Drain pipe joint, piping structure and building

Abstract

To prevent water leakage in various parts of a building.SOLUTION: The present invention relates to a drain pipe joint 5 installed in a through hole 26 provided in a floor slab 14 of a building 1, which is placed at the connection between a vertical pipe 3 and a horizontal pipe 4, comprising at least a vertical pipe connection portion 11 provided at an upper end thereof, and including an upper joint member 13 having a horizontal pipe connecting portion 12 on the side surface and a lower joint member 16 having a vertical pipe connecting portion 15 at the lower end portion. The upper joint member 13 and the lower joint member 16 are each composed of a resin injection molded product. The upper end of the lower joint member 16 is provided with an outer fitting portion 61 that can fit the lower end of the upper joint member 13 in an inserted state. The upper edge portion of the outer fitting portion 61 of the lower joint member 16 is embedded so as to project above the upper surface of the floor slab 14.SELECTED DRAWING: Figure 7

Description

Technical Field

[0001] This invention relates to a drain pipe joint, a piping structure, and a building.

Background Art

[0002] In apartment buildings, office buildings, etc., water supply facilities and drainage facilities are provided. Among these, the drainage facilities have a piping structure in which a vertical pipe penetrating vertically through each floor of the building and a horizontal pipe installed within each floor are connected using a drain pipe joint.

[0003] And the above-mentioned drain pipe joint is provided at the connection portion between the vertical pipe and the horizontal pipe, and has at least an upper joint member having a vertical pipe connection portion at its upper end and a horizontal pipe connection portion on its side surface, a lower joint member having a vertical pipe connection portion at its lower end, and a blade member installed inside the lower joint member and having a swirling blade that gives a swirling flow to the fluid flowing inside (see, for example, Patent Document 1).

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] However, in such a drain pipe joint, it is difficult to prevent fine gaps from occurring in each part. However, if there are such fine gaps, there is a risk that these fine gaps will become water channels and water leakage will occur. Therefore, there has been a desire to minimize the fine gaps as much as possible.

[0006] For example, in the case of the above-mentioned drain pipe joint, the portion between the upper joint member and the lower joint member is a fitting portion, but there is a risk that this fitting portion will become a water channel.

[0007] Therefore, the main object of the present invention is to solve the above-described problems.

Means for Solving the Problems

[0008] In order to solve the above problems, the present invention is provided at the connection portion between the vertical pipe and the horizontal pipe, and includes at least an upper joint member having a vertical pipe connection portion at its upper end and a horizontal pipe connection portion on its side surface, and a lower joint member having a vertical pipe connection portion at its lower end. In a drain pipe joint installed in a through hole provided in a floor slab of a building, the upper joint member and the lower joint member are each composed of an injection molded product made of resin, an outer fitting portion is provided at the upper end portion of the lower joint member, and the lower end portion of the upper joint member can be fitted in an inserted state, and the upper edge portion of the outer fitting portion of the lower joint member is embedded in a state of protruding upward from the upper surface of the floor slab.

Effects of the Invention

[0009] According to the present invention, with the above configuration, it is possible to prevent water leakage by eliminating the water passage.

Brief Description of the Drawings

[0010]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8

Mode for Carrying Out the Invention

[0011] Hereinafter, this embodiment will be described in detail with reference to the drawings. Figs. 1 to 8 are for explaining this embodiment.

Example

[0012] <Configuration> Hereinafter, the configuration will be described.

[0013] Drainage facilities are provided in apartment buildings, office buildings, etc. This drainage facility is provided with a piping structure 6 in which a vertical pipe 3 penetrating each floor 2 of a building 1 vertically and a horizontal pipe 4 installed in each floor 2 are connected using a drain pipe joint 5 as shown in Fig. 1.

[0014] The above-described drain pipe joint 5 is provided at the connection portion between the vertical pipe 3 and the horizontal pipe 4. As shown in FIG. 2 (or FIG. 3), it has at least a vertical pipe connection portion 11 at its upper end and a horizontal pipe connection portion 12 on its side surface, an upper joint member 13, a lower joint member 16 having a vertical pipe connection portion 15 at its lower end, and a blade member 19 installed inside the lower joint member 16 and having a swirling blade 18 for imparting a swirling flow to the fluid flowing inside.

[0015] Here, the drain pipe joint 5 is in the shape of a cylinder extending substantially in the vertical direction. The vertical pipe connection portions 11 and 15 are for connecting the vertical pipe 3, and the horizontal pipe connection portion 12 is for connecting the horizontal pipe 4.

[0016] An expansion joint 21 (see FIG. 2) capable of absorbing the influence of thermal expansion and contraction of the vertical pipe 3 is adhesively fixed to the vertical pipe connection portion 11 of the upper joint member 13. This expansion joint 21 is formed by installing a seal member 23 capable of allowing displacement due to thermal expansion and contraction of the vertical pipe 3 inside a short cylindrical joint body 22. This seal member 23 has at least a ring-shaped seal body 23a and a lip portion 23b integrally protruding inward from the inner peripheral portion of the seal body 23a so as to be inclined. A ring-shaped cap portion 24 for holding the seal member 23 so that it cannot fall off is attached to the upper end portion of the joint body 22. Note that a swirling blade or the like extending substantially downward may be provided at the lower portion of the joint body 22.

