Drainage pipe joint

Abstract

To sufficiently exhibit fire resistance performance in a drain piping joint.SOLUTION: The drain pipe joint 100 is formed of one or a plurality of resin injection molded products, and includes a pipe body 110 disposed in a through-hole of a floor slab S and including a straight pipe portion 116 and a reduced diameter portion 118 when installed in a building, an upper riser pipe connecting portion 120 for connecting a drain riser pipe 520, a drain pipe connecting portion 130 for connecting the drain riser pipe 530, and a horizontal branch pipe connecting portion 140 for connecting a drain horizontal branch pipe 510, wherein an outer layer member 700 is wound around an outer periphery of the pipe body 110. A thermally expandable fire-resistant sheet 712 is provided on the outer peripheral surface of the straight pipe part 116, and a thermally expandable fire-resistant material 612 is provided in a recess 112 provided on the outer peripheral surface of the reduced diameter part 118.SELECTED DRAWING: Figure 5

Description

[Technical Field]

[0001] The present invention relates to a drainage pipe joint that is installed through a floor slab of a building, and more particularly to a drainage pipe joint that can exhibit optimal fire spread prevention effects. [Background technology]

[0002] Water supply and drainage systems are installed in apartment buildings, office buildings, etc. The most widely known drainage system is a drainage piping structure that includes vertical pipes that run vertically through each floor of the building, horizontal pipes installed within each floor, and drainage pipe fittings that connect these. When installed in a building, such a drainage pipe joint includes a pipe body that is placed in the through-hole in the floor slab, an upper riser pipe connection that protrudes above the floor slab and connects to a drainage standpipe that allows drainage water from the upper floor to flow in, a lower riser pipe connection that protrudes below the floor slab and connects to a drainage standpipe that allows drainage water to flow down to the floor below, and a horizontal branch pipe connection that connects to a horizontal drainage branch pipe above the floor slab. Furthermore, many of the pipe bodies include components that change the flow of drainage water within the drainage pipe joint (e.g., swirl vanes, deflector plates, etc.). Such drainage pipe joints are widely known to be made from one or more injection-molded resin products.

[0003] In buildings equipped with drainage piping structures using such drainage pipe joints, in the event of a fire or other incident on a floor below, in order to prevent flames, soot, and toxic gases from leaking to upper floors through burned or melted parts of the drainage piping structure, heat-expandable fire-resistant material is attached to the drainage pipe joints separately around the periphery of the piping material or buried within the wall of the piping material, and in the event of a fire, the through holes in the floor slab are kept blocked by this heat-expandable fire-resistant material.

[0004] As an example of such technology, Japanese Patent No. 6576711 (Patent Document 1) discloses a drainage pipe fitting that is piped by penetrating the floor slab of a building, and that comprises a fitting body to which a drainage pipe is connected, and a first covering material that covers the outer surface of the portion of the fitting body that penetrates the floor slab, wherein the fitting body is made of a thermoplastic resin, and the first covering material is integrally provided with, arranged in this order from the inside, a first sound-absorbing layer made of a sponge material, a second sound-absorbing layer made of an aggregate of inorganic fibers, and a waterproof and sound-insulating surface layer, and a thermal expansion material that is sandwiched between the first sound-absorbing layer and the second sound-absorbing layer and is provided in at least one ring shape around the fitting body. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Patent No. 6576711 Summary of the Invention [Problem to be solved by the invention]

[0006] In the drainage joint disclosed in the above-mentioned Patent Document 1, The outer surface of the part of the joint body that penetrates the floor slab is covered with the first covering material, and the outer surface of the part that protrudes from the top surface of the floor slab is covered with the second covering material. (1) The first covering material is composed of The first sound-absorbing layer is made of sponge material (urethane foam) A thermal expansion material sandwiched between the first and second sound-absorbing layers - Second sound-absorbing layer made of inorganic fiber aggregate (glass wool) Waterproof and soundproof surface layer (aluminum glass cloth) (2) The second covering material is composed of the following materials from the inside: Upper sound-absorbing layer (felt) made of sound-absorbing material Upper sound insulation layer made of sound-insulating material (butyl rubber) The structure is disclosed.

[0007] However, in the structure disclosed in Patent Document 1, the prior art document only discloses that the thermal expansion material is arranged in a ring shape around the large-diameter straight pipe section of the joint body, that the thermal expansion material is sandwiched between the first sound-absorbing layer and the second sound-absorbing layer, and that the thermal expansion material contained in the first covering material is backfilled with mortar, and it cannot be said that this is capable of achieving optimal fire spread prevention effects.

[0008] The present invention was developed in consideration of the above-mentioned problems, and its purpose is to provide a drainage pipe joint that is installed through the floor slab of a building and that can exhibit optimal fire spread prevention effects. [Means for solving the problem]

[0009] In order to achieve the above object, the drainage pipe joint according to the present invention employs the following technical means. In other words, the drainage pipe fitting of the present invention is formed from one or more injection-molded resin products, and when installed in a building, is a drainage pipe fitting comprising: a pipe body that is placed in a through hole in the floor slab; an upper riser pipe connection portion that protrudes above the floor slab and connects a drainage riser pipe to allow drainage water to flow in from the upper floor; a drainage pipe connection portion that protrudes below the floor slab and connects a drainage pipe to allow drainage water to flow out to the lower floor; and a horizontal branch pipe connection portion that connects a horizontal drainage branch pipe above the floor slab, and is characterized in that it is provided with two types of heat-expandable fire-resistant materials with different thermal expansion coefficients.

[0010] Preferably, the two types of heat-expandable fire-resistant materials are provided at different radial positions in the drainage pipe fitting, and the heat-expandable fire-resistant material provided on the inner layer side can be configured to have a higher thermal expansion coefficient than the heat-expandable fire-resistant material provided on the outer layer side. More preferably, the two types of heat-expandable fire-resistant materials are provided at different positions in the vertical direction of the drainage pipe joint, and the heat-expandable fire-resistant material provided on the upper side and the heat-expandable fire-resistant material provided on the lower side can be configured so that the thermal expansion coefficients are different.

[0011] More preferably, the pipe body can be configured to have at least a straight pipe section and a reduced diameter section below the straight pipe section, and two types of heat-expandable fire-resistant material can be provided at different radial positions within the height range of the straight pipe section. More preferably, the pipe body can be configured to have at least a straight pipe section and a reduced diameter section below the straight pipe section, and the straight pipe section and the reduced diameter section can be respectively provided with two types of heat-expandable fire-resistant materials with different thermal expansion coefficients.

[0012] More preferably, the two types of thermally expandable fire-resistant materials can be configured to have overlapping portions. More preferably, at least one of the two types of thermally expandable fire-resistant materials can be configured to be provided at a position corresponding to the floor slab. More preferably, the heat-expandable fire-resistant material can be configured to be provided in either a sheet-like annular form that is arranged in a ring shape around the straight pipe section of the drainage pipe joint, or a putty-like filled form that is filled into a recess of the drainage pipe joint.

[0013] More preferably, the sheet-like heat-expandable fire-resistant material provided in the annular form and the putty-like heat-expandable fire-resistant material provided in the filled form can be configured to exhibit vibration-damping properties. [Effects of the Invention]

[0014] According to the present invention, it is possible to provide a drainage pipe joint that is installed by penetrating the floor slab of a building and that can exhibit an optimal fire spread prevention effect. [Brief explanation of the drawings]

