Collective joint

Abstract

To obtain a collective joint capable of suppressing occurrence of a negative pressure.SOLUTION: A collective joint 25 is installed in an open hole H provided in a floor slab S of a building. The collective joint 25 comprises: an assembly part 65 having a vertical pipe connection part 46 connected to a vertical pipe 10 extending from an upper floor and a horizontal pipe connection part 28 connected to a horizontal pipe 20; a lower connection part 36 connected to a vertical pipe 15 extending from a lower floor; and an intermediate member 61 that is disposed between the assembly part 65 and the lower connection part 36 and forms a drainage flow channel for discharging water. Inner diameter of a flow channel formation part 62 forming the drainage flow channel of the intermediate member 61 is larger than 125 mm and smaller than 160 mm.SELECTED DRAWING: Figure 1

Description

[Technical Field]

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

[0002] A common joint is described in Patent Document 1 below. The common joint is installed in a through-hole provided in the floor slab of a building. This common joint includes a common section having a vertical pipe connection section connected to a vertical pipe extending from an upper floor and a horizontal pipe connection section connected to a horizontal pipe, a lower connection section connected to a vertical pipe extending from a lower floor, and an intermediate member disposed between the common section and the lower connection section. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Publication No. 2022-87083 Summary of the Invention [Problem to be solved by the invention]

[0004] The inventors of the present application discovered that when wastewater from the upper floor flowing through the vertical pipe and wastewater flowing through the horizontal pipe join at the joining point of the collecting joint, the inside of the collecting joint is pseudo-sealed by the wastewater in the intermediate member at the joining point. If the inside of the collecting joint is sealed by the wastewater in this way, for example, when wastewater from the lower floor flows down in the vertical pipe of the lower floor, negative pressure may be generated between the part sealed by the wastewater and the part through which the wastewater flows. In this case, if the negative pressure extends to the drainage equipment on each floor, there is a possibility that the water seals, such as drain traps, may be broken.

[0005] The present invention has been made to solve such problems, and has as its object to provide a joint assembly that can suppress the generation of negative pressure. [Means for solving the problem]

[0006] In order to achieve the above-mentioned object, the collective joint of the present invention is a collective joint that is installed in a through hole provided in the floor slab of a building, and comprises a collective part having a vertical pipe connection part that is connected to a vertical pipe extending from an upper floor and a horizontal pipe connection part that is connected to a horizontal pipe, a lower connection part that is connected to a vertical pipe extending from a lower floor, and an intermediate member that is positioned between the collective part and the lower connection part and forms a drainage flow path, and the inner diameter of the flow path forming part that forms the drainage flow path of the intermediate member is greater than 125 mm and less than 160 mm.

[0007] In this manifold, the inner diameter of the flow path forming portion of the intermediate member is greater than 125 mm and smaller than 160 mm. Having an inner diameter of the flow path forming portion of the intermediate member greater than 125 mm ensures a sufficient flow path cross-sectional area for the flow path forming portion of the intermediate member, preventing the interior of the intermediate member from being sealed off by drainage and suppressing the generation of negative pressure. On the other hand, having an inner diameter of the flow path forming portion of the intermediate member smaller than 160 mm prevents the manifold from becoming excessively large, enabling, for example, space savings.

[0008] In the collective joint according to the present invention, the intermediate member may be disposed across the collective portion and the lower connection portion, and the entire axial length may serve as the flow path forming portion.

[0009] In this mass joint, the shape of the intermediate member can be simplified to, for example, a cylindrical shape, and therefore the manufacturing thereof is easy.

[0010] In the collective joint according to the present invention, the intermediate member may have an upper end portion that forms a socket into which the collective portion is inserted.

[0011] In this collective joint, the collective portion and the intermediate member can be easily connected.

[0012] In the collective joint according to the present invention, the intermediate member may have a lower end portion that forms a socket into which the lower connecting portion is inserted.

[0013] In this assembly joint, the lower connection portion and the intermediate member can be easily connected.

[0014] In the collective joint according to the present invention, the intermediate member may have a spigot whose lower end is inserted into the lower connection portion.

[0015] In this assembly joint, the lower connection portion and the intermediate member can be easily connected.

[0016] In the collective joint of the present invention, the lower end of the collective part may be a spigot that is inserted into the lower connection part, and the intermediate member may be arranged within the collective part, with the entire axial direction being the flow path forming part.

[0017] In this collective joint, the collective portion and the lower connection portion can be easily connected. Also, in this collective joint, the intermediate member can be made to have a simple shape, which makes it easy to manufacture.

[0018] In the collective joint of the present invention, the lower end of the collective part may be a receiving port into which the lower connection part is inserted, and the intermediate member may be arranged within the collective part, with the entire axial direction being the flow path forming part.

