Collective joint and drainage system

Abstract

To provide a collective joint and a drainage system capable of suppressing generation of noise and vibration even when a large amount of drainage water with strong momentum flows in concentratedly from a plurality of siphon drain pipes.SOLUTION: A collective joint 10 installed in a through hole H of a floor slab S and to which a siphon drain pipe P4 is connected comprises an upper joint portion 11 provided with an upper vertical pipe socket 19 connected to a vertical pipe P1 located above the floor slab S, a lower joint portion 12 provided with a lower vertical pipe socket 18 connected to the vertical pipe P1 located below the floor slab S, and a plurality of protrusions 20 provided on an inner surface of the upper joint portion 11 or the lower joint portion 12, wherein the upper joint portion 11 is provided with a lateral pipe connection port 14 on a side surface thereof, the siphon drain pipe P4 is connected to the upper vertical pipe socket 19 or the lateral pipe connection port 14, and the protrusions 20 are positioned downstream of the upper vertical pipe socket 19 or the lateral pipe connection port 14 to which the siphon drain pipe P4 is connected.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a collection joint and a drainage system. [Background technology]

[0002] Multi-story buildings such as apartment buildings are equipped with drainage systems that guide wastewater from each floor through horizontal pipes to a vertical pipe and then flow down. A system using a siphon drainage pipe is known as a drainage system for multi-story buildings (see, for example, Patent Documents 1 and 2 listed below). This drainage system directs wastewater from each floor's drainage source to a siphon drain pipe via a horizontal pipe, and then the siphon drain pipe joins with a vertical pipe via a collecting joint. The siphon drain pipe uses the head of water obtained by letting the wastewater from each floor flow down to the floor below to drain the wastewater, eliminating the slope of the horizontal pipe. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Publication No. 2020-94612 [Patent Document 2] Japanese Patent Application Laid-Open No. 2017-89369 Summary of the Invention [Problem to be solved by the invention]

[0004] Drainage systems using siphon drainage pipes can discharge wastewater over a wide area on each floor because they do not require a horizontal pipe slope. This allows wastewater from many siphon drainage pipes to merge into a standpipe on the floor below. For example, in Patent Document 1, multiple siphon drainage pipes merge into a receiving port at the top of a merging joint installed on a standpipe. In Patent Document 2, multiple siphon drainage pipes merge via a main pipe into a receiving port installed on the side of the main pipe of the joint.

[0005] In this type of drainage system, the wastewater flowing into the standpipe flows down from the upper floors, so the pressure and speed of the wastewater are strong. Moreover, when a large amount of wastewater flows into one receiving port from multiple siphon drain pipes, it can sometimes result in an excessive inflow. Therefore, in drainage systems using siphon drain pipes, there is a risk that the drainage performance of the collective joint may be exceeded in some areas.Resin collective joints have problems such as vibration and noise due to high flow speeds and high flow rates.

[0006] The present invention has been made in consideration of the above-mentioned circumstances, and aims to provide a collective joint and drainage system that can ensure drainage performance even when a large amount of high-pressure drainage water flows in concentrated from multiple siphon drainage pipes. [Means for solving the problem]

[0007] In order to solve the above problems, the present invention proposes the following means. A collective joint according to one aspect of the present invention is a collective joint that is installed in a through hole in a floor slab and to which a siphon drain pipe is connected, the collective joint comprising an upper joint having an upper riser receiving port that is connected to a riser pipe above the floor slab, a lower joint having a lower riser receiving port that is connected to a riser pipe below the floor slab, and a plurality of protrusions provided on the inner surface of the upper joint or the lower joint, the upper joint having a horizontal pipe connection port on its side, the siphon drain pipe being connected to the upper riser receiving port or the horizontal pipe connection port, and the protrusions being located downstream of the upper riser receiving port or the horizontal pipe connection port to which the siphon drain pipe is connected. [Effects of the Invention]

[0008] According to the present invention, it is possible to provide a collective joint and a drainage system that can ensure drainage performance even when a large amount of high-pressure drainage water flows in concentrated from multiple siphon drainage pipes. [Brief explanation of the drawings]

[0009] [Figure 1]FIG. 1 is a schematic cross-sectional view showing a part of a drainage system using a group joint according to a first embodiment of the present invention. [Figure 2] FIG. 2 is a schematic cross-sectional view showing a part of a drainage system using a collective joint according to a first modified example of the first embodiment. [Figure 3] FIG. 3 is a schematic cross-sectional view showing a part of a drainage system using a collective joint according to a second modified example of the first embodiment. [Figure 4] FIG. 4 is a schematic cross-sectional view showing a part of a drainage system using a group joint according to a second embodiment of the present invention. [Figure 5] FIG. 5 is a schematic cross-sectional view showing a part of a drainage system using a group joint according to a third embodiment of the present invention. [Figure 6] FIG. 6 is a schematic cross-sectional view showing a part of a drainage system using a group joint according to a third embodiment of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0010] Hereinafter, a collective joint and a drainage system using this collective joint according to an embodiment of the present invention will be described with reference to the drawings.

[0011] [First embodiment] The drainage system of this embodiment is applied to multi-story buildings such as high-rise apartment buildings and commercial buildings. The drainage system guides wastewater discharged from multiple drainage equipment (sanitary equipment) on each floor, such as toilets, vanities, and sinks, down to a standpipe via multiple horizontal pipes. In this embodiment, each of the multiple horizontal pipes is connected to the standpipe on the floor below via a siphon drain pipe. For example, wastewater from a horizontal pipe connected to a drainage equipment on the third floor is connected to a vertical pipe on the second floor via a siphon drain pipe. In this case, the wastewater in the horizontal pipe is discharged using hydraulic head pressure, so the multiple horizontal pipes on each floor do not need to be sloped.

[0012] As shown in FIG. 1, the drainage system 1 of this embodiment is a system in which standpipes P1 and P2, a horizontal pipe P3, and multiple siphon drainpipes P4 are connected to a collection joint 10 (drainage collection joint, joint) installed on the floor slab S of each floor. The multiple siphon drainpipes P4 are each connected to the horizontal pipe P3 of the upper floor, and are installed along the standpipe P1, penetrating the floor slab S of the upper floor. The siphon drainpipe P4 has a smaller diameter than the standpipes P1 and P2 and is prone to filling up with water, and the flow path cross-sectional area of ​​the siphon drainpipe P4 is smaller than the flow path cross-sectional area of ​​the standpipes P1 and P2.

[0013] In the embodiment shown in Figure 1, a collective joint 10 is installed in a through hole H formed in a floor slab S, above which a first rise pipe P1 of the floor is provided, and below which a second rise pipe P2 of the floor below is provided.

