testing the watertightness of the outer layer member in a drainage collecting pipe that can quickly, easily, and reliably confirm (test) the watertightness of the joint (bonded joint) between the drainage collecting pipe (main body) and the outer layer member in a drainage collecting pipe that has an outer layer member, but this has not yet been realized, which is a problem.

[0010] The present invention was developed in consideration of the above-mentioned problems, and its purpose is to provide a resinous drainage collecting pipe that is installed in a through-hole in the floor slab of a building, the drainage collecting pipe including an upper pipe that protrudes above the floor slab, a lower pipe that is bonded below the upper pipe, and an outer layer member consisting of at least two layers that is installed around the outer periphery of the drainage collecting pipe from below the branch to the lower pipe, the drainage collecting pipe (itself) having an outer layer member that has water-tight properties that satisfy specific conditions, and a method for manufacturing a drainage collecting pipe that allows the water-tightness of the outer layer member to be inspected quickly, easily, and reliably (including an inspection step to ensure the water-tightness 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 provides a drainage collecting pipe made of resin that is installed in a through hole in 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 below the 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 an 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 at least the upper end and lower end of the outer periphery side member, the outer periphery side member has a watertight property to prevent the inner periphery side member from coming into contact with water, and the outer periphery side member is provided in front The device is attached to the drainage collecting pipe directly or using other parts, and is characterized in that it is configured to maintain a first state in which a first water pressure is applied to the upper end portion until a first time period has elapsed, maintain a second state in which a second water pressure lower than the first water pressure is applied to the lower end portion until a second time period has elapsed, or maintain a third state in which water is sprayed onto the lower end portion until a third time period has elapsed, and after the completion of the first and second states, after the completion of the first and third states, or after the completion of the first, second and third states, it is confirmed that no water has entered from the upper end or the lower end, thereby determining that the watertightness is good.

[0013] The drainage collecting pipe according to this certain aspect is a resinous drainage collecting pipe installed in a through-hole in 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 attached to the outer periphery of the drainage collecting pipe from below a branch to the lower pipe, the upper pipe including an upper pipe connector connecting an upper pipe through which wastewater from the upper floor flows in, and at least one horizontal branch pipe connector 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 being absent at least at the upper and lower ends of the outer periphery member, the outer periphery member being attached to the drainage collecting pipe directly or using another member with a watertight 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 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 period has elapsed, or a third state in which water is sprayed on the lower end portion is continued until a third time period has elapsed, and after the completion of the first state and the second state, after the completion of the first state and the third state, or after the completion of the first state, the second state, and the third state, no water enters from the upper end or 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 manifold facing downwards, upside down from when it is installed on the floor slab, and immersing the drainage manifold, 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 is 12 hours and the first water pressure is 200 mm of water 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 manifold facing upward, in the same up and down state as after installation on the floor slab, and immersing the drainage manifold, 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 of water head.

[0018] More preferably, the third state can be configured such that 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 the sprinkler sprays water on the lower end portion.

[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 to be:

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

[0021] More preferably, a moisture detection material that is denatured by moisture or humidity is provided between the outer peripheral member and the inner peripheral member, and the absence of water intrusion can be confirmed by confirming that the moisture detection material has not been denatured.

[0022] In order to achieve the above object, a method for manufacturing a drainage collecting pipe according to another aspect of the present invention is a method for manufacturing a resin drainage collecting pipe to be placed in a through hole in 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 for connecting an upper pipe for introducing wastewater from an upper floor, and at least one horizontal branch pipe connection part for 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 inspecting a resin part included in the drainage collecting pipe by resin molding, a resin preparation step of preparing the drainage collecting pipe 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 layer member to the drainage collecting pipe directly or by using another member so that the inner layer member is not present at at least the upper and lower ends of the outer layer member and so that the inner layer member is not in contact with water, thereby providing a watertight property; and an inspection step of ensuring the watertight property of the outer layer member provided in the drainage collecting pipe, wherein 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, up to a predetermined depth from the upper end to the water surface; and a determination step of determining that the watertight property is good by confirming, after the water immersion step is completed, that no water has entered from the upper end. [Effects of the Invention]

[0023] According to the present invention, it is possible to provide a resinous drainage collecting pipe that is installed in a through-hole in the floor slab of a building, the drainage collecting pipe including an upper pipe that protrudes above the floor slab, a lower pipe that is glued below the upper pipe, and an outer layer member consisting of at least two layers that is provided around the outer periphery of the drainage collecting pipe from below the branch to the lower pipe, the drainage collecting pipe (itself) having an outer layer member that has water-tight properties that satisfy specific conditions, and a method for manufacturing a drainage collecting pipe that allows the water-tightness of the outer layer member to be inspected quickly, easily, and reliably (including an inspection step to ensure the water-tightness of the outer layer member). [Brief explanation of the drawings]

