Drainage pipe fittings and drainage equipment

Abstract

To provide a drainage piping joint 100 which can prevent formation of a gap between a thermally expandable refractory material 116 and a sound absorbing material 151 and can prevent propagation of drainage sound into a living space.SOLUTION: The drainage piping joint comprises: a pipe body 110 with a pit 112 formed in an outer peripheral surface; the thermally expandable refractory material 116 embedded in the pit 112; and the sound absorbing material 151 wound around the pipe body 110. A seam of the sound absorbing material 151 in the circumferential direction of the pipe body 110 does not overlap the thermally expandable refractory material 116.SELECTED DRAWING: Figure 2

Description

Technical Field

[0001] The present invention relates to a drainage pipe joint and drainage facilities.

Background Art

[0002] Generally, buildings such as apartment houses and office buildings are provided with water supply facilities and drainage facilities. Among these, the drainage facilities typically include riser pipes provided in the vertical direction of the building and horizontal pipes provided in the horizontal direction on each floor. The drainage flowing down these riser pipes and horizontal pipes is aggregated at one or several locations by drainage pipe joints. Then, it is drained to drainage facilities outside the building.

[0003] In a building having multiple floors, a drainage facility that penetrates the vertical direction of the building is required. For this reason, the drainage pipe joint is mainly provided in a through-hole provided in the floor slab of each floor. At this time, when a fire occurs in the building, smoke and toxic gas enter the upper floors through the drainage pipe joint and the riser pipe. Therefore, in order to seal the inside of the drainage pipe joint during a fire, the drainage pipe joint is provided with a heat-expandable refractory material. In the drainage pipe structure described in Patent Document 1 below, the heat-expandable refractory material is embedded in a recess provided on the outer surface of the drainage pipe joint.

[0004] In addition, when drainage is aggregated from the riser pipe and the horizontal pipe to the drainage pipe joint, a large amount of drainage may flow down at once in some cases. At this time, vibration is generated by the momentum of the water flowing into the drainage pipe joint and becomes drainage noise, which propagates to the surroundings. In order not to propagate this drainage noise into the living rooms of the building, a sound-absorbing material is provided around the drainage pipe joint.

Prior Art Documents

Patent Documents

[0005]

Patent Document 1

Summary of the Invention

[0006] However, when a strip of sound-absorbing material is wrapped around a drainage pipe fitting, if the thermally expandable fire-resistant material and the sound-absorbing material overlap, problems arise such as the inability to confirm the presence or absence of the fire-resistant material during fitting manufacturing.

[0007] The present invention has been made in view of the circumstances described above, and aims to provide a drainage pipe fitting that allows for easy confirmation of the presence or absence of a heat-expandable fire-resistant material even when sound-absorbing material is installed. [Means for solving the problem]

[0008] To solve the aforementioned problems, the present invention proposes the following means. The drainage pipe joint according to the present invention comprises a main pipe having a recess formed on its outer surface, a heat-expandable fire-resistant material embedded in the recess, and a sound-absorbing material wrapped around the main pipe, wherein the joints of the sound-absorbing material in the circumferential direction of the main pipe are superimposed radially with respect to the recess.

[0009] Here, the term "joint of sound-absorbing material" refers to the overlapping portion of the sound-absorbing material when both circumferential ends of the sound-absorbing material overlap radially. Furthermore, when both circumferential ends of the sound-absorbing material are butted together circumferentially (the circumferential ends of the sound-absorbing material face each other circumferentially), the term "joint of sound-absorbing material" refers to the portion where the ends of the sound-absorbing material are in contact, or the gap between the ends of the sound-absorbing material.

[0010] According to this invention, the joints of the sound-absorbing material in the circumferential direction of the main pipe are overlapped radially with respect to the recess. This makes it easy to check for the presence or absence of thermally expandable fire-resistant material by slightly peeling back the sound-absorbing material.

[0011] Furthermore, at the joints of the sound-absorbing material, the circumferential ends of the sound-absorbing material may be overlapped.

[0012] Furthermore, at the joints of the sound-absorbing material, the circumferential ends of the sound-absorbing material may be butted together.

[0013] Furthermore, the protrusion corresponding to the recess may be provided at an angle with respect to the axial direction of the main pipe.

[0014] According to this invention, the protruding portion is provided at an inclination with respect to the axial direction of the main pipe. As a result, the wastewater flowing through the main pipe moves in a spiral motion, that is, it generates a vortex within the main pipe. Therefore, drainage can be performed more efficiently.

[0015] Furthermore, multiple recesses may be provided in the circumferential direction of the main pipe.

[0016] According to this invention, multiple recesses are provided in the circumferential direction of the main pipe. This allows for an increase in the amount of heat-expandable fire-resistant material that can be embedded in the recesses. Furthermore, multiple pieces of heat-expandable fire-resistant material can be provided in the circumferential direction. In other words, the heat-expandable fire-resistant material can be expanded more efficiently. Therefore, in the event of a fire, the space between the floor slab and the main pipe can be sealed more efficiently. Moreover, if multiple protrusions are provided inside the main pipe, this can help to further regulate the direction of the flow.

[0017] Furthermore, a sound-insulating cover may be fixed to the outer circumference of the sound-absorbing material wrapped around the main pipe.

[0018] According to this invention, a sound-insulating cover is fixed to the outer circumference of the sound-absorbing material. This allows the sound-absorbing material to be wrapped together with the sound-insulating cover when wrapping it around the main pipe, making it easier to join the joints.

[0019] Furthermore, the recess may have a lid member made of the heat-expandable fire-resistant material.

[0020] According to the present invention, the recess has a lid member made of a thermally expandable refractory material. By this, it is possible to prevent the thermally expandable refractory material from falling off the drainage pipe joint during construction.

[0021] Further, the thermally expandable refractory material may be shaped to fit the shape of the recess.

[0022] According to the present invention, the thermally expandable refractory material is shaped to fit the shape of the recess. By this, it is possible to facilitate attaching the thermally expandable refractory material to the recess during the manufacture of the drainage pipe joint.

[0023] Moreover, a drainage facility provided with the above-described drainage pipe joint includes a riser pipe, a horizontal branch pipe, and the drainage pipe joint, and the riser pipe and the horizontal branch pipe are connected to the main pipe.

[0024] According to the present invention, the riser pipe and the horizontal branch pipe are connected to the main pipe. By this, it is possible to minimize the locations where the drainage facility penetrates the floor slabs of each floor. Therefore, it is possible to more effectively utilize the space within the building.