[0017] Also, the horizontal pipe connection portion 12 is a socket portion or a spigot portion capable of adhesively fixing the horizontal pipe 4. When the horizontal pipe connection portion 12 is a socket portion, a stopper 12a for regulating the insertion position of the horizontal pipe 4 is provided inside the horizontal pipe connection portion 12. Note that an expansion joint 21 similar to the above can also be attached to the horizontal pipe connection portion 12 and used. Further, when a plurality of horizontal pipe connection portions 12 are provided on the upper joint member 13, a backflow prevention rib 13a for preventing the drainage flowing in from the horizontal pipe connection portion 12 from flowing back to other horizontal pipe connection portions 12 is provided inside the upper joint member 13.

[0018] As shown in FIG. 1, the floor slab 14 is provided with a through hole 26 for passing the drain pipe joint 5 (the lower joint member 16). This through hole 26 is filled back with mortar 27.

[0019] The lower joint member 16 is provided with cylindrical portions (a receiving port portion or a spigot portion) at its upper and lower ends, and has a tapered portion that tapers downward between these cylindrical portions. The vertical pipe connection portion 15 described above is a receiving port portion or a spigot portion into which the vertical pipe 3 can be directly inserted and adhesively fixed, and is integrally formed at the lower end of the lower joint member 16. Note that the lower joint member 16 can be buried in the floor slab 14 (see FIG. 1) of the building 1.

[0020] And in order to use the floor slab 14 as a fire compartment wall, the lower joint member 16 is provided with a resin composition such as a fire-resistant heat-expandable resin pipe. This fire-resistant heat-expandable resin pipe is mainly composed of a fire-resistant heat-expandable resin containing heat-expandable graphite with respect to a resin base material such as a polyvinyl chloride-based resin, for example. And when a fire occurs, the heat-expandable graphite expands thermally, thereby closing the drain pipe joint 5, the through hole 26, etc., and enabling the floor slab 14 to maintain its function as a fire compartment wall.

[0021] Here, although it will be a bit long, the details of the above-described fire-resistant heat-expandable resin pipe will be described.

[0022] In this embodiment, as the fire-resistant heat-expandable resin pipe, there is a single-layer structure of a fire-resistant expansion layer made of a fire-resistant heat-expandable resin composition containing 1 to 10 parts by weight of heat-expandable graphite with respect to 100 parts by weight of a polyvinyl chloride-based resin, or the fire-resistant heat-expandable resin pipe has a fire-resistant expansion layer made of a fire-resistant heat-expandable resin composition containing 1 to 15 parts by weight of heat-expandable graphite with respect to 100 parts by weight of a polyvinyl chloride-based resin, and a coating layer made of a heat-expandable graphite-free polyvinyl chloride-based resin composition provided so as to cover the inner and outer surfaces of this fire-resistant expansion layer, and a three-layer structure is preferable.

[0023] Examples of the above polyvinyl chloride resin include a polyvinyl chloride homopolymer; a mixture of a polyvinyl chloride polymer and an impact modifier resin; a graft copolymer of a polyvinyl chloride polymer and an impact modifier resin; a copolymer of a vinyl chloride monomer and a monomer having an unsaturated bond copolymerizable with the vinyl chloride monomer; a graft copolymer obtained by graft copolymerizing vinyl chloride onto a (co)polymer other than vinyl chloride, etc. These may be used alone or in combination of two or more. Further, the above polyvinyl chloride resin may be chlorinated as necessary.

[0024] Examples of the impact modifier resin mixed with the above polyvinyl chloride polymer include resins having rubber properties such as acrylonitrile-butadiene-styrene copolymer, methyl methacrylate-butadiene-styrene copolymer, acrylic rubber, chlorinated polyethylene, ethylene-vinyl acetate copolymer resin, acrylonitrile-butadiene copolymer, etc. These may be used alone or in combination of two or more.

[0025] Examples of the impact modifier resin graft copolymerized with the above polyvinyl chloride polymer include the resins having the above rubber properties. By using a polyvinyl chloride resin obtained by mixing or graft copolymerizing the resin having the above rubber properties, the impact resistance of the polyvinyl chloride resin can be improved. In particular, it is preferable to use these resins for the blade member 19 hit by the drainage of the vertical pipe 3 and the upper joint member 13 hit by the drainage of the horizontal pipe 4.

[0026] The monomers having an unsaturated bond copolymerizable with the above vinyl chloride monomer are not particularly limited. For example, α-olefins such as ethylene, propylene, and butylene; vinyl esters such as vinyl acetate and vinyl propionate; vinyl ethers such as butyl vinyl ether and cetyl vinyl ether; (meth)acrylic acid esters such as methyl (meth)acrylate, ethyl (meth)acrylate, and butyl acrylate; aromatic vinyls such as styrene and α-methylstyrene; N-substituted maleimides such as N-phenyl maleimide and N-cyclohexyl maleimide, etc. These may be used alone or in combination of two or more.