[0024] [Figure 1] 1A and 1B are diagrams showing a drainage piping structure in which a drainage collecting pipe 100 according to an embodiment of the present invention is adopted, in which (A) is an oblique view showing a state in which the drainage collecting pipe 100 is provided with an outer layer member 700, and (B) is an oblique view showing a state in which the drainage collecting pipe 100 is not provided with an outer layer member 700. [Figure 2] 1A and 1B are diagrams 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 a 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. [Figure 3] FIG. 3(A) is an exploded view of the drainage collecting pipe 100 shown in FIG. 2(B), and FIG. 3(B) is a perspective view of the lower pipe 110 seen through the pipe wall. [Figure 4] 1A and 1B are two-sided views of a drainage collecting pipe 100 according to an embodiment of the present invention. [Figure 5] (A) Cross-sectional view of 5A-5A in Figure 4(A), (B) Enlarged cross-sectional view of outer layer member 700 in Figure 5(A), (C) Enlarged cross-sectional view of outer layer member 700 in Figure 5(B) when outer layer member 700 is attached to upper tube 140 via rubber ring 900, (D) Partial cross-sectional view of 5A-5A when thermally expandable fire-resistant material 116 is not filled. [Figure 6] 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. FIG. [Figure 7]FIG. 2 is a diagram (part 2) 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 8] FIG. 3 is a diagram (part 3) 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 9] FIG. 4 is a diagram (part 4) 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 10] FIG. 1 is a diagram for explaining a conventional technique. [Figure 11] 1 is a diagram (part 1) for explaining features of the drainage collecting pipe (itself) according to an embodiment of the present invention. FIG. [Figure 12] FIG. 2 is a diagram (part 2) for explaining the characteristics of the drainage collecting pipe (itself) according to the embodiment of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[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, which includes an inspection step for ensuring the watertightness of the outer layer member provided on the drainage collecting pipe 100 (more specifically, in an outer layer member including an inner circumferential member and an outer circumferential member attached to the drainage collecting pipe 100 so as to cover the outer periphery of the inner circumferential member, the inner circumferential member is not present at least at the upper and lower ends of the outer circumferential member, and the inner circumferential member does not come into contact with water), with reference to Figures 1 to 9, 11 and 12.

[0026] Here, the drainage collecting pipe according to the present invention is a drainage collecting pipe having a technical feature that enables confirmation of no water intrusion from the upper water stopping portion WP(U) at the upper end side and the lower water stopping portion WP(D) at the lower end side of the outer layer member (sometimes referred to without distinguishing it from the outer layer cover) 700 by a water stop inspection method described below (and furthermore, confirmation of no water intrusion indicates that the water stop performance is good) (the technical feature possessed by the drainage collecting pipe itself is the water stop performance of this outer layer member, and the technical feature possessed by the drainage collecting pipe itself is the water stop performance of this outer layer member as a technical feature that cannot be achieved by the outer layer member alone or by 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 water stop performance of the outer layer member, which cannot be achieved by the outer layer member alone or by the drainage collecting pipe alone excluding the outer layer member, is provided as a technical feature of the drainage collecting pipe itself by satisfying the conditions described below.

[0027] In addition, such a drainage collecting pipe includes a resin preparation step in which the resin parts included in the drainage collecting pipe are prepared by resin molding or by transporting and preparing the resin parts; an assembly step in which the drainage collecting pipe is assembled using the resin parts; an outer layer member attachment step in which the outer layer member is attached to the drainage collecting pipe directly or using another member so that there is no inner layer member at least at the upper and lower ends of the outer layer member and so that the inner layer member is not in contact with water, thereby providing a watertight property; and an inspection step in which the watertight property of the outer layer member included in the drainage collecting pipe is ensured, and this inspection step includes a water immersion step in which the drainage collecting pipe, including the upper end portion, is immersed in water for a predetermined time period to a predetermined depth from the upper end to the water surface, and a judgment step in which, after the water immersion step is completed, it is determined that the watertight property is good by confirming that no water has entered from the upper end. Therefore, the manufacturing method of the drainage collection pipe according to 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 will be referred to as inspection step A) (regardless of whether the inspection step is carried out on all products, random inspection of products, or incorporation into performance inspection of prototypes).

[0028] Here, this inspection step A can be replaced with an inspection step B 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 determination step in which, after the water immersion step is completed, it is confirmed that no water has entered from the lower end and thereby it is determined that the watertightness is good. In addition, inspection step A can be replaced with inspection step C, which includes a water spraying step of spraying water on the lower end with a water sprayer filled with water, and a determination step of determining that the watertightness 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 inspection steps A, B, and C, any two of them, or all three of them.

