Cluster joint

Abstract

Suppresses noise caused by drainage. [Solution] The manifold joint 10 comprises an upper connecting pipe 11, a lower connecting pipe 12 arranged below the upper connecting pipe 11, a blade member 21b arranged between the upper connecting pipe 11 and the lower connecting pipe 12 and positioned in the slab penetration hole H, and a support member 24 fixed to at least one of the upper connecting pipe 11 and the lower connecting pipe 12 and supporting the entire length of the outer end of the blade member 21b, which is the end facing radially outward.

Description

[Technical Field]

[0001] The present invention relates to a mass joint. [Background technology]

[0002] In order to improve the drainage performance of a collective joint, a configuration having a blade member inside is known (see, for example, Patent Documents 1 and 2). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 2019-112869 [Patent Document 2] Japanese Patent Application Laid-Open No. 2011-106157 Summary of the Invention [Problem to be solved by the invention]

[0004] The conventional manifold joints described above have a problem in that when wastewater collides with the blade members, the blade members vibrate and produce noise.

[0005] The present invention has been made to solve such problems, and has as its object to provide a joint that can suppress the generation of noise caused by drainage. [Means for solving the problem]

[0006] In order to achieve the above-mentioned object, the manifold joint of the present invention comprises an upper connecting pipe, a lower connecting pipe arranged below the upper connecting pipe, a blade member arranged between the upper connecting pipe and the lower connecting pipe and positioned in the slab penetration hole, and a support member fixed to at least one of the upper connecting pipe and the lower connecting pipe and supporting the entire length of the outer end, which is the end of the blade member facing radially outward. [Effects of the Invention]

[0007] As described above, the present invention has the effect of providing a collective joint that can suppress the generation of noise caused by drainage. [Brief explanation of the drawings]

[0008] [Figure 1] 1 is a longitudinal sectional view of a group joint according to a first embodiment of the present invention. [Figure 2] FIG. 6 is a longitudinal sectional view of a group joint according to a second embodiment of the present invention. [Figure 3] FIG. 10 is a longitudinal sectional view of a group joint according to a third embodiment of the present invention. [Figure 4] FIG. 4 is a perspective view of a support member included in the collective joint shown in FIG. 3. [Figure 5] FIG. 10 is a longitudinal sectional view of a main portion of a group joint according to a modified example of the third embodiment of the present invention. [Figure 6] FIG. 6 is a cross-sectional perspective view of a support member included in the mass joint shown in FIG. 5. [Figure 7] FIG. 6 is a side view of a support member included in the collective joint shown in FIG. 5. [Figure 8] FIG. 10 is a longitudinal sectional view of a group joint according to a fourth embodiment of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0009] (First embodiment) Hereinafter, with reference to FIG. 1, an example of a fire-resistant structure in which a joint according to a first embodiment of the present invention is applied to a through-hole in a slab will be described. The fire-resistant structure 1 of the joint according to this embodiment is used for drainage of a building, and is applied to the portion of a through hole H (slab through hole) formed in a floor slab S. In the embodiment shown in FIG. 1, a first vertical pipe P1 of an upper floor is provided above a through hole H formed in a floor slab S, and a second vertical pipe P2 of a lower floor is provided below the through hole H. As shown in FIG. 1, a fire-resistant structure 1 of a joint according to this embodiment includes a drainage manifold joint (joint, manifold joint) 10.

[0010] The drainage manifold 10 includes an upper connecting pipe 11 and a lower connecting pipe 12 connected to the upper connecting pipe 11 via an intermediate pipe 15. The upper connecting pipe 11 has a vertical pipe connecting portion 13 connectable to a first vertical pipe P1, a horizontal pipe connecting portion 14 protruding from the side of the vertical pipe connecting portion 13 and connectable to a horizontal pipe P3, and a lower end portion 9 inserted into the through hole H. The drainage manifold joint 10 of this embodiment is composed of an upper connecting pipe 11, a lower connecting pipe 12, and an intermediate pipe 15, which are resin joint components.

[0011] In the following description, the upper connecting pipe 11 side of the vertical pipe connecting portion 13 along the central axis O of the vertical pipe connecting portion 13 will be referred to as the upper side, and the lower connecting pipe 12 side will be referred to as the lower side.

