Manifold joint, method for manufacturing manifold joint, and piping structure

Abstract

To provide a collective joint with no leak of drainage from a connection part at a low cost.SOLUTION: A collective joint 200 includes a collective part 210 that has a vertical pipe connection part 212 installed above, a horizontal pipe connection part 213 provided on the side, and a straight pipe connection part 211B provided below; and a straight pipe portion 220 connected to the straight pipe connection part 211B. The upper end of the straight pipe portion 220 has a receiving portion 220A with an enlarged diameter, and the straight pipe connection part 211B is arranged inside the receiving portion 220A.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present invention relates to a joint and a piping structure. [Background technology]

[0002] Multi-story buildings such as apartment buildings have horizontal branch pipes that introduce wastewater from sanitary equipment in the rooms on each floor. The wastewater transported by the horizontal branch pipes is collected by a collecting joint. The collected wastewater is then discharged into the sewer through a leg joint connected to the bottom of the collecting joint. Regarding the connection between the collective joint and the leg joint on the lowest floor (under the floor) of a building, a structure has been disclosed in which the lower part of the collective joint is used as a receiving port and the length of the vertical pipe inserted into the receiving port is adjusted in order to reduce the space occupied by the drainage pipe (Patent Document 1). Also, a structure has been disclosed that allows the length of the standpipe between the floor slab assembly joint and the leg joint to be changed in accordance with the thickness of the floor slab in the building (Patent Document 2). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2016-69974 [Patent Document 2] Japanese Patent Application Laid-Open No. 2016-204837 Summary of the Invention [Problem to be solved by the invention]

[0004] In the structure described in Patent Document 1, the upper joint is used as the receiving port. Therefore, if a gap occurs between the receiving port and the standpipe, drainage water may leak through the gap, reducing the watertightness. Furthermore, the structure of Patent Document 2 has a problem in that the collective joint, the connection member, and the standpipe are all separate members, which means that there are many members and the cost is high.

[0005] The present invention has been made in view of the above-mentioned circumstances, and an object of the present invention is to provide a low-cost collective joint that is less likely to leak wastewater from the connection portion. [Means for solving the problem]

[0006] In order to solve the above problems, the present invention proposes the following means. The manifold of the present invention comprises a manifold section having a vertical pipe connection section provided above, a horizontal pipe connection section provided to the side, and a straight pipe connection section provided below, and a straight pipe section connected to the straight pipe connection section, the upper end of which is an enlarged diameter receiving section, and the straight pipe connection section is arranged inside the receiving section.

[0007] According to this invention, the straight pipe connection portion is disposed inside the socket portion. Here, a comparison is made between a case where the upper collecting portion is the socket and a case where the lower straight pipe portion is the socket. When the upper collection section is a receiving port, if a gap occurs between the receiving port and the straight pipe section, the wastewater that moves into the gap will move downward due to gravity. At this time, the receiving port located on the upper side is located further outward than the straight pipe section located on the lower side, so the straight pipe section cannot block the wastewater. As a result, the wastewater leaks out through the gap.

[0008] In contrast, if the straight pipe section located at the bottom is the inlet, even if wastewater moves into the gap as described above, it will not move upward against gravity. In other words, by designing the straight pipe connection section of the collecting section to be inserted inside the inlet section, wastewater can be prevented from leaking through the gap even if a gap occurs between the straight pipe connection section and the inlet section. Therefore, watertightness can be ensured compared to when the collecting section located at the top is the inlet.

[0009] Furthermore, the upper end of the straight pipe section is an expanded socket section. In other words, the socket section is integrally molded with the upper end of the straight pipe section. This allows the assembly joint to consist only of the assembly section and the straight pipe section. This reduces the number of parts, thereby reducing costs.

[0010] A tapered portion may be provided between the socket portion and the straight pipe portion.

[0011] According to this invention, a tapered section is provided between the receiving section and the straight pipe section, which prevents the flow of wastewater flowing through the manifold from being disturbed when it comes into contact with the enlarged diameter section, thereby further improving drainage performance.

[0012] Furthermore, a protrusion may be provided on the inside of the straight pipe portion.

[0013] In this type of joint, when a large amount of wastewater flows into the joint at once, the flow rate of the wastewater flowing through the joint and the piping increases, which can result in negative pressure inside the piping. This can cause problems such as the trap seal installed in the building's facilities being drawn in, and the pipes may not be able to provide sufficient drainage performance. According to this invention, a protrusion is provided on the inside of the enlarged diameter section. Therefore, the flow rate of the wastewater can be reduced by the amount of the protrusion provided inside the straight pipe section. This prevents the above-mentioned problems from occurring.

[0014] Further, a sound insulating cover may be provided on the outside of the straight pipe connection portion and the straight pipe portion.

[0015] According to this invention, a sound-insulating cover is provided on the outside of the straight pipe connection portion and the straight pipe portion. This makes it possible to prevent the drainage noise generated when drainage flows inside the manifold from propagating to the outside, thereby ensuring the sound insulation of the manifold.

