Joint

Abstract

To provide a sound insulation structure and a construction method of a collective joint.SOLUTION: A joint is installed in an open hole provided in a floor slab of a building. The joint comprises: an assembly part having a vertical pipe connection part connected to a vertical pipe extending from an upper floor and a horizontal pipe connection part connected to a horizontal pipe; an upper cylindrical part that connects the vertical pipe connection part and the assembly part and has an inner diameter larger than an inner diameter of the vertical pipe; and a lower connection part connected to a vertical pipe extending from a lower floor. A cylindrical part is inserted in the lower connection part. A swirl vane integrated with a swirling inner edge part is integrated in an inclined state with an inner peripheral surface of the cylindrical part. A reinforcement wall for the swirl vane, which serves also as a peripheral wall of the cylindrical part, is provided at an area where the swirling inner edge part does not exist in an inner peripheral direction of the cylindrical part in plan view of the cylindrical part.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a joint. [Background technology]

[0002] BACKGROUND ART A resin drainage pipe joint such as that described in Patent Document 1 below has been known. This drain pipe joint is installed on each floor, penetrating the floor slab separating the upper and lower floors of a building, and connects the drain pipe on the upper floor with the drain pipe on the lower floor in a watertight manner. This drain pipe joint has an upper body made of resin and equipped with a socket to which the drain pipe of the upper floor is connected, an upper end connection part that is embedded in the floor slab and connected to the lower end of the upper body, and a lower body that protrudes downward from the ceiling surface of the floor slab and equipped with a lower end connection part to which the drain pipe of the lower floor is connected.The above-mentioned drain pipe joint also has a resin interior member that can be fixed inside the lower body and is equipped with vanes that guide the drainage water flowing down. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent Publication No. 2021-194543 Summary of the Invention [Problem to be solved by the invention]

[0004] The above-mentioned drainage pipe joints are used in high-rise buildings, etc., but when draining water from high-rise buildings, the wastewater collects and the amount of water increases, so in structures with internal blades, the blades are prone to vibrate, creating the problem that the blades become a source of noise when draining water.

[0005] In particular, the water distribution pipe fitting described in Patent Document 1 has a structure in which the blade members are suspended separately from the body portion, making the blade members prone to vibration and highly likely to become a source of noise.

[0006] In view of the above circumstances, the present invention has an object to provide a coupling having a structure that is less likely to generate noise associated with drainage, even when the coupling has a structure in which blades are provided inside. [Means for solving the problem]

[0007] In order to solve the above problems, the present invention proposes the following aspects. "1" The joint of this form is a joint that is installed in a through hole provided in the floor slab of a building, and is equipped with a vertical pipe connection portion that is connected to a vertical pipe extending from an upper floor, a collecting portion that has a horizontal pipe connection portion that is connected to a horizontal pipe, an upper tubular portion that connects the vertical pipe connection portion and the collecting portion and has an inner diameter larger than the inner diameter of the vertical pipe, and a lower connecting portion that is connected to a vertical pipe extending from a lower floor, and is characterized in that a tubular portion is inserted inside the lower connecting portion, and swirl vanes that have a swirl-type inner edge portion integrated into the inner surface of the tubular portion are integrated in an inclined state, and a reinforcing wall for the swirl vanes that also serves as the peripheral wall of the tubular portion is provided in the area where the swirl-type inner edge portion does not exist in the inner circumferential direction of the tubular portion when viewed in a plane.

[0008] Because the cylindrical portion is inserted inside the lower connecting pipe, the cylindrical portion can be stably supported inside the lower connecting pipe. Also, because the cylindrical portion has swirl vanes integrated with the cylindrical portion by a swirl-type inner edge portion inside the cylindrical portion, the swirl vanes can be firmly integrated inside the cylindrical portion compared to a structure in which the swirl vanes are suspended in the joint separately from the body portion. Furthermore, because a reinforcing wall is provided in the area of ​​the cylindrical portion in the circumferential direction where the inner edge portion of the swirl vanes is not provided, this reinforcing wall reinforces the swirl vanes. These features work together to strengthen the support structure for the swirl vanes, making it possible to provide a joint that is less likely to generate noise caused by the swirl vanes when wastewater flows through the inside of the joint.

[0009] "2" In the joint of this embodiment, a tapered cylindrical portion having a tapered tip is formed on the lower end side of the lower connection portion, a tapered pipe portion having a tapered tip is formed on the lower end side of the cylindrical portion, and the tapered pipe portion is inserted so as to fit along the inner surface of the tapered cylindrical portion.

[0010] When the tapered tube portion is disposed inside the tapered tube portion of the lower connecting pipe, the tapered tube portion is disposed along the inner surface of the tapered tube portion, so that the tube portion can be stably disposed inside the lower connecting pipe. Since the tube portion can be stably disposed, the swirl vanes integrated with the tube portion can also be stably disposed.

[0011] "3" In the joint according to this embodiment, the tubular portion may have a straight pipe portion formed on the upper side and a tapered pipe portion formed on the lower side, the swirl vane is a swirl vane that extends from the inner surface of the straight pipe portion along the inner surface of the tapered pipe portion while being inclined, and the swirl vane has a swirl-type inner edge portion that extends from the inner surface of the straight pipe portion along the inner surface of the tapered pipe portion while being inclined, and a configuration can be adopted.

[0012] The swirl vanes are firmly integrated with the cylindrical section because they are integrated with the inner surfaces of the straight pipe section and the tapered pipe section at the swirl-type inner edge. This makes it difficult for the swirl vanes to become a noise source even if wastewater flows through.

[0013] "4" In the joint of this embodiment, a configuration can be adopted in which a notch adjacent to the swirl vane is provided on the peripheral wall of the cylindrical portion on the side of the swirl vane, from one end side of the swirl vane located on the tip side of the tapered pipe portion to the other end side of the swirl vane located on the straight pipe portion side.

[0014] A notch adjacent to the swirl vane can be provided in a part of the peripheral wall of the cylindrical part. By providing the notch, when the cylindrical part having the swirl vane is integrally molded by resin molding using a mold, it becomes possible to remove the mold, which is advantageous for mass production.

[0015] "5" In the joint according to this embodiment, a configuration can be adopted in which the upper part of the cylindrical part is a spigot that is inserted into the lower part of the assembly part.

[0016] By forming the upper part of the cylindrical portion into a spigot, the cylindrical portion can be integrated with the joint by inserting this spigot into the assembly part of the joint.

[0017] [6] In the joint according to this embodiment, a configuration can be adopted in which the upper part of the cylindrical part is a socket into which the lower part of the assembly part is inserted.

