Drainage pipe fittings

Abstract

In drainage pipe fittings, optimal vibration damping, vibration isolation, and sound insulation performance can be achieved. [Solution] This drainage pipe joint 100 comprises a pipe body 110 that is placed in a through-hole in the floor slab S when installed in a building, an upper riser pipe connection part 120 that protrudes above the floor slab S and connects to a drain riser pipe 520 that allows drainage from the upper floor to flow in, a drainage pipe connection part 130 that protrudes below the floor slab S and connects to a drain riser pipe 530 that allows drainage to flow out to the lower floor, and a horizontal branch pipe connection part 140 that connects to a horizontal drain branch pipe 510 above the floor slab S. An outer layer member 700 is provided so as to be wrapped around the outer circumference of the pipe body 110, and this outer layer member 700 has a three-layer structure consisting of a vibration damping material 714, a vibration insulator 720, and a sound insulation cover 730 in order from the inner layer.

Description

Technical Field

[0001] The present invention relates to a drainage pipe joint provided through a floor slab of a building, and particularly to a drainage pipe joint capable of exhibiting optimal vibration damping performance, vibration insulation performance, and sound insulation performance.

Background Art

[0002] In apartment buildings, office buildings, etc., water supply facilities and drainage facilities are provided. Among these, the drainage facilities typically have a drainage pipe structure including a vertical pipe that penetrates vertically through each floor of the building, a horizontal pipe installed within each floor, and a drainage pipe joint that connects these. And such a drainage pipe joint, when constructed in a building, includes a pipe body disposed in a through-hole of the floor slab, an upper riser connection portion that protrudes above the floor slab and connects to a drainage riser for allowing drainage from the upper floor to flow in, a lower riser connection portion that protrudes below the floor slab and connects to a drainage riser for allowing drainage to flow down to the lower floor, and a horizontal branch connection portion that connects a drainage horizontal branch pipe above the floor slab. Further, the pipe body often has a portion (such as a swivel blade, a deflector plate, etc.) for changing the flow of drainage within the drainage pipe joint. Also, such a drainage pipe joint formed of one or more resin injection molded products is widely known.

[0003] In a building equipped with a drainage pipe structure using such a drainage pipe joint, in order to prevent flames, soot, and toxic gases from flowing out to the upper floors through the burned or melted part of the drainage pipe structure when a fire or the like occurs downstairs, a heat-expandable refractory is provided separately on the outer periphery of the pipe material or embedded in the wall portion of the pipe material of the drainage pipe joint, so that the through-hole of the floor slab is maintained in a state blocked by this heat-expandable refractory during a fire.

[0004] As an example of such technology, Japanese Patent Publication No. 6576711 (Patent Document 1) discloses a drain pipe joint that is installed through a floor slab of a building, comprising: a joint body to which a drain 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, wherein the joint body is made of a thermoplastic resin, and the first covering material integrally comprises, arranged in this order from the inside out: a first sound-absorbing layer made of a sponge material, a second sound-absorbing layer made of an aggregate of inorganic fibers, and a waterproof and sound-insulating surface layer; and a thermal expansion material sandwiched between the first and second sound-absorbing layers and provided around the joint body in at least one annular shape. [Prior art documents] [Patent Documents]

[0005] [Patent Document 1] Patent No. 6576711 [Overview of the project] [Problems that the invention aims to solve]

[0006] In the drainage joint disclosed in Patent Document 1 mentioned above, The outer surface of the part of the joint body that penetrates the floor slab is covered with the first covering material, and the outer surface of the part that protrudes from the upper surface of the floor slab is covered with the second covering material. (1) The structure of the first covering material is from the inside • First sound-absorbing layer made of sponge material (urethane foam) • Thermal expansion material sandwiched between the first sound-absorbing layer and the second sound-absorbing layer • A second sound-absorbing layer (glass wool) consisting of an aggregate of inorganic fibers. • Waterproof and sound-insulating outer layer (aluminum glass cloth) (2) The structure of the second covering material is from the inside • Upper sound-absorbing layer (felt) made of sound-absorbing material • Upper sound insulation layer made of sound-insulating material (butyl rubber) This structure is being revealed.

[0007] However, the structure disclosed in Patent Document 1 only discloses that the thermal expansion material is provided in an annular 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 enclosed in the first covering material is backfilled with mortar. This does not mean that optimal vibration damping performance, vibration isolation performance, and sound insulation performance can be achieved.

[0008] This invention was developed in view of the above-mentioned problems, and its objective is to provide a drainage pipe joint that penetrates the floor slab of a building and can exhibit optimal vibration damping performance, vibration isolation performance, and sound insulation performance. [Means for solving the problem]

[0009] To achieve the above objective, the drainage pipe joint according to the present invention employs the following technical means. In other words, the drainage pipe joint according to the present invention comprises a pipe body that is placed in a through-hole in a floor slab when installed in a building, an upper riser connection part that protrudes above the floor slab and connects to a drain riser pipe that allows drainage from the upper floor to flow in, a drain pipe connection part that protrudes below the floor slab and connects to a drain pipe that allows drainage to flow out to the lower floor, and a horizontal branch pipe connection part that connects to a horizontal drain branch pipe above the floor slab, and is characterized in that it comprises a vibration damping material integrally provided on at least a part of the outer circumferential surface of at least the portion of the pipe body that passes through the through-hole.

[0010] 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 can be formed in a sheet shape and wrapped around the outer surface. More preferably, the vibration damping material can be configured such that a vibration insulator is provided on its outer circumference.

[0011] More preferably, the vibration insulator can be configured to have a sound-insulating cover on its outer circumference. More preferably, the vibration insulator can be configured to be fixed to the sound-insulating cover on the outer layer side. More preferably, the pipe body comprises at least 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 insulation cover within a height range corresponding to the straight pipe section.

[0012] More preferably, the vibration insulator can be configured to be fixed at 2 to 4 points in the circumferential direction of the sound insulation cover on the outer layer side. More preferably, the drainage pipe joint may be formed from one or more resin injection molded products and may be configured to include a portion in which a sheet-like thermally expandable fire-resistant material is provided on the outer surface in place of at least a part of the vibration damping material.

[0013] More preferably, the drainage pipe joint is formed from one or more injection-molded resin products, the pipe body comprises 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 part 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 corresponding to the straight pipe section.

[0014] More preferably, the vibration damping material may be formed from a butyl-based or asphalt-based material, and the sound insulation cover may be formed from a rubber-based, elastomer-based, or olefin-based material. More preferably, the sound-insulating cover includes a non-stretchable cover body having a length corresponding to the entire vertical length of the vibration insulator, and may be configured to have an elastic material only at the upper end, or at both the upper and lower ends, between the cover body and the outer surface of the drainage pipe joint.

[0015] More preferably, the elastic material can be configured to be provided on the inner peripheral surface of the cover body or the outer surface of the drainage pipe joint. More preferably, the cover body can be configured to be made of a hard resin. More preferably, the sound insulation cover can be configured to contact the outer surface of the drainage pipe joint through a ring-shaped elastic material having elasticity corresponding to the outer diameter of the drainage pipe joint.

[0016] More preferably, the vibration insulator can be configured to be fixed to the sound insulation cover on the outer layer side by fixing one circumference outside the vibration insulator continuously or intermittently at at least one location in the height direction of the sound insulation cover on the outer layer side.

Advantages of the Invention

[0017] According to the present invention, it is possible to provide a drainage pipe joint provided through a floor slab of a building, which can exhibit optimal vibration damping performance, vibration insulation performance, and sound insulation performance.

Brief Description of the Drawings

[0018] [Figure 1] (A) A top view and (B) a side view showing a drainage pipe structure in which a drainage pipe joint 100 according to a first embodiment of the present invention is adopted. [Figure 2] A view showing the drainage pipe structure of FIG. 1, (A) a perspective view showing a state after an outer layer member 700 is provided on the drainage pipe joint 100, and (B) a perspective view showing a state before the outer layer member 700 is provided on the drainage pipe joint 100. [Figure 3] A view showing the drainage pipe joint 100, (A) a perspective view showing a state after a thermally expandable refractory 6:12 and a thermally expandable refractory sheet 7:12 are provided, and (B) a perspective view showing a state before the thermally expandable refractory 6:12 and the thermally expandable refractory sheet 7:12 are provided. [Figure 4](A) An exploded view of the drainage pipe fitting 100 shown in Figure 3(B), and (B) a perspective view of the pipe body 110 with the pipe wall visible. [Figure 5] This is a cross-sectional view of line 5-5 in Figure 1, showing a drainage piping structure in which the drainage piping joint 100 is used. [Figure 6] This is a partially enlarged cross-sectional view of Figure 5 (without the recessed section). [Figure 7] This is a partially enlarged cross-sectional view of Figure 5 (with a recessed section). [Figure 8] (A) This is an unfolded view of rock wool, which is an example of a vibration insulator 720 (formed from fire-resistant inorganic fibers) that forms the three-layer outer layer member 700 shown in Figure 5, and (B) This is an unfolded view of rock wool, which is an example of a vibration insulator 726, a comparative example thereof. [Figure 9] (A) is a top view and (B) is a side view showing a drainage piping structure employing the drainage piping joint 200 according to the second embodiment of the present invention. [Figure 10] Figure 9 shows the drainage piping structure, where (A) is a perspective view showing the state after the outer layer member 800 has been installed on the drainage piping joint 200, and (B) is a perspective view showing the state before the outer layer member 800 has been installed on the drainage piping joint 200. [Figure 11] This figure shows a drainage pipe fitting 200, where (A) is a perspective view showing the state after the heat-expandable fire-resistant material 612 and the heat-expandable fire-resistant sheet 712 have been installed, 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 installed. [Figure 12] (A) An exploded view of the drainage pipe fitting 200 shown in Figure 11(B), (B) a cross-sectional view of the pipe body 210, and (C) a cross-sectional view of the pipe body 210 illustrating the recess 212 in which the heat-expandable fire-resistant material 612 is filled. [Figure 13] This is a cross-sectional view (13-13) of Figure 1, showing a drainage piping structure in which drainage pipe fitting 200 is used. [Figure 14] This is a partially enlarged cross-sectional view of Figure 13. [Figure 15] (A) to (E) are diagrams illustrating the arrangement of thermally expandable fire-resistant materials. [Figure 16] This is a cross-sectional view showing a drainage piping structure in which a drainage piping joint 101 according to one modified example of the present invention is employed. [Figure 17] Figure 16 is a diagram illustrating the state in which the sound insulation cover is set on the pipe body in the drainage pipe fitting 101. [Figure 18] This is a cross-sectional view showing a drainage piping structure in which a drainage piping joint 101 according to a second modified example of the present invention is employed. [Figure 19] Figure 18 is a diagram illustrating the state in which the sound insulation cover is set on the pipe body in the drainage pipe fitting 103. [Figure 20] Figure 16 illustrates a construction method for setting the pipe body into a sound-insulating cover embedded in the slab, as shown in the drainage pipe joint 101. [Figure 21] Figure 18 illustrates a construction method for setting the pipe body into a sound-insulating cover embedded in the slab, as shown in the drainage pipe joint 103. [Modes for carrying out the invention]

[0019] In the following, the drainage pipe joint 100 according to the first embodiment of the present invention will be described in detail with reference to Figures 1 to 8, and the drainage pipe joint 200 according to the second embodiment of the present invention will be described in detail with reference to Figures 9 to 15, including the construction method. Here, the perspective views shown in Figures 2 to 4 and Figures 10 to 12 are schematic representations and may not be perfectly consistent with other figures (for example, Figures 5 and 13) (for example, the presence or absence of a drainage pipe connected to the drainage pipe joint 100 or the drainage pipe joint 200, the presence or absence of vibration damping material 714 provided in places other than the socket portion of the upper riser pipe connection part 120 and the socket portion of the lateral branch pipe connection part 140, and the shape of the swivel vane 114). Also, in the following description, the terms outer surface, outer surface and outside, outer layer side, outer circumference side and outside, and inner layer side, inner circumference side and inside may not be clearly distinguished in the description.

