Drain piping joint

Abstract

To provide sufficient fire resistance performance in a drain piping joint, suppress drainage noise, and suppress an increase in the outside diameter of the pipe.SOLUTION: A drain piping joint 100 comprises a pipe body 110 formed of a plurality of resin injection molded parts and placed in a through hole of a floor slab, an upper vertical pipe connection 120 that protrudes above the floor slab and connects an upper floor side drainage vertical pipe 220 that allows drainage from the upper floor to flow in, a lower vertical pipe connection 130 that protrudes below the floor slab and connects a lower floor side drainage vertical pipe 230 that allows drainage to flow down to the lower floor, and a horizontal branch pipe connection 140 that connects a drainage horizontal branch pipe above the floor slab. Between the horizontal branch pipe connection 140 and the lower vertical pipe connection 130 in the pipe body 110, formed is a swivel vane 114 that protrudes from the inner surface of the pipe body 110. A recess 112 corresponding to the swivel vane 114 is formed on the outer surface of the pipe body 110, and the recess 112 is filled with a thermally expandable refractory material 116.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a drainage pipe joint that is installed by penetrating the floor slab of a building, and in particular to a resin drainage pipe joint that is equipped with a heat-expandable fire-resistant material so that the pipe can be blocked in the event of a fire, thereby blocking the flow of flames, smoke, etc. [Background technology]

[0002] Water supply and drainage facilities are installed in apartment buildings, office buildings, etc. A representative and widely known drainage facility is a drainage piping structure that includes vertical pipes that run vertically through each floor of the building, horizontal pipes installed within each floor, and drainage piping joints that connect these. When installed in a building, such a drainage pipe joint includes a pipe body that is placed in the through hole of the floor slab, an upper riser pipe connection part that protrudes above the floor slab and connects a drainage riser pipe that allows drainage water from the upper floor to flow in, a lower riser pipe connection part that protrudes below the floor slab and connects a drainage riser pipe that allows drainage water to flow down to the lower floor, and a horizontal branch pipe connection part that connects a horizontal drainage branch pipe above the floor slab. Furthermore, many of the pipe bodies include a part (e.g., a swirl vane, a deflector plate, etc.) that changes the flow of drainage water in the drainage pipe joint. Moreover, as such a drainage pipe joint, one formed from one or more injection-molded resin products is widely known.

[0003] In a building equipped with a drainage piping structure using such a drainage piping joint, in the event of a fire or the like occurring on a floor below, in order to prevent flames, smoke, and toxic gases from flowing out to upper floors through burned or melted parts of the drainage piping structure, a heat-expandable fire-resistant material is separately provided on the outer periphery of the piping material or embedded in the wall of the piping material, so that the through-hole of the floor slab is kept blocked by the heat-expandable fire-resistant material in the event of a fire (Patent Document 1). This heat-expandable fire-resistant material is formed, for example, from a resin composition containing a resin component mainly composed of butyl rubber, a phosphorus compound, neutralized heat-expandable graphite, a water-containing inorganic substance, and a metal carbonate, or a resin composition containing an epoxy resin, a phosphorus compound, neutralized heat-expandable graphite, and an inorganic filler.

[0004] Also, rather than providing a separate heat-expandable fire-resistant material on the outer periphery of the piping material or embedding it within the wall of the piping material, a fire-resistant heat-expandable resin pipe (first joint component 10 in Patent Document 2) obtained by extrusion molding having a three-layer structure covered with a fire-resistant expansion layer formed from a fire-resistant heat-expandable resin composition containing 1 to 15 parts by weight of heat-expandable graphite per 100 parts by weight of polyvinyl chloride resin, and a coating layer formed from a polyvinyl chloride resin composition not containing a heat-expandable fire-resistant material that covers the inner and outer surfaces of the fire-resistant expansion layer, has been provided in a portion of the body of a drainage piping joint corresponding to a floor slab (Patent Document 2).

[0005] Both the drainage pipe joints disclosed in Patent Document 1 and the drainage pipe joints disclosed in Patent Document 2 have fire-resistant thermal expansion properties, so that in the event of a fire, the thermally expandable graphite, etc., which exhibits this fire-resistant thermal expansion property, thermally expands to block the drainage pipe joints and through holes in the slab, allowing the floor slab to maintain its function as a fire compartment wall. [Prior art documents] [Patent documents]

[0006] [Patent Document 1] Patent No. 5859042 [Patent Document 2] Patent No. 5508048 Summary of the Invention [Problem to be solved by the invention]

[0007] The drainage pipe joint disclosed in the above-mentioned Patent Document 1 has good fire resistance, but when wrapping a heat-expandable fire-resistant material around the outer layer of the drainage pipe joint, the outer diameter of the drainage pipe joint becomes large, and a through hole of a correspondingly larger diameter must be provided in the floor slab. When embedding the heat-expandable fire-resistant material in the wall of the pipe material, the heat-expandable fire-resistant material must be placed in a mold and then the inner and outer layers must be injection molded to encase it, forming an embedded three-layer structure, which complicates the manufacturing process and increases manufacturing costs.

[0008] On the other hand, the drainage piping joint disclosed in Patent Document 2 requires the separate molding of a fire-resistant thermally expandable resin pipe, which increases the manufacturing process and raises manufacturing costs. In addition, the joint contains only 1 to 15 parts by weight of thermally expandable graphite per 100 parts by weight of polyvinyl chloride resin, so the total amount of thermally expandable graphite is not large to begin with. Since the thermally expandable graphite is merely contained in the resin in such a ratio, it becomes more difficult to block penetrations in floor slabs and the like than when the thermally expandable graphite itself is provided separately around the outer periphery of the piping material (as in Patent Document 1).