[0014] The manifold 10 includes an upper joint 11 and a lower joint 12 connected to the upper joint 11 via an intermediate pipe 15. The upper joint 11 has a riser pipe connection portion 13 connectable to a first riser pipe P1, a horizontal pipe connection port 14 protruding from the side of the riser pipe connection portion 13 and connectable to a horizontal pipe P3, and a lower end portion 9 inserted into the through hole H. The joint assembly 10 of this embodiment is made up of an upper joint part 11, a lower joint part 12, and an intermediate pipe 15, which are resin joint components.

[0015] In the following description, the upper joint 11 side of the riser pipe connecting portion 13 along the central axis O of the riser pipe connecting portion 13 will be referred to as the upper side, and the lower joint 12 side will be referred to as the lower side.

[0016] The riser pipe connection portion 13 extends in the vertical direction. The riser pipe connection portion 13 has a damming plate 13a (backflow prevention rib) on its inner surface. The damming plate 13a is installed at an angle of -30° to +30° from the vertical. If the installation angle is inclined more than 20°, the swirling flow of wastewater swirled by the inclined plate may not be sufficiently blocked, resulting in a risk of backflow into the horizontal pipe P3. Furthermore, if the installation angle is inclined more than -30°, the received wastewater may rebound more, which may disrupt the flow of wastewater and increase pressure fluctuations within the pipe. The damming plate 13a's main role is to prevent wastewater from backflowing toward the horizontal pipe P3, and it does not necessarily have to substantially function to obstruct the flow of wastewater from upstream toward the downstream or to deflect the flow of wastewater from upstream.

[0017] The horizontal pipe connection port 14 extends cylindrically from the peripheral wall of the riser pipe connection portion 13 radially outward in a direction perpendicular to the central axis O. In this embodiment, three horizontal pipe connection ports 14 are arranged in the circumferential direction of the riser pipe connection portion 13. Two of the three horizontal pipe connection ports 14 are individually arranged at positions on either side of the central axis O in the radial direction. The remaining horizontal pipe connection ports 14 extend in a radial direction perpendicular to the central axis O, in a direction that forms an angle of 90° in plan view with the direction in which each of the two horizontal pipe connection ports 14 extends. The number and extension direction of the horizontal pipe connection ports 14 are not limited to this embodiment and can be changed as desired. For example, the number of horizontal pipe connection ports 14 does not have to be two or more, and may be one, or none at all. As shown in FIG. 1, a horizontal pipe (horizontal branch pipe) P3 is connected to the tip side of each horizontal pipe connection port 14. The multiple horizontal pipe connection ports 14 are connected to horizontal pipes P3 installed on each floor, i.e., on the floor of the floor slab S.

[0018] The upper joint 11 is made of, for example, a polyvinyl chloride resin composition containing 0.1 to 1.0 parts by weight of non-expandable graphite per 100 parts by weight of polyvinyl chloride resin. The upper joint 11 is obtained, for example, by injecting the polyvinyl chloride resin composition into the cavity of a molding machine.

[0019] An intermediate pipe 15 is connected to the lower end 9 of the joint upper part 11. The outer diameter of the intermediate pipe 15 is smaller than the outer diameter of the riser pipe connecting part 13 in the joint upper part 11. The upper part of the peripheral wall of the intermediate pipe 15 is fitted inside the lower end 9 of the riser pipe connecting part 13.

[0020] The intermediate pipe 15 is made of a resin composition containing, for example, polyvinyl chloride resin and thermally expandable graphite, which is a thermally expandable fire-resistant material. That is, the intermediate pipe 15 is produced by molding the resin composition containing the thermally expandable fire-resistant material. The intermediate pipe 15 is produced, for example, by extrusion molding the resin composition.

[0021] The intermediate pipe 15 may have a single-layer structure in which the entire intermediate pipe 15 is made of a resin composition containing a heat-expandable fire-resistant material, or a multi-layer structure made of multiple layers. In the case of a multi-layer structure, it is sufficient that any one of the layers is made of a resin composition containing a heat-expandable fire-resistant material. For example, if the intermediate pipe 15 has a three-layer structure consisting of a surface layer, an intermediate layer, and an inner layer, the intermediate layer may be made of a resin composition containing a heat-expandable fire-resistant material, and the surface layer, intermediate layer, and inner layer may contain a heat-absorbing agent in their resin compositions.

[0022] As an example, a single-layer structure can be used, which is made of a resin composition containing 1 to 20 parts by weight of thermally expandable graphite per 100 parts by weight of polyvinyl chloride resin. Alternatively, a three-layer structure can be used, which is made of a thermally expandable fire-resistant layer made of a resin composition containing 1 to 20 parts by weight of thermally expandable graphite per 100 parts by weight of polyvinyl chloride resin, and coating layers of a polyvinyl chloride resin composition that does not contain thermally expandable graphite that cover the inner and outer surfaces of the thermally expandable fire-resistant layer.

[0023] That is, if the amount of thermally expandable graphite is less than 1 part by weight, sufficient thermal expansion may not be obtained during combustion, and the desired fire resistance may not be obtained.If the amount of thermally expandable graphite is more than 20 parts by weight, the graphite may expand too much upon heating, and may not be able to maintain its shape, causing residue to fall out of the through holes H, resulting in a decrease in fire resistance.

[0024] When the intermediate pipe 15 has a multi-layer structure, the resin composition containing the thermally expandable fire-resistant material is not particularly limited, but preferably contains 1 to 20 parts by weight of thermally expandable graphite per 100 parts by weight of polyvinyl chloride resin. The content of the thermally expandable graphite is more preferably 4 to 18 parts by weight, and even more preferably 6 to 16 parts by weight. That is, if the amount of thermally expandable graphite is less than 1 part by weight, sufficient thermal expansion may not be obtained during combustion, and the desired fire resistance may not be obtained. If the amount of thermally expandable graphite is more than 20 parts by weight, excessive thermal expansion may occur when heated, or the resin component may be insufficient, causing the residue to become brittle and unable to maintain its shape, causing the residue to fall off from the through holes H, and reducing fire resistance. In the present invention, as described below, the height of the intermediate tube 15 (the length in the thickness direction of the slab) is set to be smaller than the thickness of a typical slab, so that even if the content of thermally expandable graphite is relatively high, for example, 8 parts by weight or more, and the residue is brittle, the residue after thermal expansion can be retained within the slab and is less likely to fall off. Furthermore, if the thermally expandable graphite content is relatively high, for example, 8 parts by weight or more, the compressive strength of the intermediate pipe 15 decreases, and the compression ratio measured based on the flattening test specified in JIS K 6741:2016 becomes 50% or less. Here, when the vertical pipe P1 or horizontal pipe P3 thermally expands or contracts, or when physical forces are applied during construction, stress concentrates at the contact points between the collective joint 10 and the upper and lower surfaces of the mortar M. Therefore, if stress is transmitted to the intermediate pipe 15, which has low compressive strength, it is prone to breakage. However, by setting the height of the intermediate pipe 15 to 150 mm or less, in other words, a height smaller than the thickness of a typical slab, stress is less likely to be transmitted to the intermediate pipe 15, making it less likely to break.

