Joints

Abstract

To obtain a joint with improved drainage performance. [Solution] The manifold (10) comprises an upper connecting pipe (11) and a lower connecting pipe arranged below the upper connecting pipe (11), and the upper connecting pipe (11) comprises a main pipe (13) extending in the vertical direction and a side pipe (8) protruding radially outward from the main pipe (13), the inside of the side pipe (8) being connected to the main pipe (13), and the radially outer end of the side pipe (8) being closed.

Description

[Technical Field]

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

[0002] For example, a joint described in Patent Document 1 is known. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2014-58849 Summary of the Invention [Problem to be solved by the invention]

[0004] In recent years, for example, as buildings have become taller, there has been a demand for joints with high drainage performance.

[0005] The present invention has been made to solve these problems, and has as its object to provide a joint with improved drainage performance. [Means for solving the problem]

[0006] In order to achieve the above-mentioned object, the joint of the present invention comprises an upper connecting pipe and a lower connecting pipe arranged below the upper connecting pipe, the upper connecting pipe comprising a main pipe extending in the vertical direction and a side pipe protruding radially outward from the main pipe, the interior of the side pipe being connected to the main pipe through the radially inner end of the side pipe, and the radially outer end of the side pipe being closed. [Effects of the Invention]

[0007] As described above, the present invention has the effect of providing a joint with improved drainage performance. [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] 2 is a longitudinal cross-sectional view of an upper connecting pipe included in the joint assembly shown in FIG. 1. FIG. [Figure 3] FIG. 3 is a cross-sectional view taken along the line III-III in FIG. 2. [Figure 4] FIG. 4 is a cross-sectional view taken along the line IV-IV in FIG. [Figure 5] FIG. 10 is a longitudinal cross-sectional view of an upper connecting pipe included in a joint assembly according to a second embodiment of the present invention. [Figure 6] 6 is a cross-sectional view taken along the line VI-VI in FIG. 5. [Figure 7] FIG. 10 is a longitudinal cross-sectional view of an upper connecting pipe included in a joint assembly according to a third embodiment of the present invention. [Figure 8] FIG. 10 is a longitudinal cross-sectional view of an upper connecting pipe included in a joint assembly according to a fourth embodiment of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0009] (First embodiment) Hereinafter, with reference to Figs. 1 to 4, 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 joint structure 1 according to this embodiment is used for drainage of a building, and is applied to a through-hole H 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 (main pipe) connectable to a first vertical pipe P1, a horizontal pipe connecting portion 14 (opening) 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 extends in the vertical direction. The vertical pipe connection part 13 has a blocking plate 13a (backflow prevention rib) on its inner surface. The blocking plate 13a is installed at an angle of -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 within 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 portion 14 (hereinafter also referred to as a first horizontal pipe connecting portion 14A (first opening)) extends 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 embodiment and can be changed as desired. For example, the number of horizontal branch connecting portions 14 does not have to be two or more, and may be one or none. 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] In this embodiment, as shown in FIGS. 2 to 4 , the upper connecting pipe 11 further includes a side pipe 8. The side pipe 8 protrudes radially outward from the vertical pipe connecting portion 13. The side pipe 8 and the horizontal pipe connecting portion 14 are disposed at equal vertical positions. The fact that the positions of the side pipe 8 and the horizontal pipe connecting portion 14 are equal vertically may mean that at least a portion of one of the side pipe 8 and the horizontal pipe connecting portion 14 is located at the same height (vertical position) as at least a portion of the other. In the illustrated example, the outer surface 8a at the pipe bottom of the side pipe 8 and the outer surface 14a at the pipe bottom of the horizontal pipe connecting portion 14 are at equal vertical positions. The fact that these outer surfaces 8a, 14a are at equal vertical positions may mean, for example, that one outer surface is not more than 10 mm apart from the other outer surface.

[0015] The side pipe 8 faces the first horizontal pipe connection portion 14A across the central axis O. As shown in FIG. 4 , four pipes, including three horizontal pipe connection portions 14 and one side pipe 8, are arranged circumferentially at 90° intervals. The aforementioned damming plates 13a are arranged between adjacent horizontal pipe connection portions 14 in the circumferential direction, and between adjacent horizontal pipe connection portions 14 and side pipes 8 in the circumferential direction. Four damming plates 13a are arranged at intervals in the circumferential direction. The damming plates 13a are adjacent to the horizontal pipe connection portions 14 and the side pipe 8 in the circumferential direction. The damming plates 13a prevent wastewater from backflowing into the horizontal pipe connection portions 14 and the side pipe 8.