[0020] <Overview> As shown in Figures 1 and 5 and Figures 9 and 13, a drainage piping structure using a drainage pipe fitting 100 or drainage pipe fitting 200 according to an embodiment of the present invention comprises: a drainage pipe fitting 100 or drainage pipe fitting 200 provided in a through hole that penetrates vertically through a floor slab S in a building; an upper-floor drain riser pipe 520 connected to these drainage pipe fittings 100 or drainage pipe fitting 200 above the floor slab S to allow drainage from the upper floor to flow in; (in this case, three) drainage horizontal branch pipes 510 connected to these drainage pipe fittings 100 or drainage pipe fitting 200 above the floor slab S; and a lower-floor drain riser pipe 530 or 90-degree bent pipe 540 connected to these drainage pipe fittings 100 or drainage pipe fitting 200 below the floor slab S to allow drainage to flow to the lower floor. The drainage piping structure using drainage pipe fitting 100 is used on floors other than the lowest floor, while the drainage piping structure using drainage pipe fitting 200 is used on the lowest floor. Above the floor slab S, these drainage piping structures have the same structure. These drainage piping structures are examples, and the drainage pipe fitting according to the present invention is not limited to the exemplified drainage piping structure.

[0021] Here, drain pipe fittings 100 or drain pipe fittings 2 are used in these drain pipe structures. The drain pipes connected to these drain pipe fittings are made of non-fire-resistant resin. However, the drain pipe fittings according to the present invention are sometimes limited to such non-fire-resistant resin and sometimes include non-resin materials such as cast iron, without being limited to resin. For this reason, in the following description, the drain pipe fittings 100 and 200, and the drain pipes connected to these drain pipe fittings, will be described as being made of non-fire-resistant resin, and cases where they are not limited to resin will be mentioned as appropriate in the description. Here, "non-fire-resistant" refers to the property of being deformable, melted, or combustible due to the heat caused by a fire in a building, and resin materials are an example of this. When resin is used, the drain pipe fittings 100 and 200, and the pipes connected to them (drain horizontal branch pipe 510, upper floor drain riser pipe 520, lower floor drain riser pipe 530, 90-degree bent pipe 540) are molded from materials such as polyvinyl chloride, polyethylene, polybutene, polypropylene, or nylon. Furthermore, for drainage risers, for example, so-called fire-resistant double-layer pipes may be used.

[0022] As shown in Figures 4(A) and 5, the drainage pipe fitting 100 is formed from one or more (in this example, seven) resin injection molded parts, as shown in Figures 12(A) and 13. The drainage pipe fitting 100 is formed from one or more (in this example, seven) resin injection molded parts. As shown in Figures 1, 4(A), and 5, when installed in a building, the drainage pipe fitting 100 comprises a pipe body 110 that is placed in a through-hole in the floor slab S, an upper riser pipe connection part 120 that protrudes above the floor slab S and connects to a drain riser pipe 520 that allows drainage from the upper floor to flow in, a drain pipe connection part 130 that protrudes below the floor slab S and connects to a drain pipe (in this case, a drain riser pipe 530) that allows drainage to flow out to the lower floor, and a horizontal branch pipe connection part 140 that connects to a horizontal drain branch pipe 510 above the floor slab S. Furthermore, as shown in Figures 9, 12(A), and 13, the drainage pipe fitting 200 includes a pipe body 210 that is placed in a through-hole in the floor slab S when installed in a building, an upper riser pipe connection part 120 that protrudes above the floor slab S and connects to a drainage riser pipe 520 that allows drainage from the upper floor to flow in, a drainage pipe connection part 230 that protrudes below the floor slab S and connects to a drainage pipe (in this case, a 90-degree bent pipe 540 suspended on the lower floor side of the floor slab S by an attachment member T) that allows drainage to flow out to the lower floor, and a horizontal branch pipe connection part 140 that connects to a horizontal drainage branch pipe 510 above the floor slab S. Thus, the drainage pipe fitting 100 and the drainage pipe fitting 200 differ in their pipe body 110 and pipe body 210, their drainage pipe connection part 130 and drainage pipe connection part 230, and their outer layer members 700 and 800 (described later). In other words, drainage pipe fitting 100 and drainage pipe fitting 200 are common above the floor slab S. These common parts are denoted by the same reference numerals in drainage pipe fitting 100 and drainage pipe fitting 200.

[0023] As shown in these figures, a common feature of the drainage pipe fittings 100 and 200 is that the lateral branch pipe connection section 140 consists of a water collection chamber 142 with three openings spaced 90° apart in plan view, and a first lateral branch pipe connecting member 144, a second lateral branch pipe connecting member 146, and a third lateral branch pipe connecting member 148 for connecting drainage lateral branch pipes corresponding to the positions of these openings. Here, although not limited to these, the first lateral branch pipe connecting member 144, the second lateral branch pipe connecting member 146, and the third lateral branch pipe connecting member 148 all connect the drainage lateral branch pipe 510 without reducing its diameter, but it is also acceptable for the pipe diameter to change.

[0024] The pipe body 110 of the drainage pipe fitting 100 and the pipe body 210 of the drainage pipe fitting 200 differ in the following respects. The pipe body 210 is shorter in length in the drainage direction than the pipe body 110, does not have the tapered diameter section 118 that the pipe body 110 has, and does not have the swivel vane 114 that protrudes from the inner surface of the pipe body 110 between the lateral branch pipe connection section 140 and the drainage pipe connection section 130 that the pipe body 110 has. Furthermore, a recess 112 corresponding to this protrusion (in this case, the swivel vane 114) is formed on the outer surface of the pipe body 110, and as shown in Figure 3, a putty-like heat-expandable fire-resistant material 612 is filled into this recess 112. On the other hand, the pipe body 210 has a recess 212 in place of the recess 112 of the pipe body 110, and as shown in Figure 11, a putty-like heat-expandable fire-resistant material 612 is applied to the portion of this recess 212. It is filled.

[0025] Here, we will describe the heat-expandable refractory material 612 that is filled into the recess 112 or recess 212. The heat-expandable refractory material 612 is formed from, for example, a resin composition containing a resin component mainly composed of butyl rubber, a phosphorus compound, neutralized heat-expandable graphite, a hydrated inorganic substance, and a metal carbonate, or a resin composition containing epoxy resin, a phosphorus compound, neutralized heat-expandable graphite, and an inorganic filler. For this heat-expandable refractory material 612, for example, the product name "Fiblock" manufactured by Sekisui Chemical Co., Ltd. (expands 5 to 40 times at a reaction temperature of 200°C) is used. In addition, other products such as the product name "Heat-Expandable Heat-Resistant Sealant IP" manufactured by Inaba Electric Industry Co., Ltd. (starts to expand from 120°C and expands in volume to more than 4 times) and the product name "Heatmel" manufactured by Furukawa Techno Material Co., Ltd. (expansion start temperature 120°C, significant expansion temperature 260°C, expands 4 to 8 times) can be used as the heat-expandable refractory material 612.

[0026] Furthermore, the thermally expandable fire-resistant material 612 is not limited to those described above; a wide variety of materials with different reaction temperatures and expansion rates can be used. Therefore, the most suitable material can be selected and used to meet the various conditions such as reaction temperature and pipe diameter required for the construction site within the building. This heat-expandable fire-resistant material 612 is formed in a non-hardened, non-drying putty-like state, and is filled into the recess 112 on the outer surface of the pipe body 110 of the drainage pipe fitting 100 or the recess 212 on the outer surface of the pipe body 210 of the drainage pipe fitting 200 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 later, or without the heat-expandable fire-resistant sheet 712).

[0027] Here, the protruding portion of the pipe body 110 is not limited to a swirl vane 114, but may be a flow deflector or the like, as long as it is a part that changes the flow of drainage within the drainage pipe fitting 100, and is not limited to a swirl vane or a flow deflector, as long as a recess 112 corresponding to the outer surface of the pipe body 110 is formed. Furthermore, the recess 212 of the pipe body 210 is not limited to the shape shown. In any drainage pipe fitting 100 or drainage pipe fitting 200, the heat-expandable fire-resistant material 612 is filled into the recess on the outer surface of these drainage pipe fittings. Note that, as shown in Figure 12(B), the recess of the pipe body 210 is formed as the pipe body 210 is reduced in diameter, but because the inner wall of the pipe body 210 widens downstream, the pipe body 210 is not described as having a reduced diameter portion (tapered portion) in order to distinguish it from the reduced diameter portion 118 of the pipe body 110.

[0028] Furthermore, a sheet-like thermally expandable fire-resistant sheet 712 is provided wrapped around the outer surface of the pipe body 110, corresponding to the height position of the pipe body 110 corresponding to the floor slab S, as shown in Figures 3 and 5. Similarly, a sheet-like thermally expandable fire-resistant sheet 712 is provided wrapped around the outer surface of the pipe body 210, corresponding to the height position of the pipe body 210 corresponding to the floor slab S, as shown in Figures 11 and 13. These thermally expandable fire-resistant materials 612 and thermally expandable fire-resistant sheets 712 are separated vertically in the pipe body 110, whereas in the pipe body 210, they overlap radially without being separated vertically. Note that the dashed lines in Figures 3 and 11 indicate removal.

[0029] In buildings employing such drainage piping structures, if a drainage pipe fitting 100 or drainage pipe fitting 200 burns, the heat causes the heat-expandable fire-resistant material 612 and the heat-expandable fire-resistant sheet 712 to expand radially inward, crushing the hollow portion of the drainage pipe fitting 100 or drainage pipe fitting 200 and sealing the fitting. As a result, drainage piping structures using these drainage pipe fittings 100 or drainage pipe fitting 200 can block the pipeline in the event of a fire, preventing flames, smoke, etc. from flowing through.

[0030] Here, as mentioned above, the provision of such heat-expandable refractory materials (heat-expandable refractory material 612, heat-expandable refractory sheet 712) is limited to those made of resin, and as will be described later, if the heat-expandable refractory sheet 712 among such heat-expandable refractory materials is not provided (for any reason in this part), it is preferable to provide a vibration damping material 714 in place of the heat-expandable refractory sheet 712. The outer layer members 700 and 800, which are provided to be wrapped around the outer circumference of the pipe body 110 or the outer circumference of the pipe body 210 and the drain pipe connection part 230, will be described with reference to Figures 5 to 7 for the drain pipe joint 100 and Figures 13 to 14 for the drain pipe joint 200.