[0012] The vertical pipe connection part 13 has a damming plate 13a on its inner surface. The installation angle of the damming plate 13a is -30° to +30° from the vertical direction. If the installation angle is inclined more than 20°, the swirling flow of wastewater swirled by the inclined plate may not be sufficiently blocked, which may cause 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 inside the pipe.

[0013] The horizontal pipe connecting portion 14 extends cylindrically from the peripheral wall of the vertical pipe connecting portion 13 toward the outside in the radial direction perpendicular to the central axis O. In this embodiment, three horizontal pipe connecting portions 14 are arranged in the circumferential direction of the vertical pipe connecting portion 13. Two of the three horizontal pipe connecting portions 14 are individually arranged at positions on either side of the central axis O in the radial direction. The remaining horizontal pipe connecting portions 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 directions in which the two horizontal pipe connecting portions 14 extend. The number and extending direction of the horizontal pipe connecting portions 14 are not limited to the above and can be changed as desired. As shown in Fig. 1, a horizontal pipe (horizontal branch pipe) P3 is connected to the tip side of each horizontal pipe connecting portion 14.

[0014] The upper connecting pipe 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 connecting pipe 11 is obtained, for example, by injecting the polyvinyl chloride resin composition into the cavity of a molding machine.

[0015] An intermediate pipe 15 is connected to the lower end 9 of the upper connecting pipe 11. The outer diameter of the intermediate pipe 15 is smaller than the outer diameter of the vertical pipe connecting portion 13 of the upper connecting pipe 11. The upper part of the peripheral wall of the intermediate pipe 15 is fitted inside the lower end 9 of the vertical pipe connecting portion 13.

[0016] 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.

[0017] 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.

[0018] 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.

[0019] 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.

[0020] 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 content of thermally expandable graphite 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 drainage manifold 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.

[0021] 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.

[0022] 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.

[0023] 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.

[0024] 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.

[0025] 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.

[0026] 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.

[0027] The height of the intermediate pipe 15 is preferably 30 mm to 150 mm, more preferably 30 mm to 100 mm, and most preferably 30 mm to 80 mm. If the height of the intermediate pipe 15 is less than 30 mm, it is difficult to ensure sufficient joint strength when joining the upper connecting pipe 11 and the lower connecting pipe 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 30 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 30 mm or greater than 150 mm.

[0028] 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 vertical pipe P1, the intermediate pipe 15 is likely to be clogged by the wastewater flowing down from the vertical pipe P1, and excessive positive pressure is likely to occur. On the other hand, if the inner diameter of the intermediate pipe 15 is larger than 200 mm, the inner diameter of the through hole H into which the drainage manifold 10 is inserted must be 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.

[0029] The lower connecting pipe 12 is disposed below the upper connecting pipe 11. The lower connecting pipe 12 is made of a pipe body whose diameter is smaller below than above. The lower connecting pipe 12 is provided with a connecting pipe section 16 located at its upper end and connected to the lower end of the intermediate pipe 15, an inclined pipe section 17 that tapers downward and is connected below the connecting pipe section 16, and a lower pipe section 18 that is connected to the lower end of the inclined pipe section 17 and to which the second vertical pipe P2 is connected. The connecting pipe section 16, inclined pipe section 17, and lower pipe section 18 are integrally formed by, for example, injection molding of a synthetic resin material.

[0030] 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. Blades 17w are provided on the inner circumferential surface of the vertically middle part of the inclined pipe section 17. The blades 17w are formed, for example, so as to protrude from the outside to the inside of the inclined pipe section 17. The blades 17w change and swirl the flow of wastewater flowing inside the lower connecting pipe 12. However, the blades 17w are not necessarily required.

[0031] The outer diameter of the lower pipe section 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 pipe section 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 vertical pipe P2 on the lower floor is fitted into the inside of the lower pipe section 18 from below, thereby connecting the second vertical pipe P2 to the lower connecting pipe 12. In the example shown in the figure, the lower pipe section 18 is a socket for the second vertical pipe P2, but the lower pipe section 18 may also be a spigot for the second vertical pipe P2.

[0032] The upper connecting pipe 11 and the lower connecting pipe 12 may be made transparent, which allows the connection state of the upper connecting pipe 11 and the lower connecting pipe 12 to be visually confirmed from the outside. The upper connecting pipe 11 and the lower connecting pipe 12 may also be compounded with a flame retardant such as non-thermal expandable graphite, magnesium hydroxide, or aluminum hydroxide.