[0016] As shown in Figures 3 and 4, the interior of the side pipe 8 is in communication with the vertical pipe connection portion 13. The radially outer end of the side pipe 8 is closed. The radially outer end of the side pipe 8 is closed by a closing portion 7. In this embodiment, the closing portion 7 is integral with the side pipe 8. A space S1 is formed within the side pipe 8 by the side pipe 8 and the closing portion 7. The space S1 is in communication with the internal space of the vertical pipe connection portion 13. The opening area (cross-sectional area of ​​the flow path) of the side pipe 8 is equal to the opening area (cross-sectional area of ​​the flow path) of the horizontal pipe connecting portion 14. Here, "the opening areas are equal" may mean, for example, that the difference in the opening areas is within 10% of the larger opening area. Furthermore, the inner surface 8b at the pipe bottom of the side pipe 8 may be inclined downward from the outer side to the inner side in the radial direction. In this case, the wastewater that has flowed into the space S1 is more likely to return into the vertical pipe connecting portion 13.

[0017] Side pipe 8 may be disposed at the same position in the vertical direction as swirl vane 21b (see FIG. 1). In this case, at least a part of swirl vane 21b may be disposed between the upper end and the lower end of side pipe 8.

[0018] 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.

[0019] 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.

[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 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.

[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 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.

[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 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.

[0033] The lower connecting pipe 12 is a pipe body whose diameter is smaller below than above. The lower connecting pipe 12 is disposed below the upper connecting pipe 11. 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.

[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. 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.

[0035] 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.

[0036] 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.

[0037] 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, and a swirl vane support leg 21c. 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.

[0038] 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.

[0039] 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.

[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 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.

[0041] 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.

[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] "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 interior of the side pipe 8 communicates with the vertical pipe connection portion 13, and the radially outer end of the side pipe 8 is closed. Therefore, not only the internal space of the vertical pipe connection portion 13 but also the internal space (space S1) of the side pipe 8 contributes to drainage. As a result, drainage capacity is improved.

[0051] The upper connecting pipe 11 is equipped with a horizontal pipe connecting portion 14. Therefore, for example, when wastewater flows into the upper connecting pipe 11 through the horizontal pipe connecting portion 14, the wastewater tends to stagnate in the upper connecting pipe 11. Therefore, the effect of improving the drainage capacity as described above is significantly achieved. The upper connecting pipe 11 is equipped with swirl vanes 21b. Therefore, for example, when the drainage water in the upper connecting pipe 11 comes into contact with the swirl vanes 21b, the drainage water tends to be locally stagnated near the swirl vanes 21b. Therefore, the effect of improving the drainage capacity as described above is significantly achieved.

[0052] The first horizontal pipe connecting portion 14A faces the side pipe 8 across the central axis O. Therefore, for example, when the side pipe 8 is injection molded, the mold placed on the inner surface of the side pipe 8 can be pulled out of the side pipe 8 through the first horizontal pipe connecting portion 14A.

[0053] The outer surface 8a at the pipe bottom of the side pipe 8 and the outer surface 14a at the pipe bottom of the horizontal pipe connection part 14 are at the same position in the vertical direction. Therefore, for example, when constructing the drainage manifold joint 10, it is possible to easily bring the pipe bottom of the side pipe 8 and the pipe bottom of the horizontal pipe connection part 14 close to the upper surface of the floor slab S to the same extent. As a result, it is possible to, for example, make it easier to lower the underfloor space and make the above-floor space higher.

[0054] The damming plate 13a is adjacent to the side pipe 8 in the circumferential direction. Therefore, the drainage water is less likely to flow back into the space S1 inside the side pipe 8.

[0055] (Second embodiment) Next, a drainage manifold 10A according to a second embodiment of the present invention will be described with reference to FIGS. 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.

