JP7498658B2 - Drainage pipe fittings - Google Patents

Description

The present invention relates to a drainage pipe joint that penetrates the floor slab of a building, and in particular to a drainage pipe joint that can achieve optimal vibration control performance, vibration insulation performance, and sound insulation performance.

Water supply and drainage facilities are installed in apartment buildings, office buildings, etc. A representative drainage system is widely known to have 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 piping joints that connect these.
When installed in a building, such a drainage pipe joint includes a pipe body that is placed in the through hole of the floor slab, an upper riser pipe connection part that protrudes above the floor slab and connects a drainage riser pipe that allows drainage water from the upper floor to flow in, a lower riser pipe connection part that protrudes below the floor slab and connects a drainage riser pipe that allows drainage water to flow down to the lower floor, and a horizontal branch pipe connection part that connects a horizontal drainage branch pipe above the floor slab. Furthermore, many of the pipe bodies include a part (e.g., a swirl vane, a deflector, etc.) that changes the flow of drainage water in the drainage pipe joint. Also, as such a drainage pipe joint, one formed of one or more injection molded resin products is widely known.

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, smoke, 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 piping joints separately around the periphery of the piping material or embedded within the wall of the piping material, so that in the event of a fire, the through holes in the floor slab are kept blocked by this heat-expandable fire-resistant material.

As an example of such technology, Japanese Patent No. 6576711 (Patent Document 1) discloses a drainage pipe joint that is piped by penetrating the floor slab of a building, and that includes a joint body to which a drainage pipe is connected, and a first covering material that covers the outer surface of the portion of the joint body that penetrates the floor slab, the joint body being made of a thermoplastic resin, and the first covering material being integrally made of 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 skin layer, arranged in this order from the inside, and a thermal expansion material that is sandwiched between the first sound absorbing layer and the second sound absorbing layer and provided in at least one ring shape around the joint body.

Patent No. 6576711

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 a first covering material, and the outer surface of the part that protrudes from the top surface of the floor slab is covered with a second covering material. (1) The first covering material is composed of, from the inside: a first sound-absorbing layer made of sponge material (urethane foam)
- A second sound absorbing layer (glass wool) consisting of a thermal expansion material and an inorganic fiber aggregate sandwiched between the first sound absorbing layer and the second sound absorbing layer
-Waterproof and soundproof surface layer (aluminum glass cloth)
(2) The second covering material is composed of an upper sound-absorbing layer (felt) made of sound-absorbing material from the inside.
- Upper sound insulation layer made of sound-proofing material (butyl rubber)
The structure is disclosed.

However, the structure disclosed in Patent Document 1 merely 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 this does not seem to provide optimal vibration control performance, vibration insulation performance, and sound insulation performance.

The present invention was developed in consideration of the above-mentioned problems, and its purpose is to provide a drainage pipe joint that penetrates the floor slab of a building and that can achieve optimal vibration control performance, vibration insulation performance, and sound insulation performance.

In order to achieve the above object, the drainage pipe joint according to the present invention employs the following technical measures.
In other words, the drainage piping joint of the present invention is a drainage piping joint that, when installed in a building, comprises a pipe body that is placed in a through hole in a 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 has a vibration-damping material integrally provided on at least a portion of the outer surface of at least the portion of the pipe body that passes through the through hole.

Preferably, the vibration-damping material can be configured to be adhered or bonded to the entire surface of the outer circumferential surface on which the vibration-damping material is provided.
More preferably, the vibration-damping material may be formed in a sheet shape and wrapped around the outer circumferential surface.
More preferably, a vibration insulator may be provided on the outer periphery of the vibration-damping material.

More preferably, a sound insulating cover may be provided on the outer periphery of the vibration insulator.
More preferably, the vibration insulator can be configured to be fixed to the sound insulation cover on the outer layer side.
More preferably, the pipe body at least comprises a straight pipe section and a reduced diameter section below the straight pipe section, and the vibration insulator can be configured to be intermittently fixed in the circumferential direction of the sound-proof cover in a height range corresponding to the straight pipe section.

More preferably, the vibration insulator can be configured to be fixed by point attachment at two to four points in the circumferential direction of the sound insulation cover on the outer layer side.
More preferably, the drainage pipe joint can be formed from one or more resin injection-molded products and configured to have a portion in which a sheet-like heat-expandable fire-resistant material is provided on the outer peripheral surface in place of at least a portion of the vibration-damping material.

More preferably, the drain pipe joint is formed from one or more resin injection-molded products, the pipe body has at least a straight pipe section and a reduced diameter section below the straight pipe section, a heat-expandable fire-resistant material is provided on the inner layer side of the vibration insulator in place of a portion of the vibration-damping material, and the vibration insulator is fixed to the sound-insulating cover on the outer layer side at a position above the heat-expandable fire-resistant material and at a height position corresponding to the straight pipe section.

More preferably, the vibration-damping material is formed to include a butyl-based or asphalt-based material, and the sound-insulating cover is formed to include a rubber-based, elastomer-based or olefin-based material.
More preferably, the sound-proof cover includes a non-elastic cover body having a length corresponding to the overall vertical length of the vibration insulator, and can be configured to have elastic material only at the upper end, or at the upper end and lower end, between the cover body and the outer surface of the drain pipe fitting.

More preferably, the elastic material may be provided on an inner peripheral surface of the cover body or an outer surface of the drain pipe joint.
More preferably, the cover body can be made of a hard resin.
More preferably, the sound-proof cover can be configured to abut against the outer surface of the drainage pipe joint via a ring-shaped, elastic ring elastic material that corresponds to the outer diameter of the drainage pipe joint.

More preferably, the vibration insulator can be configured to be fixed to the sound-insulating cover on the outer layer side by continuously or intermittently fixing one circumference of the vibration insulator to at least one location in the height direction of the sound-insulating cover on the outer layer side.

The present invention provides a drainage pipe joint that penetrates the floor slab of a building and that can provide optimal vibration control, vibration insulation, and sound insulation performance.

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. 2A and 2B are perspective views showing the drainage piping structure of FIG. 1, in which (A) is an oblique view showing the state after an outer layer member 700 is provided on the drainage piping joint 100, and (B) is an oblique view showing the state before the outer layer member 700 is provided on the drainage piping joint 100. 1A is a perspective view showing a drainage pipe fitting 100, in which (A) is a perspective view showing the state after a heat-expandable fire-resistant material 612 and a heat-expandable fire-resistant sheet 712 have been provided, and (B) is a perspective view showing the state before the heat-expandable fire-resistant material 612 and the heat-expandable fire-resistant sheet 712 have been provided. FIG. 4A is an exploded view of the drainage pipe joint 100 shown in FIG. 3B, and FIG. 4B is a perspective view of the pipe body 110 seen through the pipe wall. 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 adopted. FIG. 6 is a partially enlarged cross-sectional view of FIG. 5 (without the recessed cross-section). FIG. 6 is a partially enlarged cross-sectional view of FIG. 5 (including a recessed cross-section). FIG. 6A is a development of rock wool, an example of a vibration insulator 720 (formed from fire-resistant inorganic fibers) that forms the three-layered outer layer member 700 shown in FIG. 5 , and FIG. 6B is a development of rock wool, an example of a vibration insulator 726, a comparative example. 1A and 1B 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. 10A and 10B are diagrams showing the drainage piping structure of FIG. 9, in which (A) is an oblique view showing the state after an outer layer member 800 is provided on the drainage pipe joint 200, and (B) is an oblique view showing the state before the outer layer member 800 is provided on the drainage pipe joint 200. 1A and 1B are perspective views 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 provided, and (B) is an oblique view showing the state before the heat-expandable fire-resistant material 612 and the heat-expandable fire-resistant sheet 712 have been provided. (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. 13 is a cross-sectional view taken along line 13-13 of FIG. 1, showing a drainage piping structure in which the drainage piping joint 200 is adopted. FIG. 14 is a partially enlarged cross-sectional view of FIG. 13. 1A to 1E are diagrams for explaining the arrangement of the thermally expandable fireproof material. FIG. 1 is a cross-sectional view showing a drainage piping structure in which a drainage pipe joint 101 according to a first modified example of the present invention is adopted. 17 is a diagram for explaining the state in which the sound-insulating cover is set on the pipe body in the drainage pipe joint 101 of FIG. 16. FIG. 10 is a cross-sectional view showing a drainage piping structure in which a drainage pipe joint 101 according to a second modified example of the present invention is adopted. FIG. 19 is a diagram for explaining the state in which the sound-proof cover is set on the pipe body in the drainage pipe joint 103 of FIG. 18. FIG. FIG. 17 is a diagram for explaining a construction method for setting the pipe body in the soundproof cover embedded in the slab in the drainage pipe joint 101 of FIG. 16. 19 is a diagram for explaining a construction method for setting the pipe body in the soundproof cover embedded in the slab in the drainage pipe joint 103 of FIG. 18. FIG.

In the following, the drain pipe joint 100 according to the first embodiment of the present invention will be described in detail with reference to Figs. 1 to 8, and the drain pipe joint 200 according to the second embodiment of the present invention will be described in detail with reference to Figs. 9 to 15, including the construction method. Here, the perspective views shown in Figs. 2 to 4 and Figs. 10 to 12 are schematic views, and may not be completely consistent with other views (e.g. Figs. 5 and 13) (e.g., the presence or absence of a drain pipe connected to the drain pipe joint 100 or the drain pipe joint 200, the presence or absence of a vibration damping material 714 provided other than the receiving portion of the upper riser pipe connection portion 120 and other than the receiving 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, and the outside, the outer layer side, the outer peripheral side, and the outside, and the inner layer side, the inner peripheral side, and the inside may not be clearly distinguished from each other.