[0009] Furthermore, from a different perspective than fire resistance, both the drain pipe joint disclosed in Patent Document 1 and the drain pipe joint disclosed in Patent Document 2 have a part (such as a swirl vane, a deflector plate, etc.) in the pipe body that changes the flow of drainage water in the drain pipe joint, and the drainage water hits this part to change the flow (swirling flow, deflection flow). Naturally, when the drainage water hits this part, the drain pipe joint body vibrates, which may generate drainage noise. For this reason, it is necessary to devise a way to effectively reduce such vibrations.

[0010] The present invention was developed in consideration of the above-mentioned problems, and its object is to provide a drainage pipe joint that is formed by penetrating the floor slab of a building using one or more resin injection-molded products, and that can fully demonstrate fire resistance, suppress drainage noise, and suppress an increase in the outer diameter of the pipe. [Means for solving the problem]

[0011] In order to achieve the above object, the drainage pipe joint according to the present invention employs the following technical measures. In other words, the drainage piping joint of the present invention is formed of one or more resin injection-molded products, and when installed in a building, comprises a pipe body that is placed in a through hole of a floor slab, an upper riser pipe connection portion that protrudes above the floor slab and connects a drainage riser pipe that allows drainage water to flow in from the upper floor, a lower riser pipe connection portion that protrudes below the floor slab and connects a drainage riser pipe that allows drainage water to flow down to the lower floor, and a horizontal branch pipe connection portion that connects a drainage horizontal branch pipe above the floor slab, and is characterized in that a protrusion that protrudes from the inner surface of the pipe body is formed between the horizontal branch pipe connection portion and the lower riser pipe connection portion in the pipe body, a recess corresponding to the protrusion is formed on the outer surface of the pipe body, and the recess portion is filled with a heat-expandable fire-resistant material.

[0012] Preferably, the recess can be configured so that, when constructed in a building, at least a portion of the recess is formed at a position corresponding to at least a portion of the range from the upper end to the lower end of the floor slab. More preferably, the protrusion can be configured to be a portion that changes the flow of drainage water within the drainage pipe joint.

[0013] More preferably, the protrusions may be configured as swirl vanes. More preferably, the recess may be formed in all or part of the rear surface of the swirl vane. More preferably, the outer layer of the thermally expandable fire-resistant material may be provided with a member having fire resistance and vibration suppression properties.

[0014] More preferably, the member has a three-layer structure, and is configured so that, from the outer surface of the pipe body, a vibration-damping material, a vibration insulator formed of fire-resistant inorganic fiber, and a sound-proof cover are provided in this order on the outer surface of the pipe body. More preferably, the vibration-damping material can be configured to be attached to the outer surface of the pipe body so as to cover the thermally expandable fire-resistant material filled in the recessed portion.

[0015] More preferably, a heat-expandable fire-resistant sheet may be attached to the outer surface of the pipe body in place of the vibration-damping material at a position above the recessed portion. More preferably, the innermost layer in the three-layer structure is either the vibration-damping material or the heat-expandable fire-resistant sheet, and the pipe diameter with the innermost layer provided is configured to be equal to or smaller than the outer diameter of the upper opening in the pipe body and the receiving hole into which the horizontal branch pipe connection portion is inserted.

[0016] More preferably, the thermally expandable fire-resistant material and the thermally expandable fire-resistant sheet can be configured to have different thermal expansion coefficients. More preferably, the vibration-damping material is formed to include a butyl-based or asphalt-based material, and the sound-insulating cover is formed to include a rubber-based, elastomer-based or olefin-based material. Effect of the Invention

[0017] According to the present invention, it is possible to provide a drainage pipe joint that is formed by penetrating the floor slab of a building using one or more resin injection-molded products, and that can fully demonstrate fire resistance, suppress drainage noise, and suppress an increase in the pipe outer diameter. [Brief description of the drawings]

[0018] [Figure 1] 1A and 1B are diagrams showing a drainage piping structure in which a drainage pipe joint 100 according to the present invention is adopted, in which (A) is an oblique view showing a state in which the drainage pipe joint 100 has an outer layer member 150, and (B) is an oblique view showing a state in which the drainage pipe joint 100 does not have an outer layer member 150. [Diagram 2] 1A and 1B are perspective views showing a drainage pipe joint 100 according to the present invention, in which (A) is a perspective view showing a state in which the joint is filled with a thermally expandable fire-resistant material 116, and (B) is a perspective view showing a state in which the joint is not filled with a thermally expandable fire-resistant material 116. [Diagram 3] FIG. 3A is an exploded view of the drainage pipe joint 100 shown in FIG. 2B, and FIG. 3B is a perspective view of the pipe body 110 seen through the pipe wall. [Figure 4] 1 is a cross-sectional view showing a drainage piping structure in which a drainage pipe joint 100 according to the present invention is adopted. [Diagram 5] 4 is a cross-sectional view showing another example of a drainage piping structure in which the drainage pipe joint 100 according to the present invention is adopted. FIG. [Figure 6] 1 is a diagram showing a modified example of the drainage pipe joint 100 according to the present invention. [Figure 7] 2 is a diagram for explaining a recess in the drainage pipe joint 100 according to the present invention. FIG. [Figure 8] 1 is a half sectional view showing a drainage piping structure in which another drainage pipe joint 500 according to the present invention is adopted. [Figure 9] FIG. 9 is a partially enlarged cross-sectional view of FIG. 8 (without the recessed cross-section). [Figure 10] FIG. 9 is a partially enlarged cross-sectional view of FIG. 8 (including a recessed cross-section). [Figure 11] 9A is a development view of rock wool, which is an example of a vibration insulator 720 (formed from fire-resistant inorganic fibers) that forms the three-layered outer layer member 700 shown in FIG. 8, and FIG. 9B is a comparative example. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0019] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A drainage pipe joint 100 according to an embodiment of the present invention will be described in detail below with reference to the drawings. As shown in Figures 1(A) and 4(A), the drainage piping structure using this drainage pipe joint 100 has a non-fire-resistant resin drainage pipe joint 100 provided in a through hole that vertically penetrates a floor slab S in a building, and a resin drainage standpipe (upper floor drainage standpipe 220 that allows drainage water to flow in from the upper floor and lower floor drainage standpipe 230 that allows drainage water to flow down to the lower floor) connected to this drainage pipe joint 100. Here, "non-fire-resistant" refers to a property that can be deformed, melted, or burned by heat caused by a fire that occurs in a building, and this applies to resin-made ones, for example.