[0029] The greatest feature of the method for manufacturing a drainage collecting pipe according to the present invention is that, in a drainage collecting 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 collecting pipe alone excluding the outer layer member, is provided as a technical feature of the drainage collecting pipe itself by confirming in an inspection step that the water-tightness of the outer layer member satisfies the [conditions for the water-tightness of the outer layer member satisfied by the drainage collecting 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, the inner layer side, the inner peripheral side, and the inside, and the thermally expandable fireproof material, the fireproof material, and the thermally expandable material may not be clearly distinguished from one another. To facilitate understanding of the present invention, the directions of the horizontal branch pipes may be identified using the hour hands of a clock, indicating 0, 3, 6, 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 drawings indicate the figure number with the number and the sub-number (A, B, C, etc.) of the letter in the drawing, and the drawing identified by the symbol shows a cross-sectional view (FIG. 4(A) and FIG. 5(A)). [Overall configuration of drainage manifold] A drainage collection pipe 100 according to an embodiment of the present invention will be described in detail below with reference to the drawings. As shown in FIGS. 1 to 5, a drainage piping structure using this drainage collection pipe 100 includes a non-fire-resistant resin drainage collection pipe 100 installed in a through-hole that vertically penetrates a floor slab in a building, and a resin drainage standpipe connected to the drainage collection pipe 100 (an upper floor drainage standpipe 220 (sometimes simply referred to as the upper pipe 220) 220 through which drainage water from the upper floor flows, and a lower floor drainage standpipe 230 (sometimes simply referred to as the lower pipe 230) through which drainage water flows down to the lower floor). Here, "non-fire-resistant" refers to a property that allows deformation, melting, or combustion due to heat generated in the event of a fire within the building, and includes, for example, resin. Optionally, it is also preferable that the multiple resin components that make up the drainage collection pipe 100 include portions made of a resin with excellent impact resistance. Here, a drainage collecting pipe including a portion employing a resin with excellent impact resistance refers to a drainage collecting pipe including a portion molded from resin by mixing 1 to 20 parts by weight of impact-improved resin (reinforcing agent) with 100 parts by weight of PVC resin. More specifically, (multiple) resin components (here, as an example, at least one of six components: upper pipe 140, lower pipe 110, upper pipe receptacle member 144, and three horizontal branch pipe receptacles 146) are molded from resin by mixing 1 to 20 parts by weight of impact-improved resin with 100 parts by weight of PVC resin. Optionally, it is also preferable to have the multiple resin components constituting drainage collecting pipe 100 include a portion employing a resin with excellent impact resistance. Here, a drainage collecting pipe including a portion employing a resin with excellent impact resistance refers to a drainage collecting pipe including a portion molded from resin by mixing 1 to 20 parts by weight of impact-improved resin (reinforcing agent) with 100 parts by weight of PVC resin. More specifically, (multiple) resin parts (here, as an example, at least one of six parts: upper pipe 140, lower pipe 110, upper pipe receiving member 144, and three horizontal branch pipe receiving members 146) 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 collecting pipe 100 and the drainage standpipe (upper floor drainage standpipe 220 (upper pipe 220) and lower floor drainage standpipe 230 (lower pipe 230)) are formed of, for example, polyvinyl chloride, polyethylene, polybutene, polypropylene, nylon, or the like. Note that the drainage standpipe may be, for example, a so-called fire-resistant two-layer pipe. As shown in FIG. 3(A), the drainage collecting pipe 100 is formed of one or more injection-molded resin parts (here, as an example, six parts: upper pipe 140, lower pipe 110, upper pipe receptacle member 144, and horizontal branch pipe receptacle members 146 x 3). The drainage collecting pipe 100 is a resin drainage collecting pipe that is placed in a through-hole in the floor slab of a building, as shown in FIGS. 1 to 3, and the drainage collecting pipe 100 is formed above the floor slab. The lower pipe 110 includes an upper pipe 140 protruding toward the floor below, and a lower pipe 110 adhered below the upper pipe 140. The upper pipe 140 includes an upper pipe connection portion 143 to which an upper pipe receptacle member 144 is adhered for connecting an upper pipe 220 that carries wastewater in from the upper floor, and at least one (here, three) horizontal branch pipe connection portion 142 to which a horizontal branch pipe receptacle member 146 is adhered for connecting a horizontal branch pipe above the floor slab. The lower pipe 110 includes a lower pipe connection portion 130 to which a lower pipe 230 that carries wastewater out to the floor below is adhered. Resin receptacle members (more specifically, an upper pipe receptacle member 144 and a horizontal branch pipe receptacle member 146) are adhered to the upper pipe connection portion 143 and the horizontal branch pipe connection portion 142, respectively.

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

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

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

[0035] Furthermore, it is preferable that the outer layer of the thermally expandable fire-resistant 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 to cover the lower part of the upper pipe 140. 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, one example of the outer layer member 700 has a three-layer structure, and is provided, from the outer surface of the drainage collecting pipe 100, with a vibration-damping material 714, a vibration insulator 720 made of fire-resistant inorganic fiber, and a sound-insulating cover 730, in that order, 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. 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 made of fire-resistant inorganic fiber in the middle layer is formed from an aggregate of fire-resistant inorganic fiber (glass wool, rock wool, ceramic fiber, etc.). Note that in the innermost layer 710, a thermally expandable fire-resistant material 712 is provided instead of the vibration-damping material 714. In other words, the three-layer 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, apart from 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-layer structure or is made of 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 (not referenced) equipped with an upper pipe connection section 143 that connects the upper pipe 220 via an upper pipe receiving member 144 and lateral branch pipe connection sections 142 that connect lateral branch pipes at three locations at 90° intervals in top view via lateral branch pipe receiving members 146, the upper pipe receiving member 144, and three lateral branch pipe receiving members 146. Here, the number of lateral branch pipe connection sections is not limited, and the lateral branch pipe receiving members 146 may be either one that connects a lateral branch pipe without reducing its diameter (the lateral branch pipe receiving member shown), or one that connects a lateral branch pipe with a reduced diameter, although this is not limited.

[0037] Furthermore, this drainage collecting pipe 100 is formed from the six resin injection-molded products shown in Figure 3(A) as described above in the manufacturing plant for this drainage collecting pipe 100, and the joints between these separate injection-molded products shown in Figure 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 Figure 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 or 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 that consists of at least two layers (three layers in this case) and is provided around the outer periphery from below the branch of the drainage collecting pipe 100 (this below the branch refers to the vicinity of directly 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 that carries wastewater 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, with a resin upper pipe receptacle member 144 adhered to the upper pipe connection part 143 and a resin horizontal branch pipe receptacle member 146 adhered to the horizontal branch pipe connection part 142. Also, as shown in Figure 5(A) (only), the drainage collecting pipe 100 may be equipped with a rubber ring 144G on the upper pipe receptacle member 144 and a rubber ring 146G on the horizontal branch pipe receptacle member 146 (as optional components).

[0039] The outer layer member 700 provided in the drainage collecting pipe 100 includes an inner circumferential 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 circumferential member (here, the sound-insulating cover 730 of the outermost layer) attached to the drainage collecting pipe 100 so as to cover the outer periphery of the inner circumferential member, and the inner circumferential 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 circumferential member (sound-insulating cover 730), and the outer circumferential member (sound-insulating cover 730) has water-stopping properties to prevent the inner circumferential 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 another member, a rubber ring 900, 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 the property that its function decreases when it comes into contact with water. For this reason, to ensure watertightness, more specifically, but not limited to, the outer peripheral member (sound-insulating cover 730) is attached to the upper pipe 140 and the lower pipe 110 of the drainage collecting pipe 100 (and further via rubber rings 900) with an adhesive to provide watertightness.

