JP7465708B2 - Drainage pipe joint and manufacturing method thereof - Google Patents

Description

The present invention relates to a drainage pipe joint that is installed by penetrating the floor slab of a building, and in particular to a drainage pipe joint that exhibits optimal vibration control performance, vibration insulation performance, and sound insulation performance, and has a suitable structure for exhibiting these performances (particularly a structure related to vibration 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, this type of drainage piping joint comprises a pipe body that is placed in the through hole of the floor slab, an upper riser connection portion that protrudes above the floor slab and connects a drainage riser pipe that allows drainage water to flow in from the upper floor, a lower riser connection portion 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 portion that connects a drainage horizontal branch pipe above the floor slab.

For drain pipes, including these drain pipe joints, that are installed through the floor slab, various measures have been proposed to prevent so-called structure-borne noise, in which drain vibrations are transmitted to the floor slab and radiated into the room. In addition, in preventing such structure-borne noise, it is necessary to improve the workability when installing a cover around the drain pipe.
As an example of such a technology, JP 2019-183422 A (Patent Document 1) discloses a sound insulation structure for a collective joint that includes a sound-insulating cover that includes a pipe body formed from a sound-insulating material and a sheet body formed from a sound-absorbing material that is attached to the inner surface of the pipe body in a tubular shape, the sound insulation structure including a cushioning material that is fixed to the outer circumferential surface of the collective joint and disposed between the outer circumferential surface of the collective joint and the inner circumferential surface of the pipe body, and that separates the outer circumferential surface of the collective joint from the inner circumferential surface of the pipe body.

Furthermore, paragraphs 0046 and 0051 of this patent document contain the following description.
The sheet body 32 is made of a sound absorbing material. The sound absorbing property of the sound absorbing material is higher than that of the sound insulating material. The sheet body 32 is made of a porous material, for example, glass wool, rock wool, felt, urethane foam, polyethylene foam, polypropylene foam, etc. Among these, glass wool is preferable for the sheet body 32 in terms of fire resistance, sound insulation, vibration isolation, and cost.

JP 2019-183422 A

The above-mentioned Patent Document 1 discloses that glass wool is suitable as a sheet body from the standpoint of fire resistance, sound insulation, vibration damping, and cost, and discloses a structure in which a sheet body 32 as shown in Figure 6 is deformed (rolled) so that a pair of first peripheral edges 40 and a pair of second peripheral edges 41 butt against or overlap each other, and then fixed to the outer circumferential surface of a collective joint.
However, if rock wool is used instead of the glass wool disclosed in Patent Document 1, the rock wool sheet cannot be sewn if it is manufactured by papermaking, and if the rock wool sheet is simply set in the shape described above, for example, without sewing, the rock wool sheet will fall in the event of a fire.

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 in particular, to provide a drainage pipe joint that exhibits optimal vibration control performance, vibration insulation performance, and sound insulation performance, and that has a suitable structure for exhibiting these performances (particularly a structure related to vibration insulation performance).

In order to achieve the above object, the drainage pipe joint according to the present invention employs the following technical measures.
That is, the drainage pipe joint according to the present invention is a drainage pipe joint that includes a pipe main 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 introduces drainage water from an upper floor, a drainage pipe connection portion that protrudes below the floor slab and connects a drainage pipe that outputs drainage water to a lower floor, and a horizontal branch pipe connection portion that connects a drainage horizontal branch pipe above the floor slab, and the pipe main body includes at least a straight pipe portion and a reduced diameter portion below the straight pipe portion, and the pipe main body includes a straight pipe portion that passes through at least the through hole of the pipe main body. a vibration insulator is provided on at least a portion of the outer periphery of the section, the vibration insulator being a sheet having a predetermined shape when unfolded, the edges of the sheet being abutted against each other and wrapped around the outer periphery of the straight pipe section and the outer periphery of the reduced diameter section, and after the drainage pipe fitting has been installed in the building and there is no attachment on the outer periphery of the vibration insulator, the vibration insulator is exposed to the lower floor side of the floor slab with only one part where the edges abut against each other, without being exposed to the upper floor side of the floor slab.