[0033] A vertical bush 21, a vertical packing 22, and a vertical ring 23 are provided at the upper end of the upper connecting pipe 11 to which the first vertical pipe P1 is connected. The vertical bushing 21 includes a fitting portion 21a, a swirl vane 21b (vane member), and a swirl vane support leg 21c (support portion). The fitting portion 21a has a smaller diameter than the upper end of the vertical bushing 21 and is cylindrical so as to fit into the vertical pipe connecting portion 13 of the upper connecting pipe 11.

[0034] The swirl vanes 21b are supported by the swirl vane support legs 21c so that the projected area of ​​the swirl vanes 21b in the pipe axial direction is 5% to 30% of the internal cross-sectional area of ​​the first vertical pipe 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 legs 21c extend from the lower end of the fitting portion 21a with a width substantially equal to the horizontal width of the swirl vanes 21b, and the lower edge is inclined to follow the inclination of the swirl vanes 21b. The swirl vane support surface of the swirl vane support legs 21c is formed in an arc-shaped cross section and supports the swirl vanes 21b slightly above the lower edge. However, the position where the swirl vane support legs 21c support the swirl vanes 21b is not limited, and may be, for example, the lower edge. The swirl vane 21b 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.

[0035] Here, in this embodiment, swirl vane 21b is arranged between upper connecting pipe 11 and lower connecting pipe 12. swirl vane 21b is located in through hole H. In the illustrated example, swirl vane 21b is located between the upper and lower surfaces of floor slab S. The upper end of swirl vane 21b is located at a position equal to the upper surface of floor slab S or lower than the upper surface of floor slab S. The lower end of swirl vane 21b is located at a position equal to the lower surface of floor slab S or higher than the lower surface of floor slab S. swirl vane 21b being located in through hole H may mean, for example, that more than half of swirl vane 21b in the vertical direction is located between the upper and lower surfaces of floor slab S, or that more than 90% of swirl vane 21b in the vertical direction is located between the upper and lower surfaces of floor slab S.

[0036] The fitting portion 21a and the swirl vane support leg portion 21c function as a support member 24 that supports the swirl vane 21b. The support member 24 is fixed to at least one of the upper connecting pipe 11 and the lower connecting pipe 12. In this embodiment, the fitting portion 21a is fitted into the upper connecting pipe 11, and the support member 24 is fixed to the upper connecting pipe 11. It is preferable that the fitting portion 21a is fitted into at least one of the upper connecting pipe 11 and the lower connecting pipe 12; for example, it may be fitted into the lower connecting pipe 12, or it may be fitted into both the upper connecting pipe 11 and the lower connecting pipe 12.

[0037] The support member 24 supports the entire length of the outer end of the swirl vane 21b, which is the end facing radially outward. In this embodiment, the swirl vane support leg 21c supports the swirl vane 21b. The swirl vane support leg 21c extends vertically from the fitting portion 21a, and the outer end of the swirl vane 21b is fixed to the upper or lower end of the swirl vane support leg 21c. In this embodiment, the swirl vane support leg 21c extends downward from the fitting portion 21a, and the outer end of the swirl vane 21b is fixed to the lower end of the swirl vane support leg 21c.

[0038] The vertical packing 22 is made of a rubber material typically used in drainage equipment, such as ethylene-propylene-diene rubber (EPDM). The vertical packing 22 has a lip 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 bush 21 so that its upper end surface is substantially flush with the upper end surface of the vertical bush 21. As shown in Fig. 2, the lip portion 22a is formed so that its diameter gradually decreases toward its lower end when the first vertical pipe 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 vertical pipe P1, and the lower end has a diameter that is smaller than the outer diameter of the first vertical pipe 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 vertical pipe P1 abuts against this step 22b, which absorbs thermal expansion and contraction of the first vertical pipe P1.

[0039] 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 bushing 21 to the vertical ring 23 can be assembled and integrated in advance, and then the fitting portion 21a of the vertical bushing 21 can be fitted into the vertical pipe connecting portion 13 of the upper connecting pipe 11 and bonded.

[0040] A horizontal bushing 31, a horizontal packing 32, and a horizontal ring 33 are provided at the tip of the horizontal pipe connecting portion 14 that connects the horizontal pipe P3. One end of the horizontal bushing 31 is fitted and bonded to the horizontal pipe connecting portion 14 of the upper connecting pipe 11, and the other end is expanded in diameter.