[0040] The present invention relates to a 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 below the branch to the lower pipe, and this 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 shown in the figure, and there is no 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 attached to the drainage collecting pipe directly or using another member with a water-stopping function so that the inner peripheral side member does not come into contact with water, and it can be confirmed that the water-stopping function of the outer layer member is good, and as described below, it includes a resin preparation step in which resin parts included in this drainage collecting pipe are prepared by resin molding or by transporting and preparing resin parts, an assembly step in which the drainage collecting pipe is assembled using the resin parts, and there is no inner peripheral side member at least at the upper and lower ends of the outer peripheral side member. The present invention relates to a method for manufacturing a drainage collecting pipe, which includes an outer layer member attachment step of attaching an outer layer member to the drainage collecting pipe directly or using another member so that the outer layer member is not present in the drainage collecting pipe and has water-tight properties that prevent the inner peripheral member from coming into contact with water, and an inspection step of ensuring the water-tight properties of the outer layer member provided in the drainage collecting pipe, and this inspection step includes at least a water-immersion step of immersing the drainage collecting pipe, including its upper end, in water to a predetermined depth from the upper end to the water surface for a predetermined time, and a determination step of determining that the water-tight properties are 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 by satisfying the following conditions in addition to the above-mentioned configuration. The conditions satisfied by the drainage collecting pipe (itself) according to the present invention are: (1) As shown in FIG. 6, a first state in which a first water pressure is applied to the upper end portion (portion of the upper water stopping 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 is maintained 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 member (sound insulating cover 730) of the outer layer member 700 until a second time period has elapsed, as shown in FIG. 7, or a third state is maintained in which water is sprayed onto the lower end portion (the lower water stop portion WP(D)) of the outer peripheral member (sound insulating cover 730) of the outer layer member 700 until a third time period has elapsed, as shown in FIG. (4) (4-1) After the completion of the first state and the second state, (4-2) After the completion of the first state and the third state, or (4-3) After the completion of the first state, the second state, and the third state, there is no (not recognized) intrusion of water from the upper end portion (the upper water-stopping portion WP(U) portion) and 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. These are the conditions, and the drainage collecting pipe according to the present invention is characterized as a drainage collecting pipe that satisfies these conditions. Furthermore, the drainage collecting pipe according to the present invention is characterized as a drainage collecting pipe that has been determined to have good watertightness by confirming that no water has entered into it. The subject of the present invention is a drainage collecting pipe (itself) that satisfies these conditions, and the method for testing whether or not this condition is satisfied is an inspection method, and this inspection method corresponds to the inspection step in the drainage collecting pipe manufacturing method described below.

[0041] The above-mentioned conditions will now be described in more detail. First, the water pressure at the first time and the first state will be described in detail. In this first state, as shown in FIG. 6, a water tank 800 containing water W is prepared, and the upper pipe 140 of the drainage collecting pipe 100 is placed downward, upside down from the state after installation on the floor slab. The drainage collecting pipe, including the upper end portion (upper water stop portion WP(U)) of the outer peripheral member (sound-insulating cover 730) of the outer layer member 700, is immersed in water W stored in the water tank 800 until the first time has elapsed, to a depth corresponding to the first water pressure from the upper end portion (upper water stop portion WP(U)) of the outer peripheral member 700 to the water surface. Here, the first time, which satisfies the conditions of the drainage collecting pipe according to the present invention, is 12 hours, and the first water pressure is 200 mm of water head. The reason for the first water pressure being 200 mm of water 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 on such a stepped floor slab, the upper end portion (upper water stopping portion WP(U)) of the outer peripheral member (sound insulating cover 730) of the outer layer member 700 will be submerged in water up to a depth of about 200 mm (which is almost the maximum step in the stepped slab). Assuming this condition, the first water pressure is set to 200 mm head.

[0042] Next, the water pressure during the second time period and the second state will be described in detail. In this second state, as shown in Fig. 7, a water tank 800 containing water W is prepared, and the upper pipe 140 of the drainage collecting pipe 100 is placed upward, in the same up-down position as after installation on the floor slab. The drainage collecting pipe, including the lower end portion (the lower water stop portion WP(D)) of the outer peripheral member (sound-insulating cover 730) of the outer layer member 700, is immersed in water W stored in the water tank 800 until the second time period has elapsed, to a depth corresponding to the second water pressure, from the lower end portion (the lower water stop portion WP(D)) of the outer peripheral member (sound-insulating cover 730) to the water surface. Here, the second time period, which satisfies the conditions of the drainage collecting pipe according to the present invention, is 12 hours, and the second water pressure is 35 mm of water head (lower than the first water pressure). Here, 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 layer member 700's outer peripheral member (sound-insulating cover 730) may be exposed to rainwater and other intrusions and come into contact with the rainwater, but will not be submerged in water 200 mm deep like the upper end portion (the upper water-stopping portion WP(U) portion) of the outer layer member 700's outer peripheral member (sound-insulating cover 730) even when installed on a stepped floor slab.