[0056] In the drainage manifold 10A according to this embodiment, the side pipe 8 and the closing section 7 are separate bodies. The closing section 7 is attached to the side pipe 8. The blocking portion 7 includes a main body 7a and a packing 7b. The main body 7a includes a plate portion 7a1 and a pipe portion 7a2. The plate portion 7a1 is in contact with the end face of the side pipe 8. The pipe portion 7a2 protrudes radially inward from the plate portion 7a1. The pipe portion 7a2 is fitted into the side pipe 8. The pipe portion 7a2 may have a tapered shape that expands radially inward. The packing 7b seals the gap between the inner peripheral surface of the side pipe 8 and the outer peripheral surface of the main body 7a. The packing 7b is fitted to the outer peripheral surface of the end of the pipe portion 7a2 on the plate portion 7a1 side. In the illustrated example, an annular groove 7c is provided at the end of the pipe portion 7a2. The packing 7b is fitted into the groove 7c.

[0057] (Third embodiment) Next, a drainage manifold 10B according to a third embodiment of the present invention will be described with reference to FIG. 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.

[0058] In the drainage manifold 10B according to this embodiment, the swirl vanes 21b are molded integrally with the vertical pipe connection portion 13. The swirl vanes 21b are provided on the inner peripheral surface of the vertical pipe connection portion 13. Furthermore, the drainage manifold 10B is provided with a reinforcing protrusion 13b (reinforcing portion) that reinforces the swirl vanes 21b. The reinforcing protrusion 13b bulges into the vertical pipe connection portion 13. The reinforcing protrusion 13b is provided integrally with the swirl vanes 21b on the underside of the swirl vanes 21b in approximately half of the area located on a first circumferential side relative to the circumferential center. The reinforcing protrusion 13b has a first surface 13b1 facing radially inward, a second surface 13b2 facing a second circumferential side, and a third surface 13b3 connecting the first surface 13b1 and the second surface 13b2. The first surface 13b1 protrudes radially inward compared to the second surface 13b2. The amount of radial inward protrusion of the first surface 13b1 decreases from top to bottom. The circumferential size of the first surface 13b1 increases from top to bottom. The radial size of the second surface 13b2 decreases from top to bottom. The third surface 13b3 connects the second-side edge of the first surface 13b1 to the radially inner edge of the second surface 13b2. In cross section, the third surface 13b3 has a curved shape that protrudes toward the inside of the vertical pipe connecting portion 13. Note that instead of the reinforcing protrusion 13b, the outer peripheral surface of the vertical pipe connecting portion 13 may have a recess that is recessed radially inward at a portion corresponding to the reinforcing protrusion 13b. Furthermore, a plate-shaped reinforcing rib may be provided instead of the reinforcing protrusion 13b.

[0059] (Fourth embodiment) Next, a drainage manifold 10C according to a fourth embodiment of the present invention will be described with reference to FIG. 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.

[0060] In the drainage manifold 10C according to this embodiment, the outer surface 8a and inner surface 8b at the bottom of the side pipe 8 extend downward from the outside to the inside in the radial direction. The outer surface 8a and the inner surface 8b are generally parallel, and the wall thickness at the bottom of the side pipe 8 is uniform regardless of the radial position.

[0061] 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.

[0062] 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 upper connecting pipe 11 and the lower connecting pipe 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 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 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.

[0063] The outer surface 8a at the pipe bottom of the side pipe 8 and the outer surface 14a at the pipe bottom of the horizontal pipe connecting portion 14 do not have to be at the same position in the vertical direction. The positions of the side pipe 8 and the horizontal pipe connecting portion 14 do not have to be at the same position in the vertical direction. The first horizontal pipe connecting portion 14A may not be provided. That is, the horizontal pipe connecting portion 14 may not be provided at a position facing the side pipe 8 with the central axis O therebetween. The horizontal pipe connection portion 14 may be omitted. The drainage manifold joints 10, 10A, 10B, and 10C may be so-called reducer joints. The swirl vanes 21b may be omitted. The blocking plate 13a may be omitted.

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

[0065] (Addendum) The embodiment can be understood, for example, as follows.

[0066] <1> A fitting according to one aspect of the present invention comprises an upper connecting pipe and a lower connecting pipe arranged below the upper connecting pipe, the upper connecting pipe comprising a main pipe extending in the vertical direction and a side pipe protruding radially outward from the main pipe, the interior of the side pipe being connected to the main pipe, and the radially outer end of the side pipe being closed.