[0016] In addition, the piping structure of the present invention is a piping structure used in the lowest floor of a building, and comprises a vertical pipe, a horizontal branch pipe, a leg joint, and the collecting joint, the vertical pipe and the horizontal branch pipe are connected to the collecting part of the collecting joint, and the lower end of the straight pipe part of the collecting joint is connected to the leg joint.

[0017] According to this invention, the lower end of the straight pipe section of the manifold according to the present invention is connected to the leg joint. This makes it possible to improve watertightness and reduce costs in a piping structure equipped with a manifold that can be adjusted to suit the construction site, such as the space under the floor and the thickness of the floor slab. [Effects of the Invention]

[0018] According to the present invention, it is possible to provide a low-cost collective joint that prevents wastewater from leaking from the connection portion. [Brief explanation of the drawings]

[0019] [Figure 1] 1 is a schematic diagram showing a location where a piping structure according to an embodiment of the present invention is installed. [Figure 2] FIG. 2 is a cross-sectional view showing the installation location of a group joint according to one embodiment of the present invention. [Figure 3] 3 is a cross-sectional view showing a case where a tapered section is provided in a straight pipe section of the joint assembly of FIG. 2. FIG. [Figure 4] 3 is a cross-sectional view showing a case where a protrusion is provided on a straight pipe portion of the collective joint of FIG. 2. FIG. DETAILED DESCRIPTION OF THE INVENTION

[0020] Hereinafter, a group joint 200 and a piping structure 1000 according to one embodiment of the present invention will be described with reference to the drawings. As shown in Fig. 1, the piping structure 1000 of this embodiment is an example applied to a multi-story building (building) such as a high-rise apartment building or a commercial building. In this type of building, wastewater discharged from sanitary equipment (drainage facilities) such as toilets, vanities, and sinks on each floor flows into a standpipe 100 constituting a drainage channel via a horizontal branch pipe 300 (not shown). The piping structure 1000 of this embodiment is intended to be installed particularly on the lowest floor of the building. As shown in FIG. 1, the piping structure 1000 includes a standpipe 100, a joint collection joint 200, a horizontal branch pipe 300, a leg joint 400, and a horizontal main pipe 500.

[0021] The standpipes 100 are installed vertically in the building. Wastewater from each drainage facility flows down along the standpipes 100 to the lowest floor of the building, then flows into a horizontal main pipe 500 via a collecting joint 200 and a leg joint 400 connected to the lower end of the standpipe 100, and is finally sent to a main sewer pipe, a septic tank, etc. The piping structure 1000 discharges wastewater from the drainage facility on each floor to the outside of the building. The riser pipe 100 collects and directs the wastewater from the drainage facilities installed on each floor downward. The lower end of the riser pipe 100 installed on the lowest floor of the building is connected to a collecting joint 200.

[0022] The collecting joint 200 is provided on the lowest floor of the building and collects the wastewater flowing in from the standpipe 100 and the wastewater flowing in from the horizontal branch pipe 300. The wastewater collected by the collecting joint 200 flows down to the leg joint 400. In addition, a sound-insulating cover 240 and a fire-resistant material 250 are provided around the collecting joint 200 (details will be described later).

[0023] The horizontal branch pipe 300 is installed horizontally in the building. The horizontal branch pipe 300 is connected to each drainage member installed in the building. This allows the drainage water generated on each floor of the building to be collected. In this embodiment, the horizontal branch pipe 300 is connected to a joint assembly 200 provided on the lowest floor of the building.

[0024] The leg joint 400 is installed under the floor of the building. The leg joint 400 has an L-shape and converts wastewater flowing down from above into horizontal movement. In this embodiment, one end of the leg joint 400 is connected to a straight pipe section 220 (described later) of the collection joint 200. The other end of the leg joint 400 is connected to a horizontal main pipe 500. A support leg 410 is formed near the center of the curved pipe section of the leg joint 400, and this support leg 410 is supported by support fittings or the like (not shown). The horizontal main pipe 500 is installed under the floor of the building and is connected to a sewer main pipe, a septic tank, or the like (not shown).

[0025] The collecting joint 200 includes a collecting section 210 and a straight pipe section 220. The above-mentioned standpipe 100 and horizontal branch pipe 300 are connected to the collecting section 210. The wastewater that flows into the collecting section 210 moves to the straight pipe section 220 and then moves to the leg joint 400 connected to the straight pipe section 220. The collecting section 210 includes a main body section 211 , a vertical pipe connecting section 212 , and a horizontal pipe connecting section 213 .

[0026] The main body 211 is located in the center of the components provided in the collecting section 210. In this embodiment, a vertical pipe connecting section 212 is provided above the main body 211, and a horizontal pipe connecting section 213 is provided on one side. A deflector plate 211A is integrally formed on the inside of the main body 211, and a straight pipe connecting section 211B is integrally formed on the lower part of the main body 211. The straight pipe connecting section 211B is formed so that the inner diameter gradually increases toward the straight pipe section 220.