[0015] [Figure 1] 1A and 1B are a top view and a side view, respectively, showing a drainage piping structure in which a drainage pipe joint 100 according to a first embodiment of the present invention is adopted. [Figure 2]2A and 2B are diagrams showing the drainage piping structure of FIG. 1, in which (A) is an oblique view showing the state after an outer layer member 700 has been provided on the drainage pipe fitting 100, and (B) is an oblique view showing the state before the outer layer member 700 has been provided on the drainage pipe fitting 100. [Figure 3] 1A and 1B are diagrams showing a drainage pipe fitting 100, in which (A) is an oblique view showing the state after a heat-expandable fire-resistant material 612 and a heat-expandable fire-resistant sheet 712 have been installed, and (B) is an oblique view showing the state before the heat-expandable fire-resistant material 612 and a heat-expandable fire-resistant sheet 712 have been installed. [Figure 4] FIG. 4(A) is an exploded view of the drainage pipe joint 100 shown in FIG. 3(B), and FIG. 4(B) is a perspective view of the pipe body 110 seen through the pipe wall. [Figure 5] 5 is a cross-sectional view taken along line 5-5 of FIG. 1, showing a drainage piping structure in which the drainage piping joint 100 is used. [Figure 6] FIG. 6 is a partially enlarged cross-sectional view of FIG. 5 (without recessed cross-section). [Figure 7] FIG. 6 is a partially enlarged cross-sectional view of FIG. 5 (with a recessed cross-section). [Figure 8] (A) is a developed view of rock wool, which is an example of a vibration insulator 720 (formed from fire-resistant inorganic fibers) that forms the three-layered outer layer member 700 shown in Figure 5, and (B) is a developed view of rock wool, which is an example of a vibration insulator 726, which is a comparative example. [Figure 9] 10A and 10B are a top view and a side view, respectively, showing a drainage piping structure in which a drainage pipe joint 200 according to a second embodiment of the present invention is adopted. [Figure 10] 9A and 9B are diagrams showing the drainage piping structure, in which (A) is an oblique view showing the state after an outer layer member 800 has been provided on the drainage pipe fitting 200, and (B) is an oblique view showing the state before the outer layer member 800 has been provided on the drainage pipe fitting 200. [Figure 11] 1A and 1B are diagrams showing a drainage pipe fitting 200, in which (A) is an oblique view showing the state after a heat-expandable fire-resistant material 612 and a heat-expandable fire-resistant sheet 712 have been installed, and (B) is an oblique view showing the state before the heat-expandable fire-resistant material 612 and a heat-expandable fire-resistant sheet 712 have been installed. [Figure 12](A) An exploded view of the drainage pipe fitting 200 shown in Figure 11(B), (B) a cross-sectional view of the pipe body 210, and (C) a cross-sectional view of the pipe body 210 to explain the recess 212 filled with thermally expandable fire-resistant material 612. [Figure 13] 13 is a cross-sectional view taken along line 13-13 in FIG. 1, showing a drainage piping structure in which the drainage piping joint 200 is used. [Figure 14] FIG. 14 is a partially enlarged cross-sectional view of FIG. 13. [Figure 15] 4A to 4E are diagrams illustrating the arrangement of the thermally expandable fire-resistant material. DETAILED DESCRIPTION OF THE INVENTION

[0016] A drainage pipe fitting 100 according to a first embodiment of the present invention will be described in detail below with reference to FIGS. 1 to 8, and a drainage pipe fitting 200 according to a second embodiment of the present invention will be described in detail with reference to FIGS. 9 to 15, including their construction methods. The perspective views shown in FIGS. 2 to 4 and 10 to 12 are schematic and may not be completely consistent with other drawings (e.g., FIGS. 5 and 13) (e.g., the presence or absence of a drain pipe connected to the drainage pipe fitting 100 or 200, the presence or absence of a vibration-damping material 714 provided outside the receptacle portion of the upper riser pipe connection portion 120 and outside the receptacle portion of the horizontal branch pipe connection portion 140, and the shape of the swirl vane 114). In addition, in the following description, the outer peripheral surface, the outer surface, the outer side, the outer peripheral side, and the inner layer side, the inner peripheral side, and the inner side may not be clearly distinguished from one another.

[0017] <Summary> As shown in Figures 1 and 5 and Figures 9 and 13, a drainage piping structure using a drainage pipe fitting 100 or a drainage pipe fitting 200 according to an embodiment of the present invention includes a drainage pipe fitting 100 or a drainage pipe fitting 200 installed in a through hole that passes vertically through a floor slab S in a building, a drainage riser pipe 520 on the upper floor side that is connected to the drainage pipe fittings 100 or the drainage pipe fittings 200 above the floor slab S and allows drainage water to flow in from the upper floor, horizontal drainage branch pipes 510 (three of each in this case) that are connected to the drainage pipe fittings 100 or the drainage pipe fittings 200 above the floor slab S, and a drainage riser pipe 530 or a 90-degree bent pipe 540 on the lower floor side that is connected to the drainage pipe fittings 100 or the drainage pipe fittings 200 below the floor slab S and allows drainage water to flow out to the lower floor. The drainage piping structure using the drainage pipe joint 100 is used on floors other than the lowest floor, and the drainage piping structure using the drainage pipe joint 200 is used on the lowest floor, but these drainage piping structures have the same structure above the floor slab S. Note that these drainage piping structures are merely examples, and the use of the drainage pipe joint according to the present invention is not limited to the drainage piping structures shown as examples.

[0018] Here, the drain pipe fitting 100 or drain pipe fitting 200 used in these drain pipe structures and the drain pipe connected to these drain pipe fittings are made of non-fire-resistant resin. However, the drain pipe fittings of the present invention may be limited to such non-fire-resistant resins or may be made of materials other than resin, such as cast iron. For this reason, the following description will assume that the drain pipe fitting 100, drain pipe fitting 200, and the drain pipe connected to these drain pipe fittings are made of non-fire-resistant resins, and cases where they are not limited to resin will be noted as appropriate in the description. Here, "non-fire-resistant" refers to a property that allows deformation, melting, or combustion due to the heat generated when a fire occurs in a building, and this applies to materials made of resin, for example. When resin is used, the drainage pipe joint 100, the drainage pipe joint 200, and the pipes connected thereto (the drainage horizontal branch pipe 510, the upper floor drainage standpipe 520, the lower floor drainage standpipe 530, and the 90-degree bent pipe 540) are formed from, for example, polyvinyl chloride, polyethylene, polybutene, polypropylene, nylon, etc. The drainage standpipe may be made of, for example, a so-called two-layer fire-resistant pipe.

[0019] The drainage pipe fitting 100 is formed from one or more (here, seven as an example) injection-molded resin products, as shown in Figures 4(A) and 5, and the drainage pipe fitting 200 is formed from one or more (here, seven as an example) injection-molded resin products, as shown in Figures 12(A) and 13. As shown in Figures 1, 4(A) and 5, the drainage pipe fitting 100 comprises a pipe main body 110 that is placed in the through-hole of the floor slab S when installed in a building, an upper riser pipe connecting part 120 that protrudes above the floor slab S and connects a drainage standpipe 520 that allows drainage water from the upper floor to flow in, a drainage pipe connecting part 130 that protrudes below the floor slab S and connects a drainage pipe (here, drainage standpipe 530) that flows out drainage water to the lower floor, and a horizontal branch pipe connecting part 140 that connects a horizontal drainage branch pipe 510 above the floor slab S. 9, 12(A), and 13, the drainage pipe fitting 200 includes a pipe main body 210 that is placed in the through-hole of the floor slab S when installed in a building, an upper riser pipe connection portion 120 that connects a drainage riser pipe 520 that protrudes above the floor slab S and allows drainage water from the upper floor to flow in, a drainage pipe connection portion 230 that connects a drainage pipe (here, a 90-degree bent pipe 540 suspended from the lower floor side of the floor slab S by a mounting member T) that protrudes below the floor slab S and allows drainage water to flow out to the lower floor, and a horizontal branch pipe connection portion 140 that connects a drainage horizontal branch pipe 510 above the floor slab S. Thus, the drainage pipe fitting 100 and the drainage pipe fitting 200 differ in the pipe main body 110 and the pipe main body 210, in the drainage pipe connection portion 130 and the drainage pipe connection portion 230, and in the outer layer member 700 and the outer layer member 800 (described later). That is, the drain pipe joint 100 and the drain pipe joint 200 have common parts above the floor slab S. The common parts of the drain pipe joint 100 and the drain pipe joint 200 are given the same reference numerals.

[0020] As shown in these figures, the common part of drainage pipe fitting 100 and drainage pipe fitting 200 is horizontal branch pipe connecting section 140, which is composed of a water collection chamber 142 with three openings spaced 90° apart in a plan view, and a first horizontal branch pipe connecting member 144, a second horizontal branch pipe connecting member 146, and a third horizontal branch pipe connecting member 148 for connecting the drainage horizontal branch pipe corresponding to the positions of the openings. Here, although not limited thereto, first horizontal branch pipe connecting member 144, second horizontal branch pipe connecting member 146, and third horizontal branch pipe connecting member 148 all connect drainage horizontal branch pipe 510 without reducing the diameter or the like, but the pipe diameter may be variable.