[0031] As shown in these figures, the outer layer members 700 and 800 have a three-layer structure and are provided on the outer surface of the pipe body 110 or the outer surface of the pipe body 210 and the drain pipe connection part 230, in the following order from the outer surface of the drain pipe joint 100 or the drain pipe joint 200: vibration damping material 714 (or heat expandable fire-resistant sheet 712), vibration insulator 720 or vibration insulator 820 formed of fire-resistant inorganic fibers, and sound insulation cover 730. The vibration insulator 720 and vibration insulator 820 have different shapes when unfolded, as will be described in more detail later. The recesses 112 or 212 are filled with a heat-expandable fire-resistant material 612, which provides fire resistance (fire spread prevention function). Furthermore, because the hollow recesses 112 or 212 are filled with the putty-like heat-expandable fire-resistant material 612, vibration damping and sound insulation performance are also provided.

[0032] In the drainage pipe fitting 100, the vibration damping material 714 is attached to the outer surface (for example, with adhesive or a similar adhesive) of the pipe body 110 so as to cover the heat-expandable fire-resistant material 612 filled in the recess 112. Regarding 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 on the pipe body 110 above the recess 112 where the heat-expandable fire-resistant material 612 is filled. The heat-expandable fire-resistant sheet 712 attached to the outer surface of the pipe body 110 in this way also exhibits vibration damping performance similar to the vibration damping material 714 (although the performance may not be equivalent). In the drainage pipe fitting 200, the vibration damping material 714 is attached (for example, with adhesive or a similar adhesive) to the outer surface of the drainage pipe connection part 230. Furthermore, regarding fire resistance, at a position on the pipe body 210 above the drain pipe connection 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 a heat-expandable fire-resistant material 612 is filled into a recess 212 on the radially inner circumference side). The heat-expandable fire-resistant sheet 712 attached to the outer surface of the pipe body 210 in this way exhibits vibration damping performance similar to that of the vibration damping material 714 (although the performance may not be equivalent).

[0033] As will be explained in more detail later, the thermal expansion coefficients of the thermally expandable fire-resistant material 612 and the thermally expandable fire-resistant sheet 712 are different. Generally speaking, a high thermal expansion coefficient in a thermally expandable fire-resistant material results in poor shape retention after expansion, while a low thermal expansion coefficient results in good shape retention after expansion. A low thermal expansion coefficient may prevent the material from exhibiting sufficient fire resistance, and poor shape retention may cause the thermally expandable material to fall. Considering this trade-off characteristic, as well as the thermal expansion coefficient (and even the absolute value of the difference between them), the thermally expandable material contained in the thermally expandable fire-resistant material 612 and the thermally expandable fire-resistant sheet 712 is selected according to their respective positions, weights, shapes, reaction rates, and expansion initiation temperatures.

[0034] Thus, in this three-layer structure, the innermost layer 710 is either a heat-expandable fire-resistant sheet 712 or a vibration-damping material 714. The vibration damping material 714 is formed by including a butyl-based (butyl rubber, etc.) or asphalt-based (rubber asphalt, modified asphalt, etc.) material, and the sound insulation cover 730 is made of a rubber-based (EPDM (ethylene propylene diene rubber), etc.), elastomer-based or olefin-based (polyester) material. The vibration insulators 720 and 820, which are formed from materials such as ethylene resin and are made of fire-resistant inorganic fibers, consist of a collection of fire-resistant inorganic fibers (porous material).

[0035] Here, examples of inorganic fibers include artificial mineral fibers such as glass wool, rock wool, or ceramic fiber, which are preferred not only for their high vibration insulation performance but also for their high sound absorption performance. Vibrations caused by drainage flowing down the pipe body 110 or the pipe body 210 and drainage pipe connection 230 (for example, vibrations generated when hitting the swivel vane 114) are suppressed by the vibration damping material 714, and then the vibrations are further blocked (and / or the noise associated with the vibrations is absorbed) by the vibration insulator 720 made of rock wool or the like, and the propagation of noise associated with the vibrations is further blocked by the sound insulation cover 730 made of a rubber cover made of EPDM or the like. Here, rock wool is a general term for materials manufactured mainly from natural rock or blast furnace slag or other iron slag, and glass wool is a general term for cotton-like materials made of glass fibers, both of which have fire resistance and flame-retardant properties.

[0036] In the following, we may describe cases where butyl rubber is used as the vibration damping material 714, rock wool is used as the vibration insulator 720, and an EPDM rubber cover is used as the sound insulation cover 730, but these materials are merely examples. When using rock wool as the vibration insulator 720, it is preferable to use sheet-shaped rock wool manufactured by papermaking. However, it is difficult to process rock wool sheets manufactured by papermaking in this way to form the three-dimensional shape (straight pipe section + tapered section) of the pipe body 110 in the drainage pipe joint 100 by sewing or the like. Even if a flat rock wool sheet (which may be simply referred to as rock wool below, but even in this case, it is preferable that the vibration insulator 720 in the present invention be in the form of a sheet) 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 unfolded shape (flat shape) of the rock wool sheet is as shown in Figure 8(A), for example.

[0037] In this way, even if the floor slab S is thin, the cut can be made in only one place in the vertical direction (up and down direction in the pipe body 110). Furthermore, in the unfolded view of the rock wool sheet shown in Figure 8(B), the same principle is achieved in that the cut can be made in only one place in the vertical direction. However, in order to correspond to the three-dimensional shape of the pipe body 110 (straight pipe section + tapered section), Figure 8(A) has cuts (five cuts in total, which are narrow grooves 722 described in more detail later) at the location of the floor slab S in the rock wool sheet, whereas Figure 8(B) joins a rectangle and a partially annular shape with an arc. In the unfolded view shown in Figure 8(A), the cut is at the location of the floor slab S, so even if there is a cut in this part (this part may be mechanically weak or have poor fire resistance), the location is at the location 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 during a fire. In contrast, in the unfolded view of the rock wool sheet shown in Figure 8(B), if the joint portion indicated by the dotted line is not located at the floor slab S, or even if it is located at the floor slab S, there is a possibility that the rock wool sheet may break at this joint and fall during a fire due to reasons such as the short length of the joint portion and the large weight of the annular portion joined at the bottom. The shape of this vibration insulator 720 and the details of the effects based on that shape will be described later. Furthermore, regarding the vibration insulator 820, in the drainage pipe joint 200, the pipe body 210 and the drainage pipe connection portion 230 on which the vibration insulator 820 is provided are in a substantially straight pipe shape and do not have a three-dimensional shape (straight pipe portion + reduced diameter portion (tapered portion)) like the pipe body 110, therefore, the rock wool sheet in the unfolded shape shown in Figure 8(A) above does not have to be adopted, but it may be adopted.

[0038] Furthermore, the vibration insulator 720, which employs this rock wool, extends to the vibration damping material 714 on the inner layer side. In order to suppress noise propagation due to resonance with respect to the heat-expandable fire-resistant sheet 712, the rock wool is provided in a manner that is loose and fixed at several points in the circumferential direction rather than being fixed all around. In particular, the height of these several fixing points in the circumferential direction for fixing the rock wool (more specifically, fixing the rock wool to the EPDM rubber cover which serves as the sound insulation cover 730) is set above the heat-expandable material (heat-expandable fire-resistant material 612 and heat-expandable fire-resistant sheet 712) to prevent the rock wool from falling in the event of a fire. One example of an attachment method that prevents this falling is bonding with adhesive, double-sided tape, etc.

[0039] The following describes a manufacturing method (not an installation method) for a drainage pipe fitting 100 equipped with the three-layer outer layer member 700 or a drainage pipe fitting 200 equipped with the outer layer member 800, and explains the procedure for attaching the outer layer member 700 or the outer layer member 800. First, a putty-like heat-expandable fire-resistant material 612 is filled into the recess 112 or recess 212. Then, a heat-expandable fire-resistant sheet 712 is attached. In the drainage 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 drainage pipe joint 200, the heat-expandable fire-resistant sheet 712 is attached so as to cover all or part of the putty-like heat-expandable fire-resistant material 612. Furthermore, a vibration damping material 714 is attached to the outer surface of the pipe body 110 or the drainage pipe connection part 230 with adhesive or a bonding agent. In this case, the innermost layer 710 of this three-layer structure contains either the heat-expandable fire-resistant sheet 712 or the vibration damping material 714. Although not layered, in these drainage pipe fittings 100 and 200, there is a heat-expandable fire-resistant material 612 filled in a recess 112 or recess 212 on the inner layer side of the heat-expandable fire-resistant sheet 712.

[0040] After installing the heat-expandable fire-resistant sheet 712 and the vibration damping material 714, a rock wool sheet (whose unfolded view is shown in Figure 8(A)) as a vibration insulator 720, or a rock wool sheet (which is rectangular but whose unfolded view is not shown) as a vibration insulator 820, is wrapped around it. Furthermore, it is covered with an EPDM rubber cover as a sound insulation cover 730. Here, the EPDM rubber cover as the sound insulation cover 730 provides watertightness, sound insulation, and vibration insulation. Note that the EPDM rubber cover as the sound insulation cover 730 may be integrally molded and bonded to the drain pipe fitting 100 or drain pipe fitting 200 to provide watertightness, or it may be not bonded and provide watertightness solely through tension (provided by the elasticity of the rubber). In this case, it is also preferable to enhance watertightness by providing an annular, thick upper end watertight portion 732 at the upper end of the EPDM rubber cover serving as the sound insulation cover 730 and / or an annular, thick lower end watertight portion 734 at the lower end (although with a different diameter).

[0041] As outlined above, these drainage pipe fittings 100 or 200 are formed from one or more resin injection molded products, penetrate the floor slab S of a building, and can fully exhibit fire resistance and suppress drainage vibrations. In particular, in the three-layer outer layer member 700 or outer layer member 800, a vibration damping material 714, such as 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 vibrations very effectively, and a vibration insulator 720, such as a rock wool sheet, or a vibration insulator 820 (whose unfolded shape differs from that of the vibration insulator 720) is provided as an intermediate layer, loosely fixed in several places to provide sound absorption, fire resistance, and sound insulation. The outermost layer is provided with a sound-insulating cover 730, such as an EPDM rubber cover, to provide watertightness, sound insulation, and vibration isolation. The vibrations caused by drainage flowing down the pipe body 110 or the pipe body 210 and the drain pipe connection part 230 (for example, when it hits the swivel vane 114) are suppressed by the vibration damping material 714, and then the vibrations are further blocked by the vibration insulator 720 or vibration insulator 820, and furthermore, the sound-insulating cover 730 blocks the noise associated with the vibrations. Drainage vibrations can be suppressed very effectively in order to block the generation of sound. Furthermore, since 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 covered with multiple layers including a layer that exhibits fire resistance, the fire resistance can be fully demonstrated.

[0042] Next, the drainage pipe fitting 100 or the drainage pipe fitting 200 will be described in more detail below. As with the overview above, Figures 1 to 8 will be used to describe the drainage pipe fitting 100, and Figures 9 to 15 will be used to describe the drainage pipe fitting 200. Furthermore, in some cases, common components of the drainage pipe fitting 100 and the drainage pipe fitting 200 will be described using the drainage pipe fitting 100 as a representative example.