[0020] The drainage pipe joint 100 and the drainage riser (upper floor drainage riser 220 and lower floor drainage riser 230) are made of, for example, polyvinyl chloride, polyethylene, polybutene, polypropylene, nylon, etc. For the drainage riser, for example, a so-called two-layer fireproof pipe may be used. As shown in Fig. 3(A), this drainage pipe joint 100 is formed of one or more (six in this example) resin injection moldings. As shown in Fig. 1(A) and Fig. 4(A), this drainage pipe joint 100 includes a pipe body 110 that is placed in the through hole of the floor slab S when installed in a building, an upper riser pipe connection part 120 that connects an upper floor side drainage riser pipe 220 that protrudes above the floor slab S and allows drainage water from the upper floor to flow in, a lower riser pipe connection part 130 that protrudes below the floor slab S and connects a lower floor side drainage riser pipe 230 that flows down to the lower floor, and a horizontal branch pipe connection part 140 that connects a horizontal drainage branch pipe (not shown) above the floor slab S. A characteristic feature is that, as shown in Figures 3(A) and 3(B), between the horizontal branch pipe connection portion 140 and the down rise pipe connection portion 130 in the pipe body 110, a swirling vane 114 is formed as a protrusion that protrudes from the inner surface of the pipe body 110, and on the outer surface of the pipe body 110, a recess 112 corresponding to this protrusion (here, the swirling vane 114) is formed, and this recess 112 is filled with a thermally expandable fire-resistant material 116.

[0021] As shown in Figure 4(A), at least a portion of the recess 112 of this protrusion (swirl vane 114) is formed at a position corresponding to at least a portion of the range from the upper end to the lower end of the floor slab S when constructed in a building. Here, this protrusion is not limited to swirl vanes 114 as long as it is a part that changes the flow of drainage within the drainage pipe fitting 100, but may be a deflector plate or the like, and is not limited to swirl vanes or deflector plates as long as a corresponding recess 112 is formed on the outer surface of the pipe body 110.

[0022] Furthermore, it is also preferable that an outer layer member 150 having fire resistance and vibration suppression properties is provided on the outer layer of the thermally expandable fireproof material 116 so as to be wound around the outer periphery of the pipe body 110. An example of this outer layer member 150 is rock wool or glass wool. The drainage pipe joint 100 having these features will now be described in more detail. In addition to the above-mentioned configuration, as shown in Fig. 3(A), the side branch pipe connecting part 140 of this drainage piping joint 100 is composed of a water collection chamber 142 with three openings at 90° intervals in a plan view, and a first side branch pipe connecting member 144 for connecting a drainage side branch pipe corresponding to the positions of the openings, a second side branch pipe connecting member 146, and a third side branch pipe connecting member 148. Here, although not limited thereto, the first side branch pipe connecting member 148 connects a drainage side branch pipe without reducing its diameter, whereas the second side branch pipe connecting member 144 and the third side branch pipe connecting member 146 connect a drainage side branch pipe with a reduced diameter.

[0023] In addition, the drain pipe joint 100 is formed of six resin injection-molded products as shown in FIG. 3(A) as described above, and the injection-molded products shown in FIG. 3(A) are mutually connected. The joints are bonded with adhesive or the like, assembled as shown in Fig. 2(B), and then, as described above, the recess 112 is filled with the thermally expandable fireproof material 116 to complete the assembly. The water collecting chamber 142 and the pipe body 110 may be molded integrally with each other instead of being separate bodies.

[0024] Here, the thermally expandable fireproof material 116 filled in the recess 112 will be described. The thermally expandable fireproof material 116 is formed from, for example, a resin composition containing a resin component mainly composed of butyl rubber, a phosphorus compound, neutralized thermally expandable graphite, a water-containing inorganic substance, and a metal carbonate, or a resin composition containing an epoxy resin, a phosphorus compound, neutralized thermally expandable graphite, and an inorganic filler. For example, a product name "Fiblock" manufactured by Sekisui Chemical Co., Ltd. (expands 5 to 40 times at a reaction temperature of 200°C) is used as the thermally expandable fireproof material 116. In addition, a product name "thermally expandable heat-resistant sealant IP" manufactured by Inaba Denki Sangyo Co., Ltd. (expands starting at 120°C, expands to 4 times or more in volume) and a 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 thermally expandable fireproof material 116.

[0025] The thermally expandable fireproof material 116 is not limited to the above, and various other materials can be used. In this way, a wide variety of thermally expandable fire-resistant materials 116 with different reaction temperatures and expansion rates can be used, and therefore the most suitable one can be selected to meet the various conditions such as reaction temperature and pipe diameter required for the installation location within the building.

[0026] This thermally expandable fireproof material 116 is formed in a putty-like form, and is filled into the depression 112 on the outer surface of the pipe body 110 of the drainage pipe joint 100 so as to fill the depression 112 up to about 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 joint 100 is about the same as that of a conventional drainage pipe joint. In this manner, as shown in FIG. 1(B), the thermally expandable fire-resistant material 116 itself (not resin-containing but pure) is filled into the portion of the recess 112 corresponding to the protrusion (swirl vane 114), and as shown in FIG. 4(A), at least a portion of this protrusion (swirl vane 114) is formed at a position corresponding to the range from the top to the bottom of the floor slab S when installed in a building.