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

[0044] In addition, 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 be present, because even if 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 portion of the lower water-stopping portion WP(D)) 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 (not recognized) intrusion of water from the upper end portion (upper water stop portion WP(U)) of the outer peripheral member (sound insulating cover 730) of the outer layer member 700 and the lower end portion (lower water stop portion WP(D)) of the outer peripheral member (sound insulating 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 (not recognized) intrusion of water from the upper water stop portion WP(U) and the lower water stop portion WP(D), will be described in detail below. The absence of water intrusion under the conditions satisfied by the drainage collecting pipe of the present invention can be confirmed by (A) checking the change in weight of the drainage collecting 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 a water spray amount per unit time, and before and after a combination of these states is performed), (B) cutting the cylindrical outer layer member 700 along the axial center (direction) of the drainage collecting pipe 100 and cutting it open to check the inner peripheral components (thermally expandable fire-resistant material 712 or vibration-damping material 714 and 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 collecting pipe 100 to check the inner peripheral components (thermally expandable fire-resistant material 712 or vibration-damping material 714 and 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 insulating cover 730) and the inner peripheral member (thermally expandable fireproof material 712 or vibration damping material 714 and vibration insulator 720), and the absence of water intrusion can be confirmed by water It is important to ensure that the moisture detection material is not denatured. Materials that are denatured by moisture or humidity and that are suitable for use in the moisture detection material include microcapsules, silica gel, cobalt chloride hexahydrate, and other materials that change color due to moisture or humidity, as well as absorbent sheets, water-soluble sheets, and other materials that change in quality (shape) due to moisture or humidity. Thus, the term "denaturation (change in properties)" in this invention includes, by way of example, discoloration (color change) and shape change. [Inspection method for drainage manifold (watertightness)] The following provides a detailed explanation of the method for testing the watertightness (of the outer layer member 700 in the drainage collecting pipe 100) according to the present invention (hereinafter sometimes simply referred to as the watertightness testing method). This watertightness testing method tests the watertightness of the outer layer member 700 included in the drainage collecting pipe 100, which has the above-described configuration (the drainage collecting pipe formed from 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 drainage collecting pipe 100, including its upper end portion, is immersed in the water stored in the water tank 800 for 12 hours, with the upper pipe 140 of the drainage collecting pipe 100 facing downwards, upside down from when it was installed on the floor slab, to a depth of 200 mm from 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 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 drainage collecting pipe 100, including its lower end portion, is immersed in the water stored in the water tank 800 until 12 hours have passed, with the upper pipe 140 of the drainage collecting pipe 100 facing upward, in the same upside-down position as after installation on the floor slab, 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 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 from when the drainage collecting pipe 100 was installed on the floor slab. 3 The lower end portion (lower stopper) of the water sprinkler 810 is kept in the water for 100 seconds. Water the water part WP(D)).

[0049] <Decision step: Decision step for inspection steps A, B, and C> After the first inspection step and the second inspection step are completed, or after the first inspection step and the third inspection step are completed, or after the first inspection step, the second inspection step, and the third inspection step 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 fire-resistant 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 fire-resistant material 712 or vibration-damping material 714 and vibration insulator 720) can be confirmed. The watertightness can be determined to be good by removing the drain collecting pipe 100 along the line to make it possible to check the inner peripheral member (thermal-expandable fire-resistant material 712 or vibration-damping material 714 and vibration insulator 720) and confirming that the moisture detection material, which is degraded by moisture or humidity and is provided between the outer peripheral member (sound-insulating cover 730) and the inner peripheral member (thermal-expandable fire-resistant material 712 or vibration-damping material 714 and vibration insulator 720), has not degraded, or by confirming the change in weight of the drain collecting pipe 100 before and after the completion of the state. [Manufacturing method of drainage manifold] Hereinafter, a method for manufacturing a drainage collecting pipe 100 according to an embodiment of the present invention will be described with reference to the above-mentioned [(watertightness) inspection method for drainage collecting pipe]. This manufacturing method is a method for manufacturing a resin drainage collecting pipe 100 that is placed in a through-hole in the floor slab of a building. This drainage collecting 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 collecting pipe 100 has an upper pipe that protrudes above the floor slab, a lower pipe below the upper pipe, and a pipe that is attached to the outer periphery of the drainage collecting 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 that allows wastewater to flow 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] As described above, the manufacturing method of the drainage collecting pipe 100 includes an inspection step for ensuring the watertightness of the outer layer member. In addition to the inspection step, the manufacturing method of the drainage collecting pipe 100 also includes a resin preparation step for preparing resin components to be included in the drainage collecting pipe by resin molding or by transporting and preparing the resin components; an assembly step for assembling the drainage collecting pipe using the resin components; an outer layer member attachment step for attaching the outer layer member to the drainage collecting pipe directly or using other members so that the inner layer member is not present at at least the upper and lower ends of the outer layer member and so that the inner layer member does not come into contact with water, thereby achieving watertightness; 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, in water for a predetermined time period, up to a predetermined depth from the upper end to the water surface, and a determination step for determining 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 and the steps other than the resin preparation step are different, 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 and preparing them, and if the person and / or place performing the resin preparation step and the steps other than the resin preparation step are the same, the resin preparation step is a step of preparing the multiple resin parts included in the drainage collecting pipe 100 by resin molding. The assembly step is to bond the joints between the six resin injection molded parts shown in Figure 3(A) with an adhesive. In Figure 3(A), the letter M immediately following the number in the symbol indicates the male side. (In the socket portion where the upper tube 140 and the lower tube 110 are bonded, the male side 140MD corresponds to the male side of the socket member.) The letter F indicates the female side. (In the above-mentioned socket portion, the female side 110F corresponds to the female side of the socket member) The fitting parts are then bonded together with an adhesive. Here, as shown in Figure 3(A), in the upper pipe 140 of the drainage collecting pipe 100 of this embodiment, an upper pipe connection member 144 is connected to the upper pipe connection portion 143, a horizontal branch pipe receiving member 146 is connected to the horizontal branch pipe connection portion 142, and a lower pipe 110 is connected to the lower end of the upper pipe 140. In this case, as shown in Figure 3, the upper pipe connection portion 143 is the male side 140MU, the upper pipe connection member 144 is the female side 144F, and the male side 140MU is fitted onto the female side 144F (the male side 140MU is inserted into the female side 144F), the horizontal branch pipe connection portion 142 is the female side 142F, and the horizontal branch pipe connection member 146 is the male side 146M, and the male side 146M is fitted onto the female side 142F (the male side 146M is inserted into the female side 142F), and the lower end of the upper pipe 140 is the male side 140MD, and the upper end of the lower pipe 110 is the female side 110F, and the male side 140MD is fitted onto the female side 110F (the male side 140MD is inserted into the female side 110F), and they are connected. As shown in these figures, there are cases where a male side (specifically, male side 140MU, male side 140MD) is formed, and cases where a female side (specifically, female side 142F) is formed on upper pipe 140. In the drainage collecting pipe according to the present invention, the male and female sides may be reversed from that shown in Figure 3. [Characteristics of the drainage manifold (itself)] The features of the drainage collecting pipe (itself) according to the present invention will be explained below. The following explanation will clarify the features of the drainage collecting pipe (itself) according to the present invention, as well as the performance of the drainage collecting pipe (itself) (adhesion performance of the adhesive joint, watertight performance of the outer layer member, impact resistance performance, etc.).