[0043] <Vibration damping material: Drainage pipe fittings are not generally limited to being made of resin.> The damping material 714 of the innermost layer 710 constituting the outer layer member 700 of the drainage pipe joint 100 is integrally provided on at least a portion of the outer circumferential surface of the pipe body 110 in the portion that passes through the through-hole in the floor slab S. It is not limited to being provided on the entire outer circumferential surface of the pipe body 110; it may be provided on only a portion of the outer circumferential surface of the pipe body 110 (as long as its position overlaps with the floor slab S). Similarly, the damping material 714 of the innermost layer 710 constituting the outer layer member 800 of the drainage pipe joint 200 is integrally provided on at least a portion of the outer circumferential surface of the pipe body 210 in the portion that passes through the through-hole in the floor slab S, and is also provided on the drainage pipe connection portion 230. It is not limited to being provided on the entire outer circumferential surface of the pipe body 210; it may be provided on only a portion of the outer circumferential surface of the pipe body 210 (as long as its position overlaps with the floor slab S). Here, unlike in Figures 10 to 14, the pipe body 210 is integrally equipped with a vibration damping material 714 instead of a heat-expandable fire-resistant sheet 712.

[0044] Furthermore, it is preferable that the vibration damping material 714 is integrally provided on the outer surface where it is installed by being adhered or bonded to the entire surface. In addition, it is preferable that the vibration damping material 714 is formed in a sheet shape and wrapped around the outer surface. By providing a vibration-damping material 714, such as butyl rubber, as the innermost layer 710, in close contact with at least a portion of the outer surface of the pipe body 110 or the outer surface of the pipe body 210 and the drain pipe connection part 230, and integrating it with the drain pipe joint, vibrations generated in the drain pipe joint can be suppressed very effectively.

[0045] Furthermore, it is preferable to have a two-layer outer layer member in which a vibration insulator 720 or vibration insulator 820, such as rock wool, is provided on the outer periphery of the vibration damping material 714. It is also preferable to have a three-layer outer layer member in which a sound insulation cover 730, such as an EPDM rubber cover, is provided on the outer periphery of the vibration insulator 720 or vibration insulator 820. When this three-layer structure is adopted, it is preferable that the vibration insulator 720 or vibration insulator 820 is fixed to the sound insulation cover 730 on the outer layer side rather than to the vibration damping material 714 on the inner layer side.

[0046] More specifically, in the drainage pipe fitting 100, the pipe body 110 comprises at least a straight pipe section 116 and a reduced diameter section 118 below the straight pipe section 116. In this case, it is preferable that the vibration insulator 720 is provided so as to be intermittently fixed in the circumferential direction of the sound insulation cover 730 within the height range corresponding to the straight pipe section 116. Furthermore, in the drainage pipe fitting 100 and the drainage pipe fitting 200, it is preferable that the vibration insulator 720 or vibration insulator 820 is provided so as to be spot-fixed at 2 to 4 locations in the circumferential direction of the outer layer sound insulation cover 730.

[0047] In this way, a vibration insulator 720, such as a rock wool sheet as an intermediate layer, or a vibration insulator 820 (whose unfolded shape differs from that of the vibration insulator 720), is loosely and in several places on the inner layer side. By fixing the damping material 714 to the outer layer sound insulation cover 730 instead, sound absorption, fire resistance (when a thermally expandable fire-resistant material is provided in place of / in addition to the damping material 714), sound insulation, and vibration isolation can be achieved. Furthermore, by providing a sound insulation cover 730, such as an EPDM rubber cover, as the outermost layer, watertightness, sound insulation, and vibration isolation can be achieved, thereby extremely effectively suppressing vibrations generated in the drainage pipe joint.

[0048] Furthermore, as described above, when these drainage pipe fittings 100 and drainage pipe fittings 200 are formed from one or more (in this case, seven) resin injection molded products (non-fireproof) (when the drainage pipe fittings are limited to being made of resin), it is also preferable that a sheet-like thermal expandable fire-resistant sheet 712 is provided (attached) to at least a portion of the vibration damping material 714 on the outer surface of the pipe body 110 or pipe body 210, at least the portion that passes through the through-hole in the floor slab S. In this case, in the drainage pipe fitting 100, a sheet-like thermal expandable fire-resistant sheet 712 is provided on the pipe body 110 in place of a portion of the vibration damping material 714 provided on the pipe body 110. In the drainage pipe fitting 200, a sheet-like thermal expandable fire-resistant sheet 712 is provided (attached) to the pipe body 210 in place of all of the vibration damping material 714 provided on the pipe body 210.

[0049] In this way, when the drain pipe fitting 100 or drain pipe fitting 200 burns, the heat causes the heat-expandable fire-resistant sheet 712 to expand radially inward, crushing the hollow portion of the drain pipe fitting 100 or drain pipe fitting 200 and blocking it. As a result, drain pipe structures using these drain pipe fittings 100 or drain pipe fitting 200 can block the pipeline in the event of a fire, preventing flames, smoke, etc. from flowing through it.

[0050] Furthermore, in the drainage pipe joint 100, the pipe body 110 comprises at least a straight pipe section 116 and a reduced diameter section 118 below the straight pipe section 116. In this case, it is also preferable that a heat-expandable fire-resistant sheet 712 is provided on the inner layer side of the vibration insulator 720 in place of a part of the vibration damping material 714, and that the vibration insulator 720 is fixed to the sound-insulating cover 730 on the outer layer side at a position above the heat-expandable fire-resistant sheet 712 and at a height corresponding to the straight pipe section 116.

[0051] In this way, even if the drain pipe fitting 100 etc. are burned, the vibration insulator 720 is fixed to the outer layer sound insulation cover 730 at a height above the height of the drain pipe fitting 100 which is sealed by the heat-expandable fire-resistant sheet 712, and at a height corresponding to the straight pipe section 116, thus preventing the vibration insulator 720 from falling during a fire.

[0052] <Soundproofing cover: Generally, drainage pipe fittings are not limited to being made of resin.> The outermost sound-insulating cover 730 constituting the outer layer member 700 of the drainage pipe joint 100 is provided on the outer circumference of the vibration insulator 720, which is provided on at least a portion of the outer circumference of the pipe body 110 that passes through the through-hole in the floor slab S, over its entire vertical length. The outermost sound-insulating cover 730 constituting the outer layer member 800 of the drainage pipe joint 200 is provided on the outer circumference of the vibration insulator 820, which is provided on at least a portion of the outer circumference of the pipe body 210 that passes through the through-hole in the floor slab S, over its entire vertical length.

[0053] By providing a sound-insulating cover 730, such as an EPDM rubber cover, around the outer circumference of the vibration insulator 720 or vibration insulator 820 along its entire vertical length, high sound-insulating performance can be achieved. This soundproofing cover 730, which uses an EPDM rubber cover as an example, has water-blocking and sound-insulating properties. It also possesses vibration isolation properties. Therefore, in addition to the sound insulation performance mentioned above, it can exhibit high water-blocking performance and high vibration isolation performance.

[0054] Furthermore, it is preferable that the sound insulation cover 730 is provided with an upper end watertight portion 732 and / or a lower end watertight portion 734 at its upper end, and the upper end watertight portion 732 and / or lower end watertight portion 734 are provided so as to abut (including when they are joined and abutted with adhesive or the like) the outer surface of the drain pipe joint 100 or drain pipe joint 200. These upper end watertight portion 732 and lower end watertight portion 734 are formed of a thicker portion than the main body of the sound insulation cover 730. As a result, it is possible to achieve high watertightness performance and also have excellent strength.

[0055] Furthermore, it is preferable that the sound insulation cover 730 is integrally molded with a cover body having a length corresponding to the entire vertical length of the vibration insulator 720 or vibration insulator 820, including the upper end water-sealing portion 732 and / or the lower end water-sealing portion 734, and that the sound insulation cover 730 itself is expandable and contractible. Since the sound insulation cover 730 itself is elastic, it can be used to provide the sound insulation cover 730 with the sound insulation cover 730 to cover the entire length of the vibration insulator 720 or vibration insulator 820 in the vertical direction.

[0056] <Vibration insulator: While drainage pipe fittings are not generally limited to being made of resin, a reduced diameter section is required.> In the drainage pipe joint 100, the pipe body 110 comprises at least a straight pipe section 116 and a reduced-diameter section 118 below the straight pipe section 116. In this case, the vibration insulator 720 of the intermediate layer constituting the outer layer member 700 of the drainage pipe joint 100 is provided on at least a portion of the outer circumference of the pipe body 110 that passes through the through-hole in the floor slab S. The vibration insulator 720 is a sheet having a predetermined shape as shown in Figure 8(A) when unfolded (it may also be the shape of the vibration insulator 726 shown in Figure 8(B)), and is provided by wrapping the sheet around the outer circumference of the straight pipe section 116 and the reduced-diameter section 118 with their edges in contact. Furthermore, after the drainage pipe joint 100 has been installed in the building, and with no further attachments on the outer circumference of the vibration insulator 720, the vibration insulator 720 is provided in such a state that, as shown in Figures 5 to 8, it is not exposed to the upper floor side of the floor slab S, including the portion where the edges 720S1 or edges 726S1 abut each other as shown in Figure 8(A) or Figure 8(B), but is exposed to the lower floor side of the floor slab S with only one portion where the edges abut each other (the dashed-dotted portion where the edges 720S2 or edges 726S2 abut each other as shown in Figure 8(A) or Figure 8(B)).

[0057] Therefore, even if the floor slab S is thin, the break in the vibration insulator 720 or vibration insulator 726 can be made to appear only in one place in the vertical direction (up and down direction in the pipe body 110) (a break where the edges 720S2 or edges 726S2 come into contact with each other). As a result, the floor slab S does not burn, and because the break in the weak vibration insulator 720 appears only in one place in the vertical direction (up and down direction in the pipe body 110) from the floor slab S, there is no problem with the fire resistance of the vibration insulator 720, and it is possible to prevent it from falling during a fire.

[0058] Furthermore, as shown in detail in Figure 8(A), the predetermined shape of the vibration insulator 720 is a partial annular shape, and it is provided with a plurality (in this case, five) of narrow grooves 722 having a length L(2) corresponding to the length L(1) of the vibration insulator 720 covered by the floor slab S, and having a predetermined width, extending from the outer circumference of the annular shape toward the inner circumference of the annular shape. The outer circumference of the annular shape is above the pipe body 110. The plurality of narrow grooves 722 are wrapped around the outer surface of the straight pipe section 116 so as to close each of the plurality of narrow grooves 722 (by bringing the groove edges 722S that form each narrow groove 722 into contact with each other, and by bringing the edges 720S1 of the sheet into contact with each other), and the edges 720S2 of the sheet are brought into contact with each other and wrapped around the outer surface of the reduced diameter section 118.

[0059] By wrapping the vibration insulator 720 around the outer surface of the pipe body 110 as a sheet in this unfolded shape, even if the pipe body 110 has at least a straight pipe section 116 and a reduced diameter section 118 below the straight pipe section 116, there is no problem with the fire resistance of the vibration insulator 720, and it will not fall off in the event of a fire. In particular, when using a rock wool sheet manufactured as a vibration insulator 720, even if it is difficult to process the rock wool sheet manufactured by papermaking to form the three-dimensional shape (straight section + tapered section) of the pipe body 110 in the drainage pipe joint 100 by sewing or other means, the vibration insulator 720 can be attached to the pipe body 110 without sewing or other means, and it is possible to prevent the vibration insulator 720 from falling off in the event of a fire.