[0027] The deflector plate 211A is a protruding portion integrally formed on the inside of the main body portion 211. The deflector plate 211A is provided on the main body portion 211 above the portion where the horizontal pipe connecting portion 213 is provided. Here, when a large amount of wastewater flows into the collecting section 210, the flow rate of the wastewater flowing through the collecting joint 200 and the piping increases, which can result in negative pressure inside the piping. In contrast, when the wastewater that has flowed into the main body 211 from the standpipe 100 comes into contact with the deflection plate 211A, the wastewater flowing inside the collecting joint 200 deflects. This makes it easier to ventilate the collecting joint 200 and the standpipe 100, and serves to reduce pressure fluctuations inside the piping structure 1000. The number of deflection plates 211A provided in main body portion 211 can be selected arbitrarily. For example, they may be provided in only one location, or multiple deflection plates 211A may be provided at intervals on the inner circumferential surface of main body portion 211. Moreover, deflection plates 211A may be provided inside mounting portion 212A of standpipe connecting portion 212, which will be described later.

[0028] The straight pipe connecting portion 211B is inserted into the straight pipe portion 220 to connect the main body portion 211 and the straight pipe portion 220. The straight pipe connecting portion 211B is integrally molded at the lower portion of the main body portion 211. In this embodiment, adhesive is preferably used to attach the straight pipe connecting portion 211B and the straight pipe portion 220.

[0029] Here, injection molding using polyvinyl chloride resin is preferably used to form the main body portion 211. In this case, if a gate required for injection molding is provided in the straight pipe connecting portion 211B, there is a risk that the gate mark will interfere with the adhesion between the straight pipe connecting portion 211B and the straight pipe portion 220. For this reason, it is preferable that the injection molding gate in the main body portion 211 be provided so as to avoid the straight pipe connecting portion 211B. Note that the main body portion 211 may be transparent. In this case, the joining state with the vertical pipe connecting portion 212 and the horizontal pipe connecting portion 213 can be easily confirmed. The inner diameter of the straight pipe connecting portion 211B is preferably the same as or larger than the inner diameter of the straight pipe portion 220 (described later). Also, the outer diameter of the straight pipe connecting portion 211B is preferably the same as or larger than the outer diameter of the straight pipe portion 220.

[0030] The riser pipe connecting part 212 is disposed above the main body part 211. In this embodiment, the riser pipe connecting part 212 includes an attachment part 212A, a cover part 212B, and a rubber ring 212C. The attachment portion 212A is a cylindrical member that connects the standpipe connection portion 212 and the main body portion 211. For example, polyvinyl chloride resin is preferably used for the mounting portion 212A. For example, adhesive is preferably used for mounting the riser pipe connecting portion 212 and the main body portion 211. In addition, a rubber ring 212C is provided on the inner circumferential surface of the mounting portion 212A.

[0031] The rubber ring 212C is an annular part that is provided on the inner peripheral surface of the mounting portion 212A and that comes into direct contact with the standpipe 100 connected to the standpipe connecting portion 212. This serves to eliminate any gaps between the standpipe 100 connected to the standpipe connecting portion 212 and prevent drainage water from leaking. For the rubber ring 212C, a rubber material that is typically used in drainage equipment, such as ethylene-propylene-diene rubber (EPDM), is preferably used.

[0032] The cover portion 212B is an annular member provided to cover the end portions of the attachment portion 212A and the rubber ring 212C, thereby preventing the rubber ring 212C from falling off the attachment portion 212A. For example, polyvinyl chloride resin is preferably used for the cover portion 212B.

[0033] The riser pipe connecting part 212 and the riser pipe 100 are connected by inserting the lower end of the riser pipe 100 into the vertical pipe connecting part. For this reason, it is preferable that the inner diameter of the rubber ring 212C is smaller than the outer diameter of the riser pipe 100. As a result, the riser pipe 100 is tightened by the elastic force of the rubber ring 212C generated when the riser pipe 100 is inserted, and the riser pipe connecting part 212 and the riser pipe 100 are fixed. Alternatively, the inserted standpipe 100 and the standpipe connecting portion 212 may be fixed by adhesive. In this case, the rubber ring 212C may not be provided.

[0034] Any method can be used to check the insertion amount of the riser pipe 100 into the riser pipe connecting portion 212. For example, a method can be used in which a marking indicating a specified insertion depth is applied to the riser pipe 100 and the position of the marking is visually checked during insertion. Alternatively, each component part of the riser pipe connecting part 212 may be made transparent, so that the insertion depth of the riser pipe 100 inside the riser pipe connecting part 212 can be visually confirmed. In this case, it is possible to more easily confirm the insertion depth.

[0035] The horizontal pipe connection portion 213 is disposed on the side of the main body portion 211. The number of horizontal pipe connection portions 213 provided in the joint collector 200 can be set arbitrarily according to the conditions of the construction site, the size of the joint collector 200, etc. In this embodiment, the horizontal pipe connecting portion 213 includes an attachment portion 213A, a cover portion 213B, and a rubber ring 213C. The horizontal pipe connecting portion 213 may be provided with a stopper that restricts the insertion of the horizontal branch pipe 300. In this case, the stopper is provided so as to be located inside or outside the main body portion 211. If the stopper is located outside the main body portion 211 and the horizontal pipe connecting portion 213 is transparent, the insertion of the horizontal branch pipe 300 can be easily confirmed from the outside. Furthermore, if the stopper is located inside the main body portion 211, the horizontal branch pipe 300 can be made longer, making it easier to achieve an appropriate drainage gradient.