Preferably, the predetermined shape is a partial annular shape, and from the outer circumference of the annular shape toward the inner circumference of the annular shape, a number of narrow grooves having a predetermined width corresponding to the length of the vibration insulator covered by the floor slab are provided, and the outer circumference side of the annular shape is above the pipe body, and the groove sides that form the narrow grooves are abutted to close each of the multiple narrow grooves so as to be wound around the outer circumference of the straight pipe section, and the edges of the sheet are abutted against each other so as to be wound around the outer circumference of the reduced diameter section.

More preferably, the sheet can be configured to be a paper-made rock wool sheet.
More preferably, a sound insulating cover is provided on the outer periphery of the vibration insulator, and the vibration insulator can be configured so as to be fixed to the sound insulating cover on the outer layer side.
More preferably, the vibration insulator may be configured to be fixed intermittently in the circumferential direction of the sound insulation cover in a height range corresponding to the straight pipe portion.

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 drain pipe fitting can be formed from one or more injection-molded resin products, and configured so that a heat-expandable fire-resistant material is provided on the inner layer side of the vibration insulator, 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.

The present invention provides a drainage pipe joint that penetrates the floor slab of a building and that exhibits optimal vibration control, vibration insulation, and sound insulation performance, and is equipped with a suitable structure (particularly a structure related to vibration insulation performance) for exhibiting these performances.

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.

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 each 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 (drainage horizontal branch pipe 510, upper floor drainage standpipe 520, lower floor drainage standpipe 530, 90 degree bent pipe 540) are molded from, for example, polyvinyl chloride, polyethylene, polybutene, polypropylene, nylon, etc. In addition, the drainage standpipe may be made of, for example, a so-called fire-resistant two-layer pipe.

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, such thermally expandable refractory materials (thermally expandable fire-resistant material 612, thermally expandable fire-resistant sheet 712) are limited to resin materials as described above, and as described below, if the thermally expandable fire-resistant sheet 712 of such thermally expandable refractory materials is not provided (in this portion regardless of the reason), it is preferable to provide vibration-damping material 714 instead of the thermally 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 instead 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). Regarding fire resistance, a heat-expandable fire-resistant sheet 712 is attached to the outer surface of the pipe body 210 in place of the vibration-damping material 714 at a position of the pipe body 210 above the drain pipe connection part 230 (and a heat-expandable fire-resistant material 612 is filled in the recess 212 on the radially inner side of the sheet 712). The heat-expandable fire-resistant sheet 712 attached to the outer surface of the pipe body 210 in this manner 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 the 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 materials: 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 on 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, so that 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 riser pipe 520 is connected to the upper riser pipe connection portion 120 and the drainage horizontal branch pipe 510 is connected to the horizontal branch pipe connection portion 140, and after the drainage pipe fitting 100 has been placed in the through hole of the floor slab S, mortar M is filled into the gap between the through hole of the floor slab S and the drainage pipe fitting 100.
Furthermore, after filling with 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 that has 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.

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 relates to a drainage pipe joint that is installed by penetrating the floor slab of a building, and is particularly preferable in that it exhibits optimal vibration control performance, vibration insulation performance, and sound insulation performance, and is equipped with a suitable structure for exhibiting these performances (especially a structure related to vibration 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 (7)