[0018] By forming a socket at the top of the cylindrical portion, the assembly portion of the joint can be inserted into this socket to integrate the cylindrical portion with the joint. [Effects of the Invention]

[0019] According to the joint of this embodiment, the cylindrical portion is inserted into the lower connecting pipe, so that the cylindrical portion can be stably supported inside the lower connecting pipe. Furthermore, since the cylindrical portion has swirl vanes integrated with the cylindrical portion by a swirl-type inner edge portion inside the cylindrical portion, the swirl vanes can be firmly integrated inside the cylindrical portion compared to a structure in which the swirl vanes are suspended separately from the body portion inside the joint. Furthermore, since a reinforcing wall is provided in the region of the cylindrical portion in the circumferential direction where the inner edge portion of the swirl vanes is not provided, this reinforcing wall reinforces the swirl vanes. These features work together to strengthen the support structure for the swirl vanes, making it possible to provide a joint that is less likely to generate noise caused by the swirl vanes when wastewater flows through the inside of the joint. [Brief explanation of the drawings]

[0020] [Figure 1] 1 is a cross-sectional view showing a structure in which a joint according to a first embodiment of the present invention is installed in a floor slab. [Figure 2] 4 is a perspective view showing a state in which a tubular part applied to the joint is viewed from a first direction. FIG. [Figure 3] FIG. 4 is a perspective view of the cylindrical portion as viewed from a second direction. [Figure 4] FIG. 2 is a perspective view of the cylindrical portion as viewed from below. [Figure 5] FIG. 10 is a perspective view of the cylindrical portion as viewed from a third direction. [Figure 6] FIG. 10 is a perspective view showing a comparative example of a cylindrical portion. [Figure 7] FIG. 10 is a side view showing a structure in which a socket is provided at the assembly where the cylindrical portions are joined, and a spigot is provided at the top of the cylindrical portions. [Figure 8]FIG. 10 is a side view showing a structure in which a socket is formed at the upper end of the cylindrical portion and a spigot is provided at the assembly portion where the cylindrical portions are joined. [Figure 9] FIG. 10 is a partial cross-sectional view showing a structure in which a fire-resistant material is arranged between a cylindrical portion and a tapered cylindrical portion on the outside thereof. [Figure 10] FIG. 10 is a perspective view showing a tubular portion that is applied to a joint according to a second embodiment of the present invention. [Figure 11] FIG. 4 is a perspective view of the cylindrical portion as viewed from a second direction. [Figure 12] FIG. 10 is a perspective view of the cylindrical portion as viewed from a third direction. [Figure 13] FIG. 10 is a perspective view showing a tubular portion that is applied to a joint according to a third embodiment of the present invention. [Figure 14] FIG. 4 is a perspective view of the cylindrical portion as viewed from a second direction. [Figure 15] FIG. 10 is a perspective view of the cylindrical portion as viewed from a third direction. [Figure 16] FIG. 10 is a perspective view showing a tubular portion that is applied to a joint according to a fourth embodiment of the present invention. [Figure 17] 11 is a graph showing the results of a comparison by vibration analysis of a joint provided with a tubular portion shown in FIG. 2, a joint provided with a tubular portion shown in FIG. 6, and a joint provided with a tubular portion shown in FIG. 10. DETAILED DESCRIPTION OF THE INVENTION

[0021] (First embodiment) A joint according to a first embodiment of the present invention will be described below with reference to FIGS. The joint 1 according to this embodiment is a drainage pipe joint that is applied to a drainage facility 2 in an apartment building or other collective housing unit, an office building, or the like. As shown in Figure 1, the drainage equipment 2 has joints 1 installed on each floor, vertically penetrating the floor slab S that separates the upper and lower floors of a building such as an apartment building or a building. Also provided are vertical drainage pipes 5 made of resin that connect the joints 1 on each floor, and horizontal pipes (horizontal drainage branch pipes) 6 made of resin that are piped on the floor of each floor and connected to the joints 1 on each floor. The drainage equipment 2 is constructed by stacking the drainage vertical pipe 5 on the lower floor into the upper receiving port of the joint on the lower floor, inserting the lower end of the joint 1 on the upper floor into the upper spigot of the drainage vertical pipe 5 to connect it, and then connecting the lower end of the drainage vertical pipe 5 extending to the upper floor to the upper spigot of the joint 1.

[0022] The joint 1 comprises a collecting section 12 having a cylindrical vertical pipe connection section 10 connected to a vertical drainage pipe 5 extending to an upper floor, and a cylindrical horizontal pipe connection section 11 connected to a horizontal pipe 6. The joint 1 also comprises an upper cylindrical section 13 that connects the vertical pipe connection section 10 and the collecting section 12 and has an inner diameter larger than the inner diameter of the vertical drainage pipe 5, and a lower connecting section 15 that is connected to the vertical drainage pipe 5 extending to a lower floor. In joint 1, at least one of upper tubular portion 13, collecting portion 12, and lower connecting portion 15 is made of a molded resin body. A first swirl vane (first swirl member) 16 is provided inside upper tubular portion 13, and a second swirl vane (second swirl member) 17 and a third swirl vane (third swirl member) 18 are provided inside lower connecting portion 15.

[0023] The joint 1 of this embodiment is attached to a portion where a through-hole 19 that passes through a floor slab S in the vertical direction is formed, for example, as shown in FIG. The upper tubular portion 13 is the portion to which the lower end spigot of the vertical drainage pipe 5 extending from the upper floor is connected via an upper receiving member 20. The upper receiving member 20 has a cylindrical peripheral wall portion 21, with an outer flange portion 22 formed on the outer periphery of this peripheral wall portion 21 and an inner flange portion 23 formed on the inner periphery of the lower end of the peripheral wall portion 21. The upper receiving member 20 is fitted to the upper tubular portion 13 by inserting the lower side of the peripheral wall portion 21 into the receiving port 13A at the upper end of the upper tubular portion 13. A sealing member 25 made of an elastic material such as rubber is housed inside the upper receiving member 20.

[0024] The seal member 25 has a cylindrical wall portion 26, an inner flange-type vertical pipe receiving portion 27 formed on the inner periphery of the bottom of the cylindrical wall portion 26, and a seal body portion 28 formed on the inner periphery of the upper part of the cylindrical wall portion 26. The seal member 25 is housed inside the upper receiving member 20 with the vertical pipe receiving portion 27 in contact with the inner flange portion 23 of the upper receiving member 20. The lower end of the vertical drainage pipe 5 on the upper floor side is inserted into the part inside the upper receiving member 20 where the seal member 25 is provided, and the vertical drainage pipe 5 is supported by the vertical pipe receiving part 27. In addition, a ring-cap type cover member 29 is provided on top of the cylindrical wall part 26, and the upper surface side of the seal main body part 28 through which the vertical drainage pipe 5 is inserted is covered with the cover member 29.

[0025] The upper tubular portion 13 has a spigot 13B formed at its lower end with a reduced diameter, and this spigot 13B is inserted into the socket 12A at the upper end of the collecting portion 12 and fitted to the top of the collecting portion 12. As shown in Figure 1, one or more horizontal pipe connection sections 11 are formed on the side of the collecting section 12, into which horizontal pipes 6 are inserted and connected. The horizontal pipe connection section 11 has a cylindrical section 11a and an inner flange section 11b formed on the base end side of the cylindrical section 11a. The horizontal pipe 6 is inserted into the horizontal pipe connection section 11 via a cylindrical horizontal pipe joint member (bush) 11A, and a ring-shaped plate-shaped cover member 11D is attached to the section where the horizontal pipe 6 passes through the horizontal pipe joint member 11A. The horizontal pipe 6 inserted into the horizontal pipe connection section 11 is fixed to the horizontal pipe connection section 11 by a fixing means such as adhesive. In the installed state shown in Figure 1, the horizontal pipe connection section 11 is positioned directly above the floor slab S.

[0026] A vertical rib 12b is formed on the inner periphery of the collecting section 12 at a position adjacent to the part where the horizontal pipe 6 is connected. This vertical rib 12b is a member that prevents wastewater that has flowed into the collecting section 12 from a specific horizontal pipe 6 from flowing back into other horizontal pipes. The collecting portion 12 is cylindrical and has the same inner diameter from its top end to its bottom end. The top end of the lower connecting portion 15 is fitted into a socket 12B at the bottom end of the collecting portion 12.