[0021] The pipe body 110 included in the drain pipe joint 100 and the pipe body 210 included in the drain pipe joint 200 differ in the following respects: The pipe body 210 is shorter in the drainage direction than the pipe body 110, does not have the tapered diameter portion 118 included in the pipe body 110, and does not have swirl vanes 114 as protrusions that protrude from the inner surface of the pipe body 110 between the horizontal branch pipe connecting portion 140 and the drain pipe connecting portion 130. A depression 112 corresponding to this protrusion (here, the swirl vanes 114) is formed on the outer surface of the pipe body 110, and a putty-like heat-expandable fire-resistant material 612 is filled in this depression 112 as shown in FIG. 3. On the other hand, the pipe body 210 has a recess 212 instead of the recess 112 that the pipe body 110 has, and as shown in FIG. 11, this recess 212 is filled with a putty-like thermally expandable fireproof material 612.

[0022] Here, the thermally expandable fire-resistant material 612 filled in the recess 112 or the recess 212 will be described. The thermally expandable fire-resistant material 612 is formed, for example, from a resin composition containing a resin mainly composed of butyl rubber, a phosphorus compound, neutralized thermally expandable graphite, a hydrated inorganic material, and a metal carbonate, or a resin composition containing an epoxy resin, a phosphorus compound, neutralized thermally expandable graphite, and an inorganic filler. For example, the thermally expandable fire-resistant material 612 is manufactured by Sekisui Chemical Co., Ltd. under the trade name "Fi-Block" (expands 5 to 40 times at a reaction temperature of 200°C). Other thermally expandable fire-resistant materials that can be used include "Thermal Expandable Heat-Resistant Sealant IP" manufactured by Inaba Electric Industry Co., Ltd. (expands starting at 120°C and expands to 4 times or more in volume) and "Heatmel" manufactured by Furukawa Techno Material Co., Ltd. (expansion starting temperature 120°C, significant expansion temperature 260°C, expands 4 to 8 times).

[0023] The thermally expandable fire-resistant material 612 is not limited to the above, and a wide variety of materials with different reaction temperatures and expansion rates can be used. Therefore, the most suitable material that meets the various conditions such as the reaction temperature and pipe diameter required depending on the installation location within the building can be selected and used. This heat-expandable fire-resistant material 612 is formed into a non-hardening, non-drying putty-like material, and is filled into the depression 112 on the outer surface of the pipe body 110 of the drainage pipe fitting 100 or the depression 212 on the outer surface of the pipe body 210 of the drainage pipe fitting 200 so that it is filled up to about the outer diameter of the pipe body 110 or the pipe body 210 (in an amount sufficient to achieve the desired fire resistance, either together with the heat-expandable fire-resistant sheet 712 described below or without the heat-expandable fire-resistant sheet 712).

[0024] Here, the protrusions on the pipe body 110 are not limited to swirl vanes 114, but may be deflector vanes or the like, as long as they change the flow of wastewater within the drain pipe fitting 100. As long as a corresponding depression 112 is formed on the outer surface of the pipe body 110, the protrusions are not limited to swirl vanes or deflector vanes. Furthermore, the depressions 212 on the pipe body 210 are not limited to the shape shown in the figures. In both the drain pipe fittings 100 and 200, the thermally expandable fire-resistant material 612 fills the depressions on the outer surface of these drain pipe fittings. As shown in FIG. 12(B), the depressions on the pipe body 210 are formed as the diameter of the pipe body 210 is reduced. However, since the inner wall of the pipe body 210 widens downstream of the depressions, the depressions are not described as having a reduced diameter portion (tapered portion) to distinguish them from the reduced diameter portion 118 on the pipe body 110.

[0025] Furthermore, a sheet-like heat-expandable fire-resistant sheet 712 is provided so as to be wrapped around the outer peripheral surface of the pipe body 110 at a height position corresponding to the floor slab S of the pipe body 110 as shown in Figures 3 and 5, and a sheet-like heat-expandable fire-resistant sheet 712 is provided so as to be wrapped around the outer peripheral surface of the pipe body 110 at a height position corresponding to the floor slab S of the pipe body 210 as shown in Figures 11 and 13. These heat-expandable fire-resistant materials 612 and heat-expandable fire-resistant sheets 712 are spaced apart in the vertical direction in the pipe body 110, but in the pipe body 210, they have portions that overlap each other in the radial direction without being spaced apart in the vertical direction. Note that the dashed dotted lines in Figures 3 and 11 indicate removal.

[0026] In a building employing such a drainage piping structure, if the drainage pipe joint 100 or the drainage pipe joint 200 or the like catches fire, the heat causes the thermally expandable fire-resistant material 612 and the thermally expandable fire-resistant sheet 712 to expand radially inward, causing the main body of the drainage pipe joint 100 or the drainage pipe joint 200 to crush the hollow portion and close off the drainage pipe joint 100 or the drainage pipe joint 200. As a result, a drainage piping structure using the drainage pipe joint 100 or the drainage pipe joint 200 can shut off the pipeline to prevent the flow of flames, smoke, etc. in the event of a fire.

[0027] Here, as mentioned above, such heat-expandable refractory materials (heat-expandable fire-resistant material 612, heat-expandable fire-resistant sheet 712) are limited to those made of resin, and as will be described later, if the heat-expandable fire-resistant sheet 712 of such heat-expandable refractory materials cannot be provided (in this part regardless of the reason), it is preferable to provide vibration-damping material 714 instead of the heat-expandable fire-resistant sheet 712. Referring to Figures 5 to 7 for the drainage pipe fitting 100, and to Figures 13 to 14 for the drainage pipe fitting 200, we will explain the outer layer member 700 and the outer layer member 800, which are arranged to be wrapped around the outer periphery of the pipe main body 110 or the outer periphery of the pipe main body 210 and the drainage pipe connection portion 230.

[0028] As shown in these figures, outer layer member 700 and outer layer member 800 have a three-layer structure, and are provided in this order from the outer surface of drain pipe fitting 100 or drain pipe fitting 200: vibration damping material 714 (or heat-expandable fire-resistant sheet 712), vibration insulator 720 or vibration insulator 820 made of fire-resistant inorganic fiber, and sound-insulating cover 730, on the outer surface of pipe main body 110 or the outer surface of pipe main body 210 and drain pipe connecting part 230. Vibration insulator 720 and vibration insulator 820 have different shapes when unfolded, as will be described in more detail below. The recess 112 or recess 212 is filled with a heat-expandable fire-resistant material 612, which provides fire resistance (fire spread prevention function), and also provides vibration damping and sound insulation performance because the hollow portion of the recess 112 or recess 212 is filled with the putty-like heat-expandable fire-resistant material 612.

[0029] In the drain pipe fitting 100, the vibration-damping material 714 is attached to the outer surface of the pipe body 110 (over the entire surface, for example, with an adhesive or pressure-sensitive adhesive) so as to cover the heat-expandable fire-resistant material 612 filled in the recess 112. In terms of fire resistance, a heat-expandable fire-resistant sheet 712 is attached to the outer surface of the pipe body 110, instead of the vibration-damping material 714, at a position on the pipe body 110 above the portion of the recess 112 filled with the heat-expandable fire-resistant material 612. The heat-expandable fire-resistant sheet 712 attached to the outer surface of the pipe body 110 in this manner also exhibits vibration-damping performance similar to the vibration-damping material 714 (although the performance may not be equivalent). In the drain pipe fitting 200, the vibration-damping material 714 is attached to the outer surface of the drain pipe connection part 230 (for example, with an adhesive or pressure-sensitive adhesive). Regarding fire resistance, a heat-expandable fire-resistant sheet 712 is attached to the outer surface of the pipe body 210 in place of the vibration-damping material 714 at a position on the pipe body 210 above the drain pipe connection part 230 (and further, a heat-expandable fire-resistant material 612 is filled in the depression 212 on the radially inner circumferential side thereof). The heat-expandable fire-resistant sheet 712 attached to the outer surface of the pipe body 210 in this way also exhibits vibration-damping performance similar to the vibration-damping material 714 (although the performance may not be equivalent).