[0027] The polymers for graft copolymerizing the above vinyl chloride are not particularly limited as long as they can graft copolymerize vinyl chloride. For example, ethylene-vinyl acetate copolymer, ethylene-vinyl acetate-carbon monoxide copolymer, ethylene-ethyl acrylate copolymer, ethylene-butyl acrylate-carbon monoxide copolymer, ethylene-methyl methacrylate copolymer, ethylene-propylene copolymer, acrylonitrile-butadiene copolymer, polyurethane, chlorinated polyethylene, chlorinated polypropylene, etc. These may be used alone or in combination of two or more.

[0028] Any of the above polyvinyl chloride-based resins may be crosslinked or modified within a range that does not inhibit the fire resistance as a resin composition. In this case, a resin that has been crosslinked or modified in advance may be used, or when blending additives, etc., it may be crosslinked or modified simultaneously, or it may be crosslinked or modified after blending the above components into the resin. There is also no particular limitation on the crosslinking method of the above resin, and examples include ordinary crosslinking methods for polyvinyl chloride-based resins, such as crosslinking using various crosslinking agents and peroxides, crosslinking by electron beam irradiation, and methods using water crosslinkable materials.

[0029] In addition, as long as the refractory heat-expandable resin pipe can be such that when heated by a flame or the like, the refractory expansion layer expands to close or nearly close the inside of the pipe, it may be a single-layer one with only the refractory expansion layer, or may have a multi-layer structure in which resin layers made of a resin composition containing no expanded graphite within a range not inhibiting the refractory performance of the refractory expansion layer are provided on the inner and outer surfaces of the refractory expansion layer.

[0030] In the case of the above single-layer structure product, the refractory heat-expandable resin composition forming the refractory expansion layer is not particularly limited, but it is preferably one containing expanded graphite in a proportion of 1 to 10 parts by weight, more preferably 1 to 8 parts by weight, and still more preferably 2 to 7 parts by weight with respect to 100 parts by weight of the polyvinyl chloride-based resin. This is because if the amount of expanded graphite is less than 1 part by weight, sufficient heat-expandability may not be obtained during combustion, and there is a risk that the desired fire resistance cannot be obtained. If it exceeds 10 parts by weight, it may expand too much due to heating, and the residue may fall off without being able to maintain its shape, resulting in a decrease in fire resistance.

[0031] On the other hand, in the case of the multi-layer structure product, the refractory heat-expandable resin composition forming the refractory expansion layer is not particularly limited, but it is preferably one containing expanded graphite in a proportion of 1 to 15 parts by weight, more preferably 1 to 12 parts by weight, and still more preferably 2 to 10 parts by weight with respect to 100 parts by weight of the polyvinyl chloride-based resin. This is because if the amount of expanded graphite is less than 1 part by weight, sufficient heat-expandability may not be obtained during combustion, and the desired fire resistance cannot be obtained. If it exceeds 15 parts by weight, it may expand too much due to heating, and the residue may fall off without being able to maintain its shape, resulting in a decrease in fire resistance.

[0032] Also, in the case of a multi-layer structure product in which the refractory expansion layer is formed of a refractory heat-expandable resin composition containing expanded graphite in a proportion of 1 to 15 parts by weight with respect to 100 parts by weight of the polyvinyl chloride-based resin as described above, it is preferable to have a three-layer structure in which the inner and outer surfaces of the refractory expansion layer are coated with a polyvinyl chloride-based resin composition containing no heat-expandable refractory material.

[0033] In the case of the multi-layer structure product with a three-layer structure as described above, it is preferable that the thickness of the coating layer covering the inner surface and the outer surface of the refractory tube is 0.2 to 2.0 mm respectively. This is because if the thickness of the coating layer covering the inner surface and the outer surface of the refractory expansion layer is less than 0.2 mm, the mechanical strength as a tube may be inferior, and if it exceeds 2.0 mm, the fire resistance may decrease.

[0034] The thermally expandable graphite used for the drain pipe joint 5 is a crystalline compound that maintains the layered structure of carbon obtained by subjecting powders such as natural flaky graphite, pyrolytic graphite, and kish graphite to acid treatment to insert an inorganic acid between the layers of graphite with inorganic acids such as concentrated sulfuric acid, nitric acid, and selenic acid and strong oxidizing agents such as concentrated nitric acid, perchloric acid, perchlorate, permanganate, dichromate, and hydrogen peroxide, and then adjusting the pH. It is preferable to use thermally expandable graphite adjusted to pH 1.5 to 4.0 and thermally expandable graphite with a 1.3-fold expansion temperature of 180°C to 240°C. This is because if the pH of the thermally expandable graphite is less than 1.5, the acidity is too strong and it is likely to cause corrosion of the molding device, and if the pH exceeds 4.0, the carbonization promoting effect of the polyvinyl chloride-based resin may weaken and sufficient fire resistance performance may not be obtained.

[0035] In addition, additives such as stabilizers, inorganic fillers, flame retardants, lubricants, processing aids, impact modifiers, heat resistance improvers, antioxidants, light stabilizers, ultraviolet absorbers, pigments, plasticizers, and thermoplastic elastomers may be added to the refractory thermally expandable resin composition forming the refractory expansion layer as long as the object of the present invention is not inhibited.