[0041] 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.

[0042] 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.

[0043] In this embodiment, no other blade members other than swirl blades 21b are provided above through-hole H in upper connecting pipe 11. Here, the other blade members may be, for example, members for swirling wastewater flowing down from upstream, or members for straightening wastewater flowing down from upstream. The absence of such other blade members above through-hole H makes it possible to effectively suppress the generation of noise.

[0044] "Installation of drainage manifold joint" The drainage manifold joint 10 as described above is used at the junction of horizontal branch pipes on each floor of the drainage riser of a multi-story building, as shown in FIG. 1, and is installed as follows. That is, the parts including the fitting connections of the lower connecting pipe 12, intermediate pipe 15, and upper connecting pipe 11 are installed facing the through-hole H in the floor slab S, and a second vertical pipe P2 on the lower floor (for example, a commercially available Eslon (registered trademark) fire-resistant VP pipe manufactured by Sekisui Chemical Co., Ltd.) is fitted and glued to the lower pipe part 18 of the lower connecting pipe 12. During this installation, the upper end of the lower connecting pipe 12 and the lower ends of the intermediate pipe 15 and upper connecting pipe 11 are housed inside the through-hole H. Also, the lower end of the first vertical pipe P1 on the upper floor is fitted into the vertical packing 22 via the vertical ring 23.

[0045] Next, the through holes H in the floor slab S are filled with a filler material (sound-proofing material) M such as mortar or rock wool, and the upper end of the lower connecting pipe 12 and the lower end of the intermediate pipe 15 and upper connecting pipe 11 are embedded in the filler material M. The upper end of the inclined pipe section 17 and the connecting pipe section 16 of the lower connecting pipe 12 are embedded in the filler material M. The portion of the upper connecting pipe 11 below the lower end of the horizontal pipe connecting section 14 (lower end 9) is embedded in the filler material M. It is preferable to use mortar as the filler material M, as it has excellent residue retention properties. 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.

[0046] The drainage manifold 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 upper connecting pipe 11, the upper end of the inclined pipe section 17, and the connecting pipe section 16, which are located outside the intermediate pipe 15, 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 connecting pipe 11 or the upper end of the lower connecting pipe 12. This will prevent flames and smoke from flowing from the floor below to the floor above, thereby preventing the spread of fire.

[0047] In addition, assuming that the lower connecting pipe 12 will melt down due to the heat during a fire, even if the lower connecting pipe 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.

[0048] In a structure equipped with the drainage manifold 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 value between 150 and 300 mm. Therefore, the structure shown in Fig. 1 can be applied to floor slabs S of any thickness. Therefore, the structure of this embodiment can be widely applied to any building with a general slab thickness, and is highly versatile.

[0049] 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 is securely caught on the filler material M. This prevents the lower connecting pipe 12 from burning down and falling, and the expansion of the intermediate pipe 15 reliably blocks the through hole H, ensuring fire resistance. However, the peripheral step 16a does not have to be provided.

[0050] As described above, according to the drainage manifold 10 of this embodiment, the swirl vane 21b is located in the through-hole H. Therefore, the sound (vibration) generated when the drainage water hits the swirl vane 21b is absorbed by, for example, the floor slab S, and is less likely to be transmitted to the outside. The support member 24 supports the entire length of the outer end of the swirl vane 21b. Therefore, when wastewater hits the swirl vane 21b, the swirl vane 21b is less likely to vibrate and generate noise. As a result, it is possible to suppress the generation of noise caused by drainage.

[0051] (Second embodiment) Next, a drainage manifold 10A according to a second embodiment of the present invention will be described with reference to FIG. 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.