Advantages of the Invention

[0025] According to the present invention, it is possible to provide a drainage pipe joint that can easily confirm the presence or absence of a thermally expandable refractory material even when a sound-absorbing material is attached.

Brief Description of the Drawings

[0026] [Figure 1] It is a schematic view of a building in which a drainage pipe joint according to an embodiment of the present invention is constructed. [Figure 2] It is a cross-sectional view of a part where a drainage pipe joint according to an embodiment of the present invention is constructed. [Figure 3] It is a perspective view of a drainage pipe joint according to an embodiment of the present invention. [Figure 4] It is a perspective view showing a state in which an expandable refractory material is attached to a drainage pipe joint according to an embodiment of the present invention. [Figure 5]This is a cross-sectional view of a portion of a drainage pipe joint according to one embodiment of the present invention in which an expandable fire-resistant material has been attached. [Figure 6] Figure 5 shows a drainage pipe fitting with an outer layer member attached, where the joints where both ends of the outer layer member are butted in the circumferential direction do not overlap radially with the heat-expandable fire-resistant material. [Figure 7] Figure 5 shows a drainage pipe fitting with an outer layer member attached, where the joints where both ends of the outer layer member are butted in the circumferential direction overlap radially with the heat-expandable fire-resistant material. [Figure 8] Figure 5 shows a drainage pipe fitting with an outer layer member attached, where the radially overlapping joints of both ends of the outer layer member do not overlap radially with the heat-expandable fire-resistant material. [Figure 9] Figure 5 shows the state in which an outer layer member is attached to a drainage pipe fitting, and the joints where both ends of the outer layer member overlap radially are radially overlapped with the heat-expandable fire-resistant material. [Figure 10] This is a modified example of a part of a drainage pipe joint according to one embodiment of the present invention in which an expandable fire-resistant material is attached. [Figure 11] Figure 10 shows the state in which an outer layer member is attached to a drainage pipe fitting, and the joints where both ends of the outer layer member overlap radially are overlapped radially with the heat-expandable fire-resistant material. [Figure 12] This figure shows the state in which an outer layer member is attached to the drainage pipe fitting shown in Figure 10, and the joints where both ends of the outer layer member are butted in the circumferential direction overlap radially with the heat-expandable fire-resistant material. [Figure 13] Figure 5 shows a modified example of the drainage pipe joint in which a cover member is provided at the part where the heat-expandable fire-resistant material is attached. [Figure 14] This is an exploded view of a soundproofing cover according to one embodiment of the present invention. [Figure 15] This is a development drawing of a sound-absorbing material relating to one embodiment of the present invention. [Figure 16] Figure 14 shows a modified example in which the sound insulation cover is divided into two parts. [Figure 17] This is a detailed view of the pipe body according to one embodiment of the present invention. [Figure 18]Figure 2 shows a modified example in which a soundproofing cover is installed near the water collection chamber of the drainage pipe joint. [Figure 19] Figure 2 shows a modified example in which a sound-insulating cover is provided near the water collection chamber of the drainage pipe joint, and tape is provided at both ends of the outer layer member. [Figure 20] Figure 2 shows a modified example in which a swivel vane is installed inside the water collection chamber of the drainage pipe fitting. [Figure 21] Figure 2 shows a modified example in which the stopper is located inside the water collection chamber. [Modes for carrying out the invention]

[0027] A drainage pipe fitting according to one embodiment of the present invention will be described below with reference to the drawings. As shown in Figure 1, the drainage pipe fitting 100 collects wastewater flowing down from facilities on each floor of the building 10 (for example, the bathroom 11, washing machine 12, and washbasin 13). The collected wastewater flows down to the lower floors via the drainage riser 200 and is drained to the drainage facility 20 outside the building 10.

[0028] As shown in Figure 2, the drainage piping structure using this drainage pipe fitting 100 has a non-fire-resistant resin drainage pipe fitting 100 installed in a through-hole that penetrates vertically through the floor slab S in the building, and a resin drainage riser connected to this drainage pipe fitting 100 (an upper-floor side drainage riser 220 that allows drainage from the upper floor to flow in, and a lower-floor side drainage riser 230 that allows drainage to flow down to the lower floor). Here, "non-fire-resistant" refers to a property that allows deformation, melting, or combustion due to the heat caused by a fire in the building, and resin materials are an example of this.

[0029] The drainage pipe fittings 100 and drainage risers (upper floor drainage riser 220 and lower floor drainage riser 230) are molded from materials such as polyvinyl chloride, polyethylene, polybutene, polypropylene, or nylon. For example, so-called fire-resistant double-layer pipes may be used for the drainage risers. As shown in Figures 3 and 4, this drainage pipe fitting 100 is formed from one or more (in this example, six) injection-molded resin parts. As shown in Figures 2, 3, and 4, when installed in a building, this drainage pipe fitting 100 comprises a pipe body (main pipe) 110 positioned in a through-hole in the floor slab S, an upper riser connection part 120 for connecting an upper-floor side drain riser pipe 220 that protrudes above the floor slab S and allows drainage from the upper floor to flow in, a lower riser connection part 130 for connecting a lower-floor side drain riser pipe 230 that protrudes below the floor slab S and allows drainage to flow down to the lower floor, and a horizontal branch pipe connection part 140 for connecting a horizontal drainage branch pipe 300 above the floor slab S. A distinctive feature is that, as shown in Figures 3, 4, and 5, a swivel vane 114 is formed as a projection that protrudes from the inner surface of the pipe body 110 between the lateral branch pipe connection portion 140 and the lower vertical pipe connection portion 130 of the pipe body 110, and a recess 112 corresponding to this swivel vane 114 is formed on the outer surface of the pipe body 110, and a heat-expandable fire-resistant material 116 is filled into this recess 112.

[0030] As shown in Figure 2, when the swivel blade 114 is installed in a building, at least a portion of the recess 112 is formed in a position corresponding to at least a portion of the range from the upper end to the lower end of the floor slab S. Here, the swirling vane 114 is not limited to a swirling vane 114, but can be a flow deflector or the like, as long as it is a part that changes the flow of drainage within the drainage pipe joint 100, and is not limited to a swirling vane or a flow deflector, as long as it forms a recess 112 corresponding to the outer surface of the pipe body 110.