[0036] Details of the drain pipe joint 5 beyond this are omitted.

[0037] Then, as shown in FIG. 3, the above-described blade member 19 is configured such that the swivel blade 18 is attached to the lower portion of the ring-shaped member 19a. At this time, the upper surface 18a (swivel blade upper surface) where the drainage flowing down from the vertical pipe 3 of the swivel blade 18 hits is made flat, and the angle formed by this flat surface and the central axis of the lower joint member 16 is preferably 10° or more and 50° or less, and more preferably 20° or more and 40° or less. If the above-described angle exceeds 50°, the connection portion between the blade member 19 and the swivel blade 18 may be damaged due to the impact of the flowing-down drainage. Further, if the above-described angle is less than 10°, a sufficient swirling flow cannot be given to the flowing-down drainage, it becomes difficult to generate an air core in the drainage flow that suppresses pressure fluctuations in the piping structure 6, and there is a risk of breaking the trap of the drainage facility connected to the piping structure 6.

[0038] And with respect to the above basic or overall configuration, this embodiment has the following configuration.

[0039] (1) The upper joint member 13, the lower joint member 16, and the blade member 19 are each made of an injection-molded resin product. And as shown in FIG. 3 (FIG. 4), an injection gate 31 for resin is provided on at least one of the outer peripheral surfaces on the upper end side or the lower end side of the lower joint member 16.

[0040] (2) Also, as shown in FIG. 2, fitting portions 41 that can be fitted to each other are provided between the lower end portion of the upper joint member 13 and the upper end portion of the blade member 19 and the upper end portion of the lower joint member 16. And as shown in FIG. 5, a positioning portion 42 that can perform circumferential positioning is provided in this fitting portion 41. This positioning portion 42 is provided with a positioning rib 43 and a positioning concave groove portion 44 that houses and holds this positioning rib 43. And a rounded portion 46 is provided at the corner portion 45 of the positioning rib 43 and the positioning concave groove portion 44.

[0041] Here, between the lower end of the upper joint member 13 and the upper end of the blade member 19, there is a contact portion 47 (see FIG. 2) that can contact each other. And in the state where this contact portion 47 is in contact, between the lower end of the upper joint member 13, the upper end of the blade member 19, and the upper end of the lower joint member 16, there is a fitting portion 41 that can fit with each other.

[0042] Note that the upper end of the blade member 19 is the above-mentioned ring-shaped member 19a (the upper edge portion). And the lower end of the upper joint member 13 and the upper end of the blade member 19 are made to have the same inner and outer diameters. Also, the inner diameter or outer diameter of the lower end of the upper joint member 13 and the upper end of the blade member 19 is made the same as the outer diameter or inner diameter of the upper end of the lower joint member 16. In this case, as will be described later, the lower end of the upper joint member 13 and the upper end of the blade member 19 are inserted (fitted inside) into the upper end of the lower joint member 16. Therefore, the outer diameter of the lower end of the upper joint member 13 and the upper end of the blade member 19 is made the same as the inner diameter of the upper end of the lower joint member 16.

[0043] And the resin injection gates 31 in the injection molded upper joint member 13, the lower joint member 16, and the blade member 19 are provided at least at positions avoiding the surfaces that contact each other, that is, the contact portion 47 and the fitting portion 41. More specifically, among the upper joint member 13 and the blade member 19, for the outer surface from the lower end of the upper joint member 13 that is fitted inside the lower joint member 16 and contacts the lower joint member 16 to the lower end of the horizontal pipe connection portion 12, the outer surface of the ring-shaped member 19a of the blade member 19, the position where the contact portion 47 is located, and the position of the upper surface of the swivel blade of the blade member 19, the resin injection gate 31 is not provided in the mold during injection molding so that no gate mark, which is the trace of the injection gate 31, is generated. In addition, since the outer surfaces from the lower end of the upper joint member 13 to the horizontal pipe connection portion 12 and the outer surface of the ring-shaped member 19a of the blade member 19 are fitted and connected to the lower joint member 16, gaps may be generated due to non-smooth gate marks, which may cause water leakage. Also, if there is a gate mark at the position of the contact portion 47 between the lower end of the upper joint member 13 and the upper end of the blade member 19, a gap may be generated between the lower end of the upper joint member 13 and the upper end of the blade member 19, which may cause water leakage. Furthermore, since the upper surface 18a of the turning blade 18 of the blade member 19 allows the drainage flow to pass, if there is a gate mark, debris such as hair in the drainage may get caught, and the drainage performance may gradually deteriorate. Therefore, as the position of the preferred injection gate 31, in the upper joint member 13, the outer surface from the upper end of the upper joint member 13 that is not fitted into the lower joint member 16 to the lower end of the horizontal pipe connection portion 12, or the upper end surface of the upper joint member 13, etc. can be mentioned. In the blade member 19, the position of the lower surface 18b where the drainage of the turning blade 18 does not come into contact can be mentioned, but it is not limited to this. In addition, when the injection gate 31 is provided and a gate mark is provided on either one of the lower end of the upper joint member 13 and the upper end of the ring-shaped member 19a of the blade member 19, by providing a notch for avoiding this gate mark on the other, it becomes possible to provide the injection gate 31 even at the contact portion 47. Also, the upper joint member 13 and the blade member 19 may be integrally molded by injection molding. Even in this case, it is preferable not to provide the injection gate 31 at the portion in contact with the lower joint member 16 (the outer surface below the lower end of the horizontal pipe connection portion 12).