[0030] As will be described in more detail below, the thermally expandable fire-resistant material 612 and the thermally expandable fire-resistant sheet 712 have different thermal expansion coefficients. Generally, a thermally expandable fire-resistant material with a high thermal expansion coefficient has poor shape retention after expansion, while a thermally expandable fire-resistant material with a low thermal expansion coefficient has good shape retention after expansion. A low thermal expansion coefficient may not provide sufficient fire resistance, while a low shape retention may cause the thermally expandable material to fall off. Taking into account this trade-off characteristic and the thermal expansion coefficients (and the absolute value of the difference between them), the thermally expandable materials contained in the thermally expandable fire-resistant material 612 and the thermally expandable fire-resistant sheet 712 are selected according to their respective positions, weights, shapes, reaction speeds, and expansion start temperatures.

[0031] Thus, the innermost layer 710 in this three-layer structure is either a thermally expandable fireproof sheet 712 or a vibration-damping material 714 . The vibration-damping material 714 is formed containing a butyl-based material (butyl rubber, etc.) or an asphalt-based material (rubber asphalt, modified asphalt, etc.), the sound-insulating cover 730 is formed containing a rubber-based material (EPDM (ethylene propylene diene rubber), etc.), an elastomer-based material, or an olefin-based material (polyethylene resin, etc.), and the vibration insulators 720 and 820, which are formed from fire-resistant inorganic fibers, consist of an aggregate (porous material) of fire-resistant inorganic fibers.

[0032] Here, examples of inorganic fibers include artificial mineral fibers, such as glass wool, rock wool, or ceramic fiber, which are preferred for their high vibration insulation and sound absorption properties. Vibrations caused by wastewater flowing down the pipe body 110 or 210 and the drain pipe connection portion 230 (e.g., vibrations generated by hitting the swirl vane 114) are suppressed by the vibration-damping material 714, and then vibration is blocked (and / or noise associated with the vibrations) by the vibration insulator 720 made of rock wool or the like, and further, the transmission of noise associated with the vibrations is blocked by the sound-insulating cover 730 made of a rubber cover such as EPDM. Here, rock wool is a general term for materials made primarily from natural rock or steel slag such as blast furnace slag, while glass wool is a general term for cotton-like materials composed of glass fiber. Both are fire-resistant and flame-resistant.

[0033] In the following, we may explain the case where butyl rubber is used as the vibration damping material 714, rock wool is used as the vibration insulator 720, and an EPDM rubber cover is used as the sound-insulating cover 730, but these materials are merely examples. When rock wool is used as the vibration isolator 720, it is preferable to use sheet-shaped rock wool manufactured by papermaking. However, it is difficult to process such a rock wool sheet manufactured by papermaking into the three-dimensional shape (straight pipe section + tapered diameter section) of the pipe body 110 of the drainage pipe joint 100 by sewing or the like, and even if a planar rock wool sheet (hereinafter sometimes simply referred to as rock wool, but in this case, a sheet-shaped vibration isolator 720 of the present invention is preferably in the form of a sheet) without sewing or the like is attached to the pipe body 110 by, for example, taping, it may fall off in the event of a fire. For this reason, the unfolded shape (planar shape) of the rock wool sheet is designed to be, for example, as shown in FIG. 8(A).

[0034] In this way, even if the floor slab S is thin, the slits can be made to appear in only one place in the vertical direction (the vertical direction of the pipe body 110). Furthermore, the development of the rock wool sheet shown in Figure 8(B) is also similar in that the slits appear in only one place in the vertical direction, but in order to accommodate the three-dimensional shape of the pipe body 110 (straight pipe section + tapered section), in Figure 8(A) slits (five slits, which are narrow grooves 722 described later) are made in the rock wool sheet at the position of the floor slab S, while in Figure 8(B) a rectangle and a partial ring are joined by an arc. In the development shown in Figure 8(A), the slit is at the position of the floor slab S, so even if there is a slit in this part (this part may be mechanically weak or have poor fire resistance), the slab S is located at the position of the floor slab S, and the floor slab S does not burn, so there is no problem with the fire resistance of the rock wool and it will not fall off in the event of a fire. In contrast, even if the joint indicated by the dotted line in the developed view of the rock wool sheet shown in Figure 8(B) is not located at the floor slab S, or even if it is located at the floor slab S, the joint may break at the joint and cause the rock wool sheet to fall in the event of a fire due to the short length of the joint and the heavy weight of the partial annular part joined below. The shape of the vibration isolator 720 and the effects based on this shape will be described in detail later. Furthermore, with regard to the vibration isolator 820, since the pipe main body 210 and the drain pipe connection part 230 to which the vibration isolator 820 is attached in the drain pipe joint 200 have a substantially straight pipe shape and do not have a three-dimensional shape (straight pipe part + tapered part) like the pipe main body 110, it is not necessary to use the rock wool sheet in the developed shape shown in Figure 8(A) described above, but it is also acceptable to use it.

[0035] Furthermore, in order to suppress noise propagation due to resonance with the inner layer vibration-damping material 714 or thermally expandable fire-resistant sheet 712, vibration insulator 720 using rock wool is provided loosely and fixed at several points around the circumference rather than all the way around. In particular, the height positions at which the rock wool is fixed (more specifically, the rock wool is fixed to the EPDM rubber cover serving as sound-insulating cover 730) are higher than the thermal expansion material (thermally expandable fire-resistant material 612 and thermally expandable fire-resistant sheet 712), preventing the rock wool from falling in the event of a fire. Examples of attachment methods that prevent the rock wool from falling include bonding with adhesive, double-sided tape, etc.

[0036] Below, we will explain the manufacturing method (not the construction method) of the drainage pipe fitting 100 having this three-layer outer layer member 700 or the drainage pipe fitting 200 having the outer layer member 800, and the installation procedure for the outer layer member 700 or the outer layer member 800. First, the recess 112 or the recess 212 is filled with a putty-like heat-expandable fire-resistant material 612. Then, a heat-expandable fire-resistant sheet 712 is attached. In the drain pipe joint 100, the heat-expandable fire-resistant sheet 712 is separated from the putty-like heat-expandable fire-resistant material 612, but in the drain pipe joint 200, the heat-expandable fire-resistant sheet 712 is attached so as to cover all or part of the putty-like heat-expandable fire-resistant material 612. Furthermore, a vibration-damping material 714 is attached to the outer peripheral surface of the pipe main body 110 or the drain pipe connecting part 230 with an adhesive or pressure-sensitive adhesive. At this time, the innermost layer 710 of this three-layer structure is either the heat-expandable fire-resistant sheet 712 or the vibration-damping material 714. Although not layered, in these drainage pipe fittings 100 and 200, there is a heat-expandable fire-resistant material 612 filled in the recess 112 or the recess 212 further inner than the heat-expandable fire-resistant sheet 712.

[0037] After the thermally expandable fire-resistant sheet 712 and the vibration-damping material 714 are provided, a rock wool sheet (shown in a developed view in FIG. 8(A)) serving as a vibration insulator 720 or a rock wool sheet (not shown in a developed view but rectangular) serving as a vibration insulator 820 is wrapped around the sheet. This is then covered with an EPDM rubber cover serving as a sound-insulating cover 730. The EPDM rubber cover serving as the sound-insulating cover 730 exhibits water-stopping properties, sound insulation, and vibration insulation properties. The EPDM rubber cover serving as the sound-insulating cover 730 may be integrally molded and bonded to the drainage pipe joint 100 or the drainage pipe joint 200 to exhibit water-stopping properties, or may not be bonded and exhibit water-stopping properties solely through tension (due to the elasticity of the rubber). In this case, as shown in the cross-sectional shapes in Figures 5 to 7 or Figures 13 to 14, it is also preferable to provide a thick, annular upper end water-stopping portion 732 at the upper end of the EPDM rubber cover serving as this sound-insulating cover 730 and / or a thick, annular lower end water-stopping portion 734 (although with a different diameter) at the lower end to enhance water-stopping properties.