＜Overview＞
As shown in Figures 1 and 5, as well as Figures 9 and 13, a drainage piping structure using a drainage pipe joint 100 or a drainage pipe joint 200 according to an embodiment of the present invention includes a drainage pipe joint 100 or a drainage pipe joint 200 provided in a through hole that vertically penetrates a floor slab S in a building, a drainage rise pipe 520 on the upper floor side that is connected to the drainage pipe joint 100 or the drainage pipe joint 200 above the floor slab S and allows drainage water from the upper floor to flow in, a drainage horizontal branch pipe 510 (three in this case) connected to the drainage pipe joint 100 or the drainage pipe joint 200 above the floor slab S, and a drainage rise pipe 530 or a 90-degree bent pipe 540 on the lower floor side that is connected to the drainage pipe joint 100 or the drainage pipe joint 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, whereas the drainage piping structure using the drainage pipe joint 200 is used on the lowest floor, and 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.

Here, the drain pipe joint 100 or drain pipe joint 200 used in these drain pipe structures and the drain pipes connected to these drain pipe joints are made of non-fire-resistant resin. However, the drain pipe joints according to the present invention are mixed in cases where they are limited to such non-fire-resistant resin and cases where they are not limited to resin and include materials other than resin such as cast iron. For this reason, in the following, the drain pipe joint 100 and drain pipe joint 200 and the drain pipes connected to these drain pipe joints are described as being made of non-fire-resistant resin, and cases where they are not limited to resin will be described as appropriate in the description. Here, "non-fire-resistant" refers to a property that can be deformed, melted, or burned by the heat caused by a fire in a building, and for example, resin is included. In addition, when resin is used, the drainage pipe joint 100, drainage pipe joint 200, and the pipes connected to them (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 molded from, for example, polyvinyl chloride, polyethylene, polybutene, polypropylene, or nylon. For the drainage standpipe, for example, a so-called fire-resistant two-layer pipe may be used.

The drainage pipe joint 100 is formed of one or more (seven in this example) resin injection moldings as shown in Figures 4(A) and 5, and the drainage pipe joint 200 is formed of one or more (seven in this example) resin injection moldings as shown in Figures 12(A) and 13. The drainage pipe joint 100 is formed of one or more (seven in this example) resin injection moldings as shown in Figures 1, 4(A) and 5, and includes a pipe body 110 that is placed in the through hole of the floor slab S when installed in a building, an upper riser pipe connection part 120 that connects a drainage riser pipe 520 that protrudes above the floor slab S and allows drainage 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, the drainage riser pipe 530) that flows out to the lower floor, and a horizontal branch pipe connection part 140 that connects a drainage horizontal branch pipe 510 above the floor slab S. 9, 12(A) and 13, the drainage pipe joint 200 includes a pipe body 210 that is placed in the through hole of the floor slab S when installed in a building, an upper riser pipe connection part 120 that connects a drainage riser pipe 520 that protrudes above the floor slab S and allows drainage from the upper floor to flow in, a drainage pipe connection part 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 to flow out to the lower floor, and a horizontal branch pipe connection part 140 that connects a drainage horizontal branch pipe 510 above the floor slab S. Thus, the drainage pipe joint 100 and the drainage pipe joint 200 are different in the pipe body 110 and the pipe body 210, the drainage pipe connection part 130 and the drainage pipe connection part 230, and 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 something in common above the floor slab S. The same reference numerals are used for these common parts of the drain pipe joint 100 and the drain pipe joint 200.

As shown in these figures, the common parts of the drainage pipe joint 100 and the drainage pipe joint 200 are the horizontal branch pipe connection part 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 connection member 144, a second horizontal branch pipe connection member 146, and a third horizontal branch pipe connection member 148 for connecting the drainage horizontal branch pipe corresponding to the position of the openings. Here, although not limited thereto, the first horizontal branch pipe connection member 144, the second horizontal branch pipe connection member 146, and the third horizontal branch pipe connection member 148 all connect the drainage horizontal branch pipe 510 without reducing the diameter, but the pipe diameter may be changed.

The pipe body 110 of the drain pipe joint 100 and the pipe body 210 of the drain pipe joint 200 differ in the following points. The pipe body 210 is shorter in the drain direction than the pipe body 110, does not have the tapered portion 118 (tapered) of the pipe body 110, and does not have the swirl vane 114 as a protrusion that protrudes from the inner surface of the pipe body 110 between the horizontal branch pipe connection portion 140 and the drain pipe connection portion 130 in the pipe body 110. A recess 112 corresponding to this protrusion (here, the swirl vane 114) is formed on the outer surface of the pipe body 110, and the putty-like heat-expandable fireproof material 612 is filled in the recess 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 heat-expandable fireproof material 612.

Here, the thermally expandable fireproof material 612 filled in the recess 112 or the recess 212 will be described. The thermally expandable fireproof material 612 is formed, for example, from a resin composition containing a resin component mainly composed of butyl rubber, a phosphorus compound, neutralized thermally expandable graphite, a hydrous inorganic substance, and a metal carbonate, or a resin composition containing an epoxy resin, a phosphorus compound, neutralized thermally expandable graphite, and an inorganic filler. For this thermally expandable fireproof material 612, for example, "Fiblock" (expands 5 to 40 times at a reaction temperature of 200°C) manufactured by Sekisui Chemical Co., Ltd. is used. In addition, "Thermal Expandable Heat-Resistant Sealing Material IP" (expands from 120°C and expands to 4 times or more in volume) manufactured by Inaba Denki Sangyo Co., Ltd. and "Heatmel" (expansion start temperature 120°C, significant expansion temperature 260°C, expands 4 to 8 times) manufactured by Furukawa Techno Material Co., Ltd. can be used as the thermally expandable fireproof material 612.

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 satisfies various conditions such as 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 drain pipe fitting 100 or the depression 212 on the outer surface of the pipe body 210 of the drain pipe fitting 200 so as to fill the depression 112 up to approximately 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).

Here, the protrusion of the pipe body 110 is not limited to the swirling vane 114, but may be a deflection plate or the like, as long as it is a part that changes the flow of the drainage in the drainage pipe joint 100, and is not limited to the swirling vane or the deflection plate, as long as the corresponding recess 112 is formed on the outer surface of the pipe body 110. Furthermore, the recess 212 of the pipe body 210 is not limited to the shape shown in the figure. In any of the drainage pipe joints 100 and 200, the thermally expandable fireproof material 612 is filled in the recess on the outer surface of these drainage pipe joints. Note that, as shown in FIG. 12(B), the recess of the pipe body 210 is formed as the pipe body 210 is reduced in diameter, but since the inner wall of the pipe body 210 expands downstream, in order to distinguish it from the reduced diameter portion 118 of the pipe body 110, the pipe body 210 is not described as having a reduced diameter portion (tapered portion).

Furthermore, in correspondence with the height position of the pipe body 110 corresponding to the floor slab S, a sheet-shaped heat-expandable fireproof sheet 712 is provided so as to be wrapped around the outer peripheral surface of the pipe body 110 as shown in Figs. 3 and 5, and in correspondence with the height position of the pipe body 210 corresponding to the floor slab S, a sheet-shaped heat-expandable fireproof sheet 712 is provided so as to be wrapped around the outer peripheral surface of the pipe body 110 as shown in Figs. 11 and 13. These heat-expandable fireproof materials 612 and heat-expandable fireproof sheets 712 are vertically spaced apart in the pipe body 110, whereas in the pipe body 210, they have portions that overlap each other in the radial direction without being vertically spaced apart. Note that the dashed lines in Figs. 3 and 11 indicate removal.

In a building that employs such a drainage piping structure, if the drainage piping joint 100 or the drainage piping joint 200 etc. burns, the heat causes the thermally expandable fire-resistant material 612 and the thermally expandable fire-resistant sheet 712 to expand radially inward, causing the body of the drainage piping joint 100 or the drainage piping joint 200 to crush the hollow portion and block the drainage piping joint 100 or the drainage piping joint 200. This allows the drainage piping structure that uses the drainage piping joint 100 or the drainage piping joint 200 to block the pipeline in the event of a fire to prevent the flow of flames, smoke, etc.

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, when the heat-expandable fire-resistant sheet 712 of such heat-expandable refractory materials cannot be provided (in this portion regardless of the reason), it is preferable to provide a vibration-damping material 714 in place of the heat-expandable fire-resistant sheet 712.
For the drainage pipe fitting 100, please refer to Figures 5 to 7, and for the drainage pipe fitting 200, please refer to Figures 13 to 14. The outer layer member 700 and the outer layer member 800 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.

As shown in these figures, the outer layer member 700 and the outer layer member 800 have a three-layer structure, and are provided in the following order from the outer surface of the drain pipe joint 100 or the drain pipe joint 200: a vibration damping material 714 (or a heat-expandable fireproof sheet 712), a vibration insulator 720 or a vibration insulator 820 made of fire-resistant inorganic fiber, and a sound insulating cover 730 on the outer surface of the pipe main body 110 or on the outer surface of the pipe main body 210 and the drain pipe connection part 230. The vibration insulator 720 and the vibration insulator 820 have different shapes when deployed, which will be described in detail later.
The recess 112 or the 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 by filling the hollow portion of the recess 112 or the recess 212 with the putty-like heat-expandable fire-resistant material 612.

In the drain pipe joint 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 a 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 in place of the vibration-damping material 714 at a position of the pipe body 110 above 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 the same). In the drain pipe joint 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 a pressure-sensitive adhesive). And, in terms of fire resistance, at a position on the pipe body 210 above the drain pipe connection part 230, 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 (and further, on the radially inner side, a heat-expandable fire-resistant material 612 is filled in the recess 212). 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 the same).