[0031] Furthermore, it is preferable to provide an outer layer member 150 with fire-resistant and vibration-suppressing properties on the outer layer of the heat-expandable fire-resistant material 116, wrapped around the outer circumference of the pipe body 110. Examples of this outer layer member 150 include rock wool or glass wool. The drainage pipe fitting 100, which has these characteristics, will be described in more detail. In addition to the above-described configuration, the drain pipe joint 100 includes, as shown in Figure 3 or Figure 4, a drain collection chamber 142 with three openings at 90° intervals in a plan view, and with vertical ribs formed inside to prevent drainage flowing from one drain branch pipe 300 from flowing back into the other drain branch pipes 300, and a first, second, and third drain branch pipe connecting member 144, 146, and 148 for connecting the drain branch pipes 300 corresponding to the positions of the openings. Hereafter, the first, second, and third drain branch pipe connecting members 144, 146, and 148 may be collectively referred to as drain branch pipe connecting members 144, 146, and 148.

[0032] Furthermore, as described above, the drainage pipe joint 100 is formed from six resin injection molded parts shown in Figures 3 and 4. The joints between these separate injection molded parts shown in Figures 3 and 4 are bonded together with an adhesive, and assembled as shown in Figures 3 and 4. In addition, as described above, the recess 112 is filled with a heat-expandable fire-resistant material 116 to complete the joint. In this embodiment, the pipe body 110 and the lower riser pipe connection part 130 are formed integrally and constitute a single component. The lateral branch pipe connection part 140 is formed from four components (water collection chamber 142, lateral branch pipe connection members 144, 146, and 148) as described above. The upper riser pipe connection part 120 is formed from a single component. The drainage pipe joint 100 is formed from these six components. Note that the water collection chamber 142 and the pipe body 110 may be molded integrally rather than separately. The pipe body 110 includes a socket 111 at its upper end, a straight pipe section 115 connected to the socket, and a tapered pipe section 113 connected to the straight pipe section 115. The tapered pipe section decreases in diameter from top to bottom. A lower riser pipe connection section 130, which serves as a socket, is formed at the lower end of the tapered pipe section of the pipe body 110. In this embodiment, stoppers 144a, 146a, 148a, and 120a are provided inside the horizontal branch pipe connection members 144, 146, 148 and the upper riser pipe connection section 120 to restrict the insertion amount when the drain horizontal branch pipe 300 and the drain riser pipe 200 are connected (146a and 148a are not shown). The stoppers 144a, 146a, and 148a restrict insertion by abutting their ends against each other when the drain horizontal branch pipe 300 and the drain riser pipe 200 are inserted.

[0033] Here, the heat-expandable refractory material 116 that fills the recess 112 will be described. The heat-expandable refractory material 116 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. In particular, since the heat-expandable refractory material 116 is filled into the outer surface of the swirling vane 114 that is struck by the drainage, it is preferable that it has a high specific gravity in order to suppress the generation of vibration and noise caused by the impact of the drainage. For this reason, it is preferable that the heat-expandable refractory material 116 contains a large amount of inorganic filler, and it is preferable that the composition of the heat-expandable refractory material 116 contains 5% by mass or more and 70% by mass of inorganic filler, more preferably 10% by mass or more and 60% by mass, and most preferably 15% by mass or more and 50% by mass.

[0034] This heat-expandable fire-resistant material 116 is formed in a 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 to approximately the outer diameter of the pipe body 110 (an amount sufficient to achieve the desired fire resistance). Therefore, the outer diameter of the pipe body 110 of the drainage pipe fitting 100 is approximately the same as that of a conventional drainage pipe fitting. Alternatively, the heat-expandable fire-resistant material 116 may be pre-shaped to match the shape of the recess 112. That is, the heat-expandable fire-resistant material 116 may be pre-formed as a molded product to match the shape of the recess 112, and this molded product (heat-expandable fire-resistant material 116) may be fitted into the recess 112. Thus, as shown in Figure 5, the thermally expandable fire-resistant material 116 is filled into the recess 112 corresponding to the swivel vane 114 (without resin, but pure), and as shown in Figure 2, when the swivel vane 114 is installed in a building, at least a portion of it is formed in a position corresponding to the range from the upper end to the lower end of the floor slab S.

[0035] In other words, at least a portion of the heat-expandable fire-resistant material 116 is interposed between the outer surface of the drainage pipe fitting 100 and the mortar M filled in the through-hole of the floor slab S, and is also filled in the recess 112 on the back surface (outer side) of the swivel vane 114 that protrudes from the inner surface of the pipe body 110. Therefore, the heat-expandable fire-resistant material 116 is provided protruding further inward (via the swivel vane 114) than the inner wall of the pipe body 110. The pipe body 110 of the drainage pipe fitting 100 is fixed in the through-hole of the floor slab S by backfilling the through-hole with mortar M or the like while it is inserted through it.

[0036] In buildings employing such a drainage piping structure, if the drainage pipe fitting 100 or the drainage riser (upper floor drainage riser 220, lower floor drainage riser 230) catches fire, the heat causes the swivel vanes 114 to expand radially inward from the drainage pipe fitting 100, crushing the swivel vanes 114 of the drainage pipe fitting 100 and blocking the pipe body 110. As a result, the drainage piping structure using this drainage pipe fitting 100 can block the pipeline in the event of a fire to prevent flames, smoke, etc. from flowing through it.

[0037] In particular, compared to conventional drainage pipe fittings, the heat-expandable refractory material 116 before combustion is positioned further inside than the inner wall of the pipe body, meaning that it begins to expand from the swirling vanes 114 that protrude further inside than the inner wall of the pipe body 110, allowing it to effectively expand inward into the pipe body. Furthermore, in this drainage pipe joint 100, a recess 112 (corresponding to the swivel vane 114) that appears on the outer surface of the pipe body 110 is filled with a heat-expandable fire-resistant material 116, which is used to form the swivel vane 114 that protrudes inward from the pipe body 110. As a result, compared to a state where the recess 112 is hollow, the vibration of the pipe body 110 when drainage hits the swivel vane 114 can be reduced, thereby reducing drainage noise.

[0038] In particular, if an outer layer member 150 such as rock wool or glass wool, which has fire resistance and vibration suppression properties, is provided on the outer layer of the heat-expandable fire-resistant material 116, the vibration suppression properties of this outer layer member 150 can further reduce drainage noise. In addition, the fire resistance properties of this outer layer member 150 can suppress the heat-expandable fire-resistant material 116 from unnecessarily expanding into the space outside the pipe body 110 in the area outside the pipe body 110 where mortar M does not exist (area A shown in Figure 2), thereby allowing the heat-expandable fire-resistant material 116 to effectively expand into the inside of the pipe body 110.