[0027] The lower connecting portion 15 is a member that constitutes the lower portion of the joint 1, and is formed with a large diameter cylindrical portion 15a, a tapered cylindrical portion 15b, and a small diameter cylindrical portion 15c that are coaxially formed from top to bottom. The inner diameter of the large-diameter cylindrical portion 15a is set to be approximately equal to the inner diameter of the receiving port 12B of the assembly portion 12. The axial length of the large-diameter cylindrical portion 15a is set to be slightly smaller than the axial length of the assembly portion 12. In FIG. 1, the axial length of the large-diameter cylindrical portion 15a is formed to be approximately half the thickness of the floor slab S.

[0028] The tapered cylindrical portion 15b is a portion of the tube that is gradually narrowed so that the diameter becomes smaller at the bottom without changing the wall thickness dimension, and its axial length is longer than that of the large diameter cylindrical portion 15a, and it is positioned so as to protrude a predetermined length below the floor slab S. As shown in Figure 1, the small-diameter cylindrical portion 15c is the portion into which the upper end of the vertical drainage pipe 5 of the lower floor is inserted and connected, and is configured to protrude downward by a certain distance from the ceiling surface of the floor slab S. A stopper portion 15d, which abuts against the upper end surface of the upper end insertion port of the vertical drainage pipe 5 of the lower floor, is formed inside the small-diameter cylindrical portion 15c on an extension line of the tapered tube portion 15b. As shown in Figure 1, a recessed portion 15f is formed around the stopper portion 15d to prevent an increase in the wall thickness of the stopper portion 15d and its vicinity.

[0029] The first swirl vane 16 is supported by a support piece 16a extending downward from the lower end of the peripheral wall portion 21 of the upper receiving member 20, and is formed so as to be located inside the center portion in the height direction of the upper tubular portion 13. The first swirl vane 16 has a curved plate 16b with a tapered shape, and the curved plate 16b is arranged with its concave portion facing upward so as to face below the vertical drainage pipe 5. The first swirl vane 16 is provided to receive a portion of the wastewater flowing down from the vertical drainage pipe 5 and swirl it along the curved plate 16b, thereby generating a swirling flow.

[0030] The second swirl vane 17 and the third swirl vane 18 are integrated in an inclined state with the cylindrical portion 24 so as to protrude in a fin-like manner from the inner surface of the cylindrical portion 24 inserted into the lower connecting portion 15 . The second swirl vane 17 is made up of an arc-shaped blade plate 17a formed to extend obliquely up and down inside the cylindrical portion 24. The third swirl vane 18 is made up of an arc-shaped blade plate 18a like the second swirl vane 17, and is formed to extend obliquely up and down inside the lower connecting portion 15. The second swirl vane 17 and the third swirl vane 18 are formed around the lower connecting portion 15 at 180° intervals. Each of the swirl vanes 16, 17, and 18 generates a swirling flow in a part of the wastewater, rectifying the wastewater and contributing to improving the drainage performance.

[0031] The configurations of the cylindrical portion 24 and the second swirl vanes 17 and 8 will be described in detail below with reference to FIGS. Since Figure 1 shows a cross section of the joint 1, the overall shapes of the second swirl vanes 17 and the second swirl vanes 8 are not depicted, but Figures 2 to 5 show the cylindrical portion 24 from various directions to make the overall shapes of the second swirl vanes 17 and the second swirl vanes 8 easier to understand. The cylindrical portion 24 is composed of a straight pipe portion 24a with a uniform inner diameter located on the upper side and a tapered pipe portion 24b located on the lower side that tapers downward. The straight pipe portion 24a is inserted tightly into the large-diameter cylindrical portion 15a, and the tapered pipe portion 24b is inserted tightly into the tapered pipe portion 15b. The axial length of the straight pipe portion 24a is formed to be equal to the axial length of the large-diameter cylindrical portion 15a, and the axial length of the tapered pipe portion 24b is formed to be shorter than the axial length of the tapered pipe portion 15b. Note that in Figures 2 to 5, the length of the straight pipe portion 24a is drawn longer than the length of the straight pipe portion 24a shown in Figure 1 to make the drawings easier to see.

[0032] The second swirl vane 17 is made of an arc-shaped blade plate 17a that extends from the straight pipe portion 24a to the bottom side of the tapered pipe portion 24b. The blade plate 17a is integrated with the inner surface of the straight pipe portion 24a and the inner surface of the tapered pipe portion 24b at its arc-shaped inner edge portion 17b. In other words, the blade plate 17a is integrated with the inner peripheral surface of the straight pipe portion 24a and the inner peripheral surface of the tapered pipe portion 24b, and is formed so as to protrude inward from these inner peripheral surfaces. The outer edge portion 17c of the blade plate 17a is formed linearly so as to reach from the straight pipe portion 24a to the bottom side of the tapered pipe portion 24b.

[0033] The third swirl vane 18 is composed of an arc-shaped vane plate 18a that is smaller than the second swirl vane 17. The vane plate 18a is arranged to occupy a size from a position in the straight pipe section 24a near the junction with the tapered pipe section 24b to a position in the tapered pipe section 24b near the straight pipe section 24a. The arc-shaped inner edge portion 18b of the vane plate 18a is integrated with the inner surface of the straight pipe section 24a and the inner surface of the tapered pipe section 24b, and the vane plate 18 is formed to protrude inward from these inner surfaces. The outer edge portion 18c of the vane plate 18a is formed linearly so as to reach from the bottom side of the straight pipe section 24a to the upper side of the tapered pipe section 24b.

[0034] The inner edge 18b of the third swirl vane 18 is shorter than the inner edge 17b of the second swirl vane 17, and the outer edge 18c of the third swirl vane 18 is shorter than the outer edge 17c of the second swirl vane 17. The inclination angle of the third swirl vane 18 is smaller than the inclination angle of the second swirl vane 17. In this embodiment, the second swirl vane 17 and the third swirl vane 18 are different sizes, but they may be the same size, or one may be omitted. There are no particular restrictions on the inclination direction and angle of the second swirl vane 17 and the third swirl vane 18, as long as they are inclined to generate a swirling flow inside the cylindrical portion 24.

[0035] The straight pipe section 24a and the tapered pipe section 24b are provided with the second swirl vane 17 integrated at the inner edge 17b and the third swirl vane 18 integrated at the inner edge 18b. When viewed from above, the straight pipe section 24a and the tapered pipe section 24b have peripheral walls even in the circumferential portions where the second swirl vane 17 and the third swirl vane 18 are not provided. That is, the straight pipe section 24a and the tapered pipe section 24b have peripheral walls not only in the regions where the second swirl vane 17 and the third swirl vane 18 are provided but also in the regions where the second swirl vane 17 and the third swirl vane 18 are not provided. In the straight pipe section 24a, a portion of the peripheral wall existing in an area where the second swirl vane 17 and the third swirl vane 18 are not provided functions as a reinforcing wall 24d for the second swirl vane 17 and the third swirl vane 18. In the tapered pipe section 24b, a portion of the peripheral wall existing in an area where the second swirl vane 17 and the third swirl vane 18 are not provided functions as a reinforcing wall 24e for the second swirl vane 17 and the third swirl vane 18. The reinforcing walls 24d and 24e for the swirl vanes are provided in the circumferential direction of the cylindrical section 24 in an area where the second swirl vane 17 and the third swirl vane 18 are not provided so as to also serve as the peripheral wall of the cylindrical section 24.