As will be described in detail later, the thermal expansion coefficients of the thermally expandable fire-resistant material 612 and the thermally expandable fire-resistant sheet 712 are different. Here, 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. A low thermal expansion coefficient may not provide sufficient fire resistance, and 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, etc.), the thermally expandable materials contained in the thermally expandable fire-resistant material 612 and the thermally expandable fire-resistant sheet 712 are selected in accordance with their respective positions, weights, shapes, reaction speeds, and expansion start temperatures, etc.

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 (butyl rubber, etc.) or asphalt-based (rubber asphalt, modified asphalt, etc.) material, the sound-insulating cover 730 is formed containing a rubber-based (EPDM (ethylene propylene diene rubber) etc.), elastomer-based or olefin-based (polyethylene resin, etc.) material, and the vibration insulators 720 and 820 formed from fire-resistant inorganic fibers consist of an aggregate of fire-resistant inorganic fibers (porous material).

Here, examples of inorganic fibers include artificial mineral fibers, such as glass wool, rock wool, or ceramic fibers, which are preferable because of their high vibration insulation performance as well as their high sound absorption performance. The vibration caused by the drainage flowing down the pipe body 110 or pipe body 210 and the drain pipe connection part 230 (for example, the vibration caused by hitting the swirl vane 114) is suppressed by the vibration damping material 714, and the vibration is further blocked (and/or the noise caused by the vibration is absorbed) by the vibration insulator 720 made of this rock wool, etc., and the transmission of the noise caused by the vibration is further blocked by the sound insulation cover 730 made of a rubber cover made of EPDM, etc. Here, rock wool is a general term for products made mainly from natural rocks or steel slag such as blast furnace slag, and glass wool is a general term for cotton-like products made of glass fibers, both of which have fire resistance and flame retardancy.

In the following, a case will be described in which 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-proof cover 730; however, these materials are merely examples.
When this rock wool is used as the vibration insulator 720, it is preferable to use a sheet-shaped rock wool manufactured by papermaking. However, it is difficult to process the rock wool sheet manufactured by papermaking in this way into the three-dimensional shape (straight pipe section + reduced diameter section (tapered section)) of the pipe body 110 in 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 even in this case, the vibration insulator 720 in the present invention is preferably in the form of a sheet) without sewing or the like is set on the pipe body 110 by, for example, attaching it with tape, it may fall off in the event of a fire. For this reason, the developed shape (planar shape) of the rock wool sheet is, for example, as shown in FIG. 8 (A).

In this way, even if the floor slab S is thin, the slits can be made to appear only in one place in the vertical direction (up and down direction in the pipe body 110). Furthermore, in the development diagram of the rock wool sheet shown in Figure 8 (B), the slits are made to appear only in 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) the slits (five slits, more specifically, the fine grooves 722 described later) are made at the position of the floor slab S in the rock wool sheet, whereas in Figure 8 (B) the rectangle and the partial ring are joined by an arc. In the case of the development diagram shown in Figure 8 (A), the slits are 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 position is 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 in the event of a fire. In contrast, in the development of the rock wool sheet shown in FIG. 8(B), the joint shown by the dotted line is not at the floor slab S, and even if it is at the floor slab S, the joint may break at the joint and the rock wool sheet may fall in the event of a fire due to the short length of the joint and the heavy weight of the partial annular shape joined below. The shape of the vibration insulator 720 and the effects based on the shape will be described in detail later. In addition, the vibration insulator 820 is not necessarily used in the development of the rock wool sheet shown in FIG. 8(A), because the pipe body 210 and the drain pipe connection part 230 on which the vibration insulator 820 is provided in the drain pipe joint 200 are substantially straight pipe shapes and do not have a three-dimensional shape (straight pipe part + reduced diameter part (tapered part)) like the pipe body 110.

Furthermore, the vibration insulator 720 using this rock wool is provided so that it is fixed loosely and at several points in the circumferential direction, rather than fixed all around, in order to suppress noise propagation due to resonance with the inner layer vibration-damping material 714 or the thermally expandable fire-resistant sheet 712. In particular, the height positions of the several circumferential fixing positions where the rock wool is fixed (more specifically, where the rock wool is fixed to the EPDM rubber cover serving as the sound insulation 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 adhesives, double-sided tape, etc.

Below, a manufacturing method (not a construction method) for the drainage pipe fitting 100 having the outer layer member 700 with this three-layer structure or the drainage pipe fitting 200 having the outer layer member 800 will be described, which describes 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 the putty-like heat-expandable fire-resistant material 612. Then, the 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 a part of the putty-like heat-expandable fire-resistant material 612. Furthermore, the vibration-damping material 714 is attached to the outer peripheral surface of the pipe main body 110 or the drain pipe connection part 230 with an adhesive or a pressure-sensitive adhesive. At this time, the innermost layer 710 in this three-layer structure is either the heat-expandable fire-resistant sheet 712 or the vibration-damping material 714. Although not layered, in these drain pipe joints 100 and 200, a heat-expandable fire-resistant material 612 is present on the inner layer side of the heat-expandable fire-resistant sheet 712, filling the recess 112 or the recess 212.

After the thermally expandable fireproof sheet 712 and the vibration-damping material 714 are provided, a rock wool sheet (the development view of which is shown in FIG. 8(A)) as the vibration insulator 720 or a rock wool sheet (not shown in the development view, but rectangular) as the vibration insulator 820 is wrapped around it. Furthermore, from above, it is covered with an EPDM rubber cover as the sound insulation cover 730. Here, the EPDM rubber cover as the sound insulation cover 730 exhibits water stoppage, sound insulation, and vibration insulation properties. The EPDM rubber cover as the sound insulation cover 730 may be integrally molded and bonded to the drain pipe joint 100 or the drain pipe joint 200 to exhibit water stoppage, or it may be made to exhibit water stoppage only by tension (expressed by the elasticity of the rubber) without being bonded. In this case, as shown in the cross-sectional shapes in Figures 5 to 7 or Figures 13 to 14, it is preferable to provide an annular, thick upper end water stopper portion 732 at the upper end of the EPDM rubber cover serving as the soundproof cover 730 and/or a similarly annular, thick lower end water stopper portion 734 (although with a different diameter) at the lower end to enhance water stopper properties.

According to these drainage pipe joints 100 or 200, which have been outlined as above, they are formed of one or more resin injection moldings, and are provided to penetrate the floor slab S of a building, so that they can fully exert 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 provided as the innermost layer 710 in close contact with the outer surface of the pipe body 110 or the outer surface of the pipe body 210 and the drainage pipe connection part 230 to suppress vibration extremely effectively, and a vibration insulator 720, for example, a rock wool sheet, or a vibration insulator 820 (whose expanded shape is different from the vibration insulator 720) is provided as an intermediate layer, loosely and fixed at several points to exhibit sound absorption, fire resistance, sound insulation, and vibration insulation properties, and the outermost layer is provided as a vibration insulator 720. The 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 (for example, generated by hitting the swirl vane 114) caused by drainage flowing down the pipe body 110 or pipe body 210 and the drain pipe connection part 230 are suppressed by the vibration-damping material 714, and the vibrations are further blocked by the vibration insulator 720 or vibration insulator 820, and further, noise caused by the vibrations is blocked by the 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 the outside of them is configured to be covered with multiple layers including a layer that exhibits fire-resistant performance, so that fire-resistant performance can be fully exhibited.

Next, the drain pipe joint 100 or the drain pipe joint 200 will be described in more detail below. As with the overview above, please refer to Figures 1 to 8 for the drain pipe joint 100 and Figures 9 to 15 for the drain pipe joint 200. Also, 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.

<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 drain pipe joint 100 is integrally provided on at least a part of the outer peripheral surface of at least the part of the pipe body 110 that passes through the through hole of the floor slab S. It is not limited to being provided on the entire outer peripheral surface of the pipe body 110, and it may be provided only on a part of the outer peripheral surface of the pipe body 110 (as long as its position is on the floor slab S). In addition, the vibration-damping material 714 of the innermost layer 710 constituting the outer layer member 800 of the drain pipe joint 200 is integrally provided on at least a part of the outer peripheral surface of at least the part of the pipe body 210 that passes through the through hole of the floor slab S, and is also provided on the drain pipe connection part 230. It is not limited to being provided on the entire outer peripheral surface of the pipe body 210, and it may be provided only on a part of the outer peripheral surface of the pipe body 210 (as long as its position is on the floor slab S). Here, unlike in FIGS. 10 to 14, a vibration-damping material 714 is integrally provided in the pipe body 210 instead of the thermally expandable fireproof sheet 712 .

It is preferable that the vibration-damping material 714 is provided integrally by adhesion or bonding to the entire outer peripheral surface on which the vibration-damping material 714 is provided. 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 vibration-damping material 714, for example butyl rubber, as the innermost layer 710 by adhering it to at least a portion of the outer peripheral surface (outer surface) of the pipe body 110 or the outer peripheral surface (outer surface) of the pipe body 210 and the drain pipe connection portion 230, and integrating it with the drain pipe fitting, vibrations generated in the drain pipe fitting can be extremely effectively suppressed.

It is also preferable to provide a vibration insulator 720 or 820, such as rock wool, on the outer periphery of the vibration-damping material 714 to form a two-layer outer layer member, and it is also preferable to provide a sound-insulating cover 730, such as an EPDM rubber cover, on the outer periphery of the vibration insulator 720 or 820 to form a three-layer outer layer member. When adopting this three-layer structure, it is preferable to provide the vibration insulator 720 or 820 so that it is fixed to the sound-insulating cover 730 on the outer layer side, rather than to the vibration-damping material 714 on the inner layer side.