[0039] As described above, this drainage pipe fitting 100 is formed from one or more resin injection molded products, penetrates the floor slab S of a building, exhibits sufficient fire resistance, suppresses drainage noise, and prevents an increase in the outer diameter of the pipe. In particular, because the method of filling the heat-expandable fire-resistant material 116 itself is adopted, sufficient foaming properties can be achieved. Furthermore, since it is only necessary to fill the recess 112 on the outer surface of the pipe body 110 with the heat-expandable fire-resistant material 116, the manufacturing cost does not increase as in the case of a buried three-layer structure in which the heat-expandable fire-resistant material itself is embedded in the wall of the piping material, and the outer diameter of the drainage pipe fitting does not increase by wrapping the heat-expandable fire-resistant material itself around the outer layer of the drainage pipe fitting.

[0040] Next, the recess 112 in this embodiment will be described. As shown in Figure 5, the pipe body 110 has swivel vanes 114 that protrude from the inner surface of the pipe body 110. The swivel vanes 114 correspond to the recesses 112 provided on the outer surface of the pipe body 110 and are formed on the inner diameter side of the pipe body 110.

[0041] When the wastewater flowing through the pipe body 110 comes into contact with the swirling vane 114, the direction of the wastewater flow within the pipe body 110 is uniformly aligned. This prevents turbulence in the flow within the pipe body 110. As shown in Figures 3 and 4, the recess 112 is provided at an inclined angle on the outer surface of the pipe body 110. Correspondingly, the swirl vane 114 is provided at an inclined angle inside the pipe body 110. This makes it easier for vortices to be generated when wastewater flows through the pipe body 110, for example. Here, the fact that the swirl vane 114 is provided at an inclined angle inside the pipe body 110 means that the swirl vane 114 has a first surface 114a that is inclined with respect to the pipe axis of the pipe body 110. The first surface 114a is inclined with respect to the axis and faces upward. The first surface 114a is the surface that comes into contact with the swirl vane 114 as wastewater flows down from above.

[0042] Furthermore, when the swivel vanes 114 are positioned parallel to the axial direction of the pipe body 110, the drainage flowing through the pipe body 110 is aligned parallel to the axial direction of the pipe body 110. This prevents turbulence in the flow within the pipe body 110. In this case, the first surface 114a extends parallel to the axial direction.

[0043] Furthermore, when the swivel vane 114 is positioned perpendicular to the axial direction of the pipe body 110, the swivel vane 114 can be made to act like an overhang. This prevents, for example, wastewater from flowing into the portion of the pipe body 110 located below the swivel vane 114. In this case, the first surface 114a is perpendicular to the axial direction.

[0044] In Figure 5, the recess 112 is provided deeply in one location in the circumferential direction, and the recess 112 is provided using the entire back surface of the swivel vane 114. In this case, the cross-sectional area through which the drainage passes inside the pipe body 110 becomes smaller, which may reduce drainage performance. To prevent this, the recess 112 may be made shallower. As an example of this, as shown in Figure 10, the recess 112 may be provided only on a part of the back surface of the swivel vane 114. That is, even on the back surface of the swivel vane 114, the recess 112 is not provided in the dashed line area. In other words, the recess 112 may be provided on the entire back surface of the swivel vane 114, or on only a part of the back surface of the swivel vane 114. Furthermore, in such cases, to compensate for the reduced amount of heat-expandable fire-resistant material 116 that can be filled, multiple depressions 112 may be provided at intervals in the circumferential direction, as shown in Figure 10. The intervals may be equal, or they may be determined as appropriate according to the conditions of the construction site.

[0045] Next, the detailed structure of the outer layer member 150 in this embodiment will be described. As shown in Figure 2, the outer circumference of the pipe body 110, which has a heat-expandable fire-resistant material 116 in the recess 112, has an outer layer member 150. In this embodiment, the outer layer member 150 has a sound-absorbing material 151 and a sound-insulating cover 152.

[0046] The sound-absorbing material 151 is made of fibers such as glass wool, rock wool, or felt. The fiber density is 40 kg / m³. 3 The above is preferable. In addition, rock wool with particularly high fire resistance is preferably used. The sound-absorbing material 151 absorbs the sound associated with drainage generated inside the pipe body 110. This prevents the sound of drainage from leaking into the living spaces of the building 10. Furthermore, attaching the sound-absorbing material 151 to the pipe body 110 prevents the heat-expandable fire-resistant material 116 provided in the recess 112 from falling out. As shown in Figure 15, the sound-absorbing material 151 is, for example, in the form of a sheet. Therefore, when attaching the sound-absorbing material 151 to the pipe body 110, it is attached by wrapping it around the pipe body 110. Furthermore, as mentioned above, the sound-absorbing material 151 is made of fibers. In this case, it may be difficult to connect the sound-absorbing materials 151 to each other when wrapping and fixing the sound-absorbing material 151 to the pipe body 110. In this case, a decorative layer may be provided on the outside of the pipe body 110. For example, aluminum kraft paper or aluminum glass cloth is preferably used for the decorative layer. This allows adhesive tape or the like to be attached to the decorative layer. Thus, it becomes easier to connect the sound-absorbing materials 151 to each other.

[0047] The sound-insulating cover 152 is provided on the outside of the sound-absorbing material 151, as shown in Figure 2. The sound-insulating cover 152 is made of, for example, an olefin-based elastomer such as EPDM, soft PVC, or an asphalt sheet. The sound-insulating cover 152 blocks sound that could not be absorbed by the sound-absorbing material 151. This makes it more difficult for drainage sounds to leak into the living spaces of the building 10. As shown in Figure 14, the sound insulation cover 152 is, for example, in the form of a sheet. In this case, it is preferable that the sound insulation cover 152 has a cylindrical portion 152a (corresponding to the straight pipe portion 115) and a tapered portion 152b (corresponding to the tapered pipe portion 113) to match the shape of the pipe body 110. Therefore, when attaching the sound insulation cover 152 to the pipe body 110, it is attached by wrapping it around the pipe body 110. Furthermore, the sound insulation cover 152 may be pre-formed into a tubular shape to match the shape of the pipe body 110. This makes it easier to attach to the pipe body 110 compared to when it is in sheet form.

[0048] When attaching the sound-absorbing material 151 and the sound-insulating cover 152 to the pipe body 110, the sound-absorbing material 151 and the sound-insulating cover 152 may be fixed in advance with adhesive or double-sided tape. In this case, it is preferable that the sound-insulating cover 152 be in sheet form. This allows it to be attached to the pipe body 110 all at once as an outer layer member 150, thereby reducing the work time.

[0049] Furthermore, as shown in Figure 16, the sound insulation cover 152 may be divided into two parts: a cylindrical section 152a and a tapered section 152b. This allows for better adhesion with the sound-absorbing material 151.