[0036] The attachment portion 213A is a cylindrical member that connects the horizontal pipe connection portion 213 and the main body portion 211. For example, polyvinyl chloride resin is preferably used for the mounting portion 213A. For example, adhesive is preferably used for mounting the horizontal pipe connecting portion 213 and the main body portion 211. In addition, a rubber ring 213C is provided on the inner circumferential surface of the mounting portion 213A.

[0037] The rubber ring 213C is an annular part that is provided on the inner peripheral surface of the mounting portion 213A and that comes into direct contact with the horizontal pipe connected to the horizontal pipe connecting portion 213. This serves to eliminate gaps with the horizontal pipe connected to the horizontal pipe connecting portion 213 and prevent drainage water from leaking. For the rubber ring 213C, a rubber material that is normally used in drainage equipment, such as ethylene-propylene-diene rubber (EPDM), is preferably used.

[0038] The cover portion 213B is an annular member provided to cover the end portions of the attachment portion 213A and the rubber ring 213C, thereby preventing the rubber ring 213C from falling off the attachment portion 213A. For example, polyvinyl chloride resin is suitably used for the cover portion 213B.

[0039] The horizontal pipe connecting part 213 and the horizontal pipe are connected by inserting the lower end of the horizontal pipe into the vertical pipe connecting part. For this reason, it is preferable that the inner diameter of the rubber ring 213C is smaller than the outer diameter of the horizontal pipe. This allows the elastic force of the rubber ring 213C generated when the horizontal pipe is inserted to tighten the horizontal pipe, fixing the horizontal pipe connecting part 213 and the horizontal pipe. Alternatively, the inserted horizontal pipe may be fixed by adhesive to the horizontal pipe connecting portion 213. In this case, the rubber ring 213C may not be provided.

[0040] Any method can be used to check the insertion depth of the horizontal branch pipe 300 into the horizontal pipe connecting portion 213. For example, a method can be used in which a marking indicating a specified insertion depth is applied to the horizontal branch pipe 300, and the position of the marking is visually checked during insertion. Alternatively, each component of the horizontal pipe connecting portion 213 may be made transparent, so that the insertion depth of the horizontal branch pipe 300 inside the horizontal pipe connecting portion 213 can be visually confirmed. In this case, the insertion depth can be more easily confirmed.

[0041] The straight pipe section 220 is a member provided below the collective joint 200. The above-mentioned straight pipe connecting section 211B is connected to the upper end of the straight pipe section 220. The lower end of the straight pipe section 220 is connected to the leg joint 400. Straight pipe section 220 is a linear cylinder with a substantially constant inner diameter and cross-sectional area from its upper end to its lower end, and socket section 220A is integrally formed at the upper end of straight pipe section 220. Straight pipe connecting section 211B is connected to straight pipe section 220 by being inserted into socket section 220A. Straight pipe connecting section 211B and socket section 220A are preferably attached by, for example, adhesive, but a rubber ring may also be provided inside socket section 220A and the straight pipe connecting section 211B may be inserted into socket section 220A to connect them via the rubber ring.

[0042] Methods for forming the straight pipe section 220 and the socket section 220A include socket processing (diameter expansion) of an extrusion-molded pipe, injection molding, and blow molding. Polyvinyl chloride resin is preferably used for the straight pipe section 220. While extrusion molding results in a uniform inner and outer diameter for all parts of the straight pipe section 220, injection molding results in differences in wall thickness and inner and outer diameters due to draft gradients in the axial direction of the straight pipe section 220. Therefore, processing an extrusion-molded pipe into a socket is preferably used. In addition, a straight pipe with a receiving portion 220A may be formed by injection molding or blow molding, and then heated to form protrusions on the inner surface of the straight pipe portion 220 or recesses on the outer surface of the straight pipe portion 220, as described below.

[0043] As shown in Fig. 2, the boundary between the straight pipe section 220 and the socket section 220A may be stepped (a flat stepped surface), but it is more preferable to provide a tapered section 220B between the socket section 220A and the straight pipe section 220, as shown in Fig. 3. In particular, if the inner diameter of the straight pipe section 220 is smaller than the inner diameter of the straight pipe connecting section 211B of the manifold 200, it is possible to prevent the flow of wastewater from the socket section 220A to the straight pipe section 220 from being disturbed. This improves drainage performance.

[0044] 4, an annular protrusion 220C may be provided at the boundary between the straight pipe section 220 and the inlet section 220A. In the collective joint 200 shown in FIGS. 2 and 3, when a large amount of wastewater flows into the collective joint 200 at once, the flow rate of the wastewater flowing through the collective joint 200 and the piping increases, which can result in negative pressure inside the piping structure 1000. In this case, when the wastewater passes through the protrusion 220C, the flow rate of the wastewater decreases. In other words, the flow rate of the wastewater flowing through the piping structure 1000 can be reduced, preventing negative pressure inside the piping. When providing the protrusion 220C, a recess may be provided on the outer surface of the straight pipe section 220, and the protrusion 220C may be formed on the inner surface of the straight pipe section 220 corresponding to the recess.