[0036] In the joint 1, a first sound-insulating cover 30 is provided to cover the outer periphery of the upper tubular portion 13 and the outer periphery of the peripheral wall portion 21 above it, and a second sound-insulating cover 31 is provided to cover the outer periphery of the lower part of the upper tubular portion 13 and the outer periphery of the collecting portion 12. In the configuration shown in FIG. 1 , the lower end of the first sound-insulating cover 30 is arranged as an overlapping portion 30a to cover the upper end of the second sound-insulating cover 31, and a waterproof tape 33 is wrapped around the overlapping portion 30a covering the upper end of the second sound-insulating cover 31 to cover this overlapping portion. The second sound-insulating cover 31 is arranged to cover the outer periphery of the cylindrical portion 11a of the horizontal pipe connecting portion 11 where the cylindrical portion 11a is provided. The second sound-insulating cover 31 is formed up to a position covering the upper end of the lower connecting portion 15. The upper end of the first sound-insulating cover 30 is formed up to the upper end of the tubular wall portion 26 of the upper receiving member 20 or the peripheral portion of the cover member 29, and the upper end of the first sound-insulating cover 30 is protected by a waterproof tape 33 wrapped around it.

[0037] The first sound-insulating cover 30 and the second sound-insulating cover 31 each have a two-layer structure, for example, consisting of an inner layer made of an inner layer material such as soft urethane foam and an outer layer made of an exterior material such as a butyl rubber sheet with a synthetic resin adhesive. The inner layer may also have a two-layer structure combining a fire-resistant material such as fiber-mixed mortar and an outer layer made of a sound-insulating sheet. The outer layer made of a sound-insulating sheet does not necessarily have to be provided. The waterproof tape 33 is made of a butyl rubber sheet with a polyolefin film or the like, and can be attached to the area where it is used, making the area waterproof.

[0038] A thermal expansion material 35 made of a graphite-based thermal expansion material or the like is attached to the outer periphery of the large-diameter cylindrical portion 15a of the lower connecting portion 15. As an example, the thermal expansion material 35 is made of thermally expandable graphite or the like with a thermal expansion start temperature set to 240°C or higher, and expands in the event of a fire to block the through-hole 19 in the floor slab S.

[0039] A third sound-insulating cover 36 is provided on the lower connecting portion 15, covering the area from the portion where the thermal expansion material is attached at the upper end to the small-diameter cylindrical portion 15c. As an example, the third sound-insulating cover 36 can be configured to have an inner layer such as a fiber-mixed mortar layer and an outer layer such as a sound-insulating sheet, but the outer layer made of a sound-insulating sheet need not be provided, and the third sound-insulating cover 36 may have a structure similar to that of the first sound-insulating cover 30 and the second sound-insulating cover 31 described above. As an example, a two-layer structure can be used, consisting of an inner layer made of an inner layer material such as soft urethane foam and an outer layer made of an exterior material such as a butyl rubber sheet with a synthetic resin adhesive.

[0040] The joint 1 covered with the first to third sound-insulating covers 30, 31, 36 passes through the through-hole 19 of the floor slab S and is attached to the floor slab S so that the thermal expansion material 35 is disposed inside the through-hole 19. More specifically, the joint 1 is fixed to the floor slab S with a filler 37 such as mortar that is filled in the through-hole 19 so as to fill the through-hole 19 around the joint 1, with the large-diameter cylindrical portion 15a positioned on the upper inner side of the through-hole 19.

[0041] (Function and effect of joint 1) As shown in Figure 1, joint 1 attached to floor slab S connects the upper floor drainage vertical pipe 5 with the lower floor drainage vertical pipe 5, and drainage water from each floor flows into collection section 12 via horizontal pipe 6. Upper floor drainage water flows from the upper floor drainage vertical pipe 5 into collection section 12 via upper tubular section 13 of joint 1. Because first swirl vanes 16 are installed inside upper tubular section 13, a portion of the drainage water is converted into a swirling flow, straightened, and directed downward. For example, if the first swirl vanes 16 guide the drainage water downward while swirling, the reflected flow of the drainage water can be prevented from flowing back toward the horizontal pipe. Therefore, joint 1 has excellent drainage performance.

[0042] In the joint 1, the upper tubular portion 13 is cylindrical and has the same inner diameter as the collecting portion 12, and the wastewater flowing in from the vertical drain pipe 5 on the upper floor side reaches the internal space of the upper tubular portion 13, which has a larger inner diameter than the vertical drain pipe 5. The upper tubular portion 13 has a larger diameter than the vertical drain pipe 5 and the internal space volume of the upper tubular portion 13 is sufficiently large, so providing the upper tubular portion 13 ensures sufficient volume for the wastewater introduction portion of the joint 1, and therefore the joint 1 has high drainage performance. For example, even if a large amount of wastewater flows into the upper tubular portion 13 from the vertical drain pipe 5, the interior of the upper tubular portion 13 is unlikely to become negative pressure, so drainage is not hindered and the drainage is excellent.

[0043] No reduced diameter section is formed at the bottom of the collecting section 12, allowing wastewater to flow up to the lower connection section 15 while maintaining the same inner diameter. If a reduced diameter section were formed at the bottom of the collecting section 12, the wastewater from the horizontal pipes 6 and the wastewater from the vertical drainage pipes 5 would mix in the collecting section 12, increasing the amount of wastewater and making the collecting section 12 prone to becoming a region that could become full. For this reason, depending on the full-water state, an abnormal negative pressure region or positive pressure region could be created at the bottom of the collecting section 12, which could cause problems with drainage. Therefore, by making the bottom of the collecting section 12 a region with a larger internal volume while maintaining the same inner diameter, drainage can be improved compared to a configuration with a reduced diameter section. The upper side of the joint 1 has a divided structure consisting of two parts, the collection part 12 and the upper tubular part 13, and is therefore made from a molded resin body. There are few shape restrictions when molding each part, making it easy to manufacture.

[0044] 1, the straight pipe section 24a is fitted inside the large-diameter cylindrical section 15a, and the tapered pipe section 24b is fitted inside the tapered pipe section 15b to join the tubular section 24, so that the tubular section 24 is stably supported inside the joint 1. Furthermore, the inner edge 17b of the second swirl vane 17 is integrated with the straight pipe section 24a and the tapered pipe section 24b, so that the second swirl vane 17 is firmly attached to the tubular section 24. Therefore, even if wastewater flows inside the joint 1 and the second swirl vane 17 converts the wastewater into a swirling flow, there is little risk of the second swirl vane 17 vibrating, and there is also little risk of noise due to vibration being generated.

[0045] Furthermore, inner edge 18b of third swirl vane 18 is also integrated with straight pipe portion 24a and tapered pipe portion 24b, so third swirl vane 18 is firmly fixed to cylindrical portion 24. Therefore, even if wastewater flows inside joint 1 and third swirl vane 18 converts the wastewater into a swirling flow, there is little risk of third swirl vane 18 vibrating, and there is also little risk of noise being generated due to vibration. In addition, the peripheral walls of the straight pipe section 24a and the tapered pipe section 24b are formed around the entire circumference, and the areas where the second swirl vanes 17 and the third swirl vanes 18 are not provided also serve as reinforcing walls 24d, thereby reducing the risk of the second swirl vanes 17 and the third swirl vanes 18 vibrating.

[0046] The joint 1 shown in Figure 1 has an upper receiving member 20 on top of the upper tubular portion 13, and the portion that receives the vertical drainage pipe 5 on the upper floor side is covered with the seal main body portion 28, so that the portion that receives the vertical drainage pipe 5 on the upper floor side is less likely to leak.