[0050] Next, we will explain the positional relationship between the outer layer member 150 and the heat-expandable fire-resistant material 116 when attaching the outer layer member 150 to the pipe body 110. Figures 6 and 7 show the cases where the ends of the outer layer member 150 attached to the pipe body 110 are butted together, or where the ends are separated in the circumferential direction (the gap 154a between the ends in the figures is to more clearly show that the ends do not overlap radially). When attaching the outer layer member 150 to the pipe body 110, it is usually done so that there is no gap 154a between the ends of the outer layer member 150. The gap 154a between the ends of the outer layer member 150 is caused by an error or mistake when attaching the outer layer member 150 to the pipe body 110. Alternatively, it is caused when the sound-absorbing material 151 follows the deformation of the sound insulation cover 152 due to thermal shrinkage, etc., during a fire. Figures 8 and 9 show the case where the ends of the outer layer members 150 attached to the pipe body 110 are overlapped radially. In this case, a radial gap 154b is created between the pipe body 110 and the outer layer member 150 located outside the pipe body 110.

[0051] Hereinafter, the area around the ends of the outer layer member 150 attached to the pipe body 110 will be referred to as the joint 153. Here, joint 153a means the portion where the outer layer member 150 overlaps when both circumferential ends of the outer layer member 150 overlap radially. Joint 153b means the portion where both ends of the outer layer member 150 are in contact when both circumferential ends of the outer layer member 150 are abutted in the circumferential direction (the both circumferential ends of the outer layer member 150 are facing each other in the circumferential direction). The joint 153 is formed along the entire axial length of the outer layer member 150. The joint 153 is generally linear and parallel to the axial direction. However, the joint 153 may extend in a direction inclined with respect to the axis when viewed from the radially outer front view of the joint 153. Since the joint 153 is prone to spreading during combustion, it is preferable to connect the ends of the outer layer members 150 using non-combustible or flame-retardant fastening materials such as metal tapes like aluminum tape or aluminum glass cloth tape, non-combustible or flame-retardant tapes made of flame-resistant acrylic fiber or glass fiber base material, metal belts or clips, wire mesh, or staples. Alternatively, a decorative layer may be provided on the surface of the sound-absorbing material 151, and these decorative layers may be connected to each other using these fastening materials.

[0052] Figure 6 shows a state in which the joint 153b does not overlap with the recess 112 provided in the pipe body 110 in any cross section perpendicular to the axial direction of the pipe body 110. Figure 8 also shows a state in which the joint 153a does not overlap with the recess 112 provided in the pipe body 110 in any cross section perpendicular to the axial direction of the pipe body 110. Note that the aforementioned arbitrary cross section refers to any cross section extending over the entire length of a portion of the axial region of the pipe body 110. This portion of the region is the region in the pipe body 110 where the recess 112 (thermal expansionable fire-resistant material 116) is formed. The upper end of this portion of the region is the upper end of the recess 112. The lower end of this portion of the region is the lower end of the recess 112.

[0053] In other words, in Figures 6 and 8, the recess 112 is completely covered by the outer layer member 150. As a result, it is not possible to check the presence or absence of the heat-expandable fire-resistant material 116 when manufacturing the drainage pipe joint 100.

[0054] Therefore, when attaching the outer layer member 150 to the pipe body 110, it is preferable to attach it so that the joint 153 and the recess 112 overlap, as shown in Figures 7 and 9. This makes it easy to check the presence or absence of the heat-expandable fire-resistant material 116 by peeling back the outer layer member 150, even after it has been attached. As shown in Figure 9, when a joint 153a is formed by the overlapping of the circumferential ends of the outer layer member 150, the central angle around the axis, which is the size of the overlapping portion of the circumferential ends along the circumferential direction, is preferably 1° or more and 10° or less. Furthermore, if a joint 153a is formed by the overlapping of the circumferential ends of the outer layer member 150, it is preferable not only to install the joint 153a and the recess 112 so that they overlap, but also to install the joint 153a so that the edges of the ends located radially inward of the circumferential ends that form the joint 153a overlap with the recess 112. In this case, the heat-expandable fire-resistant material 116 can be easily seen by peeling back the ends located radially outward of the circumferential ends that form the joint 153a.

[0055] Furthermore, as shown in Figures 3 and 4, if the recess 112 is provided inclined in the axial direction of the pipe body 110, the joint 153 and the recess 112 may overlap at a certain point in the axial direction on the outer surface of the pipe body 110, but may not overlap at other points in the axial direction. In this case, in view of the need to easily confirm the presence or absence of the heat-expandable fire-resistant material 116, it is preferable that the recess 112 overlaps with either the upper or lower end of the joint 153. For example, it is preferable that the overlap extends within 5% of the total length of the recess 112 from the upper or lower end of the joint 153. Furthermore, within the pipe body 110, the area below the center of the first surface 114a of the swivel vane 114 is less likely to be hit by drainage and less likely to produce noise, meaning that vibrations are less likely to be transmitted to the floor slab S. In other words, the area above the center of the first surface 114a of the swivel vane 114 is more likely to be hit by drainage and more likely to produce noise, meaning that vibrations are more likely to be transmitted to the floor slab S. In addition, the area above the center of the swivel vane 114 is embedded in a through-hole in the floor slab S, which is important for fire resistance. For this reason, in order to prevent vibrations and noise from drainage from being transmitted to the floor slab S and from being transmitted into the living spaces of the building 10, it is preferable that the area near the lower end of the joint 153 and the recess 112 overlap.

[0056] Furthermore, depending on the fixing force of the outer layer member 150, a gap may form between the pipe body 110 and the heat-expandable fire-resistant material 116, which may cause the heat-expandable fire-resistant material 116 to fall off. In this case, if particularly necessary due to the conditions of the construction site, a cover member 116a may be provided on top of the heat-expandable fire-resistant material 116, as shown in Figure 13. In the illustrated example, the volume of the heat-expandable fire-resistant material 116 is smaller than the volume of the recess 112, and the cover member 116a is fitted into the opening of the recess 112. The surface of the cover member 116a is substantially flush with the outer surface of the pipe body 110. The cover member 116a is fixed, for example, to the inner surface of the recess 112 (the inner circumferential surface of the opening). In this case, although the heat-expandable fire-resistant material 116 is not directly visible due to the cover member 116a, the heat-expandable fire-resistant material 116 can be visually inspected by looking at the cover member 116a, or by measuring the weight of the drainage pipe joint 100 and the pipe body 110 after the process of installing the outer layer member 150. The lid member 116a can be made of various materials, but it is preferable that it be molded to a shape that matches the shape of the recess 112 using rigid polyvinyl chloride resin or olefin resin. Alternatively, the lid member 116a may be made of rubber such as butyl rubber, asphalt such as rubber asphalt or modified asphalt, or olefin-based elastomer such as EPDM, molded into a sheet or tube. In this case, it is provided around the entire circumference of the pipe body 110 in the circumferential direction, and in the vertical direction, it is provided within the range that includes the recess 112 where the heat-expandable fire-resistant material 116 is provided.