[0027] That is, at least a part of the thermally expandable fireproof material 116 is interposed between the outer peripheral surface of the drainage pipe joint 100 and the mortar M filled in the through hole of the floor slab S, and further, the thermally expandable fireproof material 116 is filled in the recess 112 on the back surface (outer surface side) of the protruding portion (swirl vane 114) protruding from the inner surface of the pipe body 110. Therefore, the thermally expandable fireproof material 116 is provided protruding further inward (through the swirl vane 114) than the inner wall of the pipe body 110. The pipe body 110 of the drainage pipe joint 100 is inserted into the through hole of the floor slab S and fixed to the through hole by backfilling the through hole with mortar M or the like.

[0028] In a building employing such a drainage piping structure, if the drainage piping joint 100 or the drainage standpipe (upper floor drainage standpipe 220, lower floor drainage standpipe 230) burns, the heat will cause the drainage piping joint 100 to expand radially inward from the protruding part (swirl vane 114), crushing the protruding part (swirl vane 114) of the drainage piping joint 100 and blocking the pipe body 110. As a result, a drainage piping structure using this drainage piping joint 100 is able to shut off the pipe to prevent the flow of flames, smoke, etc. in the event of a fire.

[0029] In particular, compared to conventional drainage pipe fittings, the thermally expandable fire-resistant material 116 before combustion is provided further inward than the inner wall of the pipe body, i.e., it begins to expand from the protruding portion (swirl vane 114) that protrudes further inward than the inner wall of the pipe body 110, and therefore can effectively expand inward into the pipe body. In addition, in this drainage pipe joint 100, a recess 112 (corresponding to the protrusion (swirl vane 114)) that appears on the outer surface of the pipe body 110 and that is used to form a protrusion (swirl vane 114) that protrudes inward from the pipe body 110 is filled with a thermally expandable fireproof material 116. Therefore, compared to when the recess 112 is hollow, it is possible to reduce the vibration of the pipe body 110 when wastewater hits the protrusion (swirl vane 114), thereby reducing drainage noise.

[0030] In particular, when an outer layer member 150 such as rock wool or glass wool having fire resistance and vibration suppression properties is provided on the outer layer of the heat-expandable fireproof material 116, the drainage noise can be further reduced due to the vibration suppression properties of this outer layer member 150. In addition, due to the fire resistance properties of this outer layer member 150, in the region where the heat-expandable fireproof material 116 is outside the pipe body 110 and where no mortar M exists (region A shown in FIG. 4(A)), the heat-expandable fireproof material 116 can be suppressed from unnecessarily expanding into the space outside the pipe body 110, so that the heat-expandable fireproof material 116 can be effectively expanded into the inside of the pipe body 110.

[0031] As described above, the drain pipe joint 100 is formed of one or more resin injection molded products, is provided penetrating the floor slab S of a building, and can fully exert fire resistance, suppress drain noise, and suppress an increase in the pipe outer diameter. In particular, since the thermally expandable fireproof material 116 itself is filled, rather than containing 1 to 15 parts by weight of thermally expandable graphite per 100 parts by weight of polyvinyl chloride resin, sufficient foaming properties can be exhibited, and since it is only necessary to fill the recess 112 on the outer surface of the pipe main body 110 with the thermally expandable fireproof material 116, there is no increase in manufacturing costs as with an embedded three-layer structure in which the thermally expandable fireproof material itself is embedded in the wall of the pipe material, and the outer diameter of the drain pipe joint is not increased by wrapping the thermally expandable fireproof material itself around the outer layer of the drain pipe joint. <Three variations in drainage piping structure> Below, three modified examples of the drainage piping structure using the drainage pipe joint 100 according to the present embodiment will be described. Since all three modified examples are the same in that they use the drainage pipe joint 100 described above, the description of the drainage pipe joint 100 will not be repeated here.

[0032] 4(B), in the first modified example, when constructing a drainage piping structure using the above-mentioned drainage pipe joint 100, a retaining member 300 having a substantially annular hole is provided for preventing leakage of mortar M to the lower floor when the through-hole is backfilled with mortar M or the like with the pipe body 110 of the drainage pipe joint 100 inserted into the through-hole of the floor slab S. This retaining member 300 is fixed with an anchor bolt B and a nut N provided on the lower floor side of the floor slab S before the through-hole is backfilled with mortar M or the like (it may also be fixed with adhesive tape or the like). For this reason, as shown in Figure 4 (B), even if the pipe body 110 is reduced in diameter in the area of ​​the through hole, and even if the pipe body 110 has a depression 112 provided on its outer surface (unlike conventional drainage piping joints) (the pipe body 110 is buried up to about the outer diameter of the pipe body 110 by the heat-expandable fire-resistant material 116, making it unlikely that mortar M will leak to the lower floor in the first place), leakage of mortar M to the lower floor can be effectively prevented when the through hole is backfilled with mortar M or the like.

[0033] As shown in FIG. 4(C), the second modified example includes a retaining member 400 extending from the inner circumference of the substantially annular shape into a substantially L-shaped cross section in order to hold the outer layer member 150, in addition to preventing the mortar M from leaking to the lower floor as in the first modified example. This retaining member 400, like the retaining member 300, is fixed with an anchor bolt B and a nut N, etc., provided on the lower floor side of the floor slab S before the through-hole is backfilled with mortar M, etc. As a result, as shown in FIG. 4(C), in addition to being able to suitably prevent the mortar M from leaking to the lower floor when the through-hole is backfilled with mortar M, etc., the outer layer member 150 can be held by the floor slab S via the retaining member 400, so that the outer layer member 150 will not fall off in the event of a fire, and the fire resistance of the outer layer member 150 can be reliably expressed. Note that, The method for fixing the outer layer member 150 to the holding member 400 is not particularly limited and will not be described.