[0047] In the case of the joint 1 shown in Figure 1, when a fire breaks out on a floor below the floor slab S, the heat of the fire causes the thermal expansion material 35 to expand, preventing the joint 1 from melting and falling, and the thermal expansion material 35 also blocks the space inside the lower connection part 15 (the internal space of the tubular part 24). This prevents flames, smoke, etc. from passing through the internal space of the joint 1 and rising to floors above the floor slab S. Therefore, the joint 1 is able to exhibit fire resistance. In this case, the thermal expansion material 35 is provided between the second swirl vane 17, the third swirl vane 18 and the vertical rib 12b, so that when the thermal expansion material 35 thermally expands, these swirl vanes 17, 18 and the vertical rib 12b do not hinder the thermal expansion.

[0048] In a building, wastewater collected in horizontal pipe 6 flows into joint 1. When the flow rate is high, the wastewater occupies most of the space inside horizontal pipe 6, but when the flow rate is low, the wastewater flows along the lower end of horizontal pipe 6. For example, in Fig. 1, wastewater that flows from the horizontal pipe 6 into the collecting section 12 of the joint 1 hits the vertical rib 12b and is guided downward, preventing the wastewater from flowing back into other horizontal pipes. For example, wastewater that flows downward through the vertical drainage pipe 5 is treated appropriately by wastewater treatment equipment (not shown).

[0049] The joint 1 shown in Fig. 1 has excellent sound insulation properties because it is covered with a first sound-insulating cover 30, a second sound-insulating cover 31, and a third sound-insulating cover 36. For example, even if drainage water passes through the inside, the structure makes it difficult for the drainage noise to leak to the outside. Furthermore, the first sound-insulating cover 30 is attached to the outer surface of the upper tubular portion 13, and the second sound-insulating cover 31 is attached to the outer surfaces of the upper tubular portion 13 and the collecting portion 12. Therefore, the first sound-insulating cover 30 can be fastened to the outer surface of the upper tubular portion 13, and the second sound-insulating cover 31 can be fastened to the outer surfaces of the upper tubular portion 13 and the collecting portion 12. Because the first sound-insulating cover 30 and the second sound-insulating cover 31 can be fastened and attached individually, they can be tightly attached individually and their individual positions can be finely adjusted. This prevents deformation and deflection of the sound-insulating covers.

[0050] In the joint 1 of the first embodiment shown in Figure 1, the first swirl vane 16 is provided inside the upper tubular portion 13. However, in addition to the first swirl vane 16, a deflector vane may be provided so as to protrude diagonally upward and downward from the inner surface of the peripheral wall of the upper tubular portion 13. In addition to the first swirl vane 16, a deflector vane may be used to generate a swirling flow or a deflected flow in the wastewater flow, thereby rectifying the wastewater and smoothing its flow. Furthermore, if a deflector vane is provided, the first swirl vane 16 may be omitted. Furthermore, in the fitting 1 of the first embodiment, the vertical pipe connection portion 10 and the upper tubular portion 13 are separate components that are integrated by fitting together, but the vertical pipe connection portion 10 and the upper tubular portion 13 may also be formed from a single molded resin component.

[0051] (Fitting structure of the assembly part and the lower connection part of the joint) The joint 1 of the first embodiment employs a structure in which a socket 12B is formed at the bottom of the assembly portion 12, and the upper end of the lower connecting portion 15 is fitted into this socket 12B as a spigot. An overview of this structure is shown in Figure 7. Contrary to the structure shown in Figure 7, a structure may be adopted in which a socket 15g is formed at the upper end of the lower connection part 15 and the lower end of the assembly part 12 is used as a spigot to fit into the socket 15g, as shown in Figure 8.

[0052] (Modified joints) In the first embodiment of the joint 1, the second swirl vane 17 and the third swirl vane 18 are formed so as to protrude in a fin-like manner from the inner surface of the straight pipe section 24a and the tapered pipe section 24b, and nothing in particular is formed on the outer surface of the straight pipe section 24a and the tapered pipe section 24b. However, grooves can be formed on the outer surfaces of the straight pipe portion 24a and the tapered pipe portion 24b so as to correspond to the positions where the second swirl vanes 17 and the third swirl vanes 18 are formed.

[0053] Figure 9 shows an example in which a third swirl vane 18 is provided inside the tapered pipe section 24b, and a groove portion 24c is provided along the inner edge portion 18b of the third swirl vane 18 in part of the outer wall of the tapered pipe section 24b, corresponding to the part where the third swirl vane 18 is provided. When the cylindrical portion 24 including the third swirl vane 18 is manufactured by resin molding using a mold, the groove 24c can be used as a groove for preventing undercutting of the mold. When groove 24c is formed in cylindrical portion 24, a gap is created between cylindrical portion 24 and tapered cylindrical portion 15b, and this gap can be filled with refractory material 34. Groove 24c can also be provided on the cylindrical portion 24 on the side where second swirl vanes 17 are formed. Instead of the fireproof material 34, a vibration suppressing member such as a rubber vibration damping material may be placed in this gap.

[0054] In the structure of the first embodiment, the second swirl vanes 17 and the third swirl vanes 18 are provided on the inner peripheral side of the cylindrical portion 24 consisting of the straight pipe portion 24a and the tapered pipe portion 24b. Although the structure of the first embodiment is advantageous for suppressing vibration of the second swirl vane 17 and the third swirl vane 18, if these are made of resin and mass-produced using molds, the structure is disadvantageous in terms of molding.

[0055] FIG. 6 shows a reference example structure in which two swirl vanes 41 are provided at the bottom of a cylindrical portion 40, taking into consideration the die-cutting surface. 6 shows a structure in which two arc-shaped swirl vanes 41 are provided at an angle at 180° intervals around the circumference of the cylindrical portion 40 at the bottom of the cylindrical portion 40. The two swirl vanes 41 are formed to extend downward from the bottom of the cylindrical portion 40, and a support wall 42 of a predetermined width is formed on the side of each swirl vane 41 from the lower end of the cylindrical portion 40 along the swirl vane 41. A notch 43 of a predetermined width is formed between one swirl vane 41 and support wall 42 and the other swirl vane 41 and support wall 42.

[0056] The structure shown in Figure 6 allows for mass production by resin molding, but since it is a similar structure to one in which swirl vanes 41 are suspended and supported at the bottom of tubular portion 40, there is a risk of noise being generated when wastewater hits swirl vanes 41 and generates a swirling flow. Below, we will explain the structure of a second embodiment, which has a structure that generates a swirling flow by providing two swirling vanes, reduces the risk of noise generation, and can be mass-produced using a molding method using a mold, and can be demolded.

[0057] (Second embodiment) 10 to 12 show a cylindrical portion 47 equipped with second swirl vanes 45 and third swirl vanes 46 suitable for use in a joint according to a second embodiment of the present invention. The cylindrical portion 47 has a straight pipe portion 47a and a tapered pipe portion 47b, and the second swirl vane 45 and the third swirl vane 46 are integrated inside the cylindrical portion 47. The diameter and length of the straight pipe portion 47a are equivalent to those of the straight pipe portion 24a used in the first embodiment. The diameter and length of the tapered pipe portion 47b are also equivalent to those of the tapered pipe portion 24b used in the first embodiment. The shape, size, tilt direction, etc. of the second swirl vanes 45 may be the same as the shape, size, tilt direction, etc. of the second swirl vanes 17 of the first embodiment. The shape, size, tilt direction, etc. of the third swirl vane 46 may be the same as the shape, size, tilt direction, etc. of the third swirl vane 18 of the first embodiment.