[0045] It is preferable that the inner surface of the straight pipe portion 220 below the tapered portion 220B and the protruding portion 220C is free from protrusions, steps, deflection plates, etc., and that the inner surface is a smooth cylindrical shape.

[0046] Injection molding is preferably used to form the protrusion 220C. In this case, if a gate mark from injection molding is present on the outer surface of the straight pipe section 220, particularly in the area that comes into contact with the socket of the leg joint 400 when the straight pipe section 220 is inserted into the leg joint 400, a gap may form between the gate mark and the socket of the leg joint 400, which may reduce watertightness. For this reason, it is preferable to form the injection molding gate so as to avoid the outer surface of the straight pipe section 220. Furthermore, to avoid affecting drainage and the connection with the straight pipe connection section, it is preferable to form the gate so as to avoid the inner surfaces of the straight pipe section and the socket section.

[0047] In view of the above, the following are examples of locations where a gate may be set when injection molding the straight pipe section 220. That is, for example, a gate may be provided on the end face of the lower end of the straight pipe section 220 or around the lower end, so that no gap is created between the socket of the leg joint 400 and the outer surface of the straight pipe section 220. Furthermore, as described above, when connecting the straight pipe section 220 to the leg joint 400, the lower end of the straight pipe section 220 is appropriately cut off, so a gate may be provided only at the lower end of the straight pipe section 220.

[0048] Furthermore, since the leg joint 400 is not connected, a gate may be provided on the outer surface near the upper end of the straight pipe section 220. For the same reason, a gate may be provided at the location where the fire-resistant material 250 is attached to the straight pipe section 220. A gate may also be provided on the outer surface of the receiving port section 220A. Furthermore, a plurality of gates may be provided, and a plurality of gate marks may be formed on the outer surface of the straight pipe portion 220.

[0049] When the straight pipe section 220 is blow molded, no gate marks are formed on the outer surface of the straight pipe section 220, but a parting line parallel to the pipe axis of the straight pipe section 220 is formed on the outer surface of the straight pipe section 220. In addition, the upper and lower end surfaces of the straight pipe section 220 are cut surfaces.

[0050] The size of straight pipe section 220 can be selected arbitrarily depending on the conditions of the construction site, but nominal diameters of 100 (outer diameter 114 mm), 125 (outer diameter 140 mm), or 150 (outer diameter 165 mm) are particularly preferred, with the outer diameter of straight pipe section 220 being set appropriately within the range of 114 mm to 140 mm. Furthermore, the inner diameter of socket section 220A is preferably the same as the outer diameter of straight pipe connecting section 211B, and more preferably the same as or larger than the outer diameter of straight pipe section 220. Moreover, it is preferable that the inner diameter of the straight pipe portion 220 is the same as or larger than the inner diameter of the standpipe 100 . Therefore, in one embodiment of the collecting joint 200, the inner diameters of the parts that make up the collecting joint 200 are, in order of smallest inner diameter, the stand pipe 100, the straight pipe section 220, the straight pipe connecting section 211B, and the receiving section 220A. This makes it difficult for the drainage water to clog at the straight pipe connecting section 211B located at the bottom of the collecting section 210 where the drainage water from the stand pipe 100 and the horizontal pipe connecting section 213 join, allowing for smooth drainage from the straight pipe connecting section 211B to the downstream side.

[0051] Furthermore, the length from the open end of the receiving portion 220A to the lower end of the straight pipe portion 220 is preferably 600 mm or less. A length of 500 mm or less is more preferable, and a length of 400 mm or less is optimal. Setting the length below the upper limit not only improves ease of installation during construction and transportability during transportation, but also facilitates molding of the straight pipe portion 220 by injection molding or blow molding, and facilitates the process of processing the extruded pipe into the receiving portion 220A, resulting in excellent productivity. In particular, when molding the straight pipe portion 220 by injection molding, the length from the open end of the receiving portion 220A to the lower end of the straight pipe portion 220 is preferably 500 mm or less to ensure that the wall thickness of the straight pipe portion 220 is a predetermined thickness even when a draft angle is provided to facilitate the removal of the mold located on the inner surface of the straight pipe portion 220. Furthermore, the length from the open end of the receiving portion 220A to the lower end of the straight pipe portion 220 is preferably 200 mm or more, and more preferably 300 mm or more. By making it equal to or greater than the above lower limit, the riser pipe 100 and the leg joint 400 can be directly connected without any other joints even if the slab S is thick. Furthermore, when connecting the straight pipe section 220 to the leg joint 400, the length can be adjusted appropriately by cutting the straight pipe section 220 to fit the dimensions of the construction site.