[0052] In the drainage manifold 10A according to this embodiment, the intermediate pipe 15 also serves as the support member 24. In the illustrated example, the intermediate pipe 15 has a notch 15a. The notch 15a is provided in an upper portion of the intermediate pipe 15. The notch 15a penetrates the intermediate pipe 15 in the radial direction. The notch 15a opens upward. The notch 15a has a rectangular shape in a front view from the inside in the radial direction. The portion of the intermediate pipe 15 excluding the notch 15a functions as the fitting portion 15b. As a result, the fitting portion 15b may have a fire-resistant layer (for example, the heat-expandable fire-resistant layer described above). The fitting portion 15b is fitted to both the upper connecting pipe 11 and the lower connecting pipe 12. The fitting portion 15b connects the upper connecting pipe 11 and the lower connecting pipe 12. However, the fitting portion 15b may be fitted to, for example, only the lower connecting pipe 12, and the upper connecting pipe 11 and the lower connecting pipe 12 may not be connected. Of the periphery of the cutout portion 15a, a swirl vane support leg 15c is provided on the lower periphery facing upward. The swirl vane support leg 15c extends upward from the lower periphery (fitting portion 15b) of the cutout portion 15a. When viewed from the front, the swirl vane support leg 15c has a right-angled triangular shape that is convex upward. A swirl vane 15d is provided at the upper end of the swirl vane support leg 15c. The position, shape, size, and other configurations (form, aspect) of the swirl vane 15d may be the same as those of the swirl vane 21b according to the first embodiment.

[0053] It is preferable that the swirl vane 15d has a protrusion or plate-like reinforcing rib 15e on the underside thereof to suppress vibration of the swirl vane 15d. In particular, it is preferable that the reinforcing rib 15e connects the underside of the swirl vane 15d with the inner surface of the swirl vane support leg 15c, and it is preferable that the swirl vane 15d, the reinforcing rib 15e, and the swirl vane support leg 15c are integrally configured. When the reinforcing rib 15e is a flat plate, it is preferable that the plane of the reinforcing rib 15e is parallel to the central axis O, and the reinforcing rib 15e may be configured as a plane parallel to the central axis O.

[0054] When the plane of the reinforcing rib 15e is arranged so that it is parallel to the central axis O, it is preferable that the reinforcing rib 15e have a draft gradient by decreasing in thickness toward the bottom. The number of reinforcing ribs 15e is not particularly limited, and may be one or more. When multiple reinforcing ribs 15e are arranged on the swirl vane 15d, it is preferable that the multiple reinforcing ribs 15e are parallel to each other. Therefore, when the reinforcing ribs 15e are inclined toward the central axis O, it is preferable that the inclination angle of each reinforcing rib 15e is the same, and it is not necessary that all reinforcing ribs 15e are strictly inclined toward the central axis O.

[0055] In this case where the intermediate tube 15 and the support member 24 are combined and the intermediate tube 15 (support member 24) is injection molded integrally with the swirl vane 15d, it is possible to adopt injection molding (so-called insert molding) in which the fire-resistant layer is an insert part. In this case, when the insert is a pipe with a certain shape (for example, Eslon (registered trademark) fireproof VP pipe (manufactured by Sekisui Chemical Co., Ltd.)), one possible molding method is to hold the axial end of the insert in the mold. In this case, since the axial end of the insert will be exposed from the injection molded product after injection molding, it is preferable to cut and remove this end in a post-processing step. On the other hand, when the insert item is a relatively flexible material that does not have a fixed shape (such as a fireproof sheet) and needs to be held in a tubular shape within the mold, one possible molding method is to provide a pin to hold the insert item in the core of the mold (the mold placed radially inside the insert item), and then remove this pin during the injection molding process.

[0056] (Third embodiment) Next, a drainage manifold 10B according to a third embodiment of the present invention will be described with reference to FIGS. In the third embodiment, the same components as those in the second embodiment are denoted by the same reference numerals, and the description thereof will be omitted, with only the differences being described.

[0057] In the drainage manifold 10B according to this embodiment, as in the second embodiment, the intermediate pipe 15 also serves as the support member 24. However, in this embodiment, the intermediate pipe 15 does not have a cutout 15a, and the entire intermediate pipe 15 functions as the fitting portion 15b. The support member 24 has the fitting portion 15b but does not have the swirl vane support leg portion 15c. In this embodiment, the outer end of the swirl vane 15d is fixed to the inner circumferential surface of the fitting portion 15b. As shown in FIG. 4, a recess 15f recessed inward may be formed in a portion of the peripheral wall of the fitting portion 15b (intermediate tube 15), thereby forming swirl vanes 15d on the inner surface of the fitting portion 15b. The recess 15f is recessed radially inward. Furthermore, a rib (not shown) may be provided in this recess 15f. The rib may extend in the circumferential direction or in the vertical direction. A plurality of ribs may be provided in the recess 15f, or only one rib may be provided. The presence of a rib can improve the strength of the recess 15f. The rib and the recess 15f are not necessarily required.