[0067] The inside of the side pipe is connected to the main pipe, and the radially outer end of the side pipe is closed. Therefore, not only the internal space of the main pipe but also the internal space of the side pipe contributes to drainage, resulting in improved drainage capacity.

[0068] <2> the above <1> In the joint according to the above, the upper connecting pipe may further have an opening in the main pipe that is arranged at a position equivalent in the vertical direction to that of the side pipe.

[0069] The upper connecting pipe has an opening. Therefore, for example, when wastewater flows into the upper connecting pipe through the opening, the wastewater tends to stagnate in the upper connecting pipe. Therefore, the effect of improving the drainage capacity as described above is significantly achieved.

[0070] <3> the above <2> In the joint according to the above, a configuration may be adopted in which two or more of the openings are provided.

[0071] <4> the above <2> or <3> In the joint according to the above, a configuration may be adopted in which the opening includes a first opening that faces the side pipe across the pipe axis of the main pipe.

[0072] The first opening faces the side tube across the tube axis, so that, for example, when injection molding the side tube, the mold placed on the inner surface of the side tube can be pulled out to the outside of the side tube through the first opening.

[0073] <5> the above <2> from <4> In any one of the above embodiments of the fitting, the opening is a pipe that protrudes radially outward from the main pipe, and the outer surface of the bottom of the side pipe and the outer surface of the bottom of the opening are at the same position in the vertical direction as described in claim 2 may be adopted.

[0074] The outer surface of the bottom of the side pipe and the outer surface of the bottom of the pipe at the opening are at the same vertical position. Therefore, for example, when constructing the joint, it is easier to bring the bottom of the side pipe and the bottom of the pipe at the opening into the same proximity to the top surface of the slab. As a result, it is easier to lower the underfloor space and raise the abovefloor space, for example.

[0075] <6> the above <1> from <5> In the joint according to any one of the above aspects, the upper connecting pipe may further include a blade member disposed at the same position as the side pipe in the up-down direction.

[0076] The upper connecting pipe is equipped with a blade member. Therefore, for example, if the drainage water in the upper connecting pipe comes into contact with the blade member, the drainage water tends to be locally stagnated near the blade member. Therefore, the effect of improving the drainage capacity as described above is significantly achieved.

[0077] <7> the above <1> from <6> In the joint according to any one of the above aspects, the upper connecting pipe may further include a backflow prevention rib that is adjacent to the side pipe in the circumferential direction.

[0078] The backflow prevention rib is adjacent to the side pipe in the circumferential direction, which makes it difficult for wastewater to backflow into the space inside the side pipe. [Explanation of symbols]

[0079] 8 Lateral canal 10, 10A, 10B, 10C Drainage manifold joint (joint) 11 Upper connecting pipe 12 Lower connecting pipe 13 Vertical pipe connection part (main pipe) 13a Dam plate (backflow prevention rib) 14 Horizontal pipe connection (opening) 14A First horizontal pipe connection (first opening) 21b Swirling blade (blade member)

Claims

1. An upper connecting pipe; a lower connecting pipe disposed below the upper connecting pipe, the upper connecting pipe includes a main pipe extending in the vertical direction and a side pipe protruding radially outward from the main pipe, The inside of the side pipe communicates with the main pipe, The radially outer end of the side pipe is closed, the fitting.

2. 2. The joint according to claim 1, wherein the upper connecting pipe further comprises an opening disposed in the main pipe at a position equivalent in the vertical direction to that of the side pipe.

3. The joint of claim 2 , wherein two or more openings are provided.

4. 3. The joint according to claim 2, wherein the opening comprises a first opening facing the side pipe across the pipe axis of the main pipe.

5. the opening is a tube that protrudes radially outward from the main tube, 3. The joint according to claim 2, wherein an outer surface of the pipe bottom of the side pipe and an outer surface of the pipe bottom of the opening are at the same position in the vertical direction.

6. 2. The joint according to claim 1, wherein the upper connecting pipe further comprises a blade member disposed at a position equivalent to that of the side pipe in the vertical direction.

7. The joint according to claim 1 , wherein the upper connecting pipe further comprises a backflow prevention rib circumferentially adjacent to the side pipe.

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