[0052] As shown in FIG. 2, the connection between the straight pipe connection portion 211B and the socket portion 220A is arranged so as to be located inside the through-hole in the slab S of the building. After installing the collecting joint 200 in this manner, the through-hole in the slab S is filled with a filler such as mortar M or rock wool. It is preferable that the upper end of the socket portion 220A does not exceed the upper surface of the slab S. This reduces the distance between the horizontal pipe connection portion 213 in the collecting joint 200 and the slab S. This makes it easier to achieve a drainage gradient for the horizontal branch pipe 300 connected to the collecting joint 200. In this embodiment, a sound-insulating cover 240 and a fire-resistant material 250 are provided on the outside of the collecting joint 200.

[0053] The sound-insulating cover 240 serves to prevent the sound generated by the drainage water flowing inside the joint assembly 200 from propagating to the outside. In addition, by being provided in close contact with the periphery of the connection between the straight pipe connection part 211B and the straight pipe part 220, the sound-insulating cover 240 also serves to complement the waterproofing of the connection part. A structure including a sound absorbing material provided on the inner layer side and a sound insulating material provided on the outer layer (not shown) is preferably used for sound insulating cover 240. Examples of sound absorbing materials include inorganic fibers such as glass wool and rock wool, organic fibers such as felt, and porous materials such as urethane, and a multi-layer structure in which aluminum foil or glass fiber is laminated to improve fire resistance can be used. As shown in FIG. 2, it is preferable that the upper end of the sound-insulating cover 240 is provided above the socket portion 220A, and the lower end is provided below the lower surface portion of the slab S. A rubber ring (not shown) may be provided on the outer surface of the upper end of the sound insulating cover 240 to prevent water from entering between the straight pipe connecting portion 211B and the sound insulating cover 240.

[0054] The fire-resistant material 250 is a member provided around the straight pipe section 220 at the location where the collective joint 200 is embedded in the slab S. The fire-resistant material 250 may be provided in a ring shape around the entire periphery of the straight pipe section 220, or multiple fire-resistant materials 250 may be provided at intervals, or multiple fire-resistant materials 250 may be stacked. The fire-resistant material 250 is preferably a fire-resistant sheet made of a heat-expandable fire-resistant material such as heat-expandable graphite and a binder resin, a fire-resistant putty made of a mixture of a binder resin and an inorganic material, or a ring-shaped fire-resistant member. The fire-resistant material 250 thermally expands during a building fire, deforming the straight pipe section 220 of the joint assembly 200 and closing the piping structure 1000. This prevents smoke from moving from inside the piping structure 1000 to upper floors during a fire.

[0055] As described above, the fire-resistant material 250 is provided at a portion embedded in the slab S. In this case, if the fire-resistant material 250 is provided on the outer surface of the receiving portion 220A, the opening diameter of the slab S must be adjusted to the sum of the outer diameter of the receiving portion 220A and the thickness of the fire-resistant material 250, which results in the opening diameter of the slab S becoming larger than necessary. For this reason, the fire-resistant material 250 is preferably provided below the receiving portion 220A in the straight pipe portion 220, and it is preferable that the outer diameter of the fire-resistant material 250 provided in the straight pipe portion 220 does not exceed the outer diameter of the receiving portion 220A. 3 or 4, when tapered portion 220B or protruding portion 220C is provided at the boundary between receiving portion 220A and straight pipe portion 220, fire-resistant material 250 may overlap tapered portion 220B or protruding portion 220C on the outer surface of the receiving portion. In other words, fire-resistant material 250 may be provided on the outer surface of tapered portion 220B or the outer surface of protruding portion 220C (at the same position in the height direction in the pipe axis direction of straight pipe portion 220). As described above, the straight pipe section 220 is cut appropriately to match the position of the connection with the leg joint 400. Therefore, in order to increase the range of the cuttable straight pipe section 220, it is preferable that the height of the fireproof material 250 (the length in the thickness direction of the slab S) be in the range of 20 mm to 80 mm. The fire-resistant material 250 only needs to be provided in a portion that is embedded in the slab S, and a portion of the fire-resistant material 250 may be located outside the through-hole of the slab S.

[0056] As described above, according to the collective joint 200 of this embodiment, the straight pipe connection portion 211B is disposed inside the socket portion 220A. Here, a comparison is made between the case where the collective portion 210 located on the upper side is the socket and the case where the straight pipe portion 220 located on the lower side is the socket. When the upper collecting section 210 is a receiving port, if a gap occurs between the receiving port and the straight pipe section 220, the wastewater that has moved into the gap will move downward due to gravity. At this time, the upper receiving port is located further outward than the lower straight pipe section 220, so the straight pipe section 220 cannot block the wastewater. As a result, there is a risk that the wastewater will leak out from the gap.

[0057] In contrast, if the straight pipe section 220 located at the bottom is a receiving port, even if wastewater moves into the gap as described above, it will not move upward against gravity. In other words, by configuring the straight pipe connection section 211B of the collecting section 210 to be inserted inside the receiving port section 220A, even if a gap occurs between the straight pipe connection section 211B and the receiving port section 220A, it is possible to prevent wastewater from leaking through the gap. Therefore, compared to when the collecting section 210 located at the top is a receiving port, watertightness can be ensured.