[0051] Characteristics of the drainage manifold (itself) regarding the adhesive performance (adhesion) of the adhesive joint In the drainage collecting pipe 100 according to the present invention, an upper pipe 140 and a lower pipe 110 are bonded together with an adhesive at their respective joints. A resin upper pipe receiving member 144 is attached to the upper pipe connecting portion 143 of the upper pipe 140, and a resin side branch pipe receiving member 146 is attached to the side branch pipe connecting portion 142. Because the drainage collecting pipe 100 and the receiving member are molded resin products, a parting line or weld line exists at the bonded joint, creating a slight step. The presence of these steps in the drainage collecting pipe 100 (here, the upper pipe 140 and the lower pipe 110) and the receiving members (the upper pipe receiving member 144 and the side branch pipe receiving member 146) can impair adhesion at the bonded joint. This slight step is between 0.01 mm and 0.8 mm, and includes slight steps due to burrs or gouges in addition to the parting line or weld line. Although the drainage collecting pipe 100 (here, upper pipe 140 and lower pipe 110) and the receiving members (upper pipe receiving member 144 and horizontal branch pipe receiving member 146) have these steps that inhibit adhesion at the bonded joints, the drainage collecting pipe 100 (itself) has good adhesion at the bonded joints between the upper pipe 140 and lower pipe 110 and between the upper pipe 140 and the receiving members. The drainage collecting pipe (itself) whose adhesion has been confirmed is the drainage collecting 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 drainage collecting pipe (itself) is confirmed to have good adhesion at the bonded portions including this portion (the bonded portion between the upper pipe 140 and the lower pipe 110, and the bonded portion between the upper pipe 140 and the receiving portion (the upper pipe receiving portion 144 and the horizontal branch pipe receiving portion 146)). 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 lead to adhesion failure 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 members (upper pipe receiving member 144 and side branch pipe receiving member 146)), but this possibility is avoided or suppressed in the drainage collecting pipe of the present invention. Also, the center of the (circular) adhesive joint in the receiving members (upper pipe receiving member 144 and side branch pipe receiving member 146) is misaligned from the center of the (circular) receiving port in the drainage collecting pipe, so that when the receiving port part is pressed into the receiving port during bonding, the misalignment with the adhesive joint can cause the part to tilt, resulting in adhesion failure, but this possibility is avoided or suppressed in the drainage collecting pipe of the present invention.

[0053] Furthermore, the drainage collecting pipe 100 according to the present invention has a bonded portion between the upper pipe 140 and the lower pipe 110, a bonded portion between the side branch pipe connecting portion 142 of the upper pipe 140 and the side branch pipe receiving member 146, and a bonded portion between the upper pipe connecting portion 143 of the upper pipe 140 and the upper pipe receiving member 144. These bonded portions have adhesive performance such that the adhesive strength of the bonded portion 24 hours after bonding is 0.5 MPa or more. This adhesive strength is calculated by dividing the maximum load in a tensile test (10 mm / min) by the area of ​​the bonded portion. A drainage collecting pipe (itself) in which the adhesive strength of these bonded 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) regarding the watertightness of the outer layer material When the drain 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 below) are tightly attached to the outer peripheral surface of the drain collecting pipe 100 (of the upper pipe 140 and / or lower pipe 110), parting lines or weld lines occur at positions on the outer surface of the drain collecting pipe 100 corresponding to the upper and lower ends of the outer layer member 700 due to the drain collecting pipe 100 being a resin molded product, resulting in slight steps. The presence of these steps in the drain collecting pipe (itself) 100 can impair the watertightness at the attachment point of the outer layer member 700. As described above, this slight step is between 0.01 mm and 0.8 mm, and includes cases where slight steps occur due to burrs or gouges in addition to parting lines or weld lines. In this way, the drainage collecting pipe 100 (itself) has these steps, which can hinder the 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, even when 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 made 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, and this sound-insulating cover is formed of an elastomer or resin-based material (such as EPDM (ethylene propylene diene rubber)) (it can be made of not only soft materials such as rubber but also hard PVC). Because 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, because 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 (the upper pipe 140 and / or the lower pipe 110) (if it were smaller, it would require extensive expansion to be able to attach it). This lack of interference fit is disadvantageous for watertightness (it hinders watertightness), but it is still possible to attach the sound-insulating cover to the drainage collecting pipe 100. The drain collecting pipe 100 (itself) has a watertight property to prevent water from entering between it and the outer layer member 700. The drain collecting pipe (itself) that has been confirmed to have this watertight property is the drain collecting pipe of the present invention. In particular, there are cases where the outer layer member is attached to a resin (injection) molded part while it still has oil adhering to it from the molding process, and if the parts are bonded together while the oil remains (in this case, if the outer layer member is bonded to the drain collecting pipe), there is a possibility of poor adhesion, but such a possibility is avoided or suppressed in the drain collecting 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 members, 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 impact resistant when a lateral branch pipe receiving member 146, which is a separate member from the upper pipe 140, is attached (by glue) to the lateral branch pipe connecting portion 142 of the upper pipe 140, and an upper pipe receiving member 144, which is a separate member from the upper pipe 140, is attached (by glue) to the upper pipe connecting portion 143 of the upper pipe 140.