[0034] The third modified example is a so-called floating piping, in which the pipe core of the horizontal drainage branch pipe is, for example, 140 mm above the upper end of the slab S. In such a case, if the thermally expandable fireproof material 116 is above the slab S, there is a possibility that the fire resistance performance may not be exhibited or / and the fire resistance performance may be reduced. In addition, it is not preferable because the fire on the lower floor is stopped by the upper floor. Therefore, the drainage piping structure according to the third modified example is structured so that the lower end of the part filled with the thermally expandable fireproof material 116 does not come above a position 140 mm below the pipe core of the horizontal drainage branch pipe (upper surface of the slab S) when, for example, a plastic pipe (outer diameter 89 mm) with a nominal diameter of 75 is connected to the horizontal branch pipe connection part, as shown in FIG. 5. It goes without saying that it is preferable that most of the part filled with the thermally expandable fireproof material 116 is located below the upper surface of the slab S.

[0035] In general, the thickness of the slab S corresponding to the drainage pipe joint 100 according to this embodiment is often 100 mm or more. Therefore, the upper end of the portion filled with the thermally expandable fireproof material 116 is located above a position 100 mm below the lower end of the horizontal branch pipe connection part 140. Incidentally, the outer layer member 150 above the horizontal branch pipe connecting portion 140 is intended mainly for sound insulation and heat insulation, and gets in the way when the through-hole is backfilled with mortar M or the like, so it is also preferable to set it after backfilling with mortar M. Therefore, in this case, the outer layer member 150 will only be located below the horizontal branch pipe connecting portion 140 when backfilling with mortar M.

[0036] Here, there is a portion where the heat-expandable fire-resistant material 116 is filled in the tapered portion of the lower pipe section in the pipe body 110 of the drainage pipe fitting 100, and the presence of the outer layer member 150 further prevents the filled heat-expandable fire-resistant material 116 from falling. Furthermore, since the outer surface after filling the recess 112 with the heat-expandable fire-resistant material 116 is approximately the same as the outer surface of the pipe body 110 of the drainage pipe fitting 100, the cross-sectional shape of the outer periphery becomes circular, which effectively prevents leakage to the floor below when mortar M is filled.

[0037] <Modifications for drainage pipe joints> A modified example of the drain pipe joint 100 according to the present embodiment will be described below with reference to Fig. 6. The drain pipe joint 100 according to this modified example differs from the above description only in that the portion where the thermally expandable fire-resistant material 116 is provided is not limited to the recess 112, and the other portions are the same, so detailed description here will not be repeated. 6, for example, the portion (part of the drain pipe joint 100) where the thermally expandable fire-resistant material 116 is provided (set) may be the outside of the pipe body 110 of the drain pipe joint 100, in addition to the portion of the recess 112. Here, by providing the thermally expandable fire-resistant material 117 on the outside of the recess 112 and in a portion having a smaller diameter than the body, such as a tapered portion, the thermally expandable fire-resistant material 117 is prevented from becoming larger than the outer diameter D(1) of the pipe body 110.

[0038] <Modifications regarding the recess> As described above, the outer surface of the pipe body 110 of the drain pipe joint 100 according to this embodiment has a recess 112 corresponding to the swirl vane 114, which is an example of a protrusion, and the recess 112 is filled with a thermally expandable fireproof material 116. Below, a modified example of a recess different from the recess 112 described above will be described with reference to Fig. 7. Fig. 7(A) is a top view of the pipe body 110 of the drain pipe joint 100 described above, Figs. 7(B) and 7(C) are horizontal cross-sectional views of the center of the height range of the tapered portion, and Figs. 7(C) and 7(D) are horizontal cross-sectional views for explaining a recess (modified example) different from the recess shown in Fig. 7(B).

[0039] FIG. 7(B) shows the above embodiment described in FIG. 1 to FIG. 3, in which the recess 112 is deep, and the recess 112 is provided on the entire back side of the swirl vane 114, that is, the entire part of the horizontal cross section that is not visible from the top in FIG. 7(A). In this case, the cross-sectional area through which the wastewater passes is reduced, and the drainage performance may be reduced. To prevent this, the recess 112 may be provided shallowly. That is, as shown in FIG. 7(C), the recess 112 is provided only on a part of the back side (part that is not visible from the top) of the swirl vane 114. As shown in FIG. 7(D), in FIG. 7(C), compared to FIG. 7(B), the recess is not provided in the dashed line part even on the back side of the swirl vane 114. That is, the recess 112 may be provided on the entire back side of the swirl vane 114, or may be provided on a part of the back side of the swirl vane 114. In such a case, in order to cope with the reduced amount of heat-expandable fire-resistant material 116 that can be filled, it is also preferable to provide (set) heat-expandable fire-resistant material 116 on the outside of the pipe body 110 of the drainage pipe joint 100 in addition to the recess 112, as shown in FIG. 6.

[0040] <Another embodiment of the drainage piping structure> Hereinafter, a drainage pipe joint 500 according to another embodiment of the present invention and a drainage pipe structure using this drainage pipe joint 500 will be described in detail with reference to Figs. 8 to 11. The drainage pipe structure using this drainage pipe joint 500 is provided in a through hole that vertically penetrates a floor slab S in a building, similar to the drainage pipe structure using the drainage pipe joint 100 described above. Hereinafter, in the drainage pipe joint 500 and the drainage pipe structure using this drainage pipe joint 500 described below, the same structures as the drainage pipe joint 100 and the drainage pipe structure using this drainage pipe joint 100 are given the same reference numerals as in the above-mentioned embodiment. The explanations of these may overlap with the above-mentioned explanations and may not be repeated hereinafter.