[0044] Similarly, also in the lower joint member 16, at the positions where it contacts the upper joint member 13 and the blade member 19, that is, on the upper inner surface of the lower joint member 16, it is preferable not to provide the injection gate 31. Further, when the vertical pipe connection portion 15 at the lower end of the lower joint member 16 is a socket portion, it is preferable not to provide the injection gate 31 on the outer surface near the lower end of the lower joint member 16. Furthermore, the lower joint member 16 has a shape that extends vertically long so as to penetrate the floor slab 14. If the injection gate 31 is provided on either the upper end surface or the lower end surface of the lower joint member 16, there is a risk that the resin will not spread to the other end. Therefore, it is preferable not to provide the injection gate 31 on the upper end surface or the lower end surface of the lower joint member 16. As a preferable position of the injection gate 31, examples include the tapered outer surface of the lower joint member 16 or the outer surfaces of the two upper and lower cylindrical portions of the lower joint member 16, such as the vicinity of the tapered portion, but it is not limited thereto.

[0045] In particular, as shown in FIG. 4, when there is a thin portion such as the positioning concave groove portion 44 (of the positioning portion 42) in the lower joint member 16, the resin injection gate 31 is provided at a position avoiding the thin portion with respect to the circumferential direction of the lower joint member 16 and at a position where a weld line 49 (see FIG. 4) cannot be formed in the thin portion, at one or a plurality of locations.

[0046] The weld line 49 is a confluence mark of the resin that can be formed at a position away from the resin injection gate 31. As shown in FIGS. 4(a) and 4(b), the position where the weld line 49 cannot be formed can be a position where the circumferential distance from the injection gate 31 to the thin portion is not equal. On the other hand, as shown in FIGS. 4(c) and 4(d), the position where the weld line 49 can be formed is a position where the circumferential distance from the injection gate 31 to the thin portion is equal.

[0047] Note that the positioning rib 43 and the positioning groove portion 44 of the positioning portion 42 shown in FIG. 5 may be provided on either the upper joint member 13 and the blade member 19 that constitute the fitting portion 41 or the lower joint member 16. In this case, the positioning rib 43 is provided on the upper joint member 13 and the blade member 19, and the positioning groove portion 44 is provided on the lower joint member 16.

[0048] Then, the fitting portion 41 where the positioning portion 42 is provided is adhesively fixed with an adhesive. The type of the adhesive is not particularly limited. However, since a slight gap is formed in each part constituting the fitting portion 41 due to a draft angle or the like applied during injection molding, it is more preferable to use a filling-type adhesive than a solvent-based adhesive in order to fill the gap and surely prevent water leakage. As the filling-type adhesive, for example, it is preferable to use an epoxy-based two-component mixed reactive adhesive. Note that for other adhesive parts as well, it is preferable to use the above-described filling-type adhesive to prevent water leakage.

[0049] The corner portion 45 to be formed into the rounded shape portion 46 of the positioning rib 43 and the positioning groove portion 44 for positioning is at least the tip portion of the positioning rib 43 and the inner back portion of the positioning groove portion 44 for positioning. Note that the corner portion 45 at the base of the positioning rib 43 and the entrance portion of the positioning groove portion 44 for positioning may also be formed into the rounded shape portion 46.

[0050] The rounded shape portion 46 is at least provided with a roundness such that the angular shape disappears. The rounded shape portion 46 is formed to have a diameter that allows the adhesive to easily enter according to the adhesive used, so that no gap is formed. Note that instead of the rounded shape portion 46, the cross-sectional shape of the positioning rib 43 may be a tapered shape such that it becomes a polygon, or the cross-sectional shape of the positioning rib 43 may be a trapezoidal shape whose width decreases toward the tip.

[0051] (3) Further, as shown in FIG. 6, at least a vibration damping rib 52 extending in the axial direction 51 (see FIG. 3) is provided on the outer surface of the lower joint member 16.

[0052] Here, the axial direction 51 is the vertical direction when the drain pipe joint 5 is installed. One or several vibration damping ribs 52 are provided so as to extend over substantially the entire axial direction 51 of the lower joint member 16. The vibration damping ribs 52 may be provided at any position in the circumferential direction. For example, as shown in FIG. 6(a), the vibration damping ribs 52 may be provided at positions different from the positioning portion 42 (positioning rib 43 or positioning groove portion 44). Also, as shown in FIG. 6(b), the vibration damping ribs 52 may be provided at the same positions as the positioning portion 42 (positioning rib 43 or positioning groove portion 44). It is preferable that the width of the vibration damping ribs 52 is larger than the width of the positioning groove portion 44 of the positioning portion 42. By doing so, thinning of the lower joint member 16 can be prevented, which is preferable in terms of strength. The vibration damping ribs 52 preferably have a trapezoidal cross-section with the tip side as the upper base and the base side as the lower base for mold release.