[0057] These upper tubes 140, Fitted and glued onto the upper tube 140 The drainage collecting pipe according to the present invention, which is composed of 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 has some parts where the chamfering at the corners is small (more specifically, R0.1 or more and R0.3 or less). When the drainage collecting pipe is dropped, stress concentrates at these small chamfered parts, which become the starting point for cracks (breakage). For example, as shown in Figure 12, an example of such a part is the receiving member of the lower pipe 110, into which the lower end of the upper pipe 140 is inserted. (Female side 110F) The lower pipe 110 has a chamfered portion 110ER at its bottom 110E. (Female side 110F) Insert the plug (bottom end of upper tube 140) Male side 140MD ) is inserted, the socket of the lower pipe 110 (Female side 110F) At this time, a force is applied that expands outward. Lower pipe 110 socket (Female side 110F) If the chamfering of the chamfered portion 110ER is small (R0.1 or more and R0.3 or less), stress tends to concentrate, and when the drainage collecting pipe falls, the stress is concentrated in that portion (here, the adhesive portion between the upper pipe 140 and the lower pipe 110ER). (receptacle part) is Two In the case of a stage drainage collecting pipe, the joint between the upper lower pipe 110 and the lower upper pipe 140 (receptacle part) ) stress is concentrated at the chamfered part 110ER, which becomes the starting point of the crack. (Tree Receptacle for oil-molded products (Female side 110F) ) may be damaged.

[0058] The socket of the lower pipe 110 into which the lower end of the upper pipe 140 shown in FIG. (Female side 110F) Not only The female side of the joint (the part where the socket members are joined) of the socket members (the horizontal branch pipe socket member 146 and the upper pipe socket member 144) is The socket side is inserted and attached (the socket side (female side) Resin molded products The person being inserted socket Side (female side) If the chamfering of the bottom of the drainage manifold is small (between R0.1 and R0.3), stress tends to concentrate as mentioned above, and when the drainage manifold is dropped, stress concentrates in that area, causing cracks (the receiving end of the resin molded product on the receiving end side). (female side)The drainage collecting pipe (itself) of the present invention is (female side) The chamfer at the bottom is not small (greater than R0.3), improving impact resistance.

[0059] In addition, the drainage collecting pipe according to the present invention , the wall thickness t of the female side (shown in FIGS. 12(B) and (C)) of the receiving opening of the lower pipe 110 into which the lower end of the upper pipe 140 is inserted, and Adhesion portion of the receiving member (lateral branch pipe receiving member 146 and upper pipe receiving member 144) (the part where the receiving part is glued) Circumferential thickness (wall thickness) teeth 、 The thickness of the receiving part in the circumferential direction is 3 mm or more and 10 mm or less (to increase impact resistance) (wall thickness) The drainage collecting pipe (itself) according to the present invention may be damaged by the stress concentration when it is dropped, because the drainage collecting pipe is not designed to be excessively thick. (female side) Circumferential thickness of (wall thickness) Although it is not excessively thick (not exceeding 10 mm), The chamfer at the bottom of the socket (female side) is not small (larger than R0.3). It is characterized by improved impact resistance. More specifically, as shown in Figures 3 and 12 and described above, the structural features of the drainage collecting pipe (itself) according to the present invention include not only (a) the female side 110F at the connection between the male side 140MD of the upper pipe 140 and the female side 110F of the lower pipe 110, but also (b) the female side 144F at the connection between the male side 140MU of the upper pipe connecting portion 143 of the upper pipe 110 and the female side 144F of the upper pipe receiving member 144, and ) At the connection between the female side 142F of the horizontal branch pipe connection portion 142 of the upper pipe 110 and the male side 146M of the horizontal branch pipe receiving member 146, any one of the three connection portions (a), (b), and (c) of the female side 142F has: (α) a chamfered portion larger than R0.3 at the bottom of the female receiving port; (β) in addition to having a chamfered portion larger than R0.3 at the bottom of the female receiving port, the thickness of the adhesive portion on the female side does not exceed 10 mm. Furthermore, if the chamfer (R) on 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 of the present invention is small, as described above, the drainage collecting pipe may break if dropped, so it is preferable that the chamfer R be larger than R3 for the receiving member of a normal drainage collecting pipe. The drainage collecting pipe (itself) of the present invention is characterized by improved impact resistance despite the chamfer (R) on the outer periphery of the tip of the receiving member not being excessively large (R0.1≦R≦R3). For example, the chamfer (R) on 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 of the present invention is R1, which is considerably smaller than the chamfer (R) on 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 is referred to as R3 here), yet still provides impact resistance that prevents the drainage collecting pipe from breaking if dropped.

[0060] These characteristics (underbite (female side) The bottom chamfer of the socket does not have a small chamfer and / or (female side) Circumferential thickness of the member (wall thickness) The drainage collecting pipe according to the present invention, which has a thickness that is not excessively thick, is guaranteed to prevent damage to the drainage collecting pipe and the resin receiving member included in the drainage collecting pipe even if the cardboard box used as the packaging material is dropped during transportation from the drainage collecting pipe manufacturing factory to the construction site. The drainage collecting pipe according to the present invention is a drainage collecting pipe with such impact resistance. (female side) The bottom of the socket does not have a chamfer of the above size. (female side) (with a chamfer at the bottom of the case greater than R0.3) and / or The female wall thickness t (shown in Figures 12(B) and (C)) of the socket of the lower pipe 110 into which the lower end of the upper pipe 140 is inserted, and Adhesion portion of the receiving member (lateral branch pipe receiving member 146 and upper pipe receiving member 144) (the part where the receiving part is glued) Circumferential thickness (wall thickness) teeth 、 The drainage collecting pipe of the present invention is a drainage collecting pipe that has impact resistance despite being 3 mm or more and 10 mm or less. Note that the weld lines in the resin molded product described above can also be the starting points for cracks when the drainage collecting 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 PVC parts, which are resin molded products, is 40 MPa or more and 60 MPa or less based on JIS K6739.