[0038] The drainage pipe joint 100 or the drainage pipe joint 200, the outline of which has been explained above, is formed from one or more resin injection-molded products, is installed to penetrate the floor slab S of a building, and can fully demonstrate fire resistance and suppress drainage vibration. In particular, in the three-layered outer layer member 700 or outer layer member 800, a vibration-damping material 714, for example, butyl rubber, is installed as the innermost layer 710 in close contact with the outer surface of the pipe main body 110 or the outer surface of the pipe main body 210 and the drainage pipe connection part 230, to suppress vibration extremely effectively, a vibration isolator 720, for example, a rock wool sheet, or a vibration isolator 820 (having a different expanded shape from the vibration isolator 720), is installed as the intermediate layer and loosely fixed at several points to exhibit sound absorption, fire resistance, sound insulation, and vibration insulation properties, and In addition, sound-insulating cover 730, an example of which is an EPDM rubber cover, is provided to exhibit water-stopping, sound-insulating, and vibration-insulating properties, and vibrations caused by wastewater flowing down pipe main body 110 or pipe main body 210 and drain pipe connection part 230 (for example, generated by hitting swirl vane 114) are suppressed by vibration-damping material 714, and then vibration is further blocked by vibration isolator 720 or vibration isolator 820, and further noise caused by vibration is blocked by sound-insulating cover 730, so that drainage vibrations can be suppressed extremely effectively. In addition, two heat-expandable fire-resistant materials (heat-expandable fire-resistant material 612 and heat-expandable fire-resistant sheet 712) are provided and are configured to be covered on the outside with multiple layers including a layer that exhibits fire-resistant performance, so that fire-resistant performance can be fully exhibited.

[0039] Next, the drain pipe joint 100 or the drain pipe joint 200 will be described in more detail below. As with the overview above, the drain pipe joint 100 will be described with reference to Figures 1 to 8, and the drain pipe joint 200 with reference to Figures 9 to 15. Furthermore, configurations common to the drain pipe joint 100 and the drain pipe joint 200 may be described using the drain pipe joint 100 as a representative.

[0040] <Vibration damping material: Drainage pipe joints are not limited to those made of resin> The vibration-damping material 714 of the innermost layer 710 constituting the outer layer member 700 of the drainage pipe fitting 100 is provided integrally with at least a portion of the outer peripheral surface of the pipe main body 110 at least in the portion passing through the through hole of the floor slab S. Note that the vibration-damping material 714 is not limited to being provided on the entire outer peripheral surface of the pipe main body 110, and may be provided on only a portion of the outer peripheral surface of the pipe main body 110 (as long as its position overlaps the floor slab S). Furthermore, the vibration-damping material 714 of the innermost layer 710 constituting the outer layer member 800 of the drainage pipe fitting 200 is provided integrally with at least a portion of the outer peripheral surface of the pipe main body 210 at least in the portion passing through the through hole of the floor slab S, and is also provided at the drainage pipe connecting portion 230. Note that the vibration-damping material 714 is not limited to being provided on the entire outer peripheral surface of the pipe main body 210, and may be provided on only a portion of the outer peripheral surface of the pipe main body 210 (as long as its position overlaps the floor slab S). 10 to 14, a vibration-damping material 714 is integrally provided on the pipe main body 210 instead of the thermally expandable fire-resistant sheet 712.

[0041] It is preferable that the vibration-damping material 714 is adhered or bonded to the entire outer peripheral surface on which the vibration-damping material 714 is provided, and is provided integrally with the surface. Furthermore, it is preferable that the vibration-damping material 714 is formed in a sheet shape and wrapped around the outer peripheral surface. In this way, by providing the innermost layer 710 as a vibration-damping material 714, for example butyl rubber, in close contact with at least a portion of the outer peripheral surface (outer surface) of the pipe main body 110 or the outer peripheral surface (outer surface) between the pipe main body 210 and the drain pipe connection portion 230, and integrating it with the drain pipe fitting, vibrations occurring in the drain pipe fitting can be extremely effectively suppressed.

[0042] It is also preferable to use a two-layer outer layer member in which vibration insulator 720 or vibration insulator 820, for example, made of rock wool, is provided on the outer periphery of vibration damping material 714, and it is also preferable to use a three-layer outer layer member in which sound-insulating cover 730, for example, an EPDM rubber cover, is provided on the outer periphery of vibration insulator 720 or vibration insulator 820. When this three-layer structure is adopted, it is preferable to provide vibration insulator 720 or vibration insulator 820 so that it is fixed not to vibration damping material 714 on the inner layer side but to sound-insulating cover 730 on the outer layer side.

[0043] More specifically, in the drainage pipe fitting 100, the pipe body 110 has at least a straight pipe section 116 and a reduced diameter section 118 below this straight pipe section 116, and in this case, the vibration insulator 720 is preferably provided so as to be fixed intermittently in the circumferential direction of the sound-insulating cover 730 in a height range corresponding to the straight pipe section 116. Also, in the drainage pipe fitting 100 and the drainage pipe fitting 200, the vibration insulator 720 or the vibration insulator 820 is preferably provided so as to be fixed by point attachment at two to four locations in the circumferential direction of the sound-insulating cover 730 on the outer layer side.

[0044] In this way, by providing vibration insulator 720, an example of which is a rock wool sheet, or vibration insulator 820 (having a different expanded shape from vibration insulator 720), as an intermediate layer and loosely fixing it in several places to sound insulating cover 730 on the outer layer side rather than to vibration damping material 714 on the inner layer side, sound absorption properties, fire resistance (when a heat-expandable fire-resistant material is provided instead of / in addition to vibration damping material 714), sound insulation and vibration insulation properties are exhibited, and by providing sound insulating cover 730, an example of which is an EPDM rubber cover, as the outermost layer and exhibiting water stoppage, sound insulation and vibration insulation properties, vibrations generated in the drainage pipe joint can be suppressed extremely effectively.

[0045] As described above, when the drainage pipe fitting 100 and the drainage pipe fitting 200 are formed from one or more (seven in this case) resin injection-molded products (non-fireproof) (when the drainage pipe fitting is limited to being made of resin), it is also preferable to provide a sheet-like heat-expandable fire-resistant sheet 712, instead of at least a portion of the vibration-damping material 714, on the outer circumferential surface of at least a portion of the pipe body 110 or the pipe body 210 that passes through the through-hole of the floor slab S. In this case, in the drainage pipe fitting 100, the sheet-like heat-expandable fire-resistant sheet 712 is provided on the pipe body 110 in place of a portion of the vibration-damping material 714 provided on the pipe body 110. In the drainage pipe fitting 200, the sheet-like heat-expandable fire-resistant sheet 712 is provided on (attached to) the pipe body 210 in place of all of the vibration-damping material 714 provided on the pipe body 210.

[0046] In this way, if the drainage pipe fitting 100 or the drainage pipe fitting 200 or the like catches fire, the heat will cause the heat-expandable fire-resistant sheet 712 to expand radially inward, crushing the hollow part of the drainage pipe fitting 100 or the drainage pipe fitting 200 and blocking the drainage pipe fitting 100 or the drainage pipe fitting 200, so that a drainage piping structure using these drainage pipe fittings 100 or the drainage pipe fitting 200 can block the pipeline to prevent the flow of flames, smoke, etc. in the event of a fire.

[0047] Furthermore, in the drainage pipe fitting 100, the pipe body 110 has at least a straight pipe section 116 and a reduced diameter section 118 below this straight pipe section 116, and in this case, it is also preferable that a heat-expandable fire-resistant sheet 712 is provided on the inner layer side of the vibration insulator 720 in place of part of the vibration-damping material 714, and that the vibration insulator 720 is fixed to the sound-insulating cover 730 on the outer layer side at a position above the heat-expandable fire-resistant sheet 712 and at a height position corresponding to the straight pipe section 116.

[0048] In this way, even if the drainage pipe fitting 100 or the like catches fire, the vibration insulator 720 is fixed to the outer layer sound-insulating cover 730 at a height position corresponding to the straight pipe section 116 and above the height position of the drainage pipe fitting 100 that is blocked by the heat-expandable fire-resistant sheet 712, thereby preventing the vibration insulator 720 from falling in the event of a fire.

[0049] <Soundproof cover: Drainage pipe joints are not limited to those made of resin> The sound-insulating cover 730 of the outermost layer constituting the outer layer member 700 of the drainage pipe fitting 100 is provided on the outer periphery of a vibration insulator 720 over the entire vertical length of the vibration insulator 720 provided on at least a part of the outer periphery of at least the part of the pipe body 110 that passes through the through-hole of the floor slab S. The sound-insulating cover 730 of the outermost layer constituting the outer layer member 800 of the drainage pipe fitting 200 is provided on the outer periphery of a vibration insulator 820 over the entire vertical length of the vibration insulator 820 provided on at least a part of the outer periphery of at least the part of the pipe body 210 that passes through the through-hole of the floor slab S.