More specifically, in the drain pipe joint 100, the pipe body 110 has at least a straight pipe section 116 and a reduced diameter section 118 below the straight pipe section 116, and in this case, it is preferable that the vibration insulator 720 is fixed intermittently in the circumferential direction of the sound insulation cover 730 in the height range corresponding to the straight pipe section 116. Also, in the drain pipe joint 100 and the drain pipe joint 200, it is preferable that the vibration insulator 720 or the vibration insulator 820 is fixed by dots at two to four points in the circumferential direction of the sound insulation cover 730 on the outer layer side.

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

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

In this way, if the drain pipe joint 100 or the drain pipe joint 200 etc. burns, the heat will cause the thermally expandable fireproof sheet 712 to expand radially inward, crushing the hollow portion of the drain pipe joint 100 or the drain pipe joint 200 and blocking the drain pipe joint 100 or the drain pipe joint 200. In the event of a fire, the drain pipe structure using the drain pipe joint 100 or the drain pipe joint 200 can block the pipeline to prevent the flow of flames, smoke, etc.

In addition, in the drain pipe joint 100, the pipe body 110 has at least a straight pipe section 116 and a reduced diameter section 118 below the straight pipe section 116. In this case, a heat-expandable fire-resistant sheet 712 is provided on the inner layer side of the vibration insulator 720 in place of a portion of the vibration-damping material 714, and it is also preferable 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.

In this way, even if the drain pipe joint 100 or the like burns, the vibration insulator 720 is fixed to the outer layer sound insulation cover 730 at a height position corresponding to the straight pipe section 116 and above the height position of the drain pipe joint 100 blocked by the thermally expandable fireproof sheet 712, so that the vibration insulator 720 can be prevented from falling in the event of a fire.

<Sound insulation cover: Drainage pipe joints are not limited to those made of resin>
The outermost sound insulation cover 730 constituting the outer layer member 700 of the drainage pipe joint 100 is provided on the outer periphery of the 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 outermost sound insulation cover 730 constituting the outer layer member 800 of the drainage pipe joint 200 is provided on the outer periphery of the 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.

By providing the sound insulation cover 730, which is, for example, an EPDM rubber cover, around the outer periphery of the vibration insulator 720 or the vibration insulator 820 over the entire vertical length of the vibration insulator, high sound insulation performance can be achieved.
The sound insulation cover 730, which is an example of an EPDM rubber cover, has a water-stopping effect, a sound-insulating effect, and a vibration-insulating effect, and therefore can exhibit high water-stopping performance and high vibration-insulating performance in addition to the above-mentioned sound-insulating performance.

The soundproof cover 730 preferably has an upper end watertight portion 732 at its upper end and/or a lower end watertight portion 734 at its lower end, and the upper end watertight portion 732 and/or the lower end watertight portion 734 are provided so as to abut against the outer surface of the drain pipe joint 100 or the drain pipe joint 200 (including cases where they are abutted by being joined with an adhesive or the like). The upper end watertight portion 732 and the lower end watertight portion 734 are formed by a thick portion that is thicker than the main body of the soundproof cover 730. This allows for high watertight performance and also excellent strength.

In addition, this sound-proof cover 730 is integrally molded with a cover body having a length corresponding to the overall vertical length of vibration insulator 720 or vibration insulator 820, including upper end water-stopping portion 732 and/or lower end water-stopping portion 734, and it is preferable that sound-proof cover 730 itself be elastic.
When the sound-insulating cover 730 itself has elasticity in this manner, the elasticity of the sound-insulating cover 730 itself can be used to attach the cover to the outer periphery of the vibration insulator 720 or the vibration insulator 820 over the entire vertical length of the cover.

<Vibration insulator: Basically, drainage pipe joints are not limited to being made of resin, but a reduced diameter section is required>
In the drain pipe joint 100, the pipe body 110 at least comprises a straight pipe section 116 and a reduced diameter section 118 below the straight pipe section 116, and in this case, the vibration insulator 720 of the intermediate layer constituting the outer layer member 700 of the drain pipe joint 100 is provided on at least a part of the outer periphery of at least the portion of the pipe 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 Fig. 8(A) in the developed state (it may have the shape of the vibration insulator 726 shown in Fig. 8(B) here), and is provided by wrapping the edges of the sheet 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 fitting 100 has been installed in the building, when there are no attachments on the outer periphery of the vibration insulator 720, as shown in Figures 5 to 8, the vibration insulator 720 is not exposed to the upper floor side of the floor slab S, including the portions where the edges 720S1 or edges 726S1 shown in Figure 8(A) or Figure 8(B) abut, but is exposed to the lower floor side of the floor slab S with only one portion where the edges abut (the dotted line portion where the edges 720S2 or edges 726S2 shown in Figure 8(A) or Figure 8(B) abut).

Because of this, 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 edges 720S2 or the edges 726S2 abut each other) in the vertical direction (the vertical direction in the pipe body 110), so that the floor slab S does not burn, and because 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), there is no problem with the fire resistance of the vibration insulator 720, and it is possible to prevent it from falling off in the event of a fire.

More specifically, as shown in FIG. 8(A), the predetermined shape of the vibration insulator 720 is a partial annular shape, and from the outer circumference of the annular shape to the inner circumference of the annular shape, the length L(2) corresponds to the length L(1) of the vibration insulator 720 covered by the floor slab S, and the plurality of (here, five) narrow grooves 722 having a predetermined width are provided. The outer circumference side of the annular ring is above the pipe body 110. Each of the plurality of narrow grooves 722 is wound around the outer circumference of the straight pipe section 116 so as to close (so that the groove sides 722S forming each narrow groove 722 are abutted against each other, and so that the edges 720S1 of the sheets are abutted against each other), and the edges 720S2 of the sheets are abutted against each other and wound around the outer circumference of the reduced diameter section 118.

By wrapping the vibration insulator 720 as a sheet of such an expanded shape around the outer peripheral 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 paper-made rock wool sheet is used as the vibration insulator 720, although it is difficult to process the paper-made rock wool sheet 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.

<Thermal expansion fire-resistant material: Drainage pipe joints are basically limited to plastic>
In the drain pipe joint 100 or the drain pipe joint 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 drain pipe joints 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).

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

As described above, it is generally believed that a thermally expandable fire-resistant material has poor shape retention after expansion when its thermal expansion coefficient is high, and has good shape retention after expansion when its thermal expansion coefficient is low. As shown in Figures 15(A) and 15(B), a trade-off relationship is established in which a low thermal expansion coefficient may not provide sufficient fire resistance, and a low shape retention may cause the thermally expandable material to fall off. Taking these characteristics into consideration (utilizing the characteristics), two types of thermally expandable fire-resistant materials are selected according to their respective positions, weights, shapes, reaction speeds, and expansion start temperatures.

In terms of the characteristics of the shape of the thermally expandable fire-resistant material, between the putty-type and sheet-type employed in this embodiment, the putty-type thermally expandable fire-resistant material generally has a higher thermal expansion coefficient than the sheet-type thermally expandable fire-resistant material, as shown in Figure 15 (C).
Referring to FIG. 15(D), four examples of possible applications 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.

First, the second example shown in FIG. 15(D) corresponds to FIG. 15(A) and corresponds to the drain pipe joint 200 according to the second embodiment. Although the height positions are the same (here, the same means that there is no difference in the height direction that would require the placement of the heat-expandable fire-resistant material to be considered), when the radial positions are different, the thermal expansion coefficient of the heat-expandable fire-resistant material on the inner layer side in the radial direction is higher than the thermal expansion coefficient of the heat-expandable fire-resistant material on the outer layer side. More specifically, in the drain pipe joint 200, the heat-expandable fire-resistant material on the inner layer side is a putty-like heat-expandable fire-resistant material 612 filled in the recess 212, and the heat-expandable fire-resistant sheet 712 provided so as to be 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 side. Because 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 has a higher thermal expansion coefficient than the thermally expandable fire-resistant sheet 712 on the outer layer.

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 require consideration of 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 radial inner layer side, and a heat-expandable fire-resistant material with a low thermal expansion coefficient is arranged on the lower height side and the radial outer layer side.

Finally, the first example shown in FIG. 15(D) corresponds to the drain pipe joint 100 according to the first embodiment. In this case, two types of heat-expandable fire-resistant materials are provided at different positions in the vertical direction, so that normally, as shown in FIG. 15(B) (as in the third and fourth examples of FIG. 15(D)), the heat-expandable fire-resistant material with a high thermal expansion coefficient is placed at the upper side of the height position, and the heat-expandable fire-resistant material with a low thermal expansion coefficient is placed at the lower side of the height position. However, in the drain pipe joint 100, the putty-like heat-expandable fire-resistant material 612 filled in the recess 112 is used as the lower heat-expandable fire-resistant material, and the sheet-like heat-expandable fire-resistant sheet 712 is used as the upper heat-expandable fire-resistant material. Since the putty-like material has a higher thermal expansion coefficient than the sheet-like material, the lower heat-expandable fire-resistant material 612 has a higher thermal expansion coefficient than the upper heat-expandable fire-resistant sheet 712, which does not follow FIG. 15(B).

In the drain 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 to quickly block the reduced diameter section 118 with a small pipe diameter. On the other hand, since 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 that also has fire resistance and flame-proofing properties, and the shape of the reduced diameter section 118, which has a gradually decreasing pipe diameter, is held in place, thereby preventing the putty-like heat-expandable fire-resistant material 612 from falling off and compensating for the low shape stability.

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 sheet shape or a putty shape, or may be a combination of a sheet shape and a sheet shape, a putty shape and a putty shape, or a sheet shape and a putty shape. In addition, if two types of thermally expandable fire-resistant materials with different thermal expansion coefficients are used, the scope of the present invention does not include only two locations, but also a third type of thermally expandable fire-resistant material in a third location.