[0025] Examples of the polyvinyl chloride resin include polyvinyl chloride homopolymers; copolymers of vinyl chloride monomers and monomers having unsaturated bonds copolymerizable with the vinyl chloride monomers; and graft copolymers in which vinyl chloride is graft-copolymerized onto (co)polymers other than vinyl chloride. These may be used alone or in combination of two or more. If necessary, the polyvinyl chloride resin may be chlorinated.

[0026] The intermediate layer containing thermally expandable graphite is black, so it is preferable that the surface layer and the inner layer contain a colorant other than black so that they can be distinguished from the intermediate layer. The thickness of the surface layer and the inner layer is preferably 0.3 mm to 3.0 mm, and more preferably 0.6 mm to 1.5 mm. If the thickness of the coating layer is 0.3 mm or more, the mechanical strength of the pipe can be sufficiently ensured, and if it is 3.0 mm or less, a decrease in fire resistance can be suppressed. Furthermore, it is preferable that the intermediate tube 15 meets the performance requirements set forth in JIS K6741.

[0027] The thermally expandable graphite used in this embodiment can be, for example, a crystalline compound obtained by acid treating powder of natural scaly graphite, pyrolytic graphite, kish graphite, or the like with an inorganic acid and a strong oxidizing agent to insert the inorganic acid between the layers of the graphite, and then adjusting the pH. As the inorganic acid, concentrated sulfuric acid, nitric acid, selenic acid, etc. can be used. As the strong oxidizing agent, concentrated nitric acid, perchloric acid, perchlorates, permanganates, dichromates, hydrogen peroxide, etc. can be used.

[0028] By adjusting the pH, it is possible to use thermally expandable graphite which is a crystalline compound that maintains the layered structure of carbon and has a pH adjusted to 1.5 to 4.0, and thermally expandable graphite with a 1.3-fold expansion temperature of 180°C to 270°C.

[0029] If the pH of the thermally expandable graphite is less than 1.5, it will be too acidic and may easily cause corrosion of the molding equipment, while if the pH exceeds 4.0, the effect of promoting the carbonization of the polyvinyl chloride resin will be weakened, and sufficient fire resistance may not be achieved. The particle size of the thermally expandable graphite is not particularly limited, but for example, the range of 100 to 400 μm, preferably the range of 120 to 350 μm, can be used.

[0030] The resin composition constituting the intermediate tube 15 may contain additives such as stabilizers, inorganic fillers, flame retardants, lubricants, processing aids, impact modifiers, heat resistance improvers, antioxidants, light stabilizers, UV absorbers, pigments, plasticizers, and thermoplastic elastomers as needed, provided that the purpose of this embodiment is not impaired.

[0031] The height of the intermediate pipe 15 is preferably 10 mm to 150 mm, more preferably 20 mm to 100 mm, and most preferably 20 mm to 80 mm. If the height of the intermediate pipe 15 is less than 10 mm, it is difficult to ensure sufficient joint strength when joining the upper joint 11 and the lower joint 12, and the volume required to block the pipe line when heated and expanded is insufficient. If the height of the intermediate pipe 15 exceeds 150 mm, the upper or lower end of the intermediate pipe 15 will protrude above or below the floor slab S if the floor slab S is thin, making it difficult to position the horizontal pipe P3 near the floor. If the lower end of the intermediate pipe 15 is located below the through hole H, the pipe will expand significantly below the through hole H during expansion, increasing the risk of it falling out of the through hole H. If the height of the intermediate pipe 15 is in the range of 10 mm to 150 mm, the typical floor slab thickness is 150 to 300 mm, and if applied to floor slabs of any thickness, the height will be such that the purpose of blocking the pipeline due to thermal expansion when heated by a fire, etc. can be achieved. Furthermore, if the height is in this range, the joint strength can be ensured for floor slabs of a typical thickness, and the height will be such that the intermediate pipe 15 can be accommodated in the through hole H. However, the height of the intermediate pipe 15 may be less than 10 mm or greater than 150 mm.

[0032] The inner diameter of the intermediate pipe 15 is preferably larger than the inner diameter of the vertical pipe P1, more preferably 100 mm to 200 mm, even more preferably 110 mm to 175 mm, and most preferably 120 mm to 150 mm. As described above, when the height of the intermediate pipe 15 is 150 mm or less, the internal volume of the intermediate pipe 15 is small. Therefore, when the inner diameter of the intermediate pipe 15 is smaller than the inner diameter of the standpipe P1, the intermediate pipe 15 is likely to be clogged by the wastewater flowing down from the standpipe P1, and excessive positive pressure is likely to occur. On the other hand, if the inner diameter of the intermediate pipe 15 is greater than 200 mm, the inner diameter of the through hole H into which the collective joint 10 is inserted must be made larger, making it difficult to fill with the filler M and reducing workability. However, the inner diameter of the intermediate pipe 15 may be less than 100 mm or greater than 200 mm. Furthermore, the inner diameter of the intermediate pipe 15 may be equal to or smaller than the inner diameter of the vertical pipe P1.

[0033] The joint lower part 12 is made of a pipe body whose diameter is smaller below than above. The joint lower part 12 is arranged below the joint upper part 11. The joint lower part 12 is equipped with a connecting pipe part 16 located at its upper end and connected to the lower end of the intermediate pipe 15, an inclined pipe part 17 that tapers downward and is connected below the connecting pipe part 16, and a lower standpipe receptacle 18 (lower standpipe receptacle, lower standpipe connecting receptacle) that is connected to the lower end of the inclined pipe part 17 and to which the second standpipe P2 is connected. The connecting pipe part 16, inclined pipe part 17, and lower standpipe receptacle 18 are integrally formed by, for example, injection molding of a synthetic resin material.

[0034] The inner diameter of the connecting pipe portion 16 is larger than the outer diameter of the intermediate pipe 15. The lower portion of the peripheral wall of the intermediate pipe 15 is fitted inside the connecting pipe portion 16. The outer diameter of the upper end of the inclined pipe portion 17 is smaller than the outer diameter of the connecting pipe portion 16. Therefore, a peripheral step 16a is formed at the boundary between the lower end of the connecting pipe portion 16 and the upper end of the inclined pipe portion 17. The outer diameter of the lower end of the inclined pipe section 17 is smaller than the outer diameter of the upper end of the inclined pipe section 17. Second swirl vanes 26 are provided on the inner circumferential surface of the vertically middle part of the inclined pipe section 17. The second swirl vanes 26 are formed, for example, so as to protrude from the outside to the inside of the inclined pipe section 17. The second swirl vanes 26 change the flow of wastewater flowing inside the joint lower section 12 and cause it to swirl.