[0050] By providing the sound insulating cover 730, which is an EPDM rubber cover for example, around the outer periphery of the vibration isolator 720 or 820 over the entire vertical length of the same, high sound insulating performance can be achieved. The sound-insulating cover 730, which is an example of an EPDM rubber cover, has water-stopping, sound-insulating, and vibration-insulating properties, and therefore exhibits high water-stopping and vibration-insulating properties in addition to the above-mentioned sound-insulating properties.

[0051] Furthermore, sound-insulating cover 730 preferably has upper-end water-stopping portion 732 at its upper end and / or lower-end water-stopping portion 734 at its lower end, and upper-end water-stopping portion 732 and / or lower-end water-stopping portion 734 are provided so as to abut (including when abutted by being joined with an adhesive or the like) the outer surface of drainage pipe joint 100 or drainage pipe joint 200. These upper-end water-stopping portion 732 and lower-end water-stopping portion 734 are formed by thick portions that are thicker than the main body of sound-insulating cover 730. This allows for high water-stopping performance to be achieved and also provides excellent strength.

[0052] Furthermore, this sound-insulating cover 730 is integrally molded with a cover body having a length corresponding to the overall vertical length of the vibration insulator 720 or vibration insulator 820, including the upper end water-stopping portion 732 and / or the lower end water-stopping portion 734, and it is preferable that the sound-insulating cover 730 itself be elastic. When sound-insulating cover 730 itself has elasticity in this way, it can be provided around the outer periphery of vibration insulator 720 or vibration insulator 820 over the entire vertical length of the cover, using the elasticity of sound-insulating cover 730 itself.

[0053] <Vibration insulator: Basically, drainage pipe joints are not limited to those made of resin, but a reduced diameter section is required> In the drainage pipe joint 100, the pipe main body 110 comprises at least a straight pipe section 116 and a reduced diameter section 118 below this straight pipe section 116, and in this case, the vibration insulator 720 of the middle layer constituting the outer layer member 700 of the drainage pipe joint 100 is provided on at least a part of the outer periphery of at least the part of the pipe main body 110 that passes through the through hole of the floor slab S. The vibration insulator 720 is a sheet having a predetermined shape shown in Figure 8(A) in an unfolded state (it may also have the shape of the vibration insulator 726 shown in Figure 8(B)), and is provided by being wrapped around the outer periphery of the straight pipe section 116 and the outer periphery of the reduced diameter section 118 with the edges of the sheet abutting against each other. Furthermore, after the drainage pipe joint 100 has been installed in the building, in a state where there is nothing attached to the outer periphery of the vibration insulator 720, the vibration insulator 720, including the portion where the end edges 720S1 or the end edges 726S1 shown in FIG. 8(A) or FIG. 8(B) abut, is not exposed to the upper floor side of the floor slab S, as shown in FIG. 5 to FIG. 8, and the portion where the end edges abut is one location (the portion where the end edges 720S2 or the end edges 726S2 shown in FIG. 8(A) or FIG. 8(B) abut). The floor slab S is exposed on the lower floor side in this state.

[0054] Therefore, even if the floor slab S is thin, the cut in the vibration insulator 720 or vibration insulator 726 can be made to appear only in one place (the cut where the end edges 720S2 or the end edges 726S2 abut each other) in the vertical direction (the vertical direction in the pipe body 110).This prevents the floor slab S from burning, and since the cut in the vibration insulator 720, which has weak strength, appears only in one place in the vertical direction (the vertical direction in the pipe body 110), the fire resistance of the vibration insulator 720 is not an issue, and it is possible to prevent the vibration insulator 720 from falling in the event of a fire.

[0055] 8(A), the predetermined shape of the vibration isolator 720 is a partial annular shape, and from the outer periphery of the annular shape toward the inner periphery of the annular shape, the annular shape has a length L(2) corresponding to the length L(1) of the vibration isolator 720 covered by the floor slab S, and has a plurality (here, five) of narrow grooves 722 with a predetermined width. The outer periphery of the annular shape is above the pipe main body 110. Each of the plurality of narrow grooves 722 is wound around the outer periphery of the straight pipe section 116 so as to close the grooves 722 (so that the groove sides 722S forming each narrow groove 722 abut each other and so that the sheet edges 720S1 abut each other), and the sheet is wound around the outer periphery of the reduced diameter section 118 so that the sheet edges 720S2 abut each other.

[0056] By wrapping the vibration insulator 720 as a sheet in this expanded shape around the outer circumferential surface of the pipe body 110, the fire resistance of the vibration insulator 720 is not an issue and it will not fall off in the event of a fire, even if the pipe body 110 has at least a straight pipe section 116 and a reduced diameter section 118 below this straight pipe section 116. In particular, when a rock wool sheet made by papermaking is used as the vibration insulator 720, although it is difficult to process the rock wool sheet made by papermaking into the three-dimensional shape (straight pipe section + reduced diameter section (tapered section)) of the pipe body 110 in the drainage pipe fitting 100 by sewing or the like, the vibration insulator 720 can be attached to the pipe body 110 without sewing or the like, and the vibration insulator 720 can be prevented from falling in the event of a fire.

[0057] <Thermal expansion fire-resistant material: Drainage pipe joints are basically limited to plastic> In the drainage pipe fitting 100 or the drainage pipe fitting 200, two types of heat-expandable fire-resistant materials with different thermal expansion coefficients, a heat-expandable fire-resistant material 612 and a heat-expandable fire-resistant sheet 712, are provided, which will be described in detail with reference to Figure 15. First, in these drainage pipe fittings 100 or 200, when two types of heat-expandable fire-resistant materials are provided at different radial positions, it is preferable that the heat-expandable fire-resistant material provided on the inner layer side has a higher thermal expansion coefficient than the heat-expandable fire-resistant material provided on the outer layer side, as shown in Figure 15(A).

[0058] Next, in the case where two types of heat-expandable fire-resistant materials are provided at different positions in the vertical direction in the drainage pipe joint 100 or the drainage pipe joint 200, it is preferable that the heat-expandable fire-resistant material provided at the upper side has a higher thermal expansion coefficient than the heat-expandable fire-resistant material provided at the lower side, as shown in Fig. 15(B). However, as will be described later, there are cases where this relationship between the thermal expansion coefficients in the vertical direction does not hold (as in the drainage pipe joint 100, for example).

[0059] As mentioned above, it is generally believed that a thermally expandable fire-resistant material with a high thermal expansion coefficient has poor shape retention after expansion, and a thermally expandable fire-resistant material with a low thermal expansion coefficient has good shape retention after expansion, so as shown in Figures 15(A) and 15(B), a low thermal expansion coefficient may result in insufficient fire resistance, while a low shape retention may result in the thermally expandable material falling off, creating a trade-off relationship. Taking these characteristics into consideration (utilizing the characteristics), and further taking into account the respective positions, weights, shapes, reaction speeds, and expansion onset temperatures, two types of thermally expandable fire-resistant materials are selected.

[0060] As for the characteristics of the thermally expandable fire-resistant material depending on its shape, between the putty-type and sheet-type employed in this embodiment, as shown in Figure 15(C), the putty-type thermally expandable fire-resistant material generally has a higher thermal expansion coefficient than the sheet-type thermally expandable fire-resistant material. Referring to Figure 15(D), four examples of possible placement of thermally expandable fire-resistant material in drainage pipe joints (installed in through holes in floor slab S, with or without a reduced diameter section) are described.