[0019] In this collective joint, the collective portion and the lower connection portion can be easily connected. Also, in this collective joint, the intermediate member can be made to have a simple shape, which makes it easy to manufacture. [Effects of the Invention]

[0020] The collective joint of the present invention can provide a collective joint that can suppress the generation of negative pressure. [Brief explanation of the drawings]

[0021] [Figure 1] 1 is a cross-sectional front view of a group joint according to a first embodiment of the present invention. [Figure 2] FIG. 2 is a perspective cross-sectional view of the upper connecting pipe of the same joint assembly. [Figure 3] FIG. 2 is a cross-sectional view of the upper connecting pipe as viewed from the front. [Figure 4] FIG. 10 is a cross-sectional front view of a collective joint in which reinforcing ribs are provided on the swirl vanes. [Figure 5] 5 is a view seen in the direction of the arrow A in FIG. 4. [Figure 6] 10 is a bottom view showing a modified example of the arrangement of the reinforcing ribs. FIG. [Figure 7] 10A to 10C are cross-sectional views showing examples of the shape of a reinforcing rib. [Figure 8] 4A to 4C are cross-sectional views illustrating a method for manufacturing the upper connecting pipe. [Figure 9] FIG. 10 is a cross-sectional side view of a collective joint in a first modified example of the first embodiment of the present invention. [Figure 10] FIG. [Figure 11] FIG. 10 is a cross-sectional front view of a collective joint in a second modified example of the first embodiment of the present invention. [Figure 12] FIG. 10 is a cross-sectional front view of a collective joint in a third modified example of the first embodiment of the present invention. [Figure 13] FIG. 4 is a cross-sectional front view of a group joint according to a second embodiment of the present invention. [Figure 14] FIG. 10 is a cross-sectional front view of a group joint according to a third embodiment of the present invention. [Figure 15] FIG. 10 is a cross-sectional front view of a group joint according to a fourth embodiment of the present invention. [Figure 16] FIG. 10 is a cross-sectional front view of a group joint according to a fifth embodiment of the present invention. [Figure 17] FIG. 10 is a cross-sectional front view of a group joint according to a sixth embodiment of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0022] (First embodiment) Hereinafter, a piping structure in which one embodiment of a group joint according to the present invention is used will be described with reference to FIGS. As shown in Fig. 1, the piping structure 1 includes a vertical pipe 10 extending from an upper floor, a vertical pipe 15 extending from a lower floor, a horizontal pipe 20, and a manifold joint 25 of this embodiment. In Fig. 1, the vertical pipes 10, 15 and the horizontal pipe 20 are indicated by two-dot chain lines. The vertical pipes 10, 15 and the horizontal pipe 20 are formed in a tubular shape from vinyl chloride resin or the like. The vertical pipe 10 and the vertical pipe 15 extend in the vertical direction. The vertical pipe 10 is disposed above the vertical pipe 15. The upper end of the vertical pipe 10 is connected to a vertical pipe 10 which is connected to the lower end of a collecting joint 25 on the upper floor. The lower end of the vertical pipe 15 is connected to the upper end of a collecting joint 25 on the lower floor and a leg joint (not shown). The horizontal pipe 20 is disposed along a horizontal plane with a water gradient. A drainage facility is connected to a first end of the horizontal pipe 20. The collective joint 25 is installed in a through hole H provided in the floor slab S of the upper floor that separates the upper floor from the lower floor.

[0023] 1 to 3, the joint assembly 25 has an upper connecting pipe 26, a lower connecting pipe 36 (lower connecting portion), a vertical pipe connecting portion 46, and an intermediate member 61. In addition, in Fig. 2, inner surfaces 27b1, 27b2, 27b3, and 27b4, which will be described later, are shown with different hatching for cores 101, 102, and 103, which will be formed, respectively. Here, the upper connecting pipe 26, the lower connecting pipe 36, and the intermediate member 61 are formed in a tubular shape, and the vertical pipe connecting portion 46 is formed in a cylindrical shape. The respective central axes of the upper connecting pipe 26, the lower connecting pipe 36, the vertical pipe connecting portion 46, and the intermediate member 61 are arranged coaxially with a common axis. Hereinafter, the common axis will be referred to as the first axis O1. The direction along the first axis O1 will be referred to as the first axis O1 direction. The direction perpendicular to the first axis O1 will be referred to as the radial direction, and the direction circumferential around the first axis O1 will be referred to as the circumferential direction.