In addition to the examples of the arrangement of the heat-expandable fire-resistant material 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 the straight pipe section 116, two types of heat-expandable fire-resistant material are provided at different radial positions within the height range of the straight pipe section 116.
In addition, in another example, two types of heat-expandable fire-resistant materials having different thermal expansion coefficients are provided in the straight pipe section 116 and the reduced diameter section 118. For example, the drain pipe joint 100 is such an example.

In another example, the two types of heat-expandable fire-resistant materials having different thermal expansion coefficients are provided to have overlapping portions. For example, the drain pipe joint 200 is such an example.
Another example is that at least one of the two types of heat-expandable fire-resistant materials having different thermal expansion coefficients is provided at a position corresponding to the floor slab S. For example, the drain pipe joint 100 and the drain pipe joint 200 are such examples, and 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, and the hollow part of the drain pipe joint 100 or the drain pipe joint 200 can be quickly crushed and blocked.

As described above, such thermally expandable fire-resistant materials with different thermal expansion coefficients are preferably provided in either a sheet-like ring shape provided around the straight pipe section 116 of the drain pipe fitting 100, or in a putty-like filling shape provided by filling the recess 112 of the drain pipe fitting 100 or the recess 212 of the drain pipe fitting 200. Thus, vibration damping properties can be achieved by the sheet-like thermally expandable fire-resistant material provided in a ring shape and the putty-like thermally expandable fire-resistant material provided in a filling shape.

<How to install drainage pipe joints: Basically, drainage pipe joints are limited to plastic>
The construction method for placing and constructing a drainage pipe joint in a through hole in the floor slab S of a building will be described below.
The drain pipe joints preferably employed in this construction method further have the following structural features in the drain pipe joint 100 and the drain pipe joint 200. In the following, the drain pipe joint 100 will be described as a representative example.

This drainage pipe joint 100 is formed entirely from one or more resin injection-molded products, and when installed in a building, it is a drainage pipe joint that includes a pipe body 110 that is placed in the through hole of the floor slab S, an upper riser pipe connection part 120 that connects a drainage riser pipe 520 that protrudes above the floor slab S and allows drainage water to flow in from the upper floor, a drainage pipe connection part 130 that protrudes below the floor slab S and connects a drainage pipe (here, the drainage riser pipe 530) that allows drainage water to flow out to the lower floor, and a horizontal branch pipe connection part 140 that connects a drainage horizontal branch pipe 510 above the floor slab S. Further structural features include that the upper riser pipe connection part 120 or the horizontal branch pipe connection part 140 is formed of a transparent resin, a vibration-damping material 714 is provided integrally with the pipe body 110 on at least a portion of the outer circumferential surface of the pipe body 110, and the receiving part of the upper riser pipe connection part 120 or the receiving part of the horizontal branch pipe connection part 140 does not have a shield that prevents the transparent resin from being visible. Thus, before construction of this drainage pipe joint 100, the vibration-damping material 714 is integrally provided with the pipe body 110 on at least a portion of the outer circumferential surface of at least the portion of the pipe body 110 that passes through the through hole of the floor slab S, the upper riser pipe connection part 120 or the horizontal branch pipe connection part 140 is formed of transparent resin, and the receiving part of the upper riser pipe connection part 120 or the receiving part of the horizontal branch pipe connection part 140 does not have any obstruction that would prevent the transparent resin from being visible.

As shown in FIG. 5, in this drainage pipe joint 100, the upper riser pipe connection part 120 or the side branch pipe connection part 140 is formed of a transparent (including colorless transparent and colored transparent) resin, and the receiving part of the upper riser pipe connection part 120 or the receiving part of the side branch pipe connection part 140 is not provided with any shielding material that would prevent the transparent resin from being visible before construction. Note that here, before construction, vibration-damping material 714 is provided other than the receiving part of the upper riser pipe connection part 120 or other than the receiving part of the side branch pipe connection part 140, but these vibration-damping materials 714 may not be provided at all and may be installed later after construction.

The construction method of placing the drainage pipe fitting 100, which further has 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 side branch pipe 510 to the side branch pipe connection part 140 while visually checking (while checking) the fitting state between the side branch pipe connection part 140 and the drainage side branch pipe 510 through the transparent resin of the side branch pipe connection part 140.

Then, while visually checking (recognizing) the receiving portion of the transparent resin in this manner, the drainage rise pipe 520 is connected to the upper rise 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 the mortar M, a sound-insulating member is provided on the outer periphery of the upper riser pipe connection part 120 or the outer periphery of the side branch pipe connection part 140. This sound-insulating member is different from the sound-insulating cover 730 described above (including cases where they are the same, but basically), and is described as a general name having vibration-damping and/or vibration-insulating properties in addition to sound-insulating properties as the name suggests. As an example of such a sound-insulating member, the above-mentioned vibration-damping material 714 is provided at the receiving port part, a vibration insulator 720 represented by rock wool and/or a sound-insulating cover 730 formed of a rubber cover made of EPDM or the like is provided instead of/in addition to the vibration-damping material 714, or a vibration insulator made of glass wool different from rock wool and/or a sound-insulating cover formed of a cover made of vinyl chloride or the like is provided 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-proofing 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).

In this case, the soundproofing material may be installed so as to cover the outer periphery of the drainage pipe joint 100, or the soundproofing material may be installed so as to include glass wool as a sound-absorbing material and a polyvinyl chloride sound-insulating sheet as a sound-insulating cover, with the glass wool sound-absorbing material being fixed (including cases where it is fixed by sewing, adhesive, etc.) to the polyvinyl chloride sound-insulating cover on the outer layer side (rather than the vibration-damping material 714 on the inner layer side).

In this way, before the construction of the drainage pipe joint 100, the receiving portion of the upper riser pipe connection part 120 or the horizontal branch pipe connection part 140, which is made of transparent resin, does not have any shielding that would prevent the transparent resin from being visible, so the fitting state of the upper riser pipe connection part 120 and the drainage riser pipe 520 or the fitting state of the horizontal branch pipe connection part 140 and the horizontal drainage branch pipe 510 can be visually recognized through the transparent resin to connect the drainage pipe, thereby suppressing construction errors. In addition, since the sound insulation material containing rock wool, glass wool, etc. as a sound absorbing material is attached to the drainage pipe joint 100 after backfilling with mortar M, the outer diameter of the drainage pipe joint 100 does not increase when backfilling with mortar M, making it easy to backfill the mortar M, and also eliminating the possibility that moisture from the mortar M will splash onto the rock wool, glass wool, etc. and wet them.

In this way, the drain pipe connection of the drain pipe joint 100 is formed from transparent resin, and before construction, the construction of the drain pipe joint 100 is started in a state where the transparent resin of the receiving portion of the connection can be seen (a state where there is no obstruction that makes the transparent resin of the receiving portion invisible). Therefore, the connection state of the drain pipe joint 100 and other drain pipes can be visually confirmed while connecting, which reduces construction errors, and since a soundproofing material containing rock wool, glass wool, etc. as a sound absorbing material is provided after backfilling with mortar, it is easy to backfill with mortar M, and the possibility of wetting rock wool, glass wool, etc. due to moisture in mortar M can be eliminated. After construction of this drain pipe joint 100, as described above, drain vibration can be suppressed extremely effectively, fire resistance can be fully exerted, and high water stopping performance can be expressed.

<Modification>
In the above-described embodiment, the sound-proof cover 730 is formed containing a rubber-based material (such as EPDM (ethylene propylene diene rubber)), an elastomer-based material, or an olefin-based material (such as polyethylene resin) and has elasticity (stretchability), but the modified examples described below (modified examples 1 and 2 described below) are different in that the sound-proof cover is formed from a hard resin and has an elastic material (rubber gasket).

The sound insulation cover 730 constituting the outermost layer of the three-layered outer layer member in the drainage pipe joint in the above-mentioned embodiment is formed by containing a rubber-based, elastomer-based or olefin-based material, and has elasticity (elasticity), water-stopping properties, sound insulation properties and vibration insulation properties. When this sound insulation cover 730 is set on the drainage pipe joint (more precisely, when this sound insulation cover 730 is set on the main body side of the drainage pipe joint on which the two layers of vibration-damping material 714 and vibration insulator 720 provided on the pipe body are set), the main body side and the sound insulation cover are joined with an adhesive to stop water. The workability of setting this sound insulation cover 730 may not be favorable.

Although this is not a major problem with the drain pipe joint according to the embodiment described above, when setting this sound insulation cover 730, for example, adhesive is applied, and the sound insulation cover is stretched (increased inside diameter) using its elasticity to cover the drain pipe joint that does not include the sound insulation cover 730, and the sound insulation cover 730 is set to set, and the excess adhesive is wiped off, and it is confirmed that the adhesive has solidified and the sound insulation cover has been joined to the main body. Therefore, if the procedure is complicated or if it takes time for the adhesive to solidify, this setting operation may take time.

In contrast, the sound insulation cover of the drainage pipe joint in this modified example has a fixed shape because it does not have any stretchability (elasticity), and is set so that the sound insulation cover is placed over the drainage pipe joint that has nothing other than the sound insulation cover (it cannot be stretched because it has no stretchability (elasticity) and is not stretched), and an elastic material (rubber packing) is provided between the inner peripheral surface of the sound insulation cover and the outer surface of the drainage pipe joint. The sound insulation cover is joined to the drainage pipe joint via this elastic material (rubber packing) (without using adhesives, etc.), and the sound insulation cover in this way, which combines an elastic material (rubber packing) with the sound insulation cover body that does not have any stretchability, exhibits water stoppage, sound insulation, and vibration insulation properties.