[0060] <Thermal expansion fire-resistant materials: Drainage pipe fittings are basically limited to those made of resin.> In the drainage pipe fitting 100 or drainage pipe fitting 200, two types of heat-expandable fire-resistant materials with different coefficients of thermal expansion are provided: a heat-expandable fire-resistant material 612 and a heat-expandable fire-resistant sheet 712. These will be explained in detail with reference to Figure 15. First, in these drainage pipe fittings 100 or drainage pipe fittings 200, if 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 coefficient of thermal expansion than the heat-expandable fire-resistant material provided on the outer layer side, as shown in Figure 15(A).

[0061] Next, in these drainage pipe fittings 100 or drainage pipe fittings 200, if 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 coefficient of thermal expansion than the heat-expandable fire-resistant material provided on the lower side, as shown in Figure 15(B). However, as will be discussed later, there are cases where this relationship between the coefficients of thermal expansion in the vertical direction does not hold true (for example, in the drainage pipe fitting 100).

[0062] As mentioned above, generally speaking, for thermally expandable fire-resistant materials, a high coefficient of thermal expansion results in poor shape retention after expansion, while a low coefficient of thermal expansion results in good shape retention after expansion. Therefore, as shown in Figures 15(A) and 15(B), a trade-off relationship exists where a low coefficient of thermal expansion may result in insufficient fire resistance, and poor shape retention may cause the thermally expandable material to fall. Taking these characteristics into consideration (and utilizing them), two types of thermally expandable fire-resistant materials are selected in accordance with their respective positions, weights, shapes, reaction rates, and expansion initiation temperatures.

[0063] As a characteristic of the shape of the thermally expandable fire-resistant material, as shown in Figure 15(C), the putty-like thermally expandable fire-resistant material generally has a higher coefficient of thermal expansion than the sheet-like thermally expandable fire-resistant material, compared to the putty-like material used in this embodiment. Referring to Figure 15(D), four examples of possible applications of the placement of heat-expandable fire-resistant material in drainage pipe joints (installed in through-holes in the floor slab S, regardless of the presence or absence of a reduced diameter section) are explained.

[0064] First, the second example shown in Figure 15(D) corresponds to Figure 15(A), and is the drainage pipe joint 200 according to the second embodiment. When the height direction position is the same (here, "same" means that there is no difference in the height direction that would warrant considering the arrangement of the heat-expandable fire-resistant material), but the radial direction position is different, the thermal expansion coefficient of the heat-expandable fire-resistant material on the radial inner layer side is higher than that of the heat-expandable fire-resistant material on the outer layer side. More specifically, in the drainage pipe joint 200, a putty-like heat-expandable fire-resistant material 612 filled in a recess 212 is used as the heat-expandable fire-resistant material on the inner layer side, and a 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 coefficient of thermal expansion than the sheet-like material, the thermally expandable fire-resistant material 612 on the inner layer has a higher coefficient of thermal expansion than the thermally expandable fire-resistant sheet 712 on the outer layer.

[0065] Next, the third example shown in Figure 15(D) corresponds to Figure 15(B), where the radial positions are the same (here, "same" means that there is no radial difference significant enough to warrant considering the arrangement of the thermally expandable fire-resistant material), but the vertical positions are different. In this case, the thermal expansion coefficient of the thermally expandable fire-resistant material on the upper side in the vertical direction is higher than that of the thermally expandable fire-resistant material on the lower side. Furthermore, in the fourth example shown in Figure 15(D), where both the radial and vertical positions are different, a highly thermally expandable fire-resistant material with a high coefficient of thermal expansion is placed on the upper side in the vertical direction and on the radial inner layer side, while a less thermally expandable fire-resistant material with a low coefficient of thermal expansion is placed on the lower side in the vertical direction and on the radial outer layer side.

[0066] Finally, the first example shown in Figure 15(D), which is the drainage pipe joint 100 according to the first embodiment, is relevant. In this case, since two types of heat-expandable fire-resistant material are provided at different positions in the vertical direction, normally, as shown in Figure 15(B) (and as in the third and fourth examples in Figure 15(D)), the heat-expandable fire-resistant material with a high coefficient of thermal expansion would be placed on the upper side of the height position, and the heat-expandable fire-resistant material with a low coefficient of thermal expansion would be placed on the lower side of the height position. However, in the drainage pipe joint 100, a putty-like heat-expandable fire-resistant material 612 filled in the recess 112 is used as the lower heat-expandable fire-resistant material, and a 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 coefficient of thermal expansion than the sheet-like material, the lower heat-expandable fire-resistant material 612 has a higher coefficient of thermal expansion than the upper heat-expandable fire-resistant sheet 712, which does not conform to Figure 15(B).

[0067] In this drainage pipe joint 100, the pipe body 110 has a reduced diameter section 118 below the straight pipe section 116, and a putty-like, highly thermally expandable fire-resistant material 612 is used in the reduced diameter section 118 to quickly seal the reduced diameter section 118 with the putty-like, highly thermally expandable fire-resistant material 612. On the other hand, because the morphological stability is low (it becomes prone to falling), the outer layer of the thermally expandable fire-resistant material 612 is covered with a vibration insulator 720, such as rock wool, which also has fire resistance and flame-shielding properties, and is held in place by the shape of the reduced diameter section 118, which has a gradually decreasing pipe diameter, thereby preventing the putty-like, thermally expandable fire-resistant material 612 from falling and compensating for the low morphological stability.

[0068] Thus, there may be exceptions regarding the height direction in the arrangement of thermally expandable fire-resistant materials based on their thermal expansion coefficient. In Figure 15(D), the thermally expandable fire-resistant material is represented by a rectangle indicating a sheet-like structure. However, the thermally expandable fire-resistant material in Figure 15(D) may be in the form of a sheet or a putty, and may be in any combination of sheet-like structures, putty-like structures, or sheet-like structures. Furthermore, if two types of thermally expandable fire-resistant materials with different thermal expansion coefficients are used, the present invention also includes the use of a third type of thermally expandable fire-resistant material in a third location, not limited to just two locations.

[0069] In addition to the above-mentioned examples of arrangement of heat-expandable fire-resistant materials, another example is when, as in the case of a pipe body 110, which comprises 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 materials are provided at different radial positions within the height range of the straight pipe section 116. Furthermore, another example is the provision of two types of heat-expandable fire-resistant materials with different coefficients of thermal expansion in the straight pipe section 116 and the reduced diameter section 118, respectively. For example, a drain pipe joint 100 is such an example.

[0070] Another example is when two types of heat-expandable fire-resistant materials with different coefficients of thermal expansion are arranged to have overlapping portions. For example, drainage pipe fittings 200 are an example of this. Furthermore, at least one of these two types of heat-expandable fire-resistant materials with different coefficients of thermal expansion is Another example is when they are located in a position corresponding to the floor slab S. For example, drainage pipe fittings 100 and 200 are such examples, where the heat-expandable fire-resistant sheet 712 is prevented from expanding outward by the floor slab S and can only expand radially inward, quickly crushing and closing the hollow portion of the drainage pipe fitting 100 or 200.

[0071] As described above, it is preferable that such heat-expandable fire-resistant materials with different coefficients of thermal expansion be provided in either an annular form, where they are in sheet form and arranged in an annular shape around the straight pipe section 116 of the drainage pipe fitting 100, or a filling form, where they are in putty form and filled into the recess 112 of the drainage pipe fitting 100 or the recess 212 of the drainage pipe fitting 200. In this way, vibration damping properties can be achieved by providing a sheet-like heat-expandable fire-resistant material in an annular form, and a putty-like heat-expandable fire-resistant material in a filling form.

[0072] <Installation method for drainage pipe fittings: Drainage pipe fittings are basically limited to those made of resin.> The following describes a construction method for installing drainage pipe fittings by placing them in through-holes in the floor slab S of a building. The drainage pipe fittings suitable for this construction method, drainage pipe fitting 100 and drainage pipe fitting 200, further possess the following structural features. In the following description, drainage pipe fitting 100 will be used as a representative example.

[0073] This drainage pipe fitting 100 is formed entirely from one or more resin injection molded parts and, when installed in a building, comprises a pipe body 110 positioned in a through-hole in the floor slab S, an upper riser pipe connection part 120 that protrudes above the floor slab S and connects to a drain riser pipe 520 that allows drainage from the upper floor to flow in, and a drain pipe connection part 130 that protrudes below the floor slab S and connects to a drain pipe (in this case, a drain riser pipe 530) that allows drainage to flow to the lower floor, and the floor slab A drainage pipe fitting comprising a branch pipe connector 140 for connecting a drainage branch pipe 510 above the tubing S, wherein the upper pipe connector 120 or the branch pipe connector 140 is formed of transparent resin, a vibration damping material 714 is integrally provided with the pipe body 110 on at least a part of the outer surface of the pipe body 110, and the receiving portion of the upper pipe connector 120 or the receiving portion of the branch pipe connector 140 is not provided with any obstruction that would prevent the transparent resin from being seen. Thus, in this drainage pipe joint 100, before installation, a vibration damping material 714 is integrally provided with the pipe body 110 on at least a portion of the outer surface of the pipe body 110 that passes through the through-hole in the floor slab S, the upper pipe connection portion 120 or the lateral branch pipe connection portion 140 is formed of transparent resin, and the receiving portion of the upper pipe connection portion 120 or the receiving portion of the lateral branch pipe connection portion 140 is not equipped with any obstruction that would prevent the transparent resin from being seen.

[0074] As shown in Figure 5, the drainage pipe joint 100 has an upper riser pipe connection portion 120 or a lateral branch pipe connection portion 140 made of transparent resin (including both colorless and colored transparent resins), and before construction, the receiving portion of the upper riser pipe connection portion 120 or the receiving portion of the lateral branch pipe connection portion 140 is not equipped with any obstruction that would prevent the transparent resin from being seen. In this case, vibration damping material 714 is provided in places other than the receiving portion of the upper riser pipe connection portion 120 or the receiving portion of the lateral branch pipe connection portion 140 before construction, but it is also acceptable for these vibration damping materials 714 not to be provided at all and to be added after construction.

[0075] In a construction method for installing a drainage pipe joint 100, which further possesses such structural features, by placing it in a penetration hole in the floor slab S of a building, the fitting state between the upper riser pipe connection part 120 and the drainage riser pipe 520 is visually recognized (while recognizing) through the transparent resin of the upper riser pipe connection part 120, and the fitting state between the horizontal branch pipe connection part 140 and the horizontal drainage branch pipe 510 is visually recognized (while recognizing) through the transparent resin of the horizontal branch pipe connection part 140, drainage The horizontal branch pipe 510 is connected to the horizontal branch pipe connection part 140.