[0024] As shown in FIGS. 1 to 3, the upper connecting pipe 26 has an upper joint body 27, a horizontal pipe connecting portion 28, a locking portion 29, a first swirl vane 30, and vertical ribs 31 and 32. The upper joint body 27 is formed in a cylindrical shape. The upper joint body 27 is disposed on the first axis O1. The outer peripheral surface 27a of the upper connecting pipe 26 is curved around the first axis O1. The horizontal pipe connecting portion 28 is formed in a cylindrical shape. The horizontal pipe connecting portion 28 is provided on an outer peripheral surface 27a of an intermediate portion in the first axis O1 direction of the upper joint body 27 (joint body 51 described later). The space within the horizontal pipe connecting portion 28 and the space within the upper joint body 27 are in communication with each other.

[0025] The locking portion 29 is formed in an annular shape and is provided on an inner circumferential surface 27b of a middle portion in the direction of the first axis O1 of the upper joint body 27. The locking portion 29 is disposed below the opening 28a of the horizontal pipe connecting portion 28. The locking portion 29 protrudes radially inward from the inner peripheral surface 27b of the upper joint body 27. The locking portion 29 is formed around the entire circumference of the upper joint body 27. A surface 29a of the locking portion 29 facing radially inward is inclined so as to gradually approach the first axis O1 from top to bottom. The lower part of the upper connecting pipe 26 below the locking part 29 is a socket into which an intermediate pipe (not shown) is inserted. If the connecting part 38 of the lower connecting pipe 36 is a spigot, the connecting part 38 of the lower connecting pipe 36 may be inserted into the lower socket of the upper connecting pipe 26.

[0026] The first swirl vane 30 is formed in a curved flat plate shape and is provided on the inner circumferential surface 27b of the upper joint body 27. The first swirl vanes 30 are arranged in the direction of the first axis O1 over the entire range of the opening 28a of the horizontal pipe connecting portion 28. The opening 28a here refers to the opening at the radially inner end of the horizontal pipe connecting portion 28. The first swirl vane 30 only needs to be positioned so that at least a portion of it overlaps the opening 28a of the horizontal pipe connecting portion 28 in the direction of the first axis O1. The first swirl vane 30 has an upper surface 30a and a lower surface 30b. The upper surface 30a of the first swirl vane 30 is gradually inclined downward toward a first side D1 in the circumferential direction (hereinafter simply referred to as the first side D1). In this example, the upper surface 30a (an extension of the upper surface 30a) is perpendicular to the first axis O1.

[0027] 4, the first swirl vane 30 preferably has a protrusion or plate-like reinforcing rib 41 on the underside 30b of the first swirl vane 30 to suppress vibration of the first swirl vane 30. In particular, the reinforcing rib 41 is preferably provided so as to connect the underside 30b of the first swirl vane 30 to the second inner surface 27b2 of the upper joint body 27, and it is preferable that the first swirl vane 30, the reinforcing rib 41, and the upper joint body 27 are integrally configured. When the reinforcing rib 41 is a flat plate, the plane of the reinforcing rib 41 is preferably parallel to the first axis O1 or the pipe axis of the horizontal pipe connecting portion 28, and the reinforcing rib 41 may be configured with a plane parallel to the first axis O1 and a plane parallel to the pipe axis of the horizontal pipe connecting portion 28.

[0028] As shown in FIG. 4, when the reinforcing rib 41 is provided so that its plane is parallel to the first axis O1, the reinforcing rib 41 preferably has a draft gradient by decreasing its thickness downward. When the reinforcing rib 41 is plate-shaped, the reinforcing rib 41 is preferably provided perpendicular to the pipe axis of the horizontal pipe connection portion 28 (see FIG. 5) or inclined toward the first axis O1 (see FIG. 6). The number of reinforcing ribs 41 is not particularly limited and may be one or more. When multiple reinforcing ribs 41 are provided on the first swirl vane 30, the multiple reinforcing ribs 41 are preferably parallel to each other. Therefore, when the reinforcing ribs 41 are inclined toward the first axis O1 as shown in FIG. 6, the inclination angles of the reinforcing ribs 41 are preferably the same, and it is not necessary for all of the reinforcing ribs 41 to be strictly inclined toward the first axis O1.

[0029] The shape of the reinforcing rib 41 is not particularly limited as long as it does not hinder the inflow of wastewater from the horizontal pipe 20. The shape of the reinforcing rib 41 may be, for example, a triangle as shown in Fig. 7(a), a rectangle as shown in Fig. 7(b), or a shape with a notch provided in part as shown in Fig. 7(c).

[0030] The reinforcing rib 41 may not be provided.