[0035] The outer diameter of the lower riser pipe receiving port 18 is smaller than the outer diameter of the connecting pipe section 16 and larger than the outer diameter of the lower end of the inclined pipe section 17. The size of the lower riser pipe receiving port 18 in the direction of the central axis O is smaller than the size of the connecting pipe section 16 in the direction of the central axis O. The second riser pipe P2 of the lower floor is fitted from below into the inside of the lower riser pipe receiving port 18, thereby connecting the second riser pipe P2 below the floor slab S to the joint lower part 12. In the example shown, the lower riser pipe receiving port 18 is a receiving port for the second riser pipe P2, but the lower riser pipe receiving port 18 may also be a spigot for the second riser pipe P2.

[0036] The upper joint 11 and the lower joint 12 may be made transparent, which allows the connection state of the upper joint 11 and the lower joint 12 to be visually confirmed from the outside. The upper joint 11 and the lower joint 12 may also be blended with a flame retardant such as non-thermally expandable graphite, magnesium hydroxide, or aluminum hydroxide.

[0037] An upper riser socket 19 (upper riser socket, upper riser connection socket) is provided at the upper end of the joint upper part 11 (upper end of the riser connection part 13) to which the first riser P1 is connected. The upper riser socket 19 is connected to the first riser P1 which is above the floor slab S. The upper riser socket 19 includes a vertical bushing 21, a vertical packing 22, and a vertical ring 23. The vertical bushing 21 includes a fitting portion 21a, a first swirl vane 25, and a swirl vane support leg portion 21c. The fitting portion 21a has a smaller diameter than the upper end portion of the vertical bushing 21 and is cylindrical so as to fit into the riser pipe connecting portion 13 of the upper joint portion 11.

[0038] The first swirl vane 25 deflects and swirls the wastewater. The first swirl vane 25 is supported by the swirl vane support leg 21c so that the projected area of ​​the first swirl vane 25 as viewed in the pipe axial direction is 5% to 30% of the internal cross-sectional area of ​​the first standpipe P1 and the inclination angle is 20° to 50°. However, the projected area and the inclination angle may be outside the above-mentioned ranges. The swirl vane support leg 21c extends from the lower end of the fitting portion 21a with a width substantially equal to the horizontal width of the first swirl vane 25, and its lower edge is inclined to follow the inclination of the first swirl vane 25. The swirl vane support surface of the swirl vane support leg 21c is formed in an arc-shaped cross section and supports the first swirl vane 25 slightly above the lower edge. However, the position where swirl vane support leg 21c supports first swirl vane 25 is not limited, and may be, for example, the lower edge. The first swirl vane 25 is applied when high drainage performance is required depending on the size of the building and the number of drainage fixtures, so it may be omitted in buildings where high drainage performance is not required.

[0039] The vertical packing 22 is a packing made of a rubber material typically used in drainage equipment, such as ethylene-propylene-diene rubber (EPDM). The vertical packing 22 has a lip portion 22a at its upper end that is in watertight contact with the outer circumferential surface of the first vertical pipe P1, and is fitted into the vertical bushing 21 so that its upper end surface is substantially flush with the upper end surface of the vertical bushing 21. Furthermore, as shown in FIG. 2, the lip portion 22a is provided so that its diameter gradually decreases toward its lower end when the first standpipe P1 is not inserted. The upper end of the lip portion 22a has a diameter that is approximately the same as or slightly larger than the outer diameter of the first standpipe P1, and the lower end has a diameter that is smaller than the outer diameter of the first standpipe P1. A step 22b that protrudes radially inward is formed at the lower end of the lip portion 22a. The pipe end of the first standpipe P1 abuts against this step 22b, which absorbs thermal expansion and contraction of the first standpipe P1.

[0040] The vertical ring 23 is fitted onto the upper end of the vertical bush 21 and prevents the vertical packing 22 from coming off the vertical bush 21 by a flange portion 23a provided at one end. The vertical bush 21 to the vertical ring 23 can be assembled and integrated in advance, and then the fitting portion 21a of the vertical bush 21 can be fitted into the riser pipe connecting portion 13 of the joint upper portion 11 and bonded.

[0041] A horizontal bushing 31, a horizontal packing 32, and a horizontal ring 33 are provided at the tip of the horizontal pipe connection port 14 to which the horizontal pipe P3 is connected. One end of the horizontal bushing 31 is fitted and bonded to the horizontal pipe connection port 14 of the joint upper part 11, and the other end is expanded in diameter.

[0042] The horizontal packing 32 is made of a rubber material typically used in drainage equipment, such as ethylene-propylene-diene rubber (EPDM). The horizontal packing 32 is fitted onto the enlarged other end of the horizontal bushing 31, and is tightly fitted to the outer circumferential surface of the horizontal pipe P3 in a watertight manner.

[0043] The horizontal ring 33 is fitted onto the expanded diameter portion of the horizontal bush 31, and a flange portion 33a provided at one end prevents the horizontal packing 32 from coming off the vertical ring 23. In addition, the vertical bushing 21, vertical ring 23, horizontal bushing 31, and horizontal ring 33 are all obtained by injection molding a polyvinyl chloride resin composition containing 0.1 to 1.0 parts by weight of non-expandable graphite per 100 parts by weight of polyvinyl chloride resin.

[0044] In this embodiment, the standpipe P1 is connected to the upper standpipe receptacle 19 via a junction joint 42. A plurality of siphon drain pipes P4 are also connected to the junction joint 42. The junction joint 42 joins the drainage water from the standpipe P1 with the drainage water from the plurality of siphon drain pipes P4. The junction joint 42 has a junction section 43 that joins the drainage water from the standpipe P1 and the plurality of siphon drain pipes P4, and a lower end tubular section 44 that is provided downstream of the junction section 43 and connected to the upper standpipe receptacle 19. For example, the configuration described in JP 2020-94612 A may be adopted as the junction joint 42.

[0045] In this embodiment, the collective joint 10 is provided with a plurality of protrusions 20. The plurality of protrusions 20 are provided to protrude from the inner surface of one or both of the joint upper part 11 and the joint lower part 12. The protrusions 20 are, for example, blades (which swirl the wastewater), deflection plates (which deflect the wastewater), deflection protrusions (which deflect the wastewater), etc. The protrusions 20 change, deflect, or rectify the flow of the wastewater flowing from the upstream side relative to the protrusions 20, thereby contributing to improving the drainage capacity. In this embodiment, the plurality of swirl vanes 25, 26 described above are provided as the plurality of protrusions 20.

[0046] The first swirl vane 25 and the second swirl vane 26 are each one of the multiple protrusions 20 in this embodiment. Both the first swirl vane 25 and the second swirl vane 26 are located downstream of the upper standpipe inlet 19 to which the siphon drain pipe P4 is connected. The lower ends of the first swirl vane 25 and the second swirl vane 26 are both located downstream of the horizontal pipe connection port 14. The entire second swirl vane 26 is located downstream of the horizontal pipe connection port 14. In this manner, at least one of the multiple protrusions 20 is located downstream of the horizontal pipe connection port 14. The protrusion width of the first swirl vane 25 from the inner wall surface of the upper joint 11 and the protrusion width of the second swirl vane 26 from the inner wall surface of the lower joint 12 may be 15 mm or more.