Below, an overview of the two modified examples (Modification 1 in which an elastic material (rubber packing) is provided on the sound insulation cover side, and Modification 2 in which an elastic material (rubber packing) is provided on the drain pipe joint (main body) side) will be described. When describing matters common to the sound insulation cover 731 of the drain pipe joint 101 in Modification 1 and the sound insulation cover 741 of the drain pipe joint 103 in Modification 2, the sound insulation cover 730, which is the same as in the embodiment described above, may be used as a representative example.

The sound insulation cover (more specifically, sound insulation cover 731 or sound insulation cover 741) of the drain pipe fitting (more specifically, drain pipe fitting 101 or drain pipe fitting 103) in this modified example includes a non-elastic cover body (more specifically, sound insulation cover body 733 or sound insulation cover body 743) with a length corresponding to the overall vertical length of the vibration insulator 720, and is provided with an elastic material (rubber gasket) (more specifically, elastic material (rubber gasket) 735 or elastic material (rubber gasket) 745) only at the upper end or at the upper end and lower end (here, not only the upper end but the upper end and lower end) between the cover body and the outer surface of the drain pipe fitting. Here, the elastic material (rubber packing) provided at the upper end functions as an upper end water stopper, and the elastic material (rubber packing) provided at the lower end functions as a lower end water stopper. The sound insulation cover abuts against the outer surface of the drainage pipe joint via the elastic material (rubber packing) to provide water stopper properties, and by combining the elastic material (rubber packing) with the sound insulation cover body, which does not have elasticity, the sound insulation cover provides sound insulation and vibration insulation properties in addition to water stopper properties.

Here, the elastic material (rubber gasket) is provided on the inner peripheral surface of the sound insulation cover main body (sound insulation cover main body 733) or the outer surface of the drainage pipe joint (lower part 905 of the water collection chamber of the horizontal branch pipe connection portion 140).
Moreover, the cover body (sound-insulating cover body 733 or sound-insulating cover body 743) is preferably made of a hard resin.

As shown in Modification 1 (as shown in Figures 16 and 17), it is preferable that the sound insulation cover (sound insulation cover 731) abuts against the outer surface of the drainage pipe joint via a ring-shaped elastic member (rubber ring) 900 that is elastic and corresponds to the outer diameter of the drainage pipe joint (more specifically, the outer diameter of the lower part 905 of the water collection chamber of the horizontal branch pipe connection part 140). This embodiment can also be applied to Modification 2 (it is just illustrated in Modification 1 and not in Modification 2).

In the above embodiment, the vibration insulator 720 is preferably fixed intermittently in the circumferential direction of the sound insulation cover 730 in the height range corresponding to the straight pipe section 116, and it has been explained that the vibration insulator 720 is preferably fixed in two to four places in the circumferential direction of the outer layer sound insulation cover 730 by dot-fixing, but instead, it is also preferable to fix it as follows. The vibration insulator 720 is preferably fixed to the outer layer sound insulation cover by being fixed continuously or intermittently around one circumference of the outer side of the vibration insulator 720 at at least one place in the height direction of the outer layer sound insulation cover 730.

The following provides a more detailed explanation (partly divided into Variation 1 and Variation 2) of the sound-proof cover and the elastic material, as well as the construction method of the drainage pipe joint.
Here, the elastic material (rubber packing) may be provided on the sound insulation cover side (Modification 1 described later) or on the drain pipe joint (main body) side (Modification 2 described later), but regardless of these differences, the elastic material (rubber packing) constitutes a part of the sound insulation cover. Details will be described later, but the sound insulation cover 731 in the drain pipe joint 101 according to Modification 1 is composed of a sound insulation cover main body 733 and an elastic material (rubber packing) 735, and the elastic material (rubber packing) 735 is provided on the inner peripheral surface of the sound insulation cover main body 733, and the sound insulation cover 741 in the drain pipe joint 103 according to Modification 2 is composed of a sound insulation cover main body 743 and an elastic material (rubber packing) 745, and the elastic material (rubber packing) 745 is provided on the outer peripheral surface of the drain pipe joint 103. Furthermore, in both modified examples, the elastic material (rubber packing) is provided only at the upper end or at the upper end and lower end between the cover body and the outer surface of the drain pipe joint, and water stopping properties are exhibited as described above. And, by configuring the sound insulation cover in this manner in this modified example (i.e., by configuring the sound insulation cover to include the elastic material (rubber packing)), the sound insulation cover 731 or the sound insulation cover 741 in this modified example also exhibits water stopping properties, sound insulation properties, and vibration insulation properties, similar to the sound insulation cover 730 in the above-mentioned embodiment.

The drain pipe joint according to the modified examples (Modification 1 and Modification 2) described in detail below differ in that the sound insulating cover of the drain pipe joint according to the embodiment described above is made of a hard resin material, whereas the sound insulating cover of the drain pipe joint according to the embodiment described above is made of a rubber-based material having elasticity (stretchability). As described above, the sound insulating cover is also different in that it is made of a ring elastic material (rubber ring) 900, but this ring elastic material (rubber ring) 900 can also be used in the embodiment described above. Other structures that are the same as those in the embodiment described above are given the same reference numerals as in the embodiment described above. The explanation of these structures will not be repeated here as they overlap with the explanation described above.

Here, typical examples of hard resins used as the cover body (sound insulation cover body) of the sound insulation cover in the drainage pipe joint according to the modified example include polyvinyl chloride and polyethylene. Furthermore, it is also preferable to form such hard resins from resin materials such as olefin-based materials (resin compositions containing 300 to 600 parts by weight of inorganic filler per 100 parts by weight of olefin-based resin).

Inorganic fillers include, but are not limited to, silica, diatomaceous earth, alumina, zinc oxide, titanium oxide, calcium oxide, magnesium oxide, iron oxide, tin oxide, antimony oxide, ferrites, calcium hydroxide, magnesium hydroxide, aluminum hydroxide, basic magnesium carbonate, calcium carbonate, magnesium carbonate, zinc carbonate, barium carbonate, dawnnite, hydrotalcite, calcium sulfate, barium sulfate, gypsum fiber, calcium silicate, talc, clay, mica, montmorillonite, bentonite, activated clay, sepiolite, imogolite, sericite, glass fiber, glass beads, silica-based balloon, aluminum nitride, boron nitride, silicon nitride, carbon black, graphite, carbon fiber, carbon balloon, charcoal powder, various metal powders, potassium titanate, magnesium sulfate, lead zirconate titanate, aluminum borate, molybdenum sulfide, silicon carbide, stainless steel fiber, zinc borate, various magnetic powders, slag fiber, fly ash, dewatered sludge, etc.

Among these, calcium carbonate is preferably used as the inorganic filler in terms of the balance between weight and cost. These may be used alone or in combination of two or more.
The olefin resin is not particularly limited, but examples thereof include low-density polyethylene, high-density polyethylene, linear low-density polyethylene, atactic polypropylene, isotactic polypropylene, syndiotactic polypropylene, and poly-α-olefin.
Furthermore, it may be formed of a material other than an olefin-based material, such as polyvinyl chloride resin (as mentioned above), polystyrene resin, ABS resin, AS resin, elastomer material, or the like.
In the following modified examples, the hard resin used for the sound-insulating cover body of the sound-insulating cover will be described as being polyvinyl chloride.

Here, the material used as the elastic material (rubber packing) constituting part of the sound insulation cover in the drainage pipe joint according to the modified example is a rubber material that can be generally used as a so-called packing, and representative examples include EPDM (ethylene propylene diene rubber) and SBR (styrene butadiene rubber). In addition to these, thermoplastic elastomers and polyethylene foams can also be used.
In the following modified examples, the rubber material used as the elastic material (rubber packing) of the sound insulation cover will be described as EPDM (ethylene propylene diene rubber).
The material used for the ring elastic material (rubber ring) is not limited, but may be the same material as the elastic material (rubber packing) described above.

<Modification 1: Elastic material (rubber packing) on the soundproof cover side>
The drain pipe joint 101 according to the modified example 1 will be described in detail with reference to Figures 16 and 17. Figure 16 is a cross-sectional view showing a drain pipe structure in which the drain pipe joint 101 according to the modified example 1 is adopted, and Figure 17 is a view for explaining a state in which a sound insulation cover 731 (more precisely, a sound insulation cover 731 consisting of a sound insulation cover main body 733 and an elastic material (rubber packing) 735, and further, optionally, a vibration insulator 720) is set in the drain pipe joint 101 of Figure 16 (for example, not at a construction site but at a manufacturing factory for the drain pipe joint 101).

As shown in these figures, the sound insulation cover 731 provided in the drain pipe joint 101 according to this modification includes a sound insulation cover main body 733 that does not have elasticity and has a length corresponding to the entire vertical length of the vibration insulator 720, and has an elastic material (rubber packing) 735 only at the upper end or at the upper end and lower end between the sound insulation cover main body 733 and the outer surface of the drain pipe joint 101. In these figures, the elastic material (rubber packing) 735 is provided at both ends of the upper end and the lower end between the sound insulation cover main body 733 and the outer surface of the drain pipe joint 101, but it may be provided only at the upper end. This elastic material (rubber packing) 735 can realize the water stoppage, sound insulation, and vibration insulation properties of the drain pipe joint 101 (similar to the above-mentioned embodiment, although the material of the sound insulation cover main body is different from that of the above-mentioned embodiment). Here, in the case where the elastic material (rubber packing) 735 is provided on the sound insulation cover main body 733 to form the sound insulation cover 731 as in this modified example (more specifically, in the case where a manufacturing method is adopted in which the sound insulation cover 731 (sound insulation cover main body 733 + elastic material (rubber packing) 735) is set on the drain pipe joint (main body) or a construction method is adopted in which the sound insulation cover 731 (sound insulation cover main body 733 + elastic material (rubber packing) 735) is set in a through hole and then the drain pipe joint (main body) is installed), the elastic material (rubber packing) 735 is provided (so as to be fitted into the recess) in the recess (more specifically, the upper recess 733DU and the lower recess 733DD) in the inner peripheral surface of the sound insulation cover main body 733 of the sound insulation cover. Here, with regard to these two recesses, if the elastic material (rubber packing) 735 is provided only on the upper side, the sound insulation cover main body 733 does not need to be provided with the lower recess 733DD. As shown in FIG. 17, this elastic material (rubber packing) 735 has a return part with a cross-section shaped like a square to make it easier to insert the drain pipe joint 101 other than the sound insulation cover 731 from above the sound insulation cover 731 and to prevent it from returning midway.