[0058] Similar to the second swirl vane 17, the second swirl vane 45 is made up of an arc-shaped vane plate 45a, has an arc-shaped inner edge portion 45b, and has a linear outer edge portion 45c. The vane plate 45a is integrated with the inner surface of the straight pipe portion 47a and the inner surface of the tapered pipe portion 47b via the inner edge portion 45b. Similar to the third swirl vane 18, the third swirl vane 46 is made up of an arc-shaped vane plate 46a, has an arc-shaped inner edge portion 46b, and has a linear outer edge portion 46c. The vane plate 46a is integrated with the inner surface of the straight pipe portion 47a and the inner surface of the tapered pipe portion 47b via the inner edge portion 46b. The blade 45a of the second swirl blade 45 is formed to have a size that extends from the straight pipe portion 47a to the lower end side of the tapered pipe portion 47b. The third swirl vane 46 is formed slightly smaller than the second swirl vane 45, and the vane plate 46a of the third swirl vane 46 is formed to a size that reaches from the lower side of the straight pipe portion 47a to the lower end side of the tapered pipe portion 47b.

[0059] The structure of the second embodiment differs from that of the first embodiment in that a notch is formed between the second swirl vane 45 and the third swirl vane 46, which are formed at 180° intervals around the circumference of the cylindrical portion 47. In this embodiment, the second swirl vane 45 is formed slightly larger than the third swirl vane 46, and therefore the following description will distinguish between the notch 48 formed adjacent to the second swirl vane 45 and the notch 49 formed adjacent to the third swirl vane 46. If the second swirl vane 45 and the third swirl vane 46 are formed to the same size, the notches adjacent to them will have the same size and shape, and therefore the notch 48 and the notch 49 may be formed to the same size and shape.

[0060] A notch 48 is formed in the cylindrical portion 47 in the circumferential direction of the cylindrical portion 47 at a position adjacent to the second swirl vane 45, and reaches the tip of the cylindrical portion 47. The contour of the notch 48 is defined by a contour portion described below. The notch 48 is provided adjacent to the second swirl vane 45 from one end to the other. 11, the position where the inner edge portion 45b of the second swirl vane 45 contacts the inner peripheral surface of the straight pipe portion 47a and the inner peripheral surface of the tapered pipe portion 47b forms part of the contour of the cutout portion 48. The position where the inner edge portion 45b contacts the inner peripheral surface of the straight pipe portion 47a and the inner peripheral surface of the tapered pipe portion 47b is tentatively referred to as a first contour portion L1.

[0061] The portion extending from vertex position a (see FIG. 11) of second swirl vane 45, where inner edge portion 45b and outer edge portion 45c of second swirl vane 45 intersect, along the peripheral wall of straight pipe portion 47a, to the boundary position with tapered pipe portion 47b in the length direction of straight pipe portion 47a, constitutes part of the contour of cutout portion 48. This portion is tentatively referred to as second contour portion L2. The portion extending from the boundary position to the lower end position of the tapered pipe portion 47b along the length of the straight pipe portion 47a constitutes part of the contour of the cutout portion 48. This portion is tentatively referred to as a third contour portion L3.

[0062] In addition, the position where the third contour portion L3 reaches the lower end of the tapered pipe portion 47b is referred to as the lower end position b, and the position where the inner edge portion 45b and the outer edge portion 45c of the second swirl vane 45 reach the lower end of the tapered pipe portion 47b is referred to as the lower end position c. Notch 48 can be described as a notch defined by first contour portion L1, second contour portion L2, and third contour portion L3, and defined by a portion that opens to the lower end of tapered tube portion 47b between lower end position b and lower end position c. When cylindrical portion 47 is viewed in a plan view, notch 48 is formed along the circumferential direction of cylindrical portion 47 along a region where convoluted inner edge portion 45b exists.

[0063] A notch 49 is formed in the cylindrical portion 47 at a position adjacent to the third swirl vane 46 in the circumferential direction of the cylindrical portion 47. The contour of the notch 49 is defined by a contour described below. The position where the inner edge portion 46b of the third swirl vane 46 contacts the inner peripheral surface of the straight pipe portion 47a and the inner peripheral surface of the tapered pipe portion 47b forms part of the contour of the cutout portion 49. The position where the inner edge portion 46b contacts the inner peripheral surface of the straight pipe portion 47a and the inner peripheral surface of the tapered pipe portion 47b is tentatively referred to as a fourth contour portion L4. The portion extending from the apex position e (see FIG. 10) of the third swirl vane 46, where the inner edge portion 46b and the outer edge portion 46c of the third swirl vane 46 intersect, along the peripheral wall of the straight pipe portion 47a in the lengthwise direction of the straight pipe portion 47a to the boundary position with the tapered pipe portion 47b, constitutes part of the contour of the cutout portion 49. This portion is tentatively referred to as a fifth contour portion L5.

[0064] The portion extending from the boundary position along the length of the straight pipe portion 47a to the lower end position of the tapered pipe portion 47b constitutes part of the contour of the cutout portion 49. This portion is tentatively referred to as a sixth contour portion L6. In addition, the position where the sixth contour portion L6 reaches the lower end of the tapered pipe portion 47b is referred to as the lower end position f, and the position where the inner edge portion 46b and the outer edge portion 46c of the third swirl vane 46 reach the lower end of the tapered pipe portion 47b is referred to as the lower end position g. The notch 49 can be described as a notch defined by the fourth contour portion L4, the fifth contour portion L5, and the sixth contour portion L6, and defined by a portion that reaches the lower end of the tapered tube portion 47b between the lower end position f and the lower end position g. When the cylindrical portion 47 is viewed from above, the notch 49 is formed along the circumferential direction of the cylindrical portion 47 along a region where the convoluted inner edge portion 46b is present.

[0065] In the straight pipe portion 47a and the tapered pipe portion 47b, a first reinforcing wall 51 is formed on the lateral side of the cutout portion 48, which has a second contour portion L2 and a third contour portion L3, and which leaves the circumferential walls of the straight pipe portion 47a and the tapered pipe portion 47b intact. The first reinforcing wall 51 is formed around the straight pipe portion 47a and the tapered pipe portion 47b from the lateral side of the cutout portion 48 to a position adjacent to the cutout portion 49. The first reinforcing wall 51 is formed in the inner circumferential direction of the cylindrical portion 47 (in a plan view of the cylindrical portion 47) so as to be adjacent to the cutout portion 48 along a region where the convoluted inner edge portions 45b, 46b are not present.

[0066] Furthermore, in the straight pipe portion 47a and the tapered pipe portion 47b, a second reinforcing wall 52 is formed on the lateral side of the cutout portion 49, which has a fifth contour portion L5 and a sixth contour portion L6, and which leaves the circumferential walls of the straight pipe portion 47a and the tapered pipe portion 47b intact. The second reinforcing wall 52 is formed around the straight pipe portion 47a and the tapered pipe portion 47b from the lateral side of the cutout portion 49 to a position adjacent to the cutout portion 48. The second reinforcing wall 52 is formed adjacent to the cutout portion 49 in the circumferential direction of the tubular portion 47 (in a plan view of the tubular portion 47) along a region where the convoluted inner edge portions 45b, 46b do not exist.

[0067] The cylindrical portion 47 equipped with the second swirl vane 45 and the third swirl vane 46 described in the second embodiment can be applied to the joint 1 having the configuration shown in Figure 1 in place of the cylindrical portion 24 applied in the first embodiment. By applying the cylindrical portion 47 having the second swirl vanes 45 and the third swirl vanes 46 to the joint 1, it is possible to obtain the same effects as those obtained by the joint 1 of the first embodiment. That is, when wastewater flows into the joint 1, a swirling flow is created by using the second swirl vane 45 and the third swirl vane 46, thereby improving the drainage performance.