[0047] The upper joint 11, the lower joint 12, and the multiple protrusions 20 are all made of resin. In this embodiment, the upper joint 11 and the lower joint 12 are formed as separate members and then combined into an integrated unit. The protrusions 20 may be formed integrally with the upper joint 11 or the lower joint 12, or may be formed separately. In this embodiment, the first swirl vane 25 and the upper joint 11 are formed separately, and the second swirl vane 26 and the lower joint 12 are formed integrally.

[0048] "Installation of a collective joint" The above-described joint 10 is used at the junction of horizontal branch pipes on each floor of a drainage riser of a multi-story building, as shown in FIG. 1, and is installed as follows. That is, the portion including the fitted connection portion of the lower joint 12, intermediate pipe 15, and upper joint 11 is installed facing the through-hole H in the floor slab S, and a second standpipe P2 on the lower floor (for example, a commercially available Eslon (registered trademark) fire-resistant VP pipe manufactured by Sekisui Chemical Co., Ltd. can be used) is fitted into and bonded to the lower standpipe socket 18 of the lower joint 12. During this installation, the upper end of the lower joint 12 and the lower ends of the intermediate pipe 15 and upper joint 11 are housed inside the through-hole H. In addition, the lower end of the first vertical pipe P1 on the upper floor is fitted to the vertical packing 22 via the vertical ring 23 and the junction joint 42. A plurality of siphon drain pipes P4 are also connected to the junction joint 42.

[0049] Next, the through holes H in the floor slab S are filled with a filler (sound-proofing material) M such as mortar or rock wool, and the upper end of the lower joint 12, the intermediate pipe 15, and the portion including the lower end of the upper joint 11 are embedded in the filler M. The upper end of the inclined pipe portion 17 and the connecting pipe portion 16 of the lower joint 12 are embedded in the filler M. The portion of the upper joint 11 below the lower end of the horizontal pipe connection port 14 (lower end 9) is embedded in the filler M. It is preferable to use mortar, which has excellent residue retention properties, as the filler M. Then, the end of the horizontal pipe P3 is inserted into the horizontal bushing 31 via the horizontal ring 33 and the horizontal packing 32 to connect the horizontal pipe P3.

[0050] The collective joint 10 of this embodiment has the installation structure described above, in which the intermediate pipe 15 is buried inside the through-hole H of the floor slab S while being surrounded by filler material M. In addition, the lower end 9 of the joint upper part 11 located outside the intermediate pipe 15, the upper end of the inclined pipe part 17, and the connecting pipe part 16 are also buried inside the through-hole H of the floor slab S while being surrounded by filler material M. With this structure, if a fire breaks out on the floor below and the through-hole H and its surrounding area are heated by the flames, the thermally expandable graphite contained in the intermediate pipe 15 will expand. The expanded intermediate pipe 15 will then block the lower end of the upper joint 11 or the upper end of the lower joint 12. This will prevent flames and smoke from flowing from the floor below to the floor above, thereby preventing the spread of fire.

[0051] In addition, assuming that the lower joint part 12 will melt down due to the heat during a fire, even if the lower joint part 12 melts down, the intermediate pipe 15 will expand and close the through hole H, thereby exerting a fire spread prevention effect. Therefore, the through hole H can be reliably closed in the event of a fire, and a fire spread prevention effect is exerted.

[0052] With a structure equipped with the collective joint 10 shown in Fig. 1, an intermediate pipe 15 having a height of 30 mm or more and 150 mm or less can be reliably placed in the through-hole H, regardless of the thickness of the floor slab S, which may be any thickness between 150 and 300 mm. Therefore, the structure shown in Fig. 1 can be applied to floor slabs S of any thickness. For this reason, the structure of this embodiment can be widely applied to any building with a general slab thickness, and is highly versatile.

[0053] 1, the inclined pipe section 17 that tapers downward is provided below the connecting pipe section 16, and as a result, this inclined pipe section 17 is securely held by the filler M, and as a result, even if heated by a flame or the like, the connecting pipe section 16 can be reliably prevented from falling. However, the inclined pipe section 17 does not have to be provided. 1, the connecting pipe portion 16 has a peripheral step 16a at its lower end, so that when the intermediate pipe 15 expands during a fire, the peripheral step 16a reliably catches on the filler material M. This prevents the lower joint portion 12 from burning through and falling, and the expansion of the intermediate pipe 15 reliably closes the through hole H, ensuring fire resistance. However, the peripheral step 16a does not have to be provided.

[0054] According to the above-described collecting joint 10 and drainage system 1, the collecting joint 10 is provided with a first swirl vane 25 and a second swirl vane 26. These multiple protrusions 20 are located downstream of the upper standpipe inlet 19 to which the siphon drain pipe P4 is connected. Therefore, even if a large amount of high-pressure wastewater concentrates from the multiple siphon drain pipes P4 and flows into the collecting joint 10, the first swirl vane 25 and the second swirl vane 26 can deflect the flowing wastewater, making it easier to form an air flow path (air core) in the wastewater flow, for example. This ensures drainage performance even when multiple siphon drain pipes P4 are connected to the standpipe P1.

[0055] The first swirl vane 25 is provided at the upper joint 11, and the second swirl vane 26 is provided at the lower joint 12. Therefore, the wastewater flowing down the collecting joint 10 can be divided into multiple flows and deflected, which makes it easier to relieve internal positive pressure, for example.

[0056] The second swirl vane 26 of the protrusion 20 is located downstream of the horizontal pipe connection port 14. In this way, the second swirl vane 26 can cause the wastewater flowing into the collecting joint 10 to swirl downstream of the position where all the wastewater flows into the collecting joint 10 join together.

[0057] Furthermore, the lower end of the first swirl vane 25 of the protrusion 20 is also located downstream of the horizontal pipe connection port 14. Therefore, the lower end of the first swirl vane 25 can be located downstream of the position where all the wastewater flowing into the collecting joint 10 joins together.

[0058] [First Modification of the First Embodiment] 2 shows a first modified example of the first embodiment. As shown in FIG. 2, the collective joint 10A of the first modified example includes a deflector plate 27 as a protrusion 20 having a substantially triangular shape. The deflector plate 27 is disposed downstream of the upper riser receptacle 19 to which the siphon drain pipe P4 is connected, and is disposed upstream of the first swirl vane 25 and the horizontal pipe connection port 14.