[0053] (4) As shown in FIG. 2, an outer fitting portion 61 is provided at the upper end portion of the lower joint member 16 so that the lower end portion of the upper joint member 13 and the upper end portion of the blade member 19 can be fitted in an inserted state. Then, as shown in FIG. 7, the upper edge portion of the outer fitting portion 61 of the lower joint member 16 is embedded in a state of protruding upward from the upper surface of the floor slab 14 (protrusion portion 62).

[0054] Here, as shown in FIG. 6, in the fitting portion 41 described above, the upper joint member 13 and the blade member 19 located on the upper side serve as the inner fitting portion 63, and the lower joint member 16 located on the lower side serves as the outer fitting portion 61. Thereby, a structure that is less likely to cause water leakage can be achieved. Between the upper edge portion (protrusion portion 62) of the outer fitting portion 61 of the lower joint member 16 and the lower end portion of the upper joint member 13, and between the upper edge portion (protrusion portion 62) of the outer fitting portion 61 of the lower joint member 16 and the upper surface of the floor slab 14 (mortar 27), water is stopped by a caulking material 65 or the like.

[0055] As shown in Fig. 1, the vertical pipe 3 and the horizontal pipe 4 are connected using a drain pipe joint 5 having vertical pipe connection parts 11 and 15 at the upper and lower ends, a horizontal pipe connection part 12 on the side surface, and a turning vane 18 inside, as shown in Fig. 7, to form a piping structure 6. And the above horizontal pipe 4 is directly adhesively fixed to the horizontal pipe connection part 12 of the above drain pipe joint 5. Furthermore, an expansion absorption part 71 (see Fig. 8) capable of absorbing the thermal expansion (influence) of the horizontal pipe 4 is provided on the above horizontal pipe 4.

[0056] Here, for the expansion absorption part 71, substantially the same one as the above expansion joint 21 can be used. Specifically, this expansion absorption part 71 is formed by attaching a seal member 73 capable of allowing displacement due to the thermal expansion of the horizontal pipe 4 inside a short cylindrical joint body 72. This seal member 73 has at least a ring-shaped seal body 73a and a lip part 73b integrally protruding inward from the inner peripheral part of this seal body 73a so as to be inclined. A ring-shaped cap part 74 for holding the seal member 73 so that it cannot fall off is attached to the upper end part of the joint body 72.

[0057] Note that the expansion absorption part 71 may be used if the horizontal pipe 4 is 2 m or less, but it is not particularly necessary. When the horizontal pipe 4 is 2 m or more, one or a plurality of them are used.

[0058] <Function> Hereinafter, the function of this embodiment will be briefly described.

[0059] In the drainage facilities of apartment buildings and office buildings, the drainage generated on each floor 2 is collected into the vertical pipe 3 through the horizontal pipe 4 and the drain pipe joint 5, and flows down the vertical pipe 3 and is discharged to the sewer pipe. At this time, by providing the turning vane 18 inside the drain pipe joint 5, a swirling flow can be given to the drainage flowing down the vertical pipe 3. Therefore, inside the vertical pipe 3, a flow of drainage along the inner peripheral surface and a flow of air (air core) along the central part can be formed, so that it is possible to separate and flow drainage and air inside a single vertical pipe 3.

[0060] <Effect>According to this embodiment, the following effects can be obtained.

[0061] (Effect 1) Since minute uneven traces (gate marks) remain at the position of the resin injection gate 31 for molding an injection molded product, it is not preferable to set the injection gate 31 at a functionally important position. Therefore, in the case of the lower joint member 16, the resin injection gate 31 is provided on at least one of the outer peripheral surfaces on the upper end side or the lower end side. Thereby, the injection gate 31 can be provided at a position that has the least influence on the function as the drain pipe joint 5.

[0062] For example, when the injection gate 31 is set at the fitting portion 41 between the lower end portion of the upper joint member 13 and the upper end portion of the blade member 19 and the upper end portion of the lower joint member 16, a gate mark (uneven portion) of the injection gate 31 will exist within the fitting portion 41. Since the uneven portion of this gate mark creates a gap within the fitting portion 41 to form a water passage, there is a possibility of water leakage through this water passage.

[0063] However, by providing the injection gate 31 at a position avoiding the above-described fitting portion 41, unnecessary uneven shapes can be eliminated from the fitting portion 41, the generation of a water passage can be eliminated, and water leakage can be prevented.

[0064] Also, when the injection gate 31 is set inside the lower joint member 16, there is a possibility that dust or the like will get caught on the gate mark (uneven portion). However, by providing the injection gate 31 at a position avoiding the inside of the lower joint member 16, it is possible to prevent catching of dust or the like.