[0061] First, the second example shown in Figure 15(D) corresponds to Figure 15(A) and corresponds to a drainage pipe joint 200 according to the second embodiment. Although the height positions are the same (here, "same" means that there is no difference in height that would require consideration of the placement of the heat-expandable fire-resistant material), when the radial positions are different, the thermal expansion coefficient of the heat-expandable fire-resistant material on the inner radial layer is higher than the thermal expansion coefficient of the heat-expandable fire-resistant material on the outer radial layer. More specifically, in the drainage pipe joint 200, a putty-like heat-expandable fire-resistant material 612 filled in the recess 212 is used as the heat-expandable fire-resistant material on the inner layer, and a heat-expandable fire-resistant sheet 712 provided in contact with the outer layer of the putty-like heat-expandable fire-resistant material 612 filled in the recess 212 is used as the heat-expandable fire-resistant material on the outer layer. Since the putty-like material has a higher thermal expansion coefficient than the sheet-like material, the thermally expandable fire-resistant material 612 on the inner layer side has a higher thermal expansion coefficient than the thermally expandable fire-resistant sheet 712 on the outer layer side.

[0062] Next, the third example shown in Figure 15(D) corresponds to Figure 15(B), and although the radial positions are the same (same here means that there is no radial difference that would warrant considering the placement of the heat-expandable fire-resistant material), when the vertical positions are different, the thermal expansion coefficient of the heat-expandable fire-resistant material on the upper side in the vertical direction is higher than the thermal expansion coefficient of the heat-expandable fire-resistant material on the lower side. Furthermore, in the fourth example shown in Figure 15(D), when both the radial position and the height position are different, a heat-expandable fire-resistant material with a high thermal expansion coefficient is arranged on the upper height side and the inner radial layer side, and a heat-expandable fire-resistant material with a low thermal expansion coefficient is arranged on the lower height side and the outer radial layer side.

[0063] Finally, the first example shown in Figure 15(D) corresponds to the drainage pipe joint 100 according to the first embodiment. In this case, two types of thermally expandable fire-resistant materials are provided at different positions in the vertical direction. Normally, as shown in Figure 15(B) (and also as in the third and fourth examples of Figure 15(D)), a thermally expandable fire-resistant material with a high thermal expansion coefficient would be arranged at the upper vertical position, and a thermally expandable fire-resistant material with a low thermal expansion coefficient would be arranged at the lower vertical position. However, in the drainage pipe joint 100, a putty-like thermally expandable fire-resistant material 612 filled in the recess 112 is used as the lower thermally expandable fire-resistant material, and a sheet-like thermally expandable fire-resistant sheet 712 is used as the upper thermally expandable fire-resistant material. Because the putty-like material has a higher thermal expansion coefficient than the sheet-like material, the lower thermally expandable fire-resistant material 612 has a higher thermal expansion coefficient than the upper thermally expandable fire-resistant sheet 712, which does not conform to Figure 15(B).

[0064] In the drainage pipe joint 100, the pipe body 110 has a reduced diameter section 118 below the straight pipe section 116, and a putty-like heat-expandable fire-resistant material 612 with a high thermal expansion coefficient is used in the reduced diameter section 118, so that the reduced diameter section 118 with a small pipe diameter is quickly blocked by the putty-like heat-expandable fire-resistant material 612 with a high thermal expansion coefficient. On the other hand, because the shape stability is low (it becomes easy to fall off), the outer layer side of the heat-expandable fire-resistant material 612 is covered with a vibration insulator 720 such as rock wool, which also has fire resistance and flame-blocking properties, and by maintaining the shape of the reduced diameter section 118, where the pipe diameter gradually becomes smaller, this putty-like heat-expandable fire-resistant material 612 is prevented from falling off, thereby compensating for the low shape stability.

[0065] In this way, there may be exceptions to the height direction in the arrangement of the thermally expandable fire-resistant material based on the thermal expansion coefficient. Note that the thermally expandable fire-resistant material in Fig. 15(D) is shown as a rectangle to indicate a sheet shape, but the thermally expandable fire-resistant material in Fig. 15(D) may be in a putty-like shape even if it is in a sheet shape. It may be a combination of two sheets, a combination of two putty-like putties, or a combination of two sheets and one putty, and as long as two types of heat-expandable fire-resistant materials with different thermal expansion coefficients are used, it is within the scope of the present invention to use a third type of heat-expandable fire-resistant material in a third location, not just in two locations.

[0066] In addition to the examples of arrangement of heat-expandable fire-resistant materials described above, another example is that in a case where the pipe body 110 has at least a straight pipe section 116 and a reduced diameter section 118 below this straight pipe section 116, two types of heat-expandable fire-resistant materials are provided at different radial positions within the height range of the straight pipe section 116. Furthermore, in another example, two types of heat-expandable fire-resistant materials with different thermal expansion coefficients are provided in the straight pipe section 116 and the reduced diameter section 118. For example, the drainage pipe joint 100 is such an example.

[0067] In another example, two types of heat-expandable fire-resistant materials having different thermal expansion coefficients are provided so as to have overlapping portions, such as in the drainage pipe joint 200. Another example is where at least one of the two types of heat-expandable fire-resistant materials with different thermal expansion coefficients is provided at a position corresponding to the floor slab S. For example, the drainage pipe joint 100 and the drainage pipe joint 200 are such examples, where the heat-expandable fire-resistant sheet 712 is hindered by the floor slab S and cannot expand toward the outer layer side, but can only expand toward the inner layer side in the radial direction, thereby quickly crushing and blocking the hollow part of the drainage pipe joint 100 or the drainage pipe joint 200.

[0068] As described above, such thermally expandable fire-resistant materials with different thermal expansion coefficients are preferably provided in either a ring-shaped sheet form that is provided in a ring shape around the straight pipe section 116 of the drainage pipe fitting 100, or a putty-shaped fill form that is provided by filling the recess 112 of the drainage pipe fitting 100 or the recess 212 of the drainage pipe fitting 200. In this way, vibration damping properties can be exhibited by the sheet-shaped thermally expandable fire-resistant material provided in a ring-shaped form and the putty-shaped thermally expandable fire-resistant material provided in a fill form.

[0069] <Installation method of drainage pipe joints: Basically, drainage pipe joints are limited to those made of resin> The construction method for placing and installing a drainage pipe joint in a through hole in the floor slab S of a building will be described below. Drainage pipe joints that are preferably employed in this construction method further have the following structural features in the drainage pipe joint 100 and the drainage pipe joint 200. In the following, the drainage pipe joint 100 will be described as a representative example.

[0070] This drainage pipe joint 100 is formed entirely from one or more resin injection moldings, and when installed in a building, it comprises a pipe body 110 placed in the through-hole of the floor slab S, an upper riser pipe connection part 120 that connects a drainage standpipe 520 that protrudes above the floor slab S and allows drainage water from the upper floor to flow in, a drainage pipe connection part 130 that protrudes below the floor slab S and connects a drainage pipe (here, a drainage standpipe 530) that allows drainage water to flow out to the lower floor, and a drainage pipe connection part 130 that connects a drainage standpipe 520 that protrudes below the floor slab S and allows drainage water to flow out to the lower floor. A drainage piping joint having a horizontal branch pipe connection part 140 that connects a drainage horizontal branch pipe 510 above the slab S, and further structural features include the fact that the upper riser pipe connection part 120 or the horizontal branch pipe connection part 140 is formed of transparent resin, vibration-damping material 714 is provided integrally with the pipe main body 110 on at least a portion of the outer surface of the pipe main body 110, and the receiving portion of the upper riser pipe connection part 120 or the receiving portion of the horizontal branch pipe connection part 140 does not have any shielding material that would prevent the transparent resin from being seen. In this way, before construction, this drainage pipe fitting 100 has vibration-damping material 714 integrally provided with the pipe body 110 on at least a portion of the outer surface of at least the portion of the pipe body 110 that passes through the through hole in the floor slab S, and the upper riser pipe connection portion 120 or the horizontal branch pipe connection portion 140 is formed of transparent resin, and the receiving portion of the upper riser pipe connection portion 120 or the receiving portion of the horizontal branch pipe connection portion 140 does not have any obstruction that would prevent the transparent resin from being visible.

[0071] 5, in this drainage pipe fitting 100, the upper riser pipe connection part 120 or the horizontal branch pipe connection part 140 is formed of a transparent resin (including both colorless and transparent) and, before construction, the receiving port part of the upper riser pipe connection part 120 or the receiving port part of the horizontal branch pipe connection part 140 is not provided with any shielding material that would prevent the transparent resin from being seen. Note that, here, before construction, vibration-damping material 714 is provided in parts other than the receiving port part of the upper riser pipe connection part 120 or the receiving port part of the horizontal branch pipe connection part 140, but it is also possible that these vibration-damping materials 714 are not provided at all and are installed later after construction.