[0041] With reference to Figure 8, which is a half-sectional view showing a drainage piping structure in which this drainage pipe fitting 500 is adopted, Figure 9, which is a partially enlarged cross-sectional view of Figure 8 (without a cross-section of the recess 512 portion), and Figure 10, which is a partially enlarged cross-sectional view of Figure 8 (with a cross-section of the recess 512 portion), the drainage pipe fitting 500 and a drainage piping structure using this drainage pipe fitting 500 will be described. The drain pipe joint 500 and the drain riser (upper floor drain riser 220 and lower floor drain riser 230) are molded from, for example, polyvinyl chloride, polyethylene, polybutene, polypropylene, nylon, or the like.

[0042] As shown in these figures, the drainage pipe joint 500 is formed of a plurality of resin injection moldings. As shown in these figures, the drainage pipe joint 500 includes a pipe body 510 that is placed in the through hole of the floor slab S when installed in a building, an upper riser pipe connection part 520 that connects the upper floor side drainage riser pipe 220 that protrudes above the floor slab S and allows drainage water from the upper floor to flow in, a lower riser pipe connection part 530 that protrudes below the floor slab S and connects the lower floor side drainage riser pipe 230 that flows down to the lower floor, and a horizontal branch pipe connection part 540 that connects the drainage horizontal branch pipe 210 above the floor slab S. As shown in these figures, the side branch pipe connecting section 540 is composed of a water collection chamber 542 with three openings spaced 90° apart in a plan view, and a first side branch pipe connecting member 544, a second side branch pipe connecting member 546, and a third side branch pipe connecting member 548 for connecting the drainage side branch pipe corresponding to the positions of the openings. Here, although not limited thereto, the first side branch pipe connecting member 544, the second side branch pipe connecting member 546, and the third side branch pipe connecting member 548 connect the drainage side branch pipe 210 without reducing their diameters.

[0043] A characteristic feature is that a swirl vane 514 is formed as a protrusion on the inner surface of the pipe body 510 between the horizontal branch pipe connection part 540 and the downstream pipe connection part 530 in the pipe body 510, and a recess 512 corresponding to this protrusion (here, the swirl vane 514) is formed on the outer surface of the pipe body 510. The recess 512 is filled with a thermally expandable fire-resistant material 612. The thermally expandable fire-resistant material 612 corresponds to the above-mentioned thermally expandable fire-resistant material 116. Here, as the thermally expandable fire-resistant material 612, a non-hardening, non-drying putty-like material is preferably used.

[0044] Here, this protrusion is not limited to swirl vanes 514 as long as it is a part that changes the flow of drainage within the drainage pipe fitting 500, but may be a deflector plate or the like, and is not limited to swirl vanes or deflector plates as long as a corresponding recess 512 is formed on the outer surface of the pipe main body 510. Furthermore, an outer layer member 700 having a three-layer structure and having fire resistance and vibration suppression properties is provided on the outer layer of the thermally expandable fire-resistant material 612 so as to be wrapped around the outer periphery of the pipe main body 510 .

[0045] As shown in these figures, this outer layer member 700 has a three-layer structure, and is provided on the outer surface of the pipe body 510 in the following order from the outer surface of the pipe body 510: vibration damping material 714, vibration insulator 720 made of fire-resistant inorganic fiber, and sound insulation cover 730. Recess 512 is filled with heat-expandable fire-resistant material 612, which provides fire resistance (fire spread prevention function), and also provides vibration damping and sound insulation performance by filling recess 512, which is a hollow portion, with putty-like heat-expandable fire-resistant material 612.

[0046] This vibration-damping material 714 is attached to the outer surface of the pipe body 510 (over the entire surface, for example, with an adhesive or pressure-sensitive adhesive) so as to cover the heat-expandable fire-resistant material 612 filled in the recess 512. Regarding fire resistance, a heat-expandable fire-resistant sheet 712 is attached to the outer surface of the pipe body 510 in place of the vibration-damping material 714 at a position above the recess 512. The heat-expandable fire-resistant sheet 712 attached to the outer surface of the pipe body 510 in this manner also exhibits vibration-damping performance similar to that of the vibration-damping material 714 (although the performance may not be equivalent).

[0047] In particular, the thermal expansion coefficients of the thermally expandable fireproof material 612 and the thermally expandable fireproof sheet 712 are different. Here, it is generally considered that a thermally expandable fireproof material with a high thermal expansion coefficient has low shape retention after expansion, and a thermally expandable fireproof material with a low thermal expansion coefficient has high shape retention after expansion. If the thermal expansion coefficient is low, there is a possibility that sufficient fire resistance cannot be exhibited, and if the shape retention is low, there is a possibility that the thermally expandable material will fall. Taking into consideration this trade-off characteristic and the thermal expansion coefficients (and the absolute value of the difference, etc.), the thermally expandable materials contained in the thermally expandable fireproof material 612 and the thermally expandable fireproof sheet 712 are selected in accordance with the respective positions, weights, shapes, reaction speeds, and expansion start temperatures, etc.

[0048] Furthermore, the innermost layer 710 in this three-layer structure is either a thermally expandable fire-resistant sheet 712 or a vibration-damping material 714, and the pipe diameter D(3) (part of the thermally expandable fire-resistant sheet 712) and pipe diameter D(4) (part of the vibration-damping material 714) where the innermost layer 710 is provided are equal to or smaller than the outer diameter D(2) of the upper opening of the pipe body 510, into which the horizontal branch pipe connecting portion 540 (more specifically, the water collection chamber 542) is inserted. This makes it possible to prevent the pipe outer diameter of the drainage pipe joint 500 from becoming large.