[0068] Furthermore, in the configuration of the second embodiment, cutouts 48 and 49 are provided, but the second swirl vane 45 and the third swirl vane 46 are reinforced by the first reinforcing wall 51 and the second reinforcing wall 52. Therefore, even if wastewater flows into the inside of the joint 1, there is little risk of vibration occurring in the second swirl vane 45 and the third swirl vane 46, and there is little risk that the second swirl vane 45 and the third swirl vane 46 will become a source of noise associated with drainage. Therefore, by adopting the structure of the second embodiment, it is possible to obtain a joint 1 that is less likely to generate noise associated with drainage.

[0069] Furthermore, in the structure of the second embodiment, when the cylindrical portion 47 equipped with the second swirl vane 45 and the third swirl vane 46 is mass-produced by resin molding, the mold can be easily removed, and a structure can be obtained that does not hinder implementation when using resin molding. For example, the structure has a tapered pipe portion 47b that narrows downward, and has a first reinforcing wall 51 and a second reinforcing wall 52 on the sides of the cutouts 48, 49, but the cutouts 48 and 49 are located beside the first reinforcing wall 51 and the second reinforcing wall 52. This structure does not hinder demolding.

[0070] Here, if the second contour portion L2 and the third contour portion L3 are not parallel to the longitudinal direction of the straight pipe portion 47a in the state shown in Figure 11, but are inclined so that their lower sides are positioned to the right of their upper sides, this will cause problems with demolding. Conversely, if the second contour portion L2 and the third contour portion L3 are not parallel to the longitudinal direction of the straight pipe portion 47a in the state shown in Figure 11, but are inclined so that their lower sides are positioned to the left side of the circumferential direction of the tubular portion 47 rather than their upper sides, there will be no problem with demolding. In other words, it is preferable that the portion of the first reinforcing wall 51 on the straight pipe portion 47a side does not widen toward the bottom, and that the portion of the tapered pipe portion 47b side does not widen toward the bottom. The same is true for the second reinforcing wall 52. By forming the first reinforcing wall 51 and the second reinforcing wall 52 in this manner and forming the cutouts 48, 49 to widen downward, a shape that is advantageous for die-cutting can be obtained.

[0071] (Third embodiment) 13 to 15 show a cylindrical portion 57 equipped with second and third swirl vanes suitable for use in a joint according to a third embodiment of the present invention. This embodiment shows an example in which two second swirl vanes 45, which were used in the previous second embodiment, are provided in the cylindrical portion 57. That is, this embodiment shows two swirl vanes 45 of the same shape and size, one of which is provided as the second swirl vane and the other as the third swirl vane.

[0072] In this embodiment, the two swirl vanes 45 have symmetrical shapes, and therefore, a cutout 49 of the same shape is formed between them. A reinforcing wall 51 of the same shape is formed between one swirl vane 45 and the other swirl vane 45. In the third embodiment, parts that are the same as those in the second embodiment are given the same reference numerals, and a description of the parts with the same configuration will be omitted. As shown in the third embodiment, the two swirl vanes 45 may have the same shape and size. In the third embodiment, the same effects as those in the second embodiment can be obtained.

[0073] (Fourth embodiment) FIG. 16 shows a cylindrical portion 60 equipped with second and third swirl vanes suitable for use in the joint of the fourth embodiment. The structure of the fourth embodiment has the second swirl vanes 45 and third swirl vanes 46 equivalent to those of the second embodiment in the straight pipe section 47a and tapered pipe section 47b, but the shapes of the cutouts 61, 62 formed adjacent to these and the shapes of the reinforcing walls 63, 64 differ from those of the second embodiment. In the second embodiment, a fifth contour portion L5 and a sixth contour portion L6 are formed along the length of the straight pipe portion 47a from the apex position e of the third swirl vane 46. A notch 49 is provided, which is partitioned by the fourth contour portion L4, the fifth contour portion L5, and the sixth contour portion L6, which are formed by the inner edge portion 46b of the third swirl vane 46. Furthermore, a reinforcing wall 52 is provided adjacent to this notch 49.

[0074] In the fourth embodiment, a displacement position h is set at a position spaced a predetermined distance from the apex position e of the third swirl vane 46 along the circumferential direction of the straight pipe portion 47a, and a notch 65 is provided from this displacement position h along the length of the straight pipe portion 47a to separate a seventh contour portion L7 and an eighth contour portion L8. A reinforcing wall 63 is formed adjacent to this notch 65. Further, a displacement position j is set at a position spaced a predetermined distance from the apex position a of the second swirl vane 45 along the circumferential direction of the straight pipe portion 47a, and a notch 66 is provided from this displacement position j along the length of the straight pipe portion 47a to separate a ninth contour portion L9 and a tenth contour portion L10. A reinforcing wall 64 is formed adjacent to this notch 66.

[0075] As in this embodiment, cutouts 65 and 66 may be formed, and reinforcing walls 63 and 64 may be provided adjacent to the sides of the cutouts 65 and 66. 10 to 12, a cutout 48 defined by the first contour portion L1, the second contour portion L2, and the third contour portion L3 is formed, and a reinforcing wall 51 is defined on the side of the cutout 48. In contrast to this, as shown in FIG. 16, a cutout 66 defined by the first contour portion L1, the portion connecting the apex position a and the displacement position j, the ninth contour portion L9, and the tenth contour portion L10 is formed, and a reinforcing wall 64 is formed on the side of the cutout 66.

[0076] 10 to 12, a cutout 49 defined by the fourth contour portion L4, the fifth contour portion L5, and the sixth contour portion L6 is formed, and a reinforcing wall 52 is defined on the side of the cutout 49. In contrast to this, as shown in FIG. 16, a cutout 65 defined by the fourth contour portion L4, the portion connecting the apex position e and the displacement position h, the seventh contour portion L7, and the eighth contour portion L8 is formed, and a reinforcing wall 63 is formed on the side of the cutout 65. The reinforcing walls 63, 64 of the fourth embodiment are narrower than the reinforcing walls 51, 52 of the second embodiment, but are strong enough to reinforce the second swirl vanes 45 and the third swirl vanes 46. Even with the narrow reinforcing walls 64, 65, the effect of suppressing vibrations can be sufficiently obtained by reinforcing the second swirl vanes 45 and the third swirl vanes 46.

[0077] That is, when the cylindrical portion 60 is viewed in a plane, a notch 66 is formed in the circumferential direction of the cylindrical portion 60 along the area where the second swirl vane 45 exists, and a reinforcing wall 64 is formed along the area where the second swirl vane 45 does not exist (the area where the swirl-type inner edge portion 45b does not exist), thereby achieving a vibration suppression effect. Furthermore, when the cylindrical portion 60 is viewed in a plane, a notch 65 is formed in the circumferential direction of the cylindrical portion 60 along the area where the third swirl vane 46 is present, and a reinforcing wall 63 is formed along the area where the third swirl vane 46 is not present (the area where the swirl-type inner edge portion 46b is not present), thereby achieving a vibration suppression effect.

[0078] In this way, by providing reinforcing walls 63, 64 in areas around the tubular portion 60 where the second and third swirl vanes 45, 46 are not provided, a fitting 1 can be provided that has swirl vanes 45, 46 and does not pose the risk of generating noise when draining.