[0059] The deflector plate 27 protrudes inward from the inner wall surface of the upper joint 11. When viewed from the side in the circumferential direction along the inner wall surface, the deflector plate 27 has a roughly right-angled triangular shape, and its width from the inner wall surface increases toward the downstream side. The protrusion width of the deflector plate 27 from the inner wall surface of the upper joint 11 is 15 mm or more. The protrusion width may be less than 15 mm or may be greater than 15 mm, but a protrusion width greater than 15 mm is preferable to prevent water sealing due to large amounts of drainage. The surface of deflector plate 27 may be a flat surface along the direction of central axis O, or may be a flat surface or a curved surface inclined relative to the direction of central axis O. When inclined relative to the direction of central axis O, it may be inclined in the same direction as first swirl vanes 25. The rest is the same as in the first embodiment.

[0060] Even with this first modified example, the same effects as those of the first embodiment can be obtained. In particular, this first modified example includes a deflection plate 27, and the protrusion width of the deflection plate 27 from the inner wall surface is 15 mm or more. Therefore, the first standpipe P1 and the multiple siphon drain pipes P4 join together, and the flow of wastewater flowing down is likely to cause drift. For example, it is possible to create a slit in the water film of the cylindrical wastewater flow flowing down along the inner circumferential surface of the first standpipe P1, thereby creating a divided portion in the water film.

[0061] [Second Modification of the First Embodiment] Fig. 3 shows a second modified example of the first embodiment. As shown in Fig. 3, in the collective joint 10B of the second modified example, the upper standpipe socket 19 is connected to the upper end of the standpipe connection portion 13 via a socket 19a (joint). The rest is the same as in the first embodiment. Even with this structure, the same effects as those of the first embodiment can be obtained.

[0062] [Second embodiment] Next, a group joint according to a second embodiment of the present invention will be described with reference to FIG. FIG. 4 shows a part of a drainage system using the cluster joint of the second embodiment. In the second embodiment, the same components as those in the first embodiment are denoted by the same reference numerals, and the description thereof will be omitted, with only the differences being described.

[0063] In the collecting joint 10C of the second embodiment, multiple siphon drain pipes P4 from the upper floor are connected to a horizontal pipe connection port 14 on the side of the upper joint 11 of the collecting joint 10C via a junction joint 42. A large amount of powerful drainage water from the multiple siphon drain pipes P4 merges into the vertical pipe P1 from the horizontal pipe connection port 14. For example, the configuration described in JP 2017-89369 A may be used as the junction joint 42.

[0064] In this collective joint 10C, the swirl vane support leg 21c is longer in the direction of the central axis O than in the first embodiment. Therefore, the first swirl vane 25 serving as the protrusion 20 is positioned lower in the direction of the central axis O than in the first embodiment. As a result, the first swirl vane 25 in the second embodiment is positioned downstream (below) of the horizontal pipe connection port 14 to which the siphon drain pipe P4 is connected. The rest of the configuration is the same as that of the first embodiment.

[0065] Even with the mass joint 10C and the drainage system 1 of the second embodiment, the same effects as those of the first embodiment can be obtained. In particular, in the second embodiment, a large amount of wastewater with strong force from multiple siphon drain pipes P4 merges with the wastewater in the standpipe P1 through the horizontal pipe connection port 14, which is a configuration different from the first embodiment. However, the first swirl vane 25 and the second swirl vane 26 are located downstream of the horizontal pipe connection port 14 to which the siphon drain pipes P4 are connected. Therefore, the first swirl vane 25 and the second swirl vane 26 can deflect the wastewater that merges and flows downward, making it easy to form an air flow path (air core) inside, for example. As a result, drainage performance can be ensured even when multiple siphon drain pipes P4 are connected to the standpipe P1.

[0066] [Third embodiment] Next, a group joint according to a third embodiment of the present invention will be described with reference to FIG. 5 shows a part of a drainage system using the collective joint of the third embodiment. This drainage system is an example of a drainage system provided on the lowest floor. In the third embodiment, the same components as those in the first embodiment are denoted by the same reference numerals, and the description thereof will be omitted, with only the differences being described.

[0067] The collective joint 10D of the third embodiment is a collective joint for the so-called lowest floor (the collective joints 10, 10A, 10B, and 10C of the first and second embodiments are collective joints for normal floors). In the first embodiment, the upper joint part 11 and the lower joint part 12 are formed separately, whereas in this embodiment, the upper joint part 11 and the lower joint part 12 are formed integrally. The upper joint part 11 is provided with a riser pipe connection part 13, an upper riser pipe receptacle 19, and a plurality of horizontal pipe connection ports 14. The lower joint part 12 is provided with a lower riser pipe receptacle 18. The riser pipe connection part 13 and the lower riser pipe receptacle 18 have the same diameter. As in the first embodiment, the lower cylindrical end portion 44 of the junction joint 42 is connected to the upper riser socket 19, and horizontal pipes P3 are connected to the multiple horizontal pipe connection ports 14. A second riser P2 for discharging to the outside is connected to the lower riser socket 18. The riser P2 is bonded to the lower riser socket 18 in advance to form a collecting joint 10D.

[0068] The upper standpipe receiving port 19 has a structure that uses drift projections 28 as the projections 20, and does not have the first swirl vanes 25 of the first embodiment inside. The following description will focus on this difference. In this embodiment, the vertical bushing 21 includes an inner peripheral flange 40, an extension piece 40A, and a drifting projection 28 in addition to the fitting portion 21a. The inner flange 40 is formed in an inward ring shape on the lower end side of the fitting portion 21a. The extension piece 40A extends a predetermined length in the pipe axial direction from the inner peripheral edge of the inner flange 40. A drift projection 28 serving as a projection 20 is formed on the inner peripheral surface of the extension piece 40A.

[0069] In this embodiment, six flow drifting protrusions 28 are formed at regular intervals in the inner circumferential direction of the inner flange 40. That is, in this example, six flow drifting protrusions 28 are formed at 60° intervals in the inner circumferential direction of the inner flange 40. It is preferable that the flow drifting protrusions 28 are formed evenly at equal intervals in the circumferential direction of the inner flange 40. As shown in Figure 5 as an example, the drift protrusion 28 is formed in a rectangular shape in a plan view when the opening of the vertical bush 21 is viewed from the direction of its central axis O, and in an isosceles triangular shape in a side view when the inner surface of the vertical bush 21 is viewed from the axial side of the vertical bush 21 so that the drift protrusion 28 is positioned directly in front. The flow drifting projection 28 of this embodiment is formed in the shape of an isosceles triangle in side view, having a bottom surface 41a and two inclined surfaces 41b, 41b. A rounded portion 41c is formed at the apex where the two inclined surfaces 41b, 41b intersect. This rounded portion 41c is defined by an inclined surface at the apex where the two inclined surfaces 41b intersect, with the curvature gradually increasing from the base end side of the flow drifting projection 28 to the tip end side of the flow drifting projection 28.