[0058] Here, a drainage manifold joint 10B1 according to a modified example of the third embodiment is shown in FIGS. In the drainage collecting joint 10B1 according to this modification, the reinforcing rib 15e may not be provided. When the reinforcing rib 15e is not provided, the reinforcing protrusion 15g may be provided. In this way, the reinforcing portion 15h shown as the reinforcing rib 15e or the reinforcing protrusion 15g may be provided, or the reinforcing portion 15h may not be provided at all.

[0059] In this modified drainage manifold 10B1, the reinforcing protrusion 15g bulges into the mating portion 15b. As shown in FIG. 5, the reinforcing protrusion 15g is provided on the underside of the swirl vane 15d over substantially the entire circumferential length. The surface of the reinforcing protrusion 15g includes a first surface 15g1, a second surface 15g2, and a third surface 15g3, which are arranged in circumferential order. The first surface 15g1, the second surface 15g2, and the third surface 15g3 are all concavely curved. The centers of curvature of the first surface 15g1, the second surface 15g2, and the third surface 15g3 are located, for example, inside the mating portion 15b. The first surface 15g1 and the second surface 15g2 are each equal in vertical dimension, and the combined vertical dimension of the first surface 15g1 and the second surface 15g2 exceeds half the vertical dimension of the swirl vane 15d.

[0060] (Fourth embodiment) FIG. 8 is a cross-sectional view showing an example of a joint structure in which a drainage collection joint according to a fourth embodiment of the present invention is applied to a fire-resistant structure. The drainage manifold 10C according to this embodiment is provided with an intermediate pipe 50 having a different structure from the intermediate pipe 15 used in the first embodiment. The intermediate pipe 50 according to this embodiment is equivalent to the intermediate pipe 15 in terms of inner and outer diameter, height, thickness, shape, etc., but is made of a resin that does not contain thermally expandable graphite, such as a polyvinyl chloride resin. Alternatively, it is made of a polyvinyl chloride resin composition that contains 0.1 to 1.0 part by weight of non-expandable graphite per 100 parts by weight of polyvinyl chloride resin.

[0061] This embodiment is characterized in that a fire-resistant member 51 made of a heat-expandable fire-resistant material such as heat-expandable graphite is provided around the outer periphery of the lower end 9 of the upper connecting pipe 11 located outside the intermediate pipe 50 and the outer periphery of the connecting pipe portion 16 located outside the intermediate pipe 50. The fire-resistant member 51 can be configured by wrapping a heat-expandable fire-resistant sheet or tape containing heat-expandable graphite. In this way, in this embodiment, the fire-resistant member 51 is wrapped around the portions of the upper connecting pipe 11 and the lower connecting pipe 12 located radially outward of the swirl vane 21b.

[0062] The refractory member 51 is made of the same material as that of the intermediate pipe 15 of the first embodiment. That is, the fire-resistant member 51 may have a single-layer structure entirely made of a resin composition containing a heat-expandable fire-resistant material, or a multi-layer structure consisting of multiple layers including a sound-insulating layer, a sound-absorbing layer, etc. In the case of a multi-layer structure, any one of the layers of the fire-resistant member 51 may be 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 connecting pipe 11 or the lower connecting pipe 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 member 51 may have 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 50 does not contain thermally expandable graphite, the fire-resistant member 51 may be a sheet-shaped fire-resistant material containing thermally expandable graphite wrapped around the outer surface of the intermediate pipe 50 or the outer surface of the sound-insulating material covering the intermediate pipe 50, and the fire-resistant material may be embedded in the slab penetration portion.

[0063] The refractory member 51 of this embodiment may be formed to have the same height as the intermediate pipe 15 of the previous embodiment. That is, the refractory member 51 may be formed to have a height of 30 mm or more and 150 mm or less. The other structures are the same as those of the first embodiment, and therefore a description of the other structures will be omitted.

[0064] When the structure of the fourth embodiment is applied to a floor slab S, a fire-resistant member 51 is embedded inside the through-hole H. Even when heated during a fire, the intermediate pipe 50 does not expand, but the thermally expandable graphite contained in the fire-resistant member 51 expands. When a fire occurs, the heated fire-resistant member 51 expands to crush the lower end 9 of the upper connecting pipe 11, the connecting pipe portion 16, and the intermediate pipe 15, which have been softened by the heat, and closes the through-hole H. As a result, flames and smoke from a fire that has broken out on a lower floor are not transmitted to an upper floor through the through-hole H, thereby achieving fire resistance.