[0072] The construction method for placing a drainage pipe fitting 100 further having such structural features in a through hole in the floor slab S of a building involves connecting the drainage riser pipe 520 to the upper riser pipe connection part 120 while visually checking (while checking) the fitting state between the upper riser pipe connection part 120 and the drainage riser pipe 520 through the transparent resin of the upper riser pipe connection part 120, and connecting the drainage horizontal branch pipe 510 to the horizontal branch pipe connection part 140 while visually checking (while checking) the fitting state between the horizontal branch pipe connection part 140 and the drainage horizontal branch pipe 510 through the transparent resin of the horizontal branch pipe connection part 140.

[0073] Then, while visually checking (recognizing) the receiving port portion of the transparent resin in this manner, the drainage riser pipe 520 is connected to the upper riser pipe connection portion 120 and the drainage horizontal branch pipe 510 is connected to the horizontal branch pipe connection portion 140, and after the drainage pipe fitting 100 has been placed in the through hole of the floor slab S, mortar M is filled into the gap between the through hole of the floor slab S and the drainage pipe fitting 100. Furthermore, after filling with this mortar M, a sound-insulating member is provided on the outer periphery of the upper riser pipe connecting portion 120 or the outer periphery of the horizontal branch pipe connecting portion 140. This sound-insulating member is different from the above-described sound-insulating cover 730 (basically, although it may be the same), and is described as a general name that has vibration-damping and / or vibration-insulating properties in addition to sound-insulating properties as the name suggests. Examples of such sound-insulating members include providing the above-described vibration-damping material 714 in the receiving portion, providing the above-described vibration-insulating material 720 typified by rock wool and / or a sound-insulating cover 730 formed of a rubber cover made of EPDM or the like instead of / in addition to the vibration-damping material 714, or providing a glass wool vibration insulator different from rock wool and / or a sound-insulating cover formed of a cover made of vinyl chloride or the like instead of / in addition to the vibration-damping material 714. In this case, it is also preferable to provide vibration-damping material 714 on the inner layer side of this sound-insulating material at the receiving portion of the upper riser pipe connection portion 120 or the horizontal branch pipe connection portion 140 (and also at other portions including the receiving portion if vibration-damping material 714 is not provided other than at the receiving portion before construction).

[0074] In this case, the sound-insulating member may be installed so as to cover the outer periphery of the drainage pipe joint 100, or the sound-insulating member may include glass wool as a sound-absorbing material and a vinyl chloride sound-insulating sheet as a sound-insulating cover, and the glass wool sound-absorbing material may be fixed (including by sewing, adhesive, etc.) to the vinyl chloride sound-insulating cover on the outer layer (rather than to the vibration-damping material 714 on the inner layer).

[0075] In this way, before construction of the drainage pipe fitting 100, the receiving portion of the upper riser pipe connecting portion 120 or the horizontal branch pipe connecting portion 140, which is formed of transparent resin, does not have any shielding material that would obscure the transparent resin, so the fitted state of the upper riser pipe connecting portion 120 and the drainage riser 520 or the fitted state of the horizontal branch pipe connecting portion 140 and the horizontal drainage branch pipe 510 can be visually confirmed through the transparent resin to connect the drainage pipes, thereby reducing construction errors. Also, since the soundproofing member containing rock wool, glass wool, or the like as a sound-absorbing material is attached to the drainage pipe fitting 100 after backfilling with mortar M, the outer diameter of the drainage pipe fitting 100 does not increase when backfilling with mortar M, making it easier to backfill with mortar M, and also eliminating the possibility of moisture from the mortar M splashing onto the rock wool, glass wool, or the like and wetting them.

[0076] As described above, the drain pipe connection portions of the drain pipe fitting 100 are formed from transparent resin, and construction of the drain pipe fitting 100 can be started before construction in a state where the transparent resin at the receiving portions of those connections can be visually observed (no obstructions that would obscure the transparent resin at the receiving portions), so the connection state of the drain pipe fitting 100 to other drain pipes can be visually confirmed while connecting, which reduces construction errors, makes it easier to backfill with mortar M because a soundproofing material containing rock wool, glass wool, or the like is provided after backfilling with mortar, and eliminates the possibility of wetting the rock wool, glass wool, or the like with moisture in the mortar M. Then, after construction of this drain pipe fitting 100, as described above, drainage vibrations can be extremely effectively suppressed, fire resistance can be fully exhibited, and high water-stopping performance can be exhibited.

[0077] It should be noted that the embodiments disclosed herein should be considered to be illustrative in all respects and not restrictive. The scope of the present invention is defined by the claims, not by the above description, and is intended to include all modifications within the meaning and scope of the claims. [Industrial Applicability]

[0078] The present invention is preferred for drainage pipe joints that are installed through the floor slab S of a building, and is particularly preferred for drainage pipe joints that are installed through the floor slab of a building in that they can exhibit optimal fire spread prevention effects. [Explanation of symbols]

[0079] 100, 200 Drainage pipe joint 110, 210 tube body 112, 212 recesses 114 Swirl blade 120 Upper riser connection 130, 230 Drainage pipe connection 140 Horizontal branch pipe connection 142 Water Collection Chamber 144, 146, 148 Horizontal branch pipe connecting member 520 (upper floor side) drainage standpipe 530 (lower floor side) drainage standpipe 540 (lower floor side) 90 degree (compact) vent pipe 612 Thermal expandable fireproofing materials 700, 800 outer layer material 710 innermost layer 712 Thermally Expandable Fireproof Sheet 714 Damping material 720, 820 Vibration insulators (made of fire-resistant inorganic fibers) 730 Soundproof Cover

Claims

1. A drainage pipe joint comprising: a pipe body formed from one or more resin injection-molded products, which is placed in a through-hole in a floor slab when installed in a building; an upper riser pipe connector that protrudes above the floor slab and connects to a drainage riser pipe that allows drainage water from an upper floor to flow in; a drainage pipe connector that protrudes below the floor slab and connects to a drainage pipe that allows drainage water to flow out to a lower floor; and a horizontal branch pipe connector that connects a horizontal drainage branch pipe above the floor slab, A drainage pipe joint characterized by being provided with two types of heat-expansive fire-resistant materials having different thermal expansion coefficients.

2. A drainage pipe fitting as described in claim 1, characterized in that the two types of heat-expandable fire-resistant materials are provided at different radial positions in the drainage pipe fitting, and the heat-expandable fire-resistant material provided on the inner layer side has a higher thermal expansion coefficient than the heat-expandable fire-resistant material provided on the outer layer side.

3. A drainage pipe joint as described in claim 1, characterized in that the two types of heat-expandable fire-resistant materials are provided at different positions in the vertical direction of the drainage pipe joint, and the thermal expansion coefficients of the heat-expandable fire-resistant material provided on the upper side and the heat-expandable fire-resistant material provided on the lower side are different.

4. The pipe body includes at least a straight pipe portion and a reduced diameter portion below the straight pipe portion, A drainage pipe joint as described in any one of claims 1 to 3, characterized in that two types of heat-expandable fire-resistant materials are provided at different radial positions within the height range of the straight pipe section.

5. The pipe body includes at least a straight pipe portion and a reduced diameter portion below the straight pipe portion, A drainage pipe joint as described in any one of claims 1 to 3, characterized in that two types of heat-expandable fire-resistant materials with different thermal expansion coefficients are provided in the straight pipe section and the reduced diameter section, respectively.

6. A drainage pipe joint according to any one of claims 1 to 5, characterized in that the two types of thermally expandable fire-resistant materials have overlapping portions.

7. A drainage pipe joint according to any one of claims 1 to 6, characterized in that at least one of the two types of thermally expandable fire-resistant material is provided at a position corresponding to the floor slab.

8. A drainage pipe fitting as described in any one of claims 1 to 7, characterized in that the thermally expandable fire-resistant material is provided in either a sheet-like annular form that is arranged in a ring shape around the straight pipe section of the drainage pipe fitting, or a putty-like filled form that is filled into a recess of the drainage pipe fitting.

9. A drainage pipe fitting as described in claim 8, characterized in that vibration damping properties are exhibited by the sheet-like heat-expandable fire-resistant material provided in the annular form and the putty-like heat-expandable fire-resistant material provided in the filled form.

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