[0070] In the structure of this embodiment, when the nominal diameter of the first standpipe P1 is a general-purpose size for buildings of about 60 to 180, the height (h) of the drifting protrusions 28 can be selected in the range of 5 to 15 mm, and the width (W) of the drifting protrusions 28 can be selected in the range of 8 to 21 mm. It is more preferable that the height (h) of the drifting protrusions 28 is about 10 to 15 mm. The height (h) of the flow drifting protrusion 28 refers to the height (mm) of the flow drifting protrusion 28 when viewed from the side from the center of the inner flange 40, or in other words, the length of the flow drifting protrusion 28 along a direction parallel to the central axis O of the standpipe connecting part 13. The width (W) of the flow drifting protrusion 28 refers to the width (length: mm) of the flow drifting protrusion 28 along the circumferential direction of the inner flange 40.

[0071] The height of the drifting protrusions 28 needs to be a certain height in order to create a slit in the water film, but it is desirable to set it as small as possible within the range in which the slit can be created. The width of the drifting protrusions 28 needs to be a certain width in order to create a slit in the water film. There is no problem as long as it is within the above-mentioned range. If the size of the drifting protrusions 28 is made larger than necessary, foreign matter may flow along with the wastewater and become caught on the drifting protrusions 28. For this reason, it is preferable to set the height and width of the drifting protrusions 28 within the above-mentioned ranges, and providing the curved portions 41c at the upstream portions of the drifting protrusions 28 can prevent foreign matter from becoming caught.

[0072] The drifting protrusions 28 are provided, for example, to create cuts in the water film of the tubular drainage flow that falls after passing through the inner peripheral edge of the inner peripheral flange 40, thereby creating divided portions in the water film. The height and width of the drifting protrusions 28 are preferably within the above ranges when they are formed in a triangular shape in side view in order to create cuts in the water film of the wastewater flow and generate divided portions. Furthermore, the number of drift protrusions 28 formed on the inner circumference of the inner flange 40 may be any number as long as it is plural, but it is preferable that the number of drift protrusions 28 corresponds to the number of horizontal pipe connection ports 14 and is greater than the number of installed horizontal pipe connection ports 14. In a normal configuration in which the number of installed horizontal pipe connection ports 14 is about 1 to 4, about 4 to 8 drift protrusions can be formed.

[0073] A second swirl vane 26 is provided as a protrusion 20 on the side of the lower joint lower part 12 facing the lower standpipe socket 18. In this embodiment, a lower fitting ring 47 is fitted between the lower standpipe socket 18 and the standpipe P1. The second swirl vane 26 is provided on the inner peripheral surface of this lower fitting ring 47. In this embodiment, the upper joint portion 11 is provided with a plurality of drifting protrusions 28, and the second swirl vanes 26 may not be provided. That is, the plurality of protrusions 20 may be provided in the circumferential direction instead of in the vertical direction.

[0074] The collecting joint 10D of the third embodiment as described above has a plurality of drifting protrusions 28 as protrusions 20, which are located downstream of the upper standpipe inlet 19 to which the siphon drain pipes P4 are connected. Furthermore, a second swirl vane 26 is also provided in the joint lower part 12. Therefore, even if a large amount of fast-moving wastewater concentrates from the plurality of siphon drain pipes P4 and flows into the collecting joint 10D, the plurality of drifting protrusions 28 and the second swirl vane 26 can drift the downstream flowing wastewater. As a result, as in the first embodiment, drainage performance can be ensured even when a plurality of siphon drain pipes P4 are connected to the standpipe P1.

[0075] [Fourth embodiment] Next, a group joint according to a fourth embodiment of the present invention will be described with reference to FIG. 6 shows a part of a drainage system using the collective joint of the fourth embodiment. This drainage system is also a drainage system on the lowest floor, similar to the third embodiment. In the fourth embodiment, the same components as those in the third embodiment are denoted by the same reference numerals, and the description thereof will be omitted, with only the differences being described.

[0076] In the collecting joint 10E of the fourth embodiment, multiple siphon drain pipes P4 from the upper floor are connected to the horizontal pipe connection port 14 of the collecting joint 10 via a merging joint 42. A large amount of powerful drainage water from the multiple siphon drain pipes P4 merges with the drainage water from the vertical pipe P1 from the horizontal pipe connection port 14.

[0077] In this collective joint 10E, a plurality of drifting protrusions 28 serving as protrusions 20 are provided on the inner circumferential surface of the lower fitting ring 47, instead of the second swirl vanes 26. The drifting protrusions 28 may have a configuration similar to that of the drifting protrusions 28 provided on the extension piece 40A in the third embodiment. A plurality of drifting protrusions 28 are provided at positions facing each other in the joint lower part 12. The drifting protrusions 28 may be formed over the entire inner circumferential surface of the lower fitting ring 47, in which case a single ring-shaped drifting protrusion 28 is formed. Alternatively, the drifting protrusions 28 may not be formed on the lower fitting ring 47, but may be formed on the inner circumferential surface of the standpipe P2, or the standpipe P2 may be processed to form the drifting protrusions 28.

[0078] In the collecting joint 10E of the fourth embodiment, a large amount of powerful wastewater from multiple siphon drain pipes P4 merges with the wastewater from the standpipe P1 through the horizontal pipe connection port 14. However, the multiple drifting protrusions 28 of the lower standpipe receiving port 18 are located downstream of the horizontal pipe connection port 14 to which the siphon drain pipe P4 is connected. Therefore, it is possible to merge the wastewater from multiple siphon drain pipes P4 with the wastewater from the standpipe P1, drifting the wastewater flowing downstream. As a result, drainage performance can be ensured even when multiple siphon drain pipes P4 are connected to the standpipe P1.

[0079] The technical scope of the present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the spirit of the present invention.

[0080] For example, in each of the above embodiments, an example was described in which multiple siphon drain pipes P4 were connected to one of the upper riser pipe inlet 19 and multiple horizontal pipe connection ports 14, but wastewater from the siphon drain pipe P4 may also be allowed to flow into multiple ports of the upper riser pipe inlet 19 and multiple horizontal pipe connection ports 14. All of the protrusions 20 may be located above the horizontal pipe connection port 14 .

[0081] The intermediate pipe 15 may be omitted. Instead of the intermediate pipe 15 having fire resistance, a fire-resistant sheet may be wrapped around at least one of the joint upper part 11 and the joint lower part 12. The fire-resistant sheet is made of, for example, the same material as the intermediate pipe 15. That is, the entire structure may be a single layer made of a resin composition containing a heat-expandable fire-resistant material, or a multi-layer structure made of multiple layers including a sound-insulating layer, a sound-absorbing layer, etc. In the case of a multi-layer structure, it is sufficient that any one of the layers is formed from a resin composition containing a heat-expandable fire-resistant material. For example, a portion of the sound-insulating layer or sound-absorbing layer covering the outer periphery of the upper joint 11 or the lower joint 12 may be formed from a resin composition containing a heat-expandable fire-resistant material and function as a fire-resistant layer. Alternatively, the fire-resistant layer may be a multi-layer structure formed by wrapping a single-layer fire-resistant sheet made of a resin composition containing a heat-expandable fire-resistant material. Among these, a structure wrapped with a fire-resistant sheet is preferable because it is easy to implement at the construction site. In addition, if the intermediate pipe 15 does not contain thermally expandable graphite, a sheet-like fire-resistant material containing thermally expandable graphite may be wrapped around the outer surface of the intermediate pipe 15 or the outer surface of the sound-insulating material covering the intermediate pipe 15, and the fire-resistant material may be embedded in the slab penetration portion.