[0065] Also, when there are thin portions such as the positioning portion 42 (the positioning concave groove portion 44 thereof) in the lower joint member 16, the resin injection gate 31 is preferably provided at one or more positions avoiding the thin portion and at a position where a weld line 49 cannot be formed in the circumferential direction of the lower joint member 16. As a result, the injection gate 31 and the weld line 49 cannot be formed in the thin portion, so that the strength of the lower joint member 16 can be increased and cracking of the thin portion can be prevented.

[0066] (Effect 2) The fitting portion 41 between the lower end portion of the upper joint member 13 and the upper end portion of the blade member 19 and the upper end portion of the lower joint member 16 is fixed by adhesion. However, if there are uneven shapes such as the positioning rib 43 and the positioning concave groove portion 44 in the fitting portion 41, it is likely to prevent the adhesive from flowing circumferentially due to the uneven portions. Moreover, if there is a corner portion 45 having a rectangular shape in the positioning rib 43 or the positioning concave groove portion 44, the corner portion 45 having a rectangular shape is the shape in which the adhesive is most difficult to penetrate. Therefore, when the adhesive is applied or injected, poor injection of the adhesive, air accumulation due to poor injection, etc. are likely to occur. If there is a portion where such poor injection or air accumulation occurs, there is a risk that the portion becomes a water passage (water channel) and water leakage occurs.

[0067] Therefore, a rounded portion 46 is provided at the corner portion 45 of the positioning rib 43 and the positioning concave groove portion 44. As a result, the rectangular shape of the corner portion 45 disappears, so that the adhesive easily enters the corner portion 45, and it becomes difficult for poor injection of the adhesive, air accumulation due to poor injection, etc. to occur. Therefore, the generation of a water passage (water channel) can be prevented and water leakage can be prevented.

[0068] At this time, if the lower joint member 16, the upper joint member 13, and the blade member 19 are resin molded products, a slight gap will be generated in the fitting portion 41 due to the draft angle or the like applied during injection molding. However, such a gap may become a water passage (water channel) and cause water leakage. Therefore, by filling such a gap with a filling type adhesive and bonding the fitting portion 41 with the filling type adhesive, the gap can be surely filled with the filling type adhesive, so that the water passage (water channel) can be eliminated and the generation path of water leakage can be eliminated.

[0069] (Effect 3) The drain pipe joint 5 generates vibration due to the fluid flowing inside, and this vibration is transmitted to the building 1 through the floor slab 14 directly in contact with the drain pipe joint 5 and is likely to become noise.

[0070] Therefore, at least on the outer surface of the lower joint member 16, a vibration damping rib 52 extending in the axial direction 51 is provided. Since the lower joint member 16 is a component that occupies a large proportion of the drain pipe joint 5, by providing the vibration damping rib 52 on the lower joint member 16, the rigidity of the entire drain pipe joint 5 can be increased. And since the lower joint member 16 is reinforced by the vibration damping rib 52 and is less likely to vibrate, it is possible to effectively suppress the vibration from being transmitted from the lower joint member 16 directly embedded in the floor slab 14 to the building 1 and becoming noise (improvement of vibration isolation and sound insulation).

[0071] (Effect 4) If the upper edge of the outer fitting portion 61 of the lower joint member 16 is at the same level as or lower than the upper surface of the floor slab 14, it becomes difficult to perform construction to block the gap between the lower joint member 16 and the floor slab 14. Therefore, it becomes difficult to surely block the gap between the lower joint member 16 and the floor slab 14 and prevent the formation of a water passage (water channel).

[0072] Therefore, the upper edge of the externally fitted portion 61 of the lower joint member 16 is made to project upward from the upper surface of the floor slab 14 (a projecting portion 62 is provided and embedded). As a result, it becomes easier to perform construction to surely block the gap between the lower joint member 16 and the floor slab 14, so that the generation of a water passage can be eliminated and water leakage can be prevented.

[0073] (Effect 5) In this piping structure 6, the vertical pipe 3 is connected to the vertical pipe connection portions 11 at the upper and lower ends of the drain pipe joint 5. Further, the horizontal pipe 4 is adhesively fixed to the horizontal pipe connection portion 12 on the side surface of the drain pipe joint 5. And the drainage flowing through the vertical pipe 3 is given a swirling flow by the swirling blades 18 provided inside the drain pipe joint 5. Thereby, an air core (a passage for air) can be formed at the central portion of the vertical pipe 3.

[0074] And by directly adhesively fixing the horizontal pipe 4 to the horizontal pipe connection portion 12 of the drain pipe joint 5, the gap between the horizontal pipe 4 and the horizontal pipe connection portion 12 can be surely blocked, and water leakage can be prevented.

[0075] At this time, by providing the expansion and contraction absorption portion 71 on the horizontal pipe 4, the influence of the thermal expansion and contraction of the horizontal pipe 4 can be absorbed by the expansion and contraction absorption portion 71 provided in the middle or at the end of the horizontal pipe 4.

[0076] And as described above, by making the fine gaps of each part disappear as much as possible, a drain pipe joint 5 and a piping structure 6 in which a gap serving as a water passage disappears and water leakage hardly occurs can be obtained.