In this modified example, the elastic material (rubber gasket) 735 is provided on the inner surface of the sound-proof cover main body 733, which differs from the drain pipe fitting 103 in modified example 2 in which the elastic material is provided on the outer surface of the drain pipe fitting.
As described above, although not limited thereto, the sound-insulating cover main body 733 is made of hard resin.

In order for the drain pipe joint 101 according to this modified example to have such a configuration, the outer layer member 701 has a three-layer structure, and is provided on the outer surface of the pipe body 110 in the following order from the outer surface of the drain pipe joint 101 (however, the elastic material (rubber packing) 735 constituting the outermost sound insulation cover 731 abuts against the outer surface of this drain pipe joint 101, so that the sound insulation cover 731 has a portion that becomes the innermost layer, which is ignored because the abutment area of the elastic material (rubber packing) 735 is small), the vibration damping material 714 (or the heat-expandable fireproof sheet 712), the vibration insulator 720 formed from fire-resistant inorganic fibers, and the sound insulation cover 731 (sound insulation cover body 733 and elastic material (rubber packing) 735).

In this way, in the drain pipe joint 101 of this modified example, the elastic material (rubber packing) 735 is provided on the inner surface of the sound insulation cover body 733 of the sound insulation cover 731 (more specifically, the upper recess 733DU and the lower recess 733DD), so the sound insulation cover 731 (more precisely, the sound insulation cover body 733 and the elastic material (rubber packing) 735 constituting the sound insulation cover 731, and optionally, the vibration insulator 720) is set to the drain pipe joint 101 (more precisely, other than the sound insulation cover body 733 and the elastic material (rubber packing) 735 constituting the sound insulation cover 731, and the vibration insulator 720).

17, the soundproof cover 731 abuts against the outer surface of the drain pipe joint 101 via a ring-shaped elastic material (rubber ring) 900 having elasticity corresponding to the outer diameter of the drain pipe joint 101. The connection between the horizontal branch pipe connection part 140 and the pipe body 110 in this drain pipe joint 101 is such that the horizontal branch pipe connection part 140 is fitted into the pipe body 110 (the inner peripheral surface of the fitting part 902 of the pipe body 110 and the outer peripheral surface of the fitting part 904 of the horizontal branch pipe connection part 140 are joined), so that a step is generated between the outer peripheral surface of the horizontal branch pipe connection part 140 and the outer peripheral surface of the pipe body 110, where the pipe body 110 side protrudes, as shown by the hollow triangle mark in FIG. When this step occurs, as shown in FIG. 17, when setting the sound insulation cover 731 (more precisely, the sound insulation cover 731 plus, optionally, the vibration insulator 720) to the drain pipe joint 101 (more precisely, other than the sound insulation cover 731 and the vibration insulator 720), it may be difficult to set the sound insulation cover 731 due to the step. For this reason, in order to eliminate this step, a ring elastic material (rubber ring) 900 is provided on the outer periphery of the water collection chamber lower part 905 of the horizontal branch pipe connection part 140, and the step is eliminated as shown by the filled triangle and the open triangle.

This ring elastic material (rubber ring) 900 has an inner diameter corresponding to the outer diameter of the fitting portion 904 of the horizontal branch pipe connection portion 140 (= the outer diameter of the lower part of the water collection chamber 905), and its thickness (outer diameter) corresponds to the outer diameter of the fitting portion 902 of the pipe main body 110. When this ring elastic material (rubber ring) 900 is set in the fitting portion 904 of the horizontal branch pipe connection portion 140, the outer diameter of the ring elastic material (rubber ring) 900 is in the position indicated by the filled-in triangle mark and becomes approximately equal to the outer diameter of the fitting portion 902 of the pipe main body 110 indicated by the filled-in triangle mark, thereby eliminating the above-mentioned step and improving the workability of setting the sound-insulating cover 731 (more precisely, the sound-insulating cover 731 plus, optionally, the vibration insulator 720) to the drainage pipe fitting 101 (more precisely, other than the sound-insulating cover 731 and the vibration insulator 720).
This ring elastic material (rubber ring) 900 can be preferably applied not only to the two modified examples, but also to cases where the sound-insulating cover body is made of a rubber-based material such as EPDM (i.e., all of the drainage pipe joints related to the embodiments described above).

In all the above-mentioned embodiments, the vibration insulator 720 is fixed to the outer layer side sound insulation cover 730 at two to four points in the circumferential direction by dot-fixing, but the present invention is not limited to this. For example, in the drainage pipe joints according to all the above-mentioned embodiments and in the drainage pipe joints according to all the modified examples (modification example 1, modification example 2), the vibration insulator 720 may be fixed to the outer layer side sound insulation cover by being fixed continuously or intermittently around one circumference of the outer side of the vibration insulator 720 at at least one point in the height direction of the outer layer side sound insulation cover. In this way, vibration insulator 720, an example of which is a rock wool sheet, is provided as an intermediate layer, loosely and the outermost circumference is fixed continuously or intermittently to the sound insulating cover on the outer layer side rather than to vibration damping material 714 on the inner layer side, thereby exhibiting 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 properties, and vibration insulation properties, and sound insulating cover 730, an example of which is a rubber (soft) cover made of EPDM, or sound insulating cover 731, an example of which is a hard cover made of polyvinyl chloride (sound insulating cover main body 733 and elastic material (rubber packing) 735), is provided as the outermost layer to exhibit water stoppage, sound insulation properties, and vibration insulation properties, thereby making it possible to extremely effectively suppress vibrations generated in the drainage piping joint.
As described above, the drainage pipe joint 101 according to this modified example can also achieve the same effects as the drainage pipe joint according to the above-described embodiment.

<Modification 2: Elastic material (rubber packing) on the drain pipe joint (main body) side>
The drain pipe joint 103 according to the modified example 2 will be described in detail with reference to Figures 18 and 19. Figure 18 is a cross-sectional view showing a drain pipe structure in which the drain pipe joint 103 according to the modified example 2 is adopted, and Figure 19 is a view for explaining a state in which a sound insulation cover 741 (more precisely, only the sound insulation cover main body 743) is set in the drain pipe joint 103 of Figure 18 (for example, not at a construction site but at a manufacturing factory for the drain pipe joint 103).

The drain pipe joint 101 according to the first modification and the drain pipe joint 103 according to the second modification are different in that the drain pipe joint 101 has an elastic material (rubber packing) 735 on the inner peripheral surface of the sound insulation cover body 733 of the sound insulation cover 731, whereas the drain pipe joint 103 has an elastic material (rubber packing) 745 on the outer peripheral surface (more specifically, the lower water collection chamber 905 of the horizontal branch pipe connection part 140) of the drain pipe joint 103 (not on the sound insulation cover body 743 of the sound insulation cover 741). The other configurations of the drain pipe joint 103 according to this modification are the same as those of the drain pipe joint 101 according to the first modification described above, so detailed description will not be repeated here. Note that in the drain pipe joint 103 according to this modification, the ring elastic material (rubber ring) 900 is not shown because it is an optional requirement in the present invention (basically unnecessary).

In order for the drain pipe joint 103 according to this modified example to have such a configuration, the outer layer member 703 has a three-layer structure, and is provided on the outer surface of the pipe body 110 in the following order from the outer surface of the drain pipe joint 103 (however, the elastic material (rubber packing) 745 constituting the outermost sound insulation cover 741 abuts against the outer surface of this drain pipe joint 103, so that the sound insulation cover 741 has a portion that is the innermost layer, but this is ignored because the abutment area of the elastic material (rubber packing) 745 is small), the vibration damping material 714 (or the heat-expandable fireproof sheet 712), the vibration insulator 720 formed from fire-resistant inorganic fibers, and the sound insulation cover 741 (the elastic material (rubber packing) 745 provided on the sound insulation cover body 743 and the outer surface of the drain pipe joint 103).

In this way, in the drain pipe fitting 103 of this modified example, since the elastic material (rubber gasket) 745 is provided on the outer peripheral surface of the drain pipe fitting 103, the sound-insulating cover 741 (more precisely, only the sound-insulating cover main body 743 of the sound-insulating cover 741) is set on the drain pipe fitting 103 (more precisely, other than the sound-insulating cover main body 743 of the sound-insulating cover 741).
In this manner, the drainage pipe joint 103 according to this modified example can also achieve the same effects as the drainage pipe joint according to the above-described embodiment.

<Construction methods of modified example 1 and modified example 2>
A brief description will be given of a construction method for the drainage pipe joint 101 according to Modification 1 and a construction method for the drainage pipe joint 103 according to Modification 2 with reference to Figures 20 and 21. This construction method is not the manufacturing method for the drainage pipe joint in the manufacturing factory for the drainage pipe joint shown in Figures 17 and 19, but is a construction method for installing the drainage pipe joint in a through hole opened in the floor slab S of a building which is the construction site for the drainage pipe joint.