[0049] The vibration-damping material 714 is formed containing a butyl-based (butyl rubber, etc.) or asphalt-based (rubber asphalt, modified asphalt, etc.) material, the sound-proofing cover 730 is formed containing a rubber-based (EPDM (ethylene propylene diene rubber) etc.), elastomer-based or olefin-based (polyethylene resin, etc.) material, and the vibration insulator 720 formed from fire-resistant inorganic fibers consists of an aggregate (porous material) of fire-resistant inorganic fibers.

[0050] Here, examples of inorganic fibers include artificial mineral fibers, such as glass wool, rock wool, and ceramic fibers, which are preferable because they have high vibration insulation performance and high sound absorption performance. The vibrations generated when the material hits the floor 14 are suppressed by the vibration-damping material 714, and then the vibrations are blocked by the vibration insulator 720 made of rock wool or the like (and / or the noise caused by the vibrations is absorbed), and the transmission of the noise caused by the vibrations is blocked by the sound-proofing cover 730 made of a rubber cover made of EPDM or the like. Here, rock wool is a general term for materials made from natural rocks or steel slag such as blast furnace slag as the main raw material, and is also fire-resistant and flame-resistant.

[0051] In the following, a case may be described in which butyl rubber is used as the vibration damping material 714, rock wool is used as the vibration insulator 720, and an EPDM rubber cover is used as the soundproof cover 730, but these materials are merely examples. When this rock wool is used as the vibration insulator 720, it is preferable to use a sheet-shaped rock wool manufactured by papermaking. However, it is difficult to process the rock wool sheet manufactured by papermaking in this way into the three-dimensional shape of the pipe body 510 (straight pipe section + tapered section) by sewing or the like, and even if a planar rock wool sheet (hereinafter may be simply referred to as rock wool, but in this case, the vibration insulator 720 in the present invention is preferably in the form of a sheet) without sewing or the like is set on the pipe body 510 by, for example, attaching it with tape, it may fall off in the event of a fire. For this reason, the developed shape (planar shape) of the rock wool sheet is made as shown in, for example, FIG. 11(A).

[0052] In this way, even if the slab is thin, the slits can be made to appear only in one place in the vertical direction (up and down direction in the pipe body 510). Furthermore, in the development of the rock wool sheet shown in FIG. 11(B), the slits are made to appear only in one place in the vertical direction, but in order to accommodate the three-dimensional shape of the pipe body 510 (straight pipe section + reduced diameter section (tapered section)), the slits (here, five places) are made at the slab position in the rock wool sheet in FIG. 11(A), whereas the rectangle and the partial ring shape are joined by an arc in FIG. 11(B). Since the slits in the development shown in FIG. 11(A) are at the slab position, even if there are slits in this part (this part may be mechanically weak or have poor fire resistance), the slab does not burn, so there is no problem with the fire resistance of the rock wool and it will not fall off in the event of a fire. In contrast, in the unfolded view of the rock wool sheet shown in Figure 11(B), even if the joint shown by the dotted line is not at the slab position, and even if it is at the slab position, there is a possibility that the joint will break and the rock wool sheet will fall in the event of a fire, due to the short length of the joint and the heavy weight of the partial ring joined below.

[0053] Furthermore, the vibration insulator 720 using this rock wool is provided so as to be fixed loosely and at several points in the circumferential direction, rather than being fixed all around, in order to suppress noise propagation due to resonance with the vibration-damping material 714 or the thermally expandable fire-resistant sheet 712 on the inner layer side. In particular, the height positions of the several fixing positions in the circumferential direction where the rock wool is fixed (more specifically, where the rock wool is fixed to the EPDM rubber cover as the sound insulation cover 730) are higher than the thermal expansion material (thermally expandable fire-resistant material 612 and thermally expandable fire-resistant sheet 712), preventing the rock wool from falling in the event of a fire. Also, examples of the attachment method for preventing the rock wool from falling include bonding with an adhesive, double-sided tape, etc.

[0054] In the following, a method for manufacturing the drainage pipe joint 500 provided with the outer layer member 700 having a three-layer structure, that is, a procedure for attaching the outer layer member 700, will be described. First, the putty-like heat-expandable fire-resistant material 612 is filled into the recess 512. Then, the heat-expandable fire-resistant sheet 712 is attached. In this embodiment, the heat-expandable fire-resistant sheet 712 is separated from the putty-like heat-expandable fire-resistant material 612, but the entirety or entirety of the putty-like heat-expandable fire-resistant material 612 may be covered with the heat-expandable fire-resistant sheet 712. In addition, the vibration-damping material 714 is attached to the outer circumferential surface of the pipe body 510 with an adhesive or a pressure sensitive adhesive. In this case, the innermost layer 710 in this three-layer structure is either the thermally expandable fireproof sheet 712 or the vibration-damping material 714.

[0055] A rock wool sheet (developed view is shown in FIG. 11(A)) is wound as vibration insulator 720 from above the thermally expandable fireproof sheet 712 and vibration-damping material 714. Further, from above, it is covered with an EPDM rubber cover as sound insulation cover 730. Here, this EPDM rubber cover as sound insulation cover 730 exhibits water stoppage, sound insulation, and vibration insulation. The EPDM rubber cover as sound insulation cover 730 may be integrally molded and bonded to drainage pipe joint 500 to exhibit water stoppage, or may not be bonded and exhibit water stoppage only by tension (expressed by elasticity of rubber). In this case, as shown in the cross-sectional shapes shown in FIGS. 8 to 10, it is also preferable to provide an upper end 732 that is annular and thick at the upper end of this EPDM rubber cover as sound insulation cover 730 and a lower end 734 that is annular and thick at the lower end in the same way (although the diameter is different) to enhance water stoppage.