[0077] Although the embodiments of the present invention have been described in detail with reference to the drawings, the embodiments are merely examples of the present invention. Therefore, the present invention is not limited only to the configurations of the embodiments, and it goes without saying that the present invention includes design changes and the like within the scope not departing from the gist of the present invention. Further, for example, when a plurality of configurations are included in each embodiment, it goes without saying that possible combinations of these configurations are included even without specific description. Also, when a plurality of examples or modification examples are disclosed as those of the present invention in the embodiments, it goes without saying that possible combinations of configurations spanning these are included even without specific description. Also, regarding the configurations depicted in the drawings, it goes without saying that they are included even without specific description. Furthermore, when there is a term such as "etc.", it is used in the sense of including equivalent ones. Also, when there are terms such as "substantially", "about", "degree", etc., they are used in the sense of including those within the range and accuracy recognized commonly.

Explanation of Reference Numerals

[0078] 1 Building 3 Vertical Pipe 4 Horizontal Pipe 5 Drain Pipe Joint 11 Vertical Pipe Connection Part 12 Horizontal Pipe Connection Part 13 Upper Joint Member 13a Backflow Prevention Rib 14 Floor Slab 15 Vertical Pipe Connection Part 16 Lower Joint Member 18 Swivel Vane 19 Vane Member 21 Expansion Joint 26 Through Hole 31 Injection Gate 41 Fitting Part 42 Positioning Part 43 Positioning Rib 44 Positioning Groove Part 45 Corner Part 46 Rounded Shape Part 51 Axial Direction 52 Vibration Damping Rib 61 Outer Fitting Part 65 Calking material 71 Expansion and contraction absorption part 72 Joint body 73 Sealing member

Claims

1. A drainage pipe joint provided at a connection between a vertical pipe and a horizontal pipe, comprising at least an upper joint member having a vertical pipe connection portion at its upper end and a horizontal pipe connection portion at its side, and a lower joint member having a vertical pipe connection portion at its lower end, and being installed in a through hole provided in a floor slab of a building, The upper joint member and the lower joint member are each formed of a resin injection-molded product, An outer fitting portion is provided on an upper end portion of the lower joint member into which a lower end portion of the upper joint member can be fitted in an inserted state, A drainage pipe joint, characterized in that the upper edge of the outer fitting portion of the lower joint member is buried in a state protruding above the upper surface of the floor slab.

2. A drainage pipe joint provided at a connection between a vertical pipe and a horizontal pipe, comprising at least an upper joint member having a vertical pipe connection portion at its upper end and a horizontal pipe connection portion at its side, and a lower joint member having a vertical pipe connection portion at its lower end, and being installed in a through hole provided in a floor slab of a building, The upper joint member and the lower joint member are each formed of a resin injection-molded product, An outer fitting portion is provided on an upper end portion of the lower joint member into which a lower end portion of the upper joint member can be fitted in an inserted state, A swirl vane is provided inside the lower joint member, A drainage pipe joint, characterized in that the swirl vane is formed from a polyvinyl chloride resin mixed or copolymerized with an impact-modified resin.

3. A drainage pipe joint provided at a connection between a vertical pipe and a horizontal pipe, the upper joint member having at least a vertical pipe connection portion at its upper end and a horizontal pipe connection portion at its side, and a lower joint member having a vertical pipe connection portion at its lower end, the drainage pipe joint being installed in a through hole provided in a floor slab of a building, The upper joint member has an expansion joint at the vertical pipe connection portion at the upper end thereof, The expansion joint includes a joint body, a seal member provided inside the joint body, and a swirl vane provided at a lower part of the joint body, a gate mark resulting from a resin injection gate is provided on an outer surface of the upper joint member in a range from an upper end of the upper joint member to a lower end of the horizontal pipe connection portion; A drain pipe joint, characterized in that the lower joint member is provided at its upper end with an external fitting portion into which the lower end of the upper joint member can be inserted and fitted.

4. The drain pipe joint according to any one of claims 1 to 3, A drainage pipe joint, characterized in that an expansion joint having a sealing member therein is attached to the horizontal pipe connection portion.

5. The drain pipe joint according to any one of claims 1 to 3, A drain pipe joint, characterized in that the lower joint member has a vibration-damping rib on its outer surface along the axial direction of the lower joint member.

6. The drain pipe joint according to any one of claims 1 to 3, A backflow prevention rib extending in the vertical direction is provided inside the upper joint member, A drain pipe fitting, characterized in that when the lower end of the upper fitting member is connected to the upper end of the lower fitting member, the lower end of the backflow prevention rib is higher than the upper end of the lower fitting member.

7. The drain pipe joint according to any one of claims 1 to 3, A drainage pipe joint, characterized in that the lower joint member is provided with a fire-resistant thermally expandable resin pipe.

8. A piping structure comprising: a drain pipe joint according to any one of claims 1 to 3; a vertical pipe connected to the vertical pipe connection portion; and a horizontal pipe connected to the horizontal pipe connection portion.

9. A building comprising a floor slab on which the drain pipe joint according to claim 1 is installed, A building characterized in that a caulking material is provided between the upper surface of the floor slab and the upper edge of the outer fitting portion of the lower joint member.

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