A distinctive feature of this construction method is that the sound-insulating cover is set in the through hole of the floor slab S, the sound-insulating cover is embedded in the floor slab S with a filler M such as mortar, and then the drainage pipe fittings other than the sound-insulating cover are set in the embedded sound-insulating cover.
The construction method of the drainage pipe joint according to the present invention may be a (conventional, ordinary) construction method in which the drainage pipe joint with the sound-insulating cover set (i.e., the drainage pipe joint completed including the sound-insulating cover) is set in the through hole of the floor slab S, and the drainage pipe joint is embedded in the floor slab S with a filler M such as mortar. That is, the construction is performed by setting the sound-insulating cover (at a drainage pipe joint manufacturing factory, etc.) as shown in Fig. 17 and completing the drainage pipe joint 101 as shown in Fig. 16, and then setting the completed drainage pipe joint 101 in the through hole of the floor slab S and embedding the drainage pipe joint 101 in the floor slab S with a filler M such as mortar, or by setting the sound-insulating cover (at a drainage pipe joint manufacturing factory, etc.) as shown in Fig. 19 and completing the drainage pipe joint 103 as shown in Fig. 18, and then setting the completed drainage pipe joint 103 in the through hole of the floor slab S and embedding the drainage pipe joint 103 in the floor slab S with a filler M such as mortar.

In the drainage pipe joint 101 according to the first modified example, as shown in FIG. 20, the sound insulation cover 731 (more precisely, the sound insulation cover 731 consisting of the sound insulation cover main body 733 and the elastic material (rubber packing) 735, and optionally the vibration insulator 720) is set in the through hole of the floor slab S and embedded in the floor slab S with a filler M such as mortar, and then the drainage pipe joint 101 (more precisely, other than the sound insulation cover 731 and the vibration insulator 720) is set in the embedded sound insulation cover 731 (more precisely, the sound insulation cover 731 plus, optionally, the vibration insulator 720).

In the drainage pipe joint 103 according to the second modified example, as shown in FIG. 21, the sound insulation cover 741 (more precisely, only the sound insulation cover body 743) is set in the through hole of the floor slab S and the sound insulation cover 741 is embedded in the floor slab S with a filler M such as mortar, and then the drainage pipe joint 101 (more precisely, everything other than the sound insulation cover body 743 of the sound insulation cover 741) is set in the embedded sound insulation cover 741 (more precisely, only the sound insulation cover body 743 of the sound insulation cover 741).

In this way, the sound insulation cover is first embedded in the through hole of the floor slab S, and then the drainage pipe joints other than the sound insulation cover are inserted from above the sound insulation cover to be integrated. For this reason, when the void pipe is fixed vertically to the floor base before concrete is poured for the floor slab S, concrete is poured around it to create a concrete floor, and the cavity formed inside the void pipe is used as the through hole, it was usually necessary to pull out the paper, resin or metal void pipe after curing (metal void pipes may not be pulled out) and fill the gap between the through hole and the drainage pipe joint with a filler, but if a sound insulation cover is used instead of such a void pipe (if the sound insulation cover is fixed vertically to the floor base before concrete is poured for the floor slab S, and concrete is poured around it to create a concrete floor), it is preferable in that the work of filling the gap between the through hole and the drainage pipe joint with a filler is unnecessary (and also in that the work of pulling out the void pipe is unnecessary since a void pipe is not used in the first place). In this case, it is preferable that the length of the soundproof cover is equal to or shorter than the thickness of the slab (so as not to interfere with on-site work of pouring concrete around the soundproof cover).

Furthermore, when carrying out construction in this manner, when updating the drainage pipe joints, it is preferable that only the sound-insulating cover can be left in the through hole of the floor slab S, and everything other than the sound-insulating cover can be updated.
Here, in order to shorten the construction period, it is also possible to cast the drainage pipe joint in advance into the PC board at the PC board manufacturing factory where the PC (precast concrete) board is manufactured. In this case, it is assumed that the drainage pipe joint is directly filled into the PC board at the PC board manufacturing factory, rather than first opening a through hole in the floor slab S, installing the drainage pipe joint in the through hole, and filling the gap (the gap between the through hole and the drainage pipe joint) with a filler. Based on this assumption, it is possible to directly fill (cast) the sound insulation cover in the PC board in advance, similar to using the sound insulation cover instead of the void pipe described above. In other words, since the gap between the drainage pipe joint and the through hole in the floor slab is not filled with a filler, in the modified example of the present invention, filling the gap with a filler may not be a mandatory requirement in the construction method. Even in this case, as described above, it is preferable that the length of the sound insulation cover is the same as or shorter than the thickness of the slab (here, the thickness of the PC board) (in terms of not interfering with the PC board manufacturing work of pouring concrete around the sound insulation cover).

As mentioned above, the present invention does not exclude the construction of a drainage pipe joint in the floor slab S by inserting the drainage pipe joint shown in Figures 16 and 18, which is completed including the soundproof cover and is set (completed as a drainage pipe joint) as shown in Figures 17 and 19, into the through hole of the floor slab S without first embedding any of the components that make up the drainage pipe joint in the floor slab S, and filling the space between the outer periphery of the drainage pipe joint (here, the outermost periphery is the soundproof cover) and the inner periphery of the through hole with a filler M such as mortar.

It should be noted that the embodiments disclosed herein are illustrative in all respects and are not restrictive. The scope of the present invention is indicated by the claims rather than the above description, and is intended to include all modifications within the meaning and scope of the claims.

The present invention is preferable for a drainage pipe joint that is installed by penetrating the floor slab S of a building, and is particularly preferable for a drainage pipe joint that is installed by penetrating the floor slab of a building, in that it can exhibit optimal vibration control performance, vibration insulation performance, and sound insulation performance.

100, 200 Drain pipe joint 110, 210 Pipe body 112, 212 Depression 114 Swirl vane 120 Upper rise pipe connection part 130, 230 Drain pipe connection part 140 Horizontal branch pipe connection part 142 Water collection chamber 144, 146, 148 Horizontal branch pipe connection member 520 (upper floor side) Drain stand pipe 530 (lower floor side) Drain stand pipe 540 (lower floor side) 90 degree (compact) vent pipe 612 Thermally expandable fireproof material 700, 800 Outer layer member 710 Innermost layer 712 Thermally expandable fireproof sheet 714 Vibration damping material 720, 820 Vibration insulator (formed by fire-resistant inorganic fiber) 730 Sound insulation cover

Claims (13)

A drainage piping joint comprising: a pipe body that is placed in a through hole of a floor slab when installed in a building; an upper riser pipe connection portion that protrudes above the floor slab and connects a drainage riser pipe that allows drainage water to flow in from an upper floor; a drainage pipe connection portion that protrudes below the floor slab and connects a drainage pipe that allows drainage water to flow out to a lower floor; and a horizontal branch pipe connection portion that connects a horizontal drainage branch pipe above the floor slab,
a vibration-damping material provided integrally on at least a part of an outer circumferential surface of at least a portion of the pipe body passing through the through hole ;
A vibration insulator is provided on the outer periphery of the vibration-damping material,
A sound insulating cover is provided on the outer periphery of the vibration insulator,
The pipe body includes at least a straight pipe portion and a reduced diameter portion below the straight pipe portion,
A drainage pipe joint , characterized in that the vibration insulator is intermittently fixed to the sound-insulating cover in a circumferential direction within a height range corresponding to the straight pipe section . The drainage pipe joint according to claim 1, characterized in that the vibration-damping material is adhered or bonded to the entire surface of the outer periphery on which the vibration-damping material is provided. The drainage pipe joint according to claim 1 or 2, characterized in that the vibration-damping material is formed in a sheet shape and wrapped around the outer peripheral surface. 4. The drainage pipe joint according to claim 1, wherein the vibration insulator is fixed to the sound-insulating cover on the outer layer side. The drainage pipe joint according to any one of claims 1 to 4 , characterized in that the vibration insulator is fixed by point fixing at two to four points in the circumferential direction of the sound-insulating cover on the outer layer side. The drainage pipe joint is formed of one or more resin injection moldings,
A drainage pipe joint as described in any one of claims 1 to 5 , characterized in that it has a portion in which a sheet-shaped heat-expandable fire-resistant material is provided on the outer peripheral surface in place of at least a portion of the vibration-damping material. The drainage pipe joint is formed of one or more resin injection moldings ,
A drainage pipe joint as described in any one of claims 1 to 5, characterized in that a heat-expandable fire-resistant material is provided on the inner layer side of the vibration insulator in place of a portion of the vibration-damping material, and the vibration insulator is fixed to the sound-insulating cover on the outer layer side at a position above the heat-expandable fire - resistant material and at a height position corresponding to the straight pipe section. The drainage pipe joint according to any one of claims 1 to 7, characterized in that the vibration-damping material is formed containing a butyl-based or asphalt-based material, and the sound-insulating cover is formed containing a rubber-based, elastomer-based or olefin- based material. The sound-insulating cover includes a non-elastic cover body having a length corresponding to the overall length of the vibration insulator in the vertical direction,
The drainage pipe joint according to any one of claims 1 to 8, characterized in that an elastic material is provided only at the upper end, or at the upper end and the lower end, between the cover body and the outer surface of the drainage pipe joint. The drainage pipe joint according to claim 9 , wherein the elastic material is provided on an inner peripheral surface of the cover body or an outer surface of the drainage pipe joint. 11. The drainage pipe joint according to claim 9 or 10 , wherein the cover body is made of a hard resin. The drainage pipe joint according to any one of claims 1 to 8, characterized in that the sound-proof cover abuts against the outer surface of the drainage pipe joint via a ring- shaped elastic material having elasticity corresponding to the outer diameter of the drainage pipe joint. A drainage pipe fitting as described in any one of claims 1 to 12, characterized in that the vibration insulator is fixed to the sound-insulating cover on the outer layer side by continuously or intermittently fixing one circumference of the vibration insulator at least at one point in the height direction of the sound-insulating cover on the outer layer side.

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