[0057] As described above, in the drainage pipe joint 100 according to this embodiment, the joint 153 of the sound-absorbing material 151 in the circumferential direction of the pipe body 110 is overlapped radially with respect to the recess 112. This makes it easy to check the presence or absence of the heat-expandable fire-resistant material 116 by slightly peeling back the sound-absorbing material 151.

[0058] Furthermore, the inner diameter side of the pipe body 110 has a swirling vane 114 corresponding to the recess 112. As a result, for example, the wastewater flowing inside the pipe body 110 comes into contact with the swirling vane 114. This uniformly straightens the direction of the wastewater flow inside the pipe body 110. Therefore, it prevents turbulence in the flow inside the pipe body 110 and allows for more efficient drainage.

[0059] Furthermore, the inclination angle (θ1 shown in Figure 17) of the first surface 114a of the pipe body 110, which is inclined with respect to the pipe axis, is preferably 10 degrees or more and 45 degrees or less, and more preferably 15 degrees or more and 35 degrees or less, from the viewpoint of drainage. Within this range, the drainage can be swirled to secure an air core while allowing the drainage to flow smoothly. Also, from the viewpoint of fire resistance, it is preferably 15 degrees or more and 45 degrees or less, more preferably 20 degrees or more and 45 degrees or less, and may also be 30 degrees or more and 45 degrees or less. Within this range, the area over which the thermally expandable fire-resistant material 116 entangles with the sound-absorbing material 151 is large in the event of a fire, making it difficult for the thermally expandable fire-resistant material 116 to fall off, and also making it easier to seal the penetration holes in the floor slab S. Here, θ1 is the angle between the axis of the pipe body 110 and the first surface 114a when viewing the inner circumferential surface of the pipe body 110 from the direction in which the upper end of the recess 112 and the axis of the pipe body 110 coincide, as shown in Figure 17.

[0060] Furthermore, multiple indentations 112 are provided in the circumferential direction of the pipe body 110. This allows for an increase in the amount of heat-expandable fire-resistant material 116 embedded in the indentations 112. It also allows for the provision of multiple portions of heat-expandable fire-resistant material 116 in the circumferential direction. In other words, the heat-expandable fire-resistant material 116 can be expanded more efficiently. Therefore, in the event of a fire, the space between the floor slab S and the pipe body 110 can be sealed more efficiently. Moreover, if multiple swirling vanes 114 are provided inside the pipe body 110, this can further regulate the direction of the flow.

[0061] Furthermore, a sound-insulating cover 152 is fixed to the outer circumference of the sound-absorbing material 151. This makes it easier to join the joints 153 when wrapping the sound-absorbing material 151 around the pipe body 110.

[0062] Furthermore, the composition of the heat-expandable fire-resistant material 116 contains 5% to 70% by mass of an inorganic filler. This minimizes the impact on the sound insulation properties of the pipe body 110.

[0063] Furthermore, the recess 112 has a cover member made of heat-expandable fire-resistant material 116. This prevents the heat-expandable fire-resistant material 116 from falling out of the drainage pipe joint 100 during construction.

[0064] Furthermore, the heat-expandable fire-resistant material 116 is shaped to match the shape of the recess 112. This makes it easy to attach the heat-expandable fire-resistant material 116 to the recess 112 during the manufacturing of the drainage pipe fitting 100.

[0065] Furthermore, the main pipe body 110 is connected to the drain riser pipe 200 and the drain branch pipe 300. This minimizes the number of places where the drainage system penetrates the floor slab S on each floor. As a result, the space within the building 10 can be used more effectively.

[0066] It should be noted that the technical scope of the present invention is not limited to the embodiments described above, and various modifications can be made without departing from the spirit of the invention.

[0067] For example, the pipe body 110 does not need to have a swirling vane 114 on the inner diameter side corresponding to the recess 112. This prevents the reduction in the cross-sectional area inside the pipe body 110 due to the swirling vane 114 compared to the case where the swirling vane 114 is present. Therefore, the drainage flow path can be made wider.

[0068] Furthermore, the sound-insulating cover 152 does not need to be fixed to the outer perimeter of the sound-absorbing material 151. This reduces the cost of adhesives and other materials required for fixing compared to when it is fixed.

[0069] Furthermore, the soundproofing cover 152 may clearly indicate the position of the upper end of the pipe body 110 (i.e., the upper end of the receiving port 111). This allows the drainage pipe fitting 100 to be installed in the through-hole of the floor slab S while confirming the position of the upper end of the pipe body 110 relative to the upper surface of the floor slab S.

[0070] Furthermore, the sound insulation cover 152 may clearly indicate the distance from the top surface of the floor slab S to the bottom of the opening provided on the side of the water collection chamber 142, or the distance from the top surface of the floor slab S to the bottom of the horizontal branch pipe connecting members 144, 146, and 148. This allows the drainage pipe fitting 100 to be installed in the through-hole of the floor slab S while confirming the position of the opening of the drainage pipe fitting 142 and the horizontal branch pipe connecting members 144, 146, and 148 from the top surface of the floor slab S, when the drainage pipe fitting 100's water collection chamber 142 is installed at a higher position than usual. Alternatively, instead of the distance from the top surface of the floor slab S, a marker indicating the allowable height range or limit position of the opening of the drainage pipe fitting 142 and the horizontal branch pipe connecting members 144, 146, and 148 may be used.

[0071] Furthermore, the heat-expandable fire-resistant material 116 does not need to be shaped to match the shape of the recess 112. This reduces the costs required in the process compared to when it is shaped.

[0072] Furthermore, as shown in Figure 18, an upper sound insulation cover 155 may be provided around the water collection chamber 142 and the lateral branch pipe connecting members 144, 146, and 148. Here, the upper sound insulation cover 155 is a sheet-like structure made by laminating a thin surface layer formed of soft polyvinyl chloride, high-density asphalt, or aluminum, and a thick sound-absorbing layer formed of glass wool, rock wool, felt, or soft urethane foam, and the sound-absorbing layer is wrapped around the water collection chamber 142 so as to be in contact with it. This prevents leakage of drainage noise generated in the water collection chamber 142.