[0079] (Test example) Vibration analysis was carried out using commercially available computer software and a finite element method (FEM) using a resin joint (first example) 1 having the configuration shown in FIG. 1, a joint (comparative example) using a resin tubular portion 40 having the configuration shown in FIG. 6, and a joint (second example) equipped with a resin tubular portion 47 having the configuration shown in FIG. 10. As a result, it was found that the vibration acceleration levels of the joints of the first and second examples were lower than that of the joint of the comparative example in almost all frequency bands, and that vibration could be suppressed. Furthermore, it was found that the joint of the second example had a lower vibration acceleration level in almost the entire frequency range than the joint of the first example, and was able to suppress vibration better.

[0080] Although each embodiment of the present invention has been described in detail above with reference to the drawings, the specific configuration of the present invention is not limited to these embodiments, and the present invention also includes changes, combinations, deletions, etc. of the configuration within the scope that does not deviate from the gist of the present invention.

[0081] For example, the lower connecting portion 15 and the cylindrical portion 24 may be joined with an adhesive, and by bonding, vibration of the cylindrical portion 24 can be suppressed. Furthermore, the cylindrical portion 24 may include only one of the second swirl vanes 17 and the third swirl vanes 18, which facilitates injection molding when the cylindrical portion 24 is integrally molded.

[0082] Furthermore, if the second swirl vanes 17 and the third swirl vanes 18 are formed only in either the straight pipe section 24a or the tapered pipe section 24b, the straight pipe section 24a or the tapered pipe section 24b on which the swirl vanes are not formed may be omitted without being molded, and the tubular section 24 will be considered to have only one of the straight pipe section 24a and the tapered pipe section 24b.

[0083] Furthermore, the tubular portion 24 may be molded into multiple components rather than being molded as a single unit. For example, the tubular portion 24 in Figure 2 of this embodiment may be divided into two components, a first tubular portion 241 and a second tubular portion 242, by dividing it along a plane parallel to the central axis of the lower connecting portion 15 or along a plane perpendicular to the central axis of the lower connecting portion 15. In this case, it is preferable to divide the second swirl vane 17 and the third swirl vane 18 so that they are placed in each of the two members, with the second swirl vane 17 being placed in the first cylindrical portion 241 and the third swirl vane 18 being placed in the second cylindrical portion 242. When the cylindrical portion 24 is divided along a plane parallel to the central axis of the lower connecting portion 15, the first cylindrical portion 241 and the second cylindrical portion 242 are semicircular in top view and become cylindrical when installed inside the lower connecting portion 15, with the joint surface between the first cylindrical portion 241 and the second cylindrical portion 242 being located between the end of the second swirl vane 17 and the end of the third swirl vane 18. On the other hand, when the cylindrical portion 24 is divided along a plane parallel to the central axis of the lower connecting portion 15, the first cylindrical portion 241 and the second cylindrical portion 242 are each cylindrical, and the second swirl vane 17 and the third swirl vane 18 are positioned offset in the pipe axis direction of the lower connecting portion 15. In this case, only one of the second swirl vanes 17 and the third swirl vanes 18 may be provided.

[0084] The thermal expansion material 35 may be cylindrical, or may be provided inside the lower connecting portion 15. The cylindrical thermal expansion material 35 may be disposed inside the lower connecting portion 15 above the upper end of the cylindrical portion 24, or may be disposed inside the lower connecting portion 15 below the lower end of the cylindrical portion 24, or may be disposed between the outer surface of the cylindrical portion 24 and the inner surface of the lower connecting portion 15. The cylindrical thermal expansion material 35 has one of the following structures: a three-layer structure in which a thermoplastic resin layer is formed on the inner and outer peripheral surfaces of a fire-resistant layer containing a thermoplastic resin and thermally expandable graphite; a two-layer structure in which a thermoplastic resin layer is formed on the inner or outer peripheral surface of a fire-resistant layer containing a thermoplastic resin and thermally expandable graphite; and a single-layer structure consisting of a fire-resistant layer containing a thermoplastic resin and thermally expandable graphite. [Explanation of symbols]

[0085] S...Floor slab, 1...Joint, 2...Drainage equipment, 5...Drainage vertical pipe, 6...Horizontal pipe (horizontal drainage branch pipe), 10...vertical pipe connection part, 11...horizontal pipe connection part, 12...collecting part, 12B...receptacle, 15...lower connection portion, 15g...receptacle, 16...first swirl blade (first swirl member), 17... second swirl blade (second swirl member), 18... third swirl blade (third swirl member), 19...through hole, 24...tubular portion, 24a...straight pipe portion, 24b...tapered pipe portion, 24c...groove portion, 34...fireproof material, 45...second swirl blade, 45a...blade, 45b...inner edge portion, 45c...outer edge portion, 46...third swirl blade, 46a...blade, 46b...inner edge portion, 46c...outer edge portion, 47...cylindrical portion, 47a...straight pipe portion, 47b...tapered pipe portion, 48, 49... Notched portion, 51, 52... Reinforcing wall, 57... Cylindrical portion, 63, 64... Reinforcing wall, 65, 66... ​​Cutout portion, L1... First contour portion, L2...second contour portion, L3...third contour portion, L4...fourth contour portion, L5...fifth contour portion, L6...6th contour portion, L7...7th contour portion, L8...8th contour portion, L9...9th contour portion, L10...10th contour section, L11...11th contour section.

Claims

1. A joint to be installed in a through hole provided in a floor slab of a building, a vertical pipe connection portion connected to a vertical pipe extending from an upper floor; a collecting section having a horizontal pipe connecting section to be connected to the horizontal pipe; an upper cylindrical portion that connects the vertical pipe connection portion and the collecting portion and has an inner diameter larger than an inner diameter of the vertical pipe; a lower connection portion connected to a vertical pipe extending from the lower floor; Equipped with A joint in which a cylindrical portion is inserted inside the lower connecting portion, swirl vanes having a swirl-type inner edge portion integrated with the inner peripheral surface of the cylindrical portion are integrated at an inclined state, and a reinforcing wall for the swirl vanes, which also serves as the peripheral wall of the cylindrical portion, is provided in an area in the inner peripheral direction of the cylindrical portion where the swirl-type inner edge portion does not exist when the cylindrical portion is viewed in a plane.

2. 2. A joint as described in claim 1, wherein a tapered cylindrical portion having a narrowed tip is formed on the lower end side of the lower connection portion, a tapered pipe portion having a narrowed tip is formed on the lower end side of the cylindrical portion, and the tapered pipe portion is inserted along the inner surface of the tapered cylindrical portion.

3. 2. A joint as described in claim 1, wherein the cylindrical portion has a straight pipe portion formed on the upper side and a tapered pipe portion formed on the lower side, the swirl vane is a swirl vane that extends at an incline from the inner surface of the straight pipe portion along the inner surface of the tapered pipe portion, and the swirl vane has a swirl-type inner edge portion that extends at an incline from the inner surface of the straight pipe portion along the inner surface of the tapered pipe portion.

4. A joint as described in claim 3, wherein a notch adjacent to the swirl vane is provided on the peripheral wall of the cylindrical portion on the side of the swirl vane, from one end of the swirl vane located on the tip side of the tapered pipe portion to the other end of the swirl vane located on the straight pipe portion side.

5. 3. The joint according to claim 1, wherein an upper portion of the cylindrical portion is a spigot that is inserted into a lower portion of the assembly portion.

6. 3. The joint according to claim 1, wherein an upper portion of the cylindrical portion is a socket into which a lower portion of the assembly portion is inserted.

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