[0062] As described above, the drainage collecting pipe and manufacturing method thereof according to this embodiment can 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 below the upper pipe, and an outer layer member consisting of at least two layers arranged around the outer periphery of the drainage collecting pipe from below the branch to the lower pipe, the outer layer member having watertight properties that satisfy specific conditions. It can also provide a manufacturing method for a drainage collecting pipe that includes an inspection step that can quickly, easily, and reliably inspect the watertightness of the outer layer member.

[0063] It should be noted that the embodiments disclosed herein should be considered to be illustrative in all respects and not restrictive. The scope of the present invention is defined by the claims, not by 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 in a floor slab of a building, the drainage collecting pipe including an upper pipe protruding above the floor slab, a lower pipe bonded below the upper pipe, and an outer layer member consisting of at least two layers arranged around the outer periphery of the drainage collecting pipe from below the branch pipe to the lower pipe, and is particularly preferred for a drainage collecting pipe in which the outer layer member is provided with water-stopping properties that satisfy specific conditions. Furthermore, the manufacturing method of the present invention is particularly preferred in that it allows the water-stopping properties of the outer layer member consisting of at least two layers arranged around the outer periphery of the drainage collecting pipe from below the branch pipe to the lower pipe to be quickly, easily, and reliably confirmed (inspected). [Explanation of symbols]

[0065] 100 Drainage collection pipe 110 Lower pipe 114 Swirling blades 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 member 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 layer) Sound insulation cover

Claims

1. A resin drainage collecting pipe installed in a through hole in 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 horizontal branch pipe connection part to the lower pipe, The drainage collecting pipe is made of resin, and therefore a step of 0.01 mm or more and 0.8 mm or less is provided on the outer surface of the drainage collecting pipe due to a parting line or a weld line at the attachment point of the outer layer member, The inner diameter of the outer layer member is not an interference fit smaller than the outer diameter of the drainage collecting pipe, The presence of the step and the lack of an interference fit are factors that hinder the water-stopping ability of the outer layer member, The upper pipe includes an upper pipe connection portion that connects an upper pipe that allows drainage water to flow in from an upper floor, and at least one horizontal branch pipe connection portion that connects a horizontal branch pipe above the floor slab, the outer layer member includes an inner circumferential member and an outer circumferential member attached to the drain collecting pipe so as to cover the outer periphery of the inner circumferential member, a moisture detection material that is denatured by moisture or humidity is provided between the outer peripheral member and the inner peripheral member; The outer peripheral member is opaque, A drainage collecting pipe that has a water-tight property that satisfies the following <conditions> as an object to prevent the inner peripheral member from coming into contact with water, but that has factors that inhibit the water-tight property as an object characteristic, and the outer peripheral member is attached to the drainage collecting pipe directly or using another member. <Conditions> A first state in which a first water pressure of 200 mm water head is applied to the upper end portion of the outer peripheral side member is continued until a first time of 12 hours has elapsed, The second state in which a second water pressure of 35 mm, which is lower than the first water pressure, is applied to the lower end portion of the outer peripheral member is continued until a second time of 12 hours has elapsed, or the water spray rate per second is 100 cm3 until a third time of 100 seconds has elapsed. ３ The third state of spraying water on the lower end portion is continued, After the first state and the second state are completed, the first state and the third state are After completion of the first state, the second state, and the third state, or after completion of the first state, the second state, and the third state, there is no intrusion of water from the upper end and the lower end.

2. The drainage collecting pipe according to 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 collecting pipe is downward, and the state is upside down from after installation on the floor slab, and the drainage collecting 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 of water head.

4. The drainage manifold 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 manifold is facing upward, and the drainage manifold, 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, in the same upside-down state as after installation on the floor slab.

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

6. The drainage manifold according to 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, characterized in that

8. The drainage collecting pipe described in claim 1, characterized in that the absence of water intrusion can be confirmed by checking the change in weight of the drainage collecting pipe before and after the completion of the state, by cutting and slicing open the tubular outer layer member along the axis of the drainage collecting pipe to check the inner circumferential member, or by removing the tubular outer layer member while still in its cylindrical form along the axis of the drainage collecting pipe to check the inner circumferential member.

9. The drainage manifold of 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 has not been denatured.

10. A method for manufacturing a resin drainage collecting pipe to be placed in a through-hole in a floor slab of a building, the drainage collecting pipe having an outer layer member, the manufacturing method including 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 the horizontal branch pipe connection part to the lower pipe, The upper pipe includes an upper pipe connection portion that connects an upper pipe that allows drainage water to flow in from an upper floor, and at least one horizontal branch pipe connection portion that connects a horizontal branch pipe above the floor slab, the outer layer member includes an inner circumferential member and an outer circumferential member attached to the drain collecting pipe so as to cover the outer periphery of the inner circumferential member, The manufacturing method includes: a resin preparation step of preparing resin parts included in the drainage collecting pipe by resin molding or by transporting and preparing the resin parts; an assembling step of assembling the drainage collecting pipe using the resin parts; an outer layer member attaching step of attaching the outer layer member to the drainage collecting pipe directly or using another member so as to provide a watertight seal that prevents the inner layer member from coming into contact with water; and an inspection step for ensuring the watertightness 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 of the outer peripheral member, in water until a distance from the upper end of the outer peripheral member to the water surface reaches a predetermined depth for a predetermined time; and a determining 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, The method for manufacturing a drainage collecting pipe, wherein the predetermined depth corresponds to a water head of 200 mm, and the predetermined time is 12 hours.

Images