[0058] Furthermore, the upper end of the straight pipe section 220 is a socket section 220A with an expanded diameter. In other words, the socket section 220A is integrally formed with the upper end of the straight pipe section 220. This allows the collective joint 200 to be composed of only the collective section 210 and the straight pipe section 220. Therefore, by reducing the number of parts, costs can be reduced.

[0059] In addition, a tapered section 220B is provided between the receiving section 220A and the straight pipe section 220. This prevents the flow of wastewater flowing through the joint assembly 200 from being disturbed when it comes into contact with the enlarged diameter section, thereby further improving drainage performance.

[0060] In this type of joint 200, when a large amount of wastewater flows into the joint 200 at once, the flow rate of the wastewater flowing through the joint 200 and the piping increases, which can result in negative pressure inside the piping. This can cause problems such as the trap seal installed by the building's facilities being drawn in, and sufficient drainage performance can be prevented. Furthermore, a protrusion is provided on the inside of the enlarged diameter portion. Therefore, the flow rate of the wastewater can be reduced by the amount of the protrusion provided inside the straight pipe portion 220. This makes it possible to prevent the above-mentioned problems from occurring.

[0061] In addition, a sound-insulating cover 240 is provided on the outside of the straight pipe connection portion 211B and the straight pipe portion 220. This makes it possible to prevent drainage noise, which is generated when drainage water flows inside the collective joint 200, from propagating to the outside. Therefore, the sound-insulating properties of the collective joint 200 can be ensured.

[0062] Furthermore, the lower end of the straight pipe section 220 of the collective joint 200 according to the present invention is connected to the leg joint 400. This allows the piping structure 1000 equipped with the collective joint 200, which can be adjusted to suit the construction site, such as the space under the floor and the thickness of the floor slab, to have improved watertightness and further reduce costs.

[0063] The technical scope of the present invention is not limited to the above-described embodiments, and various modifications can be made without departing from the spirit of the present invention. For example, the attachment portion 212A of the vertical pipe connecting portion 212 and the attachment portion 213A of the horizontal pipe connecting portion 213 may be integrally formed with the main body portion 211. Furthermore, the main body portion 211 may be composed of a plurality of members, and a plurality of main body portions 211 may be provided between the vertical pipe connecting portion 212 and the straight pipe portion 220. In this case, the main body portions 211 may be connected vertically, and a horizontal pipe connecting portion 213 may be provided on the side of each of the plurality of main body portions 211. The material of the straight pipe portion 220 may contain a thermally expandable fire-resistant material (thermally expandable graphite). In addition, a detachable sound-insulating cover may be provided around the assembly portion 210 and the main body portion 211. This allows the sound-insulating cover to be installed on the assembly portion 210 and the main body portion 211 even after the assembly joint 200 is installed in the through-hole of the slab S. In addition, a soundproof cover may be provided around the horizontal pipe connection part 213, and vibration-damping material may be provided at a position where the horizontal pipe connection part 213 faces the upper surface of the slab S. This makes it possible to prevent sound and vibration generated at the horizontal pipe connection part 213 from being transmitted to the slab S. Alternatively, the straight pipe connecting portion 211B of the collecting portion 210 may be formed long, instead of the straight pipe portion 220, and the length may be adjusted appropriately by cutting the long straight pipe connecting portion 211B. In this case, the straight pipe connecting portion 211B may be formed to a length equal to or greater than the straight pipe portion 220 or the thickness of the slab S. Furthermore, the fire-resistant material 250 may be provided around the straight pipe connection portion 211B of the assembly portion 210, or around the socket portion 220A, rather than around the straight pipe portion 220. In particular, when the straight pipe portion 220 is disposed inside the slab S and mortar M, providing the fire-resistant material 250 around the straight pipe connection portion 211B or the socket portion 220A can improve fire resistance. The reason for improving fire resistance will be explained below. The straight pipe portion 220 is positioned below the straight pipe connection portion 211B and the socket portion 220A in the vertical direction, and the outer diameter of the straight pipe portion 220 is smaller than the outer diameters of the straight pipe connection portion 211B and the socket portion 220A. Therefore, the inner diameter of the mortar M at the position of the straight pipe portion 220 is smaller than the inner diameter of the mortar M at the position of the straight pipe portion 220. Therefore, when the fire-resistant material 250 wrapped around the straight pipe connection portion 211B and the socket portion 220A expands during a fire, the fire-resistant material 250 gets caught on the inner surface of the mortar M at the position of the straight pipe portion 220, and the expanded fire-resistant material 250 does not fall off, making it easier to block the through-hole in the slab S. As a result, fire resistance is improved. Furthermore, the fireproof material 250 may not be directly installed around the straight pipe section 220, but may be provided on the inside or outer surface of the sound-insulating cover 240 at a location located within the through-hole of the slab S. Furthermore, the fire-resistant material 250 may be embedded inside the straight pipe section 220, or the straight pipe section 220 and the fire-resistant material 250 may be integrated. For example, when the straight pipe section 220 is formed by injection molding, the ring-shaped fire-resistant material 250 is placed in a mold, and then the resin that forms the straight pipe section 220 is injected into the mold, so that the fire-resistant material 250 is embedded in the straight pipe section 220. Even in this case, the fire-resistant material 250 is placed at the upper end of the straight pipe section 220 or inside the receiving portion 220A so as to be located inside the through-hole of the slab S. Furthermore, when the straight pipe section 220 is formed by extrusion molding, for example, a fire-resistant resin layer containing a heat-expandable fire-resistant material, which becomes the fire-resistant material 250, and a non-fire-resistant resin layer not containing a heat-expandable fire-resistant material are extruded into a tubular state in a laminated state, so that the straight pipe section 220 and the fire-resistant material 250 are integrally formed. In this case, the fire-resistant material 250 is disposed throughout the entire straight pipe section 220. Note that in this case, since the straight pipe section 220 is heated to form the receiving portion 220A, it is preferable that the amount of the heat-expandable fire-resistant material, such as heat-expandable graphite, contained in the heat-expandable fire-resistant material 250 is not too much relative to the resin constituting the straight pipe section 220, and that the expansion start temperature of the heat-expandable fire-resistant material is not too low. For example, the fire-resistant material 250 is preferably a tubular material made of a thermally expandable resin composition containing 2 to 18 parts by mass of thermally expandable graphite having an expansion starting temperature of 210°C or higher per 100 parts by mass of polyvinyl chloride resin, and molded integrally with the straight pipe portion 220. It is more preferable that the thermally expandable resin composition contains 3 to 15 parts by mass of thermally expandable graphite having an expansion starting temperature of 220°C or higher. In addition, the connection portion between straight pipe connection portion 211B and receiving portion 220A may be positioned so as to be located outside the slab S and mortar M of the building. For example, if horizontal branch pipe 300 is located at a high position, the upper end of receiving portion 220A may be positioned above the upper surface of slab S so that horizontal branch pipe 300 located at a high position can be connected to horizontal pipe connection portion 213, or if straight pipe connection portion 211B is long, the connection portion between straight pipe connection portion 211B and receiving portion 220A may be positioned below the lower surface of slab S.