A method for manufacturing a drainage piping joint comprising: a pipe body that is placed in a through hole of a floor slab when the joint is 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 drainage horizontal branch pipe above the floor slab,
The pipe body includes at least a straight pipe portion and a reduced diameter portion below the straight pipe portion,
The manufacturing method includes a step of providing a vibration insulator on at least a part of an outer periphery of at least a portion of the pipe body that passes through the through hole,
In the above step,
The vibration insulator is a rock wool sheet having a predetermined shape in an unfolded state, and is wound around the outer circumferential surface of the straight pipe section and the outer circumferential surface of the reduced diameter section with the edges of the rock wool sheet abutting against each other,
A manufacturing method characterized in that, after the drainage pipe fitting has been installed in the building and there is no attachment on the outer periphery of the vibration insulator, the vibration insulator is wrapped around the floor slab so that it is not exposed to the upper floor side of the floor slab, but is exposed to the lower floor side of the floor slab with only one part where the edges are abutted against each other . 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,
The pipe body includes at least a straight pipe portion and a reduced diameter portion below the straight pipe portion,
A vibration insulator is provided on at least a part of an outer periphery of at least a portion of the pipe body that passes through the through hole,
the vibration insulator is a sheet having a predetermined shape in an unfolded state, and is wrapped around the outer circumferential surface of the straight pipe section and the outer circumferential surface of the reduced diameter section with the edges of the sheet abutting against each other;
After the drainage pipe joint is installed in the building, when there is no attachment on the outer periphery of the vibration insulator, the vibration insulator is not exposed to the upper floor side of the floor slab , but is exposed to the lower floor side of the floor slab with only one portion where the edges are abutted against each other,
the predetermined shape includes a partial ring shape and a rectangle joined to an outer periphery of the partial ring shape,
The outer circumferential side of the annular ring is above the pipe body,
A drainage pipe fitting characterized in that the edges of the sheets are abutted together, the rectangular portion is wrapped around the outer peripheral surface of the straight pipe portion, and the partially annular portion is wrapped around the outer peripheral surface of the reduced diameter portion . 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,
The pipe body includes at least a straight pipe portion and a reduced diameter portion below the straight pipe portion,
A vibration insulator is provided on at least a part of an outer periphery of at least a portion of the pipe body that passes through the through hole,
the vibration insulator is a sheet having a predetermined shape in an unfolded state, and is wrapped around the outer circumferential surface of the straight pipe section and the outer circumferential surface of the reduced diameter section with the edges of the sheet abutting against each other;
After the drainage pipe joint is installed in the building, when there is no attachment on the outer periphery of the vibration insulator, the vibration insulator is not exposed to the upper floor side of the floor slab, but is exposed to the lower floor side of the floor slab with only one portion where the edges are abutted against each other,
The predetermined shape is a partial annular shape, and includes a plurality of narrow grooves having a predetermined width from the outer periphery of the annular shape to the inner periphery of the annular shape, the narrow grooves corresponding to the length of the vibration isolator covered by the floor slab,
The outer circumferential side of the annular ring is above the pipe body,
A drainage pipe fitting characterized in that the sheets are wrapped around the outer peripheral surface of the straight pipe section by abutting the groove edges that form the narrow grooves so as to close each of the narrow grooves, and the sheets are wrapped around the outer peripheral surface of the reduced diameter section by abutting the end edges of the sheets against each other. 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,
The pipe body includes at least a straight pipe portion and a reduced diameter portion below the straight pipe portion,
A vibration insulator is provided on at least a part of an outer periphery of at least a portion of the pipe body that passes through the through hole,
the vibration insulator is a sheet having a predetermined shape in an unfolded state, and is wrapped around the outer circumferential surface of the straight pipe section and the outer circumferential surface of the reduced diameter section with the edges of the sheet abutting against each other;
After the drainage pipe joint is installed in the building, when there is no attachment on the outer periphery of the vibration insulator, the vibration insulator is not exposed to the upper floor side of the floor slab, but is exposed to the lower floor side of the floor slab with only one portion where the edges are abutted against each other,
A sound insulating cover is provided on the outer periphery of the vibration insulator,
The vibration insulator is fixed to the sound-insulating cover on the outer layer side,
A drainage pipe joint, characterized in that the vibration insulator is fixed intermittently in a circumferential direction of the sound-insulating cover. The drainage pipe joint according to claim 4, characterized in that the vibration insulator is fixed intermittently in the circumferential direction of the sound insulation cover in a height range corresponding to the straight pipe section. The drainage pipe joint according to claim 4 or 5, characterized in that the vibration insulator is fixed by point attachment at two to four points around the circumference of the sound insulation 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 4 to 6, characterized in that a heat-expandable fire-resistant material is provided on the inner layer side of the vibration insulator, 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.

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