[0076] Then, while visually confirming (recognizing) the receiving portion of the transparent resin, the drain riser pipe 520 is connected to the upper riser pipe connection part 120, and the drain side branch pipe 510 is connected to the side branch pipe connection part 140. Furthermore, after the drain 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 drain pipe fitting 100. Furthermore, after filling with this mortar M, a sound-insulating member is provided on the outer circumference of the upper pipe connection 120 or the outer circumference of the lateral branch pipe connection 140. This sound-insulating member is (basically) different from the sound-insulating cover 730 described above (including cases where it is the same), and is described as a general name that provides vibration damping and / or vibration isolation in addition to the sound-insulating properties as the name suggests. As an example of such a sound-insulating member, the vibration damping material 714 described above may be provided at the receiving portion, or a sound-insulating cover 730 formed of a vibration insulator 720, such as the rock wool described above, and / or a rubber cover made of EPDM, etc., may be provided instead of / in addition to the vibration damping material 714, or a sound-insulating cover formed of a vibration insulator made of glass wool different from rock wool and / or a cover made of polyvinyl chloride, etc., may be provided instead of / in addition to the vibration damping material 714. In this case, it is also preferable to provide the vibration damping material 714 on the inner layer side of the sound insulation member at the receiving portion of the upper pipe connection portion 120 or the lateral branch pipe connection portion 140 (and at other portions including the receiving portion if vibration damping material 714 has not been provided anywhere other than the receiving portion before construction).

[0077] In this case, the sound insulation member may be installed by covering the drain pipe joint 100 from the outer periphery, or the sound insulation member may include glass wool as a sound-absorbing material and a polyvinyl chloride sound-insulating sheet as a sound-insulating cover, and the sound-absorbing material made of glass wool may be fixed (including cases where it is fixed by sewing, adhesive, etc.) to the polyvinyl chloride sound-insulating cover on the outer layer (not the vibration-damping material 714 on the inner layer).

[0078] Thus, before the installation of the drainage pipe fitting 100, the receiving portion of the upper pipe connection part 120 or the horizontal branch pipe connection part 140, which is made of transparent resin, is not equipped with any obstruction that would prevent the transparent resin from being seen. Therefore, the fitting state between the upper pipe connection part 120 and the drainage riser pipe 520, or the fitting state between the horizontal branch pipe connection part 140 and the horizontal drainage branch pipe 510, can be visually recognized through the transparent resin, allowing the drainage pipes to be connected and thus reducing installation errors. Furthermore, since the sound insulation member containing rock wool or glass wool as a sound-absorbing material is attached to the drainage pipe fitting 100 after backfilling with mortar M, the outer diameter of the drainage pipe fitting 100 does not increase when backfilling with mortar M, making it easier to backfill with mortar M. Also, the possibility of moisture from the mortar M splashing onto the rock wool or glass wool and wetting them can be eliminated.

[0079] As described above, the connection portion of the drain pipe fitting 100 is formed of transparent resin, and before construction, the transparent resin of the receiving portion of these connection portions can be visually inspected (without any obstructions that would obscure the transparent resin of the receiving portion) before starting construction of the drain pipe fitting 100. This allows for visual confirmation of the connection status between the drain pipe fitting 100 and other drain pipes, thereby suppressing construction errors. Furthermore, since a sound-insulating member containing rock wool or glass wool as a sound-absorbing material is provided after mortar backfilling, it is easier to backfill with mortar M, and the possibility of the moisture in the mortar M wetting the rock wool or glass wool can be eliminated. After the construction of this drain pipe fitting 100, as described above, drainage vibration can be suppressed very effectively, fire resistance can be fully demonstrated, and high water-stopping performance can be achieved.

[0080] <Variation> In the embodiments described above, the sound insulation cover 730 was formed from 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 was common in that it possessed elasticity (stretchability). In the modified versions described below (Modified Version 1 and Modified Version 2 described later), the sound insulation cover differs in that it is made of hard resin and is equipped with an elastic material (rubber gasket).

[0081] In the above-described embodiment, the sound-insulating cover 730, which constitutes the outermost layer of the three-layer outer member of the drainage pipe fitting, is made of a rubber-based, elastomer-based, or olefin-based material and is elastic, exhibiting watertightness, sound insulation, and vibration isolation. When this sound-insulating cover 730 is set in the drainage pipe fitting (more precisely, when this sound-insulating cover 730 is set on the main body side of the drainage pipe fitting where 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-insulating cover are joined with adhesive to prevent water leakage. The workability of setting this sound-insulating cover 730 may be undesirable.

[0082] Although this is not a major problem with the drainage pipe fitting according to the above-described embodiment, when setting the sound insulation cover 730, the procedure involves, for example, applying adhesive, stretching the sound insulation cover using its elasticity (to enlarge the inner diameter), placing the sound insulation cover 730 over the drainage pipe fitting that is otherwise equipped with the sound insulation cover 730, wiping off any excess adhesive, and confirming that the adhesive has hardened and the sound insulation cover has been joined to the main body. Therefore, if the procedure is complicated, or if the adhesive takes time to harden, this setting work may take a considerable amount of time.

[0083] In contrast, the sound insulation cover for the drain pipe fitting according to this modified example does not have elasticity, and therefore has a fixed shape. The sound insulation cover is placed over the drain pipe fitting, which is otherwise equipped with parts other than the sound insulation cover (it cannot be stretched as it does not have elasticity, so it is not stretched), and an elastic material (rubber gasket) is provided between the inner surface of the sound insulation cover and the outer surface of the drain pipe fitting. The sound insulation cover is joined to the drain pipe fitting (without using adhesives, etc.) via this elastic material (rubber gasket), and the sound insulation cover, which combines an elastic material (rubber gasket) with the non-elastic sound insulation cover body in this way, exhibits watertightness, sound insulation, and vibration isolation.

[0084] The following describes the outlines of two modified versions (Modified Version 1, in which the elastic material (rubber gasket) is provided on the sound insulation cover side, and Modified Version 2, in which the elastic material (rubber gasket) is provided on the drain pipe fitting (main body) side). When describing matters common to the sound insulation cover 731 of the drain pipe fitting 101 in Modified Version 1 and the sound insulation cover 741 of the drain pipe fitting 103 in Modified Version 2, the same sound insulation cover 730 as in the above-described embodiment may be used as a representative example.

[0085] The soundproofing cover (more specifically, soundproofing cover 731 or soundproofing cover 741) of the drainage pipe fitting (more specifically, drainage pipe fitting 101 or drainage pipe fitting 103) according to this modified example includes a non-stretchable cover body (more specifically, soundproofing cover body 733 or soundproofing cover body 743) having a length corresponding to the total vertical length of the vibration insulator 720, and an elastic material (rubber packing) (more specifically, elastic material (rubber packing) 735 or elastic material (rubber packing) 745) is provided only at the upper end, or at both the upper and lower ends (here, not just at the upper end, but at both the upper and lower ends) between the cover body and the outer surface of the drainage pipe fitting. Here, the elastic material (rubber gasket) provided at the upper end functions as an upper end watertight seal, and the elastic material (rubber gasket) provided at the lower end functions as a lower end watertight seal. The sound insulation cover contacts the outer surface of the drain pipe joint via the elastic material (rubber gasket), providing watertightness through the sound insulation cover. Furthermore, by combining the elastic material (rubber gasket) with the sound insulation cover body, which does not have elasticity, the sound insulation cover exhibits not only watertightness but also sound insulation and vibration isolation.

[0086] Here, the elastic material (rubber packing) is provided on the inner circumferential surface of the sound insulation cover body (sound insulation cover body 733) or on the outer surface of the drainage pipe joint (lower part 905 of the water collection chamber of the horizontal branch pipe connection part 140). Furthermore, the cover body (sound insulation cover body 733 or sound insulation cover body 743) is preferably made of a hard resin.

[0087] Furthermore, 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 fitting via a ring-shaped, elastic ring elastic material (rubber ring) 900 that corresponds to the outer diameter of the drainage pipe fitting (more specifically, the outer diameter of the lower part 905 of the water collection chamber of the lateral branch pipe connection part 140). Note that this embodiment can also be applied to Modification 2 (it is simply illustrated in Modification 1 but not in Modification 2).

[0088] Furthermore, in the above-described embodiment, it is preferable that the vibration insulator 720 is provided so as to be intermittently fixed in the circumferential direction of the sound insulation cover 730 within the height range corresponding to the straight pipe section 116, and that the vibration insulator 720 is provided so as to be fixed at 2 to 4 points in the circumferential direction of the outer layer sound insulation cover 730. However, it is also preferable to fix it as follows: It is preferable that the vibration insulator 720 is fixed to the outer layer sound insulation cover 730 by being continuously or intermittently fixed around the outside of the vibration insulator 720 at at least one point in the height direction of the outer layer sound insulation cover 730.

[0089] The following will provide a more detailed explanation, including the materials used for soundproofing covers and elastic materials, as well as the installation method for drainage pipe fittings (some of which will be divided into two variations, Variation 1 and Variation 2). Here, the elastic material (rubber gasket) may be provided on the sound insulation cover side (modification example 1 described later) or on the drain pipe fitting (main body) side (modification example 2 described later), but regardless of these differences, the elastic material (rubber gasket) constitutes a part of the sound insulation cover. As will be explained in more detail later, in the drain pipe fitting 101 according to modification example 1, the sound insulation cover 731 is composed of a sound insulation cover body 733 and an elastic material (rubber gasket) 735, with the elastic material (rubber gasket) 735 provided on the inner circumferential surface of the sound insulation cover body 733, and in the drain pipe fitting 103 according to modification example 2, the sound insulation cover 741 is composed of a sound insulation cover body 743 and an elastic material (rubber gasket) 745, with the elastic material (rubber gasket) 745 provided on the outer circumferential surface of the drain pipe fitting 103. Furthermore, in both modified examples, this elastic material (rubber gasket) is provided only at the upper end, or at both the upper and lower ends, between the cover body and the outer surface of the drain pipe fitting, thereby providing watertightness as described above. And, as the sound insulation cover is configured in this modified example (i.e., the sound insulation cover is configured to include the elastic material (rubber gasket)), the sound insulation cover 731 or sound insulation cover 741 exhibits watertightness, sound insulation, and vibration isolation, similar to the sound insulation cover 730 in the embodiment described above.

[0090] Here, the difference between the modified versions (Modification 1 and Modification 2) described in detail below and the drainage pipe fittings is that the sound insulation cover of the drainage pipe fitting in the above-described embodiment is made of a hard resin material, whereas the sound insulation cover of the drainage pipe fitting in the above-described embodiment was made of an elastic (stretchable) rubber-based material. It should be noted that the inclusion of a ring elastic material (rubber ring) 900 is also a difference, although this ring elastic material (rubber ring) 900 can also be used in the above-described embodiment. Other structural components that are the same as those in the above-described embodiment are denoted by the same reference numerals. Their descriptions will not be repeated here as they would be redundant with the above-described explanation.

[0091] In the modified drainage pipe joint, typical rigid resins used as the cover body (sound insulation cover body) of the sound insulation cover include polyvinyl chloride and polyethylene. Furthermore, it is also preferable to form such rigid 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).

[0092] Inorganic fillers are not particularly limited, but examples include 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, dohnite, 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 balloons, aluminum nitride, boron nitride, silicon nitride, carbon black, graphite, carbon fiber, carbon balloons, 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.