[0064] In addition, within the scope of the spirit of the present invention, the components in the above-described embodiments may be replaced with well-known components as appropriate, and the above-described modified examples may be combined as appropriate. [Explanation of symbols]

[0065] 100 Standpipe 200 Collective Joint 210 Assembly area 211B straight pipe connection 212 Standpipe Connection 213 Horizontal pipe connection 220 Straight pipe section 220A socket part 220B tapered section 240 Soundproof Cover 300 Lateral branch pipe 400 Leg joint 1000 Piping structure

Claims

1. A manifold comprising a vertical pipe connection section located at the top, a horizontal pipe connection section located on the side, and a straight pipe connection section located at the bottom, A straight pipe section connected to the aforementioned straight pipe connection section, Equipped with, The aforementioned manifold and the aforementioned straight pipe section are formed of polyvinyl chloride resin. The upper end of the straight pipe section is an enlarged socket section, the straight pipe connecting section is positioned inside the socket section, and the socket section and the straight pipe connecting section are bonded together. The receiving portion is integrally molded with the upper end of the straight pipe portion, and a tapered portion is provided between the receiving portion and the straight pipe portion. In the axial direction of the pipe, the straight pipe section is longer than the socket section. The inner diameter of the straight pipe connection is larger than the inner diameter of the straight pipe section. Sound-insulating covers are provided on the straight pipe connection and on the outside of the straight pipe section. The upper end of the sound insulation cover covers the outer circumference of the straight pipe connection portion which is located above the upper end of the receiving portion. The lower end of the sound insulation cover is located above the lower end of the straight pipe section. Manifold joint.

2. In the axial direction of the straight pipe section, the straight pipe section is longer than the receiving section, A projection is provided on the inside of the straight pipe section, and a recess is provided on the outer surface of the straight pipe section corresponding to the position of the projection. The manifold joint according to claim 1.

3. A fire-resistant material provided around any of the straight pipe connection portion, the straight pipe portion, or the receiving portion, The manifold joint according to claim 1 or 2.

4. A fire-resistant material is provided inside the sound-insulating cover. The manifold joint according to claim 1 or 2.

5. The inner surface of the manifold, wherein a flow deflection plate is provided above the horizontal pipe connection portion, A manifold joint according to any one of claims 1 to 4.

6. A method for manufacturing a manifold according to any one of claims 1 to 5, The aforementioned straight pipe section is formed by blow molding, The aforementioned assembly portion is formed by injection molding. The straight pipe section and the straight pipe connection section are attached by adhesive. A method for manufacturing manifold joints.

7. Rectifier and Transverse branch tubes, Leg joint and, A manifold joint according to any one of claims 1 to 5, A building piping structure equipped with, The manifold portion of the manifold joint is connected to the riser pipe and the horizontal branch pipe. The lower end of the straight pipe section of the aforementioned manifold joint is connected to the leg joint. Piping structure.

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