[0056] As described above, this drainage pipe fitting 500 is formed from one or more resin injection-molded products and is installed by penetrating the floor slab S of a building, thereby fully demonstrating its fire-resistant performance and suppressing drainage noise. In particular, in the three-layer outer layer member 700, the innermost layer 710 is made of vibration-damping material 714, for example, butyl rubber, which is provided in close contact with the outer surface of the pipe body 510 to extremely effectively suppress vibration, the middle layer is made of vibration insulator 720, for example, a rock wool sheet, which is provided loosely and fixed in several places to provide sound absorption, fire resistance, sound insulation, and vibration insulation, and the outermost layer is made of sound insulation cover 730, for example, an EPDM rubber cover, to provide water stopping, sound insulation, and vibration insulation. Vibrations generated when wastewater flowing down the pipe body 510 hits, for example, the swirl vanes 514 are suppressed by the vibration-damping material 714, and the vibration is further blocked by the vibration insulator 720, and further the sound insulation cover 730 blocks the generation of noise associated with the vibration, thereby extremely effectively suppressing drainage noise. In addition, two heat-expandable fire-resistant materials (heat-expandable fire-resistant material 612 and heat-expandable fire-resistant sheet 712) are provided, and the outside of them is covered with multiple layers including a layer that exhibits fire resistance, so that the fire resistance can be fully exerted.

[0057] It should be noted that the embodiments disclosed herein are illustrative and not restrictive in all respects. The scope of the present invention is defined by the claims, not the above description, and is intended to include all modifications within the meaning and scope of the claims. [Industrial Applicability]

[0058] The present invention is suitable for drainage piping joints that are installed by penetrating the floor slab of a building, and is particularly suitable in that it allows the pipe to be blocked in the event of a fire, thereby fully exerting fire resistance, suppressing drainage noise, and suppressing an increase in the outer diameter of the pipe. [Explanation of symbols]

[0059] 100, 500 Drainage pipe joint 110, 510 Tube body 112, 512 recess 114, 514 Swirling blades 116, 612 Thermally expandable refractory materials 120, 520 Upper riser connection 130, 530 Downstream pipe connection 140, 540 Side branch pipe connection 142, 542 Water collection chamber 144, 146, 148 Side branch pipe connecting member 544, 546, 548 Side branch pipe connection member 150, 700 Outer layer material 220 Upper floor drainage standpipe 230 Lower floor drainage standpipe 300, 400 Retaining member 710 Innermost layer 712 Thermally expandable fireproof sheet 714 Damping material 720 Vibration insulator (made of fire-resistant inorganic fibers) 730 Soundproof Cover

Claims

1. It is formed from one or more resin injection molded products, When installed in a building, the pipe comprises a pipe body that is placed in a through hole of a floor slab, an upper riser pipe connection part that protrudes above the floor slab and connects a drainage riser pipe that allows drainage water from an upper floor to flow in, a lower riser pipe connection part that protrudes below the floor slab and connects a drainage riser pipe that allows drainage water to flow down to a lower floor, and a horizontal branch pipe connection part that connects a horizontal drainage branch pipe above the floor slab, A protrusion is formed between the horizontal branch pipe connection portion and the downstand pipe connection portion in the pipe body, the protrusion protruding from an inner surface of the pipe body, A recess corresponding to the protrusion is formed on the outer surface of the tube body, The recessed portion is filled with a thermally expandable fireproof material. A drainage piping joint characterized by:

2. The drainage pipe joint according to claim 1 , wherein at least a portion of the recess is formed at a position corresponding to at least a portion of the range from the upper end to the lower end of the floor slab when the joint is installed in a building.

3. 3. The drainage pipe joint according to claim 1, wherein the protrusion is a portion that changes the flow of drainage water within the drainage pipe joint.

4. The drainage pipe joint according to any one of claims 1 to 3, wherein the protrusion is a swirl vane.

5. 5. The drainage pipe joint according to claim 4, wherein the recess is formed in all or part of the rear surface of the swirl vane.

6. A drainage pipe joint according to any one of claims 1 to 5, characterized in that an outer layer of the thermally expandable fire-resistant material is provided with a member having fire resistance and vibration suppression properties.

7. The drainage pipe joint according to claim 6, characterized in that the member has a three-layer structure, and is provided on the outer surface of the pipe body in the following order from the outer surface of the pipe body: a vibration-damping material, a vibration insulator formed of fire-resistant inorganic fiber, and a sound-proof cover.

8. 8. The drainage pipe joint according to claim 7, wherein the vibration-damping material is attached to the outer surface of the pipe body so as to cover the heat-expandable fire-resistant material filled in the recessed portion.

9. 9. A drainage pipe joint as described in claim 8, characterized in that a heat-expandable fire-resistant sheet is attached to the outer surface of the pipe body at a position above the recessed portion, instead of the vibration-damping material.

10. The innermost layer in the three-layer structure is either the vibration-damping material or the thermally expandable fire-resistant sheet, 10. A drainage pipe joint as described in claim 9, characterized in that the pipe diameter where the innermost layer is provided is equal to or smaller than the outer diameter of a socket at the upper opening of the pipe body and into which the horizontal branch pipe connection portion is inserted.

11. 11. The drainage pipe joint according to claim 9 or 10, wherein the thermally expandable fire-resistant material and the thermally expandable fire-resistant sheet have different thermal expansion coefficients.

12. The vibration-damping material is formed by including a butyl-based or asphalt-based material, and the sound-insulating cover The drainage pipe joint according to any one of claims 7 to 11, characterized in that the joint is formed containing a rubber-based, elastomer-based or olefin-based material.

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