[0093] Of these, calcium carbonate is preferred as the inorganic filler due to the balance between weight and cost. These may be used individually or in combination of two or more. The olefin resin is not particularly limited, but examples include low-density polyethylene, high-density polyethylene, linear low-density polyethylene, atactic polypropylene, isotactic polypropylene, syndiotactic polypropylene, and poly-αolefin. Furthermore, the material may be made of a material other than olefin-based materials; for example, polyvinyl chloride resin, polystyrene resin, ABS resin, AS resin, elastomer material, etc. (as mentioned above) may be used. In the following modified examples, the rigid resin used as the soundproofing cover body will be described as polyvinyl chloride.

[0094] Here, in the modified drainage pipe joint, the elastic material (rubber) that constitutes part of the sound insulation cover is present. Materials used as packing materials are generally those that can be used as so-called packing materials. Rubber materials include, typically, EPDM (ethylene propylene diene rubber) and SBR (styrene butadiene rubber). In addition to these, thermoplastic elastomers and polyethylene foam can also be used. In the following modified examples, the rubber material used as the elastic material (rubber gasket) for the sound insulation cover will be explained assuming that it is EPDM (ethylene propylene diene rubber). Furthermore, while there are no limitations on the material used for the ring elastic material (rubber ring), the same material as the elastic material (rubber gasket) mentioned above can be used.

[0095] <Variation 1: Elastic material (rubber gasket) on the sound insulation cover side> Referring to Figures 16 and 17, the drainage pipe joint 101 according to the first modification will be described in detail. Figure 16 is a cross-sectional view showing a drainage pipe structure in which the drainage pipe joint 101 according to the first modification is used, and Figure 17 is a diagram to explain the state in which the sound insulation cover 731 (more precisely, the sound insulation cover 731 consisting of a sound insulation cover body 733 and an elastic material (rubber packing) 735, and optionally a vibration insulator 720) is set in the drainage pipe joint 101 of Figure 16 (for example, not at the construction site, but at the manufacturing plant of the drainage pipe joint 101).

[0096] As shown in these figures, the sound insulation cover 731 of the drainage pipe joint 101 according to this modified example is a non-stretchable sound insulation cover with a length corresponding to the total vertical length of the vibration insulator 720. The soundproof cover body 733 is included, and an elastic material (rubber packing) 735 is provided only at the upper end, or at both the upper and lower ends, between the soundproof cover body 733 and the outer surface of the drain pipe fitting 101. In these figures, the elastic material (rubber packing) 735 is provided at both ends of the upper and lower ends between the soundproof cover body 733 and the outer surface of the drain pipe fitting 101, but it may also be provided only at the upper end. This elastic material (rubber packing) 735 enables the drain pipe fitting 101 to exhibit watertightness, sound insulation, and vibration isolation (same as in the above-described embodiment, although the material of the soundproof cover body is different). Here, in the case where the elastic material (rubber packing) 735 is provided on the sound insulation cover body 733 to constitute 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 body 733 + elastic material (rubber packing) 735) is set on the drainage pipe fitting (body) or in the case where a construction method is adopted in which the sound insulation cover 731 (sound insulation cover body 733 + elastic material (rubber packing) 735) is set in the through hole before installing the drainage pipe fitting (body)), the elastic material (rubber packing) 735 is provided in the recesses on the inner circumferential surface of the sound insulation cover body 733 (more specifically, the upper recess 733DU and the lower recess 733DD) (so that it fits into the recesses). Here, regarding these two recesses, if the elastic material (rubber packing) 735 is only provided on the upper side, the lower recess 733DD does not need to be provided on the sound insulation cover body 733. Furthermore, as shown in Figure 17, this elastic material (rubber packing) 735 has a return portion with a L-shaped cross-section to facilitate insertion of the drain pipe fitting 101 other than the sound insulation cover 731 from above the sound insulation cover 731 and to prevent it from coming loose during insertion.

[0097] In this modified example, the elastic material (rubber packing) 735 is provided on the inner circumferential surface of the sound insulation cover body 733, which is different from the drainage pipe joint 103 in Modified Example 2, where it is provided on the outer circumferential surface of the drainage pipe joint. As mentioned above, although not limited to it, the sound insulation cover body 733 is made of hard resin.

[0098] In order for the drainage 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 drainage pipe joint 101 (however, the fact that the sound insulation cover 731 has a portion where it is the innermost layer because the elastic material (rubber packing) 735 that constitutes the outermost sound insulation cover 731 abuts against the outer surface of the drainage pipe joint 101 is ignored because the contact area of ​​the elastic material (rubber packing) 735 is small): vibration damping material 714 (or heat expandable fire-resistant sheet 712), vibration insulator 720 made of fire-resistant inorganic fibers, and sound insulation cover 731 (sound insulation cover body 733 and elastic material (rubber packing) 735).

[0099] Thus, in the drainage pipe joint 101 according to this modified example, the elastic material (rubber packing) 735 is provided on the inner circumferential 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 that the sound insulation cover 731 (more precisely, the sound insulation cover body 733 and the elastic material (rubber packing) 735 that constitute the sound insulation cover 731, and also optionally the vibration insulator 720) is set into the drainage pipe joint 101 (more precisely, the sound insulation cover body 733 and the elastic material (rubber packing) 735 that constitute the sound insulation cover 731, and everything except the vibration insulator 720).

[0100] Here, as shown in Figure 17, the sound insulation cover 731 abuts against the outer surface of the drain pipe fitting 101 via a ring-shaped, elastic ring elastic material (rubber ring) 900 that corresponds to the outer diameter of the drain pipe fitting 101. The connection between the lateral branch pipe connection part 140 and the pipe body 110 in this drain pipe fitting 101 is such that the lateral branch pipe connection part 140 is fitted inside the pipe body 110 (the inner circumferential surface of the fitting part 902 of the pipe body 110 and the outer circumferential surface of the fitting part 904 of the lateral branch pipe connection part 140 are joined), and the outer circumferential surface of the lateral branch pipe connection part 140 and the outer circumferential surface of the pipe body 110 are as shown in the white outlined three in Figure 17. As indicated by the square mark, a step is created on the pipe body 110 side, causing it to protrude. With this step present, as shown in Figure 17, when setting the sound insulation cover 731 (or more precisely, the sound insulation cover 731 plus the optional vibration insulator 720) to the drainage pipe joint 101 (or more precisely, everything except the sound insulation cover 731 and vibration insulator 720), it may be difficult to set the sound insulation cover 731 due to this step. For this reason, to eliminate this step, a ring elastic material (rubber ring) 900 is provided on the outer surface of the lower part 905 of the water collection chamber of the lateral branch pipe connection part 140, and the step is eliminated as indicated by the black and white triangle marks.

[0101] This ring elastic material (rubber ring) 900 has an inner diameter that corresponds to the outer diameter of the fitting portion 904 of the lateral branch pipe connection portion 140 (= 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 body 110. When this ring elastic material (rubber ring) 900 is set on the fitting portion 904 of the lateral branch pipe connection portion 140, the outer diameter of the ring elastic material (rubber ring) 900 is at the position indicated by the black triangle mark, and becomes approximately equal to the outer diameter of the fitting portion 902 of the pipe body 110 indicated by the white triangle mark. This eliminates the aforementioned step difference and improves the workability of setting the sound insulation cover 731 (more precisely, the sound insulation cover 731 plus the optional vibration insulator 720) on the drainage pipe joint 101 (more precisely, everything except the sound insulation cover 731 and vibration insulator 720). This ring elastic material (rubber ring) 900 can be preferably applied not only to the two modified examples, but also when the sound insulation cover body is made of a rubber-based material such as EPDM (i.e., all drainage pipe fittings according to the embodiments described above).

[0102] In all the embodiments described above, the vibration insulator 720 was fixed to the outer layer sound insulation cover 730 by spot fixing at 2 to 4 locations in the circumferential direction, but the present invention is not limited thereto. For example, in the drainage pipe joints according to all the embodiments described above, as well as in the drainage pipe joints according to all the modifications (modification 1, modification 2), the vibration insulator 720 may be fixed to the outer layer sound insulation cover by fixing the outer circumference of the vibration insulator 720 continuously or intermittently at at least one location in the height direction of the outer layer sound insulation cover. By loosely fixing a vibration insulator 720, such as a rock wool sheet, as an intermediate layer, to the outer sound insulation cover rather than the vibration damping material 714 on the inner layer, with the outer circumference being continuous or intermittent, sound absorption, fire resistance (when a thermally expandable fire-resistant material is provided in place of / in addition to the vibration damping material 714), sound insulation, and vibration insulation can be achieved. Furthermore, by providing a sound insulation cover 730, such as a soft EPDM rubber cover, or a hard polyvinyl chloride cover, such as a rigid polyvinyl chloride cover (sound insulation cover body 733 and elastic material (rubber packing) 735), as the outermost layer, watertightness, sound insulation, and vibration insulation can be achieved, thereby very effectively suppressing vibrations generated in the drainage pipe joint. As described above, the drainage pipe joint 101 according to this modified example can also exhibit the same effects and advantages as the drainage pipe joint according to the embodiment described above.

[0103] <Modification 2: Elastic material (rubber gasket) on the drain pipe fitting (main body) side> Referring to Figures 18 and 19, the drainage pipe fitting 103 according to the second modification will be described in detail. Figure 18 is a cross-sectional view showing a drainage piping structure in which the drainage pipe fitting 103 according to the second modification is used, and Figure 19 is a diagram to explain the state in which the sound insulation cover 741 (more precisely, only the sound insulation cover body 743) is set in the drainage pipe fitting 103 of Figure 18 (for example, at the manufacturing plant of the drainage pipe fitting 103 rather than at the construction site).

[0104] In the drainage pipe fitting 101 according to Modification 1 and the drainage pipe fitting 103 according to Modification 2, in the drainage pipe fitting 101, an elastic material (rubber packing) 735 is provided on the inner circumferential surface of the sound insulation cover body 733 of the sound insulation cover 731, whereas in the drainage pipe fitting 103, an elastic material (rubber packing) 74 is provided on the outer circumferential surface of the drainage pipe fitting 103 (more specifically, the lower part 905 of the water collection chamber of the horizontal branch pipe connection part 140) (not the sound insulation cover body 743 of the sound insulation cover 741). The difference is that section 5 is provided. The other components of the drainage pipe fitting 103 according to this modified example are the same as those of the drainage pipe fitting 101 according to the first modified example described above, so a detailed explanation will not be repeated here. Note that in the drainage pipe fitting 103 according to this modified example, the ring elastic material (rubber ring) 900 is an optional requirement (basically unnecessary) in the present invention and is therefore not shown.

[0105] In order for the drainage 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 drainage pipe joint 103 (however, the fact that the sound insulation cover 741 has a portion where it is the innermost layer because the elastic material (rubber packing) 745 constituting the outermost sound insulation cover 741 abuts against the outer surface of the drainage pipe joint 103 is ignored because the contact area of ​​the elastic material (rubber packing) 745 is small): vibration damping material 714 (or heat expandable fire-resistant sheet 712), vibration insulator 720 made of fire-resistant inorganic fibers, and sound insulation cover 741 (sound insulation cover body 743 and elastic material (rubber packing) 745 provided on the outer surface of the drainage pipe joint 103).