[0065] 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.

[0066] The intermediate pipe 15 may not be provided. For example, the lower end 9 of the upper connecting pipe 11 may be a spigot or socket, and the upper end (connecting pipe portion 16) of the lower connecting pipe 12 may be a socket or spigot, and the lower end 9 of the upper connecting pipe 11 and the upper end of the lower connecting pipe 12 may be fitted together without the intermediate pipe 15 interposed therebetween. The blocking plate 13a may be omitted.

[0067] 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.

[0068] (Addendum) The embodiment can be understood, for example, as follows.

[0069] <1> A collective joint according to one embodiment of the present invention comprises an upper connecting pipe, a lower connecting pipe arranged below the upper connecting pipe, a blade member arranged between the upper connecting pipe and the lower connecting pipe and positioned in a slab penetration hole, and a support member fixed to at least one of the upper connecting pipe and the lower connecting pipe and supporting the entire length of the outer end of the blade member, which is the end facing radially outward.

[0070] The blade members are positioned in the slab through-holes, so that the sound (vibration) generated when wastewater hits the blade members is absorbed by, for example, the slab and is less likely to be transmitted to the outside. The support member supports the entire length of the outer end of the blade member, so that when wastewater hits the blade member, the blade member is less likely to vibrate and generate noise. As a result, it is possible to suppress the generation of noise caused by drainage.

[0071] <2> the above <1> In the collective joint according to the above, the support member may have a fitting portion fitted into at least one of the upper connecting pipe and the lower connecting pipe, and a support portion extending in the vertical direction from the fitting portion, and the outer end of the blade member may be fixed to the upper end or the lower end of the support portion.

[0072] <3> the above <1> In the collective joint according to the above, the support member may have a fitting portion fitted into at least one of the upper connecting pipe and the lower connecting pipe, and the outer end of the blade member may be fixed to the inner surface of the fitting portion.

[0073] <4> the above <2> or <3> In the joint assembly according to the above, the fitting portion may be configured to connect the upper connecting pipe and the lower connecting pipe.

[0074] <5> the above <2> from <4> In the collective joint according to any one of the above aspects, the fitting portion may have a fire-resistant layer.

[0075] <6> the above <1> from <5> In any one of the above embodiments, the collecting joint may have a configuration in which a fire-resistant material is wrapped around the portions of the upper connecting pipe and the lower connecting pipe that are located radially outward of the blade members.

[0076] <7> the above <1> from <6> In any one of the embodiments of the collective joint, a configuration may be adopted in which no other blade members different from the blade members are provided above the slab penetration hole in the upper connecting pipe. [Explanation of symbols]

[0077] 10, 10A, 10B, 10B1, 10C Drainage manifold joint (manifold joint) 11 Upper connecting pipe 12 Lower connecting pipe 15b, 21a mating part 15d, 21b Swirling blades (blade members) 24 Support member 51 Fire-resistant materials H Slab penetration hole (penetration hole)

Claims

1. An upper connecting pipe; a lower connecting pipe disposed below the upper connecting pipe; A blade member is disposed between the upper connecting pipe and the lower connecting pipe and positioned in the slab penetration hole; a support member fixed to at least one of the upper connecting pipe and the lower connecting pipe, and supporting the entire length of the outer end, which is the end facing radially outward of the blade member.

2. The support member is a fitting portion fitted to at least one of the upper connecting pipe and the lower connecting pipe; a support portion extending in a vertical direction from the fitting portion, The assembly joint according to claim 1 , wherein the outer ends of the blade members are fixed to the upper or lower ends of the support portions.

3. The support member is a fitting portion fitted to at least one of the upper connecting pipe and the lower connecting pipe, The assembly joint according to claim 1 , wherein the outer ends of the blade members are fixed to the inner circumferential surface of the fitting portion.

4. The joint assembly according to claim 2 or 3, wherein the fitting portion connects the upper connecting pipe and the lower connecting pipe.

5. The assembly joint according to claim 2 or 3, wherein the fitting portion has a fire-resistant layer.

6. The collective joint according to claim 1 , wherein a fire-resistant material is wrapped around portions of the upper connecting pipe and the lower connecting pipe that are positioned radially outward of the blade members.

7. The collective joint according to claim 1 , wherein no blade member different from the blade member is provided on the upper connecting pipe above the slab penetration hole.

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