[0073] Furthermore, the upper sound insulation cover 155 may be made of separate components, such as a first cover 155a for the water collection chamber 142 and a second cover 155b for the lateral branch pipe connecting members 144, 146, and 148. Alternatively, if the requirements for sound insulation are met, the first cover 155a may not be provided. This eliminates the need to prepare an upper sound insulation cover 155 with a special shape to match the shape of the water collection chamber 142, thereby reducing costs.

[0074] Furthermore, the upper sound insulation cover 155 may be partially or entirely removable from the water collection chamber 142. In addition, the first cover 155a covering the water collection chamber 142 and the second cover 155b covering the lateral branch pipe connecting members 144, 146, and 148 of the upper sound insulation cover 155 may each be individually detachable. It is preferable to make the upper sound insulation cover 155 detachable by providing fasteners, hooks, or other detachable members at its ends. In particular, it is preferable that the first cover 155a be attached to the water collection chamber 142 by connecting its ends with detachable members at a location on the side of the water collection chamber 142 where there is no opening.

[0075] Furthermore, the lower end of the upper sound insulation cover 155 may be at the same height as the upper surface of the floor slab S. In this case, the end face of the lower end of the upper sound insulation cover 155 and the end face of the upper end of the outer layer member 150 face each other. At this time, the upper sound insulation cover 155 and the outer layer member 150 may or may not be in contact. This prevents the upper sound insulation cover 155 from coming into contact with the floor slab S and the mortar M. Therefore, the work during construction can be made easier.

[0076] Furthermore, as shown in Figure 19, the lower end of the upper sound insulation cover 155 may be embedded in the through-hole of the floor slab S. This allows smoke that enters from the lower floor during a fire to remain inside the upper sound insulation cover 155. Thus, it is possible to prevent smoke from leaking to the upper floor.

[0077] Furthermore, the lower part of the upper sound insulation cover 155 may be positioned between the outer layer member 150 and the water collection chamber 142. This prevents the outer layer member 150 from floating up due to the difference in height between the receiving end 111 of the pipe body 110 and the water collection chamber 142.

[0078] Furthermore, as shown in Figure 19, the upper and lower ends of the outer layer member 150 may be fixed with tape 156. In this case, the upper end of the upper tape 156a may be embedded in the through-hole of the floor slab S, that is, positioned so as not to extend beyond the upper surface of the floor slab S. This allows smoke that enters the interior of the outer layer member 150 during a fire to remain within the upper tape 156a and mortar M. Thus, it is possible to prevent smoke from leaking to the upper floor.

[0079] Furthermore, if the distance between the drainage branch pipe 300 and the drainage pipe fitting 100 is too great, it may be impossible to achieve a proper drainage slope for the drainage branch pipe 300, resulting in inefficient drainage. In this case, lowering the position of the drainage pipe fitting 100 so that the upper end of the upper tape 156a does not exceed the upper surface of the floor slab S makes it easier to create a proper drainage slope for the drainage branch pipe 300.

[0080] Furthermore, the lower tape 156b may be fixed to the outer surface of the lower riser connection portion 130 at the bottom of the pipe body 110. This makes it more difficult for smoke to enter the interior of the outer layer member 150 in the event of a fire.

[0081] However, if the end of the sound insulation cover 152 also serves the function of the tape 156, it is not necessary to provide it. In this case, it is preferable that the upper end of the outer layer member 150 does not extend beyond the upper surface of the floor slab S.

[0082] Furthermore, as shown in Figure 20, a swirling vane (or flow deflector) 114b may be provided inside the water collection chamber 142. The swirling vane 114b is provided on the wall surface of the water collection chamber 142 where the lateral branch pipe connecting members 144, 146, and 148 are not provided. In this case, the swirling vane 114b is provided integrally with the water collection chamber 142, or on another member such as the upper pipe connecting part 120, so that it is in a predetermined position inside the water collection chamber 142. The swivel blade 114b is positioned either opposite the swivel blade 114 when viewed from above in the direction of the pipe axis, or rotated approximately 90 degrees clockwise when viewed from above. If the swivel vane 114b is positioned opposite the swivel vane 114 when viewed from above, the drainage inside the pipe body 110 that does not come into contact with the swivel vane 114 can be swirled. Furthermore, if the swivel vane 114b is positioned such that, when viewed from above, the swivel vane 114 is rotated approximately 90 degrees clockwise relative to the swivel vane 114, the wastewater hitting the swivel vane 114b will then hit the swivel vane 114, allowing for the smooth formation of an air core. This creates a vortex inside the drainpipe, allowing for more efficient drainage.

[0083] Furthermore, to align the swivel vane 114 with the lateral branch pipe connecting members 144, 146, and 148, and to align the swivel vane 114 with 114b, markings may be provided on the water collection chamber 142 and the pipe body 110. The markings may utilize the gate cutting marks from the injection molding process, and when the water collection chamber 142 and the pipe body 110 are assembled, the gate cutting marks will be aligned on a straight line in the direction of the pipe axis. This improves the efficiency of manufacturing the drainage pipe fitting 100.

[0084] Furthermore, any or all of the components of the drainage pipe fitting 100—the pipe body 110, the upper riser connection part 120, the lower riser connection part 130, and the lateral branch pipe connection part 140—may be made transparent. If made transparent, it is preferable that the drainage pipe fitting 100 be formed from a transparent resin such as rigid polyvinyl chloride resin that does not contain lead stabilizers or calcium carbonate, or ABS resin that contains methyl methacrylate.

[0085] Furthermore, any / all of the water collection chamber 142 and the branch pipe connecting members 144, 146, and 148 that constitute the branch pipe connection section 140 may be made transparent. In other words, (1) the water collection chamber 142 may be made transparent and the branch pipe connecting members 144, 146, and 148 may be made opaque, (2) the water collection chamber 142 may be made opaque and the branch pipe connecting members 144, 146, and 148 may be made transparent, or (3) both the water collection chamber 142 and the branch pipe connecting members 144, 146, and 148 may be made transparent. In addition, for cases (2) and (3), the same effect is achieved if the upper pipe connection part 120 is made transparent, as well as the horizontal branch pipe connection members 144, 146, and 148. The cases (1) to (3) are described below.