[0106] Thus, in the drain pipe fitting 103 according to this modified example, since the elastic material (rubber packing) 745 is provided on the outer surface of the drain pipe fitting 103, the sound insulation cover 741 (more precisely, only the sound insulation cover body 743 of the sound insulation cover 741) is set on the drain pipe fitting 103 (more precisely, everything except the sound insulation cover body 743 of the sound insulation cover 741). As described above, the drainage pipe joint 103 according to this modified example can also exhibit the same effects and advantages as the drainage pipe joint according to the embodiment described above.

[0107] <Construction methods for modified version 1 and modified version 2> Referring to Figures 20 and 21, the installation method of drainage pipe fitting 101 according to Modification 1 and the installation method of drainage pipe fitting 103 according to Modification 2 will be briefly explained. This installation method is not the method of manufacturing drainage pipe fittings at the drainage pipe fitting manufacturing plant shown in Figures 17 and 19, but rather an installation method in which drainage pipe fittings are installed in through holes made in the floor slab S of a building, which is the installation site for drainage pipe fittings.

[0108] A distinctive feature of this construction method is that the sound insulation cover is set into the through-hole in the floor slab S, embedded in the floor slab S with a filler M such as mortar, and then the drainage pipe fittings other than the sound insulation cover are set into the embedded sound insulation cover. Furthermore, the construction method for the drainage pipe fitting according to the present invention may also be the (conventional) construction method in which the drainage pipe fitting with the sound insulation cover attached (i.e., the completed drainage pipe fitting including the sound insulation cover) is set into a through-hole in the floor slab S and the drainage pipe fitting is embedded in the floor slab S with a filler M such as mortar. That is, as shown in Figure 17, the sound insulation cover is attached (at the drainage pipe fitting manufacturing plant, etc.) and the drainage pipe fitting 101 is completed as shown in Figure 16, and then the completed drainage pipe fitting 101 is set into a through-hole in the floor slab S and the drainage pipe fitting 101 is embedded in the floor slab S with a filler M such as mortar, or as shown in Figure 19, the sound insulation cover is attached (at the drainage pipe fitting manufacturing plant, etc.) and the drainage pipe fitting 103 is completed as shown in Figure 18, and then the completed drainage pipe fitting 103 is set into a through-hole in the floor slab S and the drainage pipe fitting 103 is embedded in the floor slab S with a filler M such as mortar.

[0109] In the drainage pipe joint 101 according to the first modified example, as shown in Figure 20, a sound insulation cover 731 (more precisely, a sound insulation cover 731 consisting of a sound insulation cover body 733 and an elastic material (rubber packing) 735, and optionally a vibration insulator 720) is set in a through hole in the floor slab S and the sound insulation cover 731 is embedded in the floor slab S with a filler M such as mortar, and then the drainage pipe joint 101 (more precisely, the sound insulation cover 731 and vibration insulator) is attached to the embedded sound insulation cover 731 (more precisely, the sound insulation cover 731 and vibration insulator 720) Set a value other than 720.

[0110] In the drainage pipe fitting 103 according to the second modification, as shown in Figure 21, the sound insulation cover 741 (more precisely, only the sound insulation cover body 743) is set into the through hole of the floor slab S and embedded in the floor slab S with a filler M such as mortar. Then, the drainage pipe fitting 101 (more precisely, the parts of the sound insulation cover 741 other than the sound insulation cover body 743) is set onto the embedded sound insulation cover 741 (more precisely, only the sound insulation cover body 743 of the sound insulation cover 741).

[0111] In this way, the sound insulation cover can be embedded in the through-hole of the floor slab S beforehand, and then the drainage pipe fittings other than the sound insulation cover can be inserted from above the sound insulation cover and integrated. For this reason, if void tubes are erected vertically and fixed to the subfloor before the concrete is poured for the floor slab S, and concrete is poured around them to create a concrete floor, and then cured, and the voids formed inside the void tubes are used as through-holes, then normally it is necessary to pull out the void tubes made of paper, resin, or metal after curing (metal void tubes may not be pulled out) and fill the gap between the through-hole and the drainage pipe fitting with a filler material. However, if a sound insulation cover is used instead of such void tubes (by erecting and fixing the sound insulation cover vertically to the subfloor before the concrete is poured for the floor slab S, and then pouring concrete around it to create a concrete floor), it is preferable because it eliminates the need to fill the gap between the through-hole and the drainage pipe fitting with a filler material (and also eliminates the need to pull out the void tubes since void tubes are not used in the first place). In this case, it is preferable that the length of the soundproofing cover be the same as or shorter than the thickness of the slab (so as not to interfere with on-site work such as pouring concrete around the soundproofing cover).

[0112] Furthermore, when performing construction in this manner, if the drainage pipe joints are to be replaced, it is preferable that only the sound insulation cover is left in the penetration hole of the floor slab S, and everything else is replaced. Here, in order to shorten the construction period, it is conceivable that the drainage pipe fittings be pre-cast into the PC (precast concrete) panels at the PC panel manufacturing plant. In this case, instead of first drilling through holes in the floor slab S and then installing the drainage pipe fittings in those through holes and filling the gaps (the gaps between the through holes and the drainage pipe fittings) with filler material, it is conceivable that the drainage pipe fittings would be directly embedded into the PC panels at the PC panel manufacturing plant. Based on this assumption, it is conceivable that the sound insulation cover would be directly embedded (cast) into the PC panel in advance, similar to using a sound insulation cover instead of the void tubes mentioned above. In other words, since the gap between the drainage pipe fitting and the through hole in the floor slab would not be filled with filler material, in this modified version of the present invention, filling the gap with filler material may not be an essential requirement in the construction method. Even in this case, as mentioned above, it is preferable that the length of the sound insulation cover be the same as or shorter than the thickness of the slab (in this case, the thickness of the PC panel) (so as not to interfere with the PC panel manufacturing work of pouring concrete around the sound insulation cover).

[0113] As mentioned above, the present invention does not exclude the possibility of installing a drainage pipe fitting in the floor slab S by inserting the completed drainage pipe fitting shown in Figures 16 and 18, including the sound insulation cover, into a through-hole in the floor slab S, without first embedding any of the components constituting the drainage pipe fitting in the floor slab S, as shown in Figures 17 and 19, and filling the space between the outer surface of the drainage pipe fitting (in this case, the outermost surface is the sound insulation cover) and the inner surface of the through-hole with a filler M such as mortar.

[0114] It should be noted that the embodiments disclosed herein are illustrative and not restrictive in all respects. The scope of the present invention is indicated by the claims rather than by the foregoing description, and all modifications within the meaning and scope equivalent to the claims are intended to be included. [Industrial applicability]

[0115] The present invention is preferable for drainage pipe joints installed through the floor slab S of a building, and is particularly preferable for drainage pipe joints installed through the floor slab of a building, in that it can exhibit optimal vibration damping performance, vibration isolation performance, and sound insulation performance. [Explanation of Symbols]

[0116] 100, 200 Drainage pipe fittings 110, 210 pipe body 112, 212 indentations 114 Swivel blades 120 Upper riser pipe connection 130, 230 Drain pipe connection 140 Horizontal branch pipe connection 142 Water collection room 144, 146, 148 Horizontal branch pipe connecting members 520 (upper floor side) drain riser 530 (lower floor side) drainage standpipe 540 (lower floor side) 90-degree (compact) vent pipe 612 Thermal expandable fireproofing materials 700, 800 Outer layer member 710 Innermost layer 712 Thermally expandable fire-resistant sheet 714 Damping material 720, 820 (Vibration insulator formed from fire-resistant inorganic fibers) 730 Soundproof Cover

Claims

1. A drainage pipe joint comprising: a pipe body positioned in a penetration hole in a floor slab when installed in a building; an upper riser connection part that protrudes above the floor slab and connects to a drain riser pipe that allows drainage from the upper floor to flow in; a drain pipe connection part that protrudes below the floor slab and connects to a drain pipe that allows drainage to flow out to the lower floor; and a horizontal branch pipe connection part that connects to a horizontal drain pipe above the floor slab, A drainage pipe joint characterized by comprising a vibration damping material integrally provided on at least a portion of the outer circumferential surface of the pipe body, at least a portion of which passes through the through-hole.

2. The drainage pipe joint according to claim 1, characterized in that the vibration damping material is adhered to or bonded to the entire surface of the outer circumferential surface on which the vibration damping material is provided.

3. The drainage pipe joint according to claim 1 or claim 2, characterized in that the vibration damping material is formed in a sheet shape and wrapped around the outer surface.

4. The drainage pipe joint according to any one of claims 1 to 3, characterized in that a vibration insulator is further provided on the outer circumference of the vibration damping material.

5. The drainage pipe joint according to claim 4, characterized in that a sound-insulating cover is provided on the outer circumference of the vibration insulator.

6. The drainage pipe joint according to claim 5, characterized in that the vibration insulator is fixed to the sound insulation cover on the outer layer side.

7. The pipe body comprises at least a straight pipe section and a reduced diameter section below the straight pipe section. The drainage pipe joint according to claim 5 or claim 6, characterized in that the vibration insulator is intermittently fixed in the circumferential direction of the sound insulation cover within a height range corresponding to the straight pipe portion.

8. The drainage pipe joint according to any one of claims 5 to 7, characterized in that the vibration insulator is fixed by spot fastening at two to four locations in the circumferential direction of the sound insulation cover on the outer layer side.

9. The aforementioned drainage pipe fitting is formed from one or more injection-molded resin parts, A drainage pipe joint according to any one of claims 1 to 8, characterized in that a portion of the outer surface is provided with a sheet-like thermally expandable fire-resistant material in place of at least a part of the vibration damping material.

10. The aforementioned drainage pipe fitting is formed from one or more injection-molded resin parts, The pipe body comprises at least a straight pipe section and a reduced diameter section below the straight pipe section. A drainage pipe fitting according to any one of claims 5 to 8, characterized in that a heat-expandable fire-resistant material is provided on the inner layer side of the vibration insulator in place of a part 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 corresponding to the straight pipe section.

11. The drainage pipe fitting according to any one of claims 1 to 10, characterized in that the vibration damping material is formed by comprising a butyl-based or asphalt-based material, and the sound insulation cover is formed by comprising a rubber-based, elastomer-based, or olefin-based material.

12. The sound-insulating cover has a length corresponding to the entire vertical length of the vibration-insulating body and is expandable. Including the cover body which is not provided, The drainage pipe fitting according to claim 5, characterized in that an elastic material is provided only at the upper end, or at both the upper and lower ends, between the cover body and the outer surface of the drainage pipe fitting.

13. The drainage pipe fitting according to claim 12, characterized in that the elastic material is provided on the inner circumferential surface of the cover body or on the outer surface of the drainage pipe fitting.

14. The drainage pipe fitting according to claim 12 or claim 13, characterized in that the cover body is made of hard resin.

15. The drainage pipe fitting according to any one of claims 5 to 8 and 10, characterized in that the sound-insulating cover abuts against the outer surface of the drainage pipe fitting via a ring-shaped, elastic ring elastic material corresponding to the outer diameter of the drainage pipe fitting.

16. The drainage pipe joint according to claim 5, characterized in that the vibration insulator is fixed to the sound insulation cover on the outer layer side by fixing a full circumference of the outer surface of the vibration insulator at at least one location in the height direction of the sound insulation cover on the outer layer side, either continuously or intermittently.

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