[0082] 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 modifications may be combined as appropriate.

[0083] (Addendum) The embodiment can be understood, for example, as follows.

[0084] <1> A manifold according to one aspect of the present invention is a manifold that is installed in a through hole in a floor slab and to which a siphon drain pipe is connected, the manifold comprising: an upper manifold having an upper riser socket for connecting to a riser pipe above the floor slab; a lower manifold having a lower riser socket for connecting to a riser pipe below the floor slab; and a plurality of protrusions provided on the inner surface of the upper manifold or the lower manifold, the upper manifold having a horizontal pipe connection port on its side, the siphon drain pipe being connected to the upper riser socket or the horizontal pipe connection port, and the protrusions being located downstream of the upper riser socket or the horizontal pipe connection port to which the siphon drain pipe is connected. The protrusions may be vanes, deflector plates, deflector protrusions, or the like.

[0085] According to this manifold, multiple protrusions are provided on the inner surface of the manifold. The protrusions are located downstream of the upper standpipe inlet or horizontal pipe connection port to which the siphon drain pipes are connected. Therefore, even if a large amount of powerful wastewater flows into the manifold from multiple siphon drain pipes, the multiple protrusions can, for example, deflect the flowing wastewater, thereby ensuring drainage performance.

[0086] <2> the above <1> In the collective joint described above, the upper joint, the lower joint, and the protrusion are made of resin, the upper joint and the lower joint are formed of separate members, and the protrusion may be provided inside the upper joint and / or the lower joint.

[0087] <3> the above <1> or <2> In the joint assembly described in 1, at least one of the protrusions may be located downstream of the horizontal pipe connection port. In this way, the protrusion can be provided downstream of the position where all the wastewater flowing into the collecting joint joins together, making it easier to ensure drainage performance.

[0088] <4> the above <1> from <3> In the joint assembly according to any one of the above aspects, a lower end of the protrusion may be located downstream of the horizontal pipe connection port. In this way, the lower end of the protrusion can be located downstream of the position where all the wastewater flowing into the collecting joint joins together, making it easier to ensure drainage performance.

[0089] <5> the above <1> from <4> In the cluster joint according to any one of the above aspects, the projections may have a projection width from the joint inner surface of 15 mm or more.

[0090] <6> the above <1> from <5> In the collective joint according to any one of the above aspects, the protrusions may be provided at opposing positions on the lower part of the joint.

[0091] <7> the above <1> from <6> In the cluster joint according to any one of the above aspects, one of the protrusions may be provided on the upper joint portion, and the other may be provided on the lower joint portion.

[0092] <8> Another aspect of the present invention is a drainage system that is installed in a through hole in a floor slab and is connected to a siphon drain pipe and a manifold joint, wherein the manifold joint comprises an upper joint having an upper riser socket that is connected to a riser pipe above the floor slab, a lower joint having a lower riser socket that is connected to a riser pipe below the floor slab, and a plurality of protrusions provided on the inner surface of the upper joint or the lower joint, wherein the upper joint has a horizontal pipe connection port on its side, the siphon drain pipe is connected to the upper riser socket or the horizontal pipe connection port, and the protrusions are located downstream of the upper riser socket or the horizontal pipe connection port to which the siphon drain pipe is connected.

[0093] In this drainage system, multiple protrusions are provided on the inner surface of the manifold. These protrusions are located downstream of the upper standpipe inlet or horizontal pipe connection port to which the siphon drain pipes are connected. Therefore, even if a large amount of powerful wastewater flows into the manifold from multiple siphon drain pipes, the multiple protrusions can, for example, deflect the flowing wastewater, thereby ensuring drainage performance. [Explanation of symbols]

[0094] 10, 10A, 10B, 10C, 10D, 10E joints 11 Upper joint 12 Lower joint 14 Horizontal pipe connection port 18 Lower standpipe socket 19 Upper standpipe socket 20 Protrusion 25 First swirl blade 26 Second swirl blade 27 Straight plate 28 Variation protrusion 42 Confluence joint H through hole M Soundproofing material (mortar) P1, P2 standpipe P3 horizontal pipe P4 Siphon drain pipe S floor slab

Claims

1. A collective joint that is installed in a through hole in a floor slab and to which a siphon drain pipe is connected, The group joint is an upper joint provided with an upper riser socket connected to a riser above the floor slab; a joint lower portion provided with a lower standpipe socket connected to a standpipe located below the floor slab; a plurality of protrusions provided on the inner surface of the joint upper portion or the joint lower portion; Equipped with The upper part of the joint has a horizontal pipe connection port on the side surface, The siphon drain pipe is connected to the upper riser socket or the horizontal pipe connection port, The protrusion is located downstream of the upper standpipe inlet or the horizontal pipe connection port to which the siphon drain pipe is connected. Collective joint.

2. the joint upper portion, the joint lower portion, and the protrusion portion are made of resin, The upper joint and the lower joint are formed of separate members, The protrusion is provided inside the upper joint and / or the lower joint. The assembly joint according to claim 1 .

3. At least one of the protrusions is located downstream of the horizontal pipe connection port. The assembly joint according to claim 1 .

4. The lower end of the protrusion is located downstream of the horizontal pipe connection port. The assembly joint according to claim 1 .

5. The protruding width of the protrusion from the inner surface of the joint is 15 mm or more. The assembly joint according to claim 1 .

6. The protrusions are provided in plural at positions facing each other in the joint lower portion. The assembly joint according to claim 1 .

7. One of the protrusions is provided on the upper part of the joint, The other is provided at the lower part of the joint. The assembly joint according to claim 1 .

8. A drainage system installed in a through hole in a floor slab and connected to a siphon drain pipe and a collecting joint, The group joint is an upper joint provided with an upper riser socket connected to a riser above the floor slab; a joint lower portion provided with a lower standpipe socket connected to a standpipe located below the floor slab; a plurality of protrusions provided on the inner surface of the joint upper portion or the joint lower portion; Equipped with The upper part of the joint has a horizontal pipe connection port on the side surface, The siphon drain pipe is connected to the upper riser socket or the horizontal pipe connection port, The protrusion is located downstream of the upper standpipe inlet or the horizontal pipe connection port to which the siphon drain pipe is connected. Drainage system.

Images