[0086] (1) First, consider the case where the water collection chamber 142 is transparent and the horizontal branch pipe connecting members 144, 146, and 148 are opaque. When the water collection chamber 142 is transparent, debris inside the water collection chamber 142 can be seen from the outside, making maintenance easy. In this case, it is preferable that the upper sound insulation cover 155 provided on the outer surface of the water collection chamber 142 be detachable.

[0087] In particular, on the side surface of the water collection chamber 142 where no opening is provided and where other openings are projected (in this embodiment, the surface facing the second horizontal branch pipe connecting member 146 shown in Figure 3), it is preferable to connect the ends of the upper sound insulation cover 155 with a detachable member. The surface where no opening is provided and where other openings are projected is not hindered in terms of transparency or visibility by the horizontal branch pipe connecting members 144, 146, 148 connected to the side surface of the water collection chamber 142, the horizontal branch pipes, or the vertical ribs provided inside.

[0088] Furthermore, if the lateral branch pipe connecting members 144, 146, and 148 are opaque, it is preferable that the drainage lateral branch pipe 300 is inserted into the transparent water collection chamber 142, with its end passing through the opaque lateral branch pipe connecting members 144, 146, and 148, as shown in Figure 20. In other words, it is preferable that the contact portion between the stoppers 144a, 146a, and 148a that restrict the insertion of the drainage lateral branch pipe 300 and the end face of the drainage lateral branch pipe 300 is located inside the transparent water collection chamber 142. This allows external confirmation of whether the drainage lateral branch pipe 300 has been securely inserted through the transparent water collection chamber 142. In this case, it is preferable to provide the stoppers 144a, 146a, and 148a on the inner surface of the water collection chamber 142 side end of the lateral branch pipe connecting members 144, 146, and 148 so that the end of the drainage lateral branch pipe 300 is inserted into the water collection chamber 142.

[0089] (2) Next, consider the case where the water collection chamber 142 is opaque and the horizontal branch pipe connecting members 144, 146, and 148 are transparent. By making the horizontal branch pipe connecting members 144, 146, and 148 transparent, it is possible to check from the outside whether the insertion amount of the drain horizontal branch pipe 300 is sufficient. By making the upper riser pipe connection part 120 transparent, it is possible to check from the outside whether the insertion amount of the upper floor drain riser pipe 220 is sufficient. In addition, when connecting the horizontal branch pipe connecting members 144, 146, and 148 to the water collection chamber 142 and the drain horizontal branch pipe 300, or the upper riser pipe connection part 120 to the water collection chamber 142 and the upper floor drain riser pipe 220 using adhesive, it is possible to check from the outside whether the adhesive has been properly applied.

[0090] Furthermore, if the water collection chamber 142 is opaque, it is preferable that the end of the horizontal drain pipe 300 or the end of the upper floor drain riser pipe 220 remain outside the opaque water collection chamber 142. In other words, it is preferable that the contact points between the stoppers 144a, 146a, 148a, and 120a that restrict the insertion of the horizontal drain pipe 300 and the upper floor drain riser pipe 220 and the end faces of the horizontal drain pipe 300 and the upper floor drain riser pipe 220 are located outside the opaque water collection chamber 142. This allows the insertion amount of the horizontal drain pipe 300 or the upper floor drain riser pipe 220 to be checked from the outside using the transparent horizontal branch pipe connecting members 144, 146, 148 or the upper riser pipe connecting part 120.

[0091] (3) Next, consider the case where the water collection chamber 142, the lateral branch pipe connecting members 144, 146, 148, and the upper riser pipe connecting part 120 are all transparent. In this case, the inside of the water collection chamber 142 can be easily seen regardless of the viewing direction or height. Furthermore, if the water collection chamber 142, the horizontal branch pipe connecting members 144, 146, 148, and the upper riser pipe connecting part 120 are all transparent, it is preferable that the ends of the drain horizontal branch pipe 300 and the upper floor drain riser pipe 220 remain outside the transparent water collection chamber 142. In other words, it is preferable that the contact points between the stoppers 144a, 146a, 148a, 120a that restrict the insertion of the drain horizontal branch pipe 300 and the upper floor drain riser pipe 220 and the end faces of the drain horizontal branch pipe 300 and the upper floor drain riser pipe 220 are located outside the transparent water collection chamber 142. This prevents the visibility inside the water collection chamber 142 from being obstructed by the opaque drain horizontal branch pipe 300 and the upper floor drain riser pipe 220, making it easier to check the inside of the water collection chamber 142 and the connections between the water collection chamber 142 and the horizontal branch pipe connecting members 144, 146, 148 and the upper riser pipe connecting part 120 from the outside.

[0092] Furthermore, without departing from the spirit of the present invention, the components in the above embodiments may be replaced with well-known components as appropriate, and the above-described modifications may be combined as appropriate. [Explanation of symbols]

[0093] 10 Buildings 100 Drainage pipe fittings 110 Main pipe (pipe body) 114 Swivel blade (protruding part) 116 Thermally expandable fireproofing materials 151 Sound-absorbing material 152 Soundproof cover 153 joints 153a Joint 153b Joint

Claims

1. The main pipe has a recess formed on its outer surface, A heat-expandable fire-resistant material is embedded in the aforementioned recess, The sound-absorbing material wrapped around the main pipe, Equipped with, The joints of the sound-absorbing material in the circumferential direction of the main pipe are overlapped radially with respect to the recess. A water collection chamber is provided at the top of the main pipe. Drainage pipe fittings.

2. At the joint of the sound-absorbing material, the circumferential ends of the sound-absorbing material are overlapped. The drainage pipe fitting according to claim 1.

3. At the joint of the sound-absorbing material, the circumferential ends of the sound-absorbing material are butted together. The drainage pipe fitting according to claim 1.

4. A projection corresponding to the aforementioned recess is provided at an inclination with respect to the axial direction of the main pipe. A drainage pipe fitting according to any one of claims 1 to 3.

5. Multiple recesses are provided in the circumferential direction of the main pipe. A drainage pipe fitting according to any one of claims 1 to 4.

6. A sound-insulating cover is fixed to the outer circumference of the sound-absorbing material that is wrapped around the main pipe. A drainage pipe fitting according to any one of claims 1 to 5.

7. The recess has a lid member made of the heat-expandable fire-resistant material. A drainage pipe fitting according to any one of claims 1 to 6.

8. The heat-expandable fire-resistant material is shaped to match the shape of the recess. A drainage pipe fitting according to any one of claims 1 to 7.

9. Rectangular pipe and Transverse branch tubes, A drainage pipe fitting according to any one of claims 1 to 8, Equipped with, The main pipe is connected to the riser pipe and the horizontal branch pipe. Drainage equipment.

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