[0031] The vertical ribs 31, 32 are provided on the inner peripheral surface 27b of the upper joint body 27. The vertical ribs 31, 32 each protrude radially inward from the inner peripheral surface 27b of the upper joint body 27 and extend along the up-down direction. The upper ends of the vertical ribs 31, 32 are disposed within the range of the opening 28a of the horizontal pipe connecting portion 28 in the direction of the first axis O1. The lower end of the vertical rib 31 is disposed at a position in the direction of the first axis O1 that is equivalent to the lower end of the locking portion 29. The lower end of the vertical rib 32 extends downward further than the locking portion 29. The longitudinal ribs 31, 32 are arranged at intervals from each other in the circumferential direction.

[0032] As shown in FIGS. 2 and 3, the inner circumferential surface 27b of the upper joint body 27 (joint body 51 described later) has a first inner surface 27b1, a second inner surface 27b2, a third inner surface 27b3, and a fourth inner surface 27b4. The first inner surface 27b1 is inclined so as to gradually approach the first axis O1 from top to bottom. The first inner surface 27b1 is formed at a position that does not overlap with the first swirl vane 30 in the circumferential direction and is higher than the first swirl vane 30. The second inner surface 27b2 is disposed below the first swirl vane 30. In this example, the second inner surface 27b2 is parallel to the first axis O1 (see FIG. 3). The third inner surface 27b3 is inclined so as to gradually move away from the second axis O2 of the horizontal pipe connecting portion as it approaches the horizontal pipe connecting portion . The fourth inner surface 27b4 is formed so as to be continuous with the first inner surface 27b1 and the second inner surface 27b2. The fourth inner surface 27b4 is inclined so as to gradually move radially outward (away from the first axis O1) as it extends from bottom to top. The fourth inner surface 27b4 may be parallel to the first axis O1.

[0033] The upper joint body 27, horizontal pipe connecting portion 28, locking portion 29, first swirl vane 30, and vertical ribs 31, 32 of the upper connecting pipe 26 are integrally formed by injection molding using vinyl chloride resin or the like. That is, the first swirl vane 30 is integrally formed with the upper connecting pipe 26.

[0034] As shown in FIG. 1, the lower connecting pipe 36 has a lower joint body 37, a connecting portion 38, a second swirl vane 39, and a vertical pipe connecting portion 40. The upper joint body 27, the lower joint body 37, and the connecting portion 38 constitute a joint body 51. The first axis O1 is also the axis of the joint body 51. The upper joint body 27 of the upper connecting pipe 26 is the portion of the joint body 51 where at least the first swirl vane 30 is provided.

[0035] The lower joint body 37, the connection portion 38, and the vertical pipe connection portion 40 are each formed in a cylindrical shape and are disposed coaxially with the first axis O1. The inner diameter and outer diameter of the lower joint body 37 gradually decrease from the top to the bottom. The connecting portion 38 is fixed to the outer peripheral surface of the upper end portion of the lower joint body 37. The connecting portion 38 protrudes upward from the lower joint body 37. The second swirl vane 39 is formed in a curved flat plate shape. The second swirl vane 39 is provided on the inner peripheral surface of the lower joint body 37. The upper surface 39a of the second swirl vane 39 is gradually inclined downward as it approaches the first side D1. The vertical pipe connecting portion 40 is fixed to the outer peripheral surface of the lower end portion of the lower joint body 37. The vertical pipe connecting portion 40 protrudes downward from the lower joint body 37.

[0036] The lower joint body 37, the connection part 38, the second swirl vane 39, and the vertical pipe connection part 40 of the lower connection pipe 36 are integrally formed by injection molding using vinyl chloride resin or the like. In addition, the second swirl vane 39 may be injection molded separately and installed inside the lower connecting pipe 36 by adhering or fitting to the lower connecting pipe 36, or the entire upper connecting pipe 26 and the lower connecting pipe 36 may be integrally formed by injection molding. The upper end of the connecting portion 38 of the lower connecting pipe 36 is fixed to the lower end of the upper joint body 27 of the upper connecting pipe 26 by adhesive or the like. The joint body 51 configured as above is disposed so that the first axis O1 extends along the vertical direction. A sound insulating cover may be wrapped around the radially outer side of the lower connecting pipe 36.

[0037] The vertical pipe connecting portion 46 has a main body 47, a locking portion 48, and a sealing member (not shown). The main body 47 is formed in a cylindrical shape and is disposed on the first axis O1. The lower part of the main body 47 is fitted into the upper joint main body 27 of the upper connecting pipe . The locking portion 48 is formed in an annular shape and is fixed to the lower end portion of the main body 47. The locking portion 48 protrudes from the lower end portion of the main body 47 inward in the radial direction. The sealing member is a packing etc. The sealing member is disposed on the radially inner side of the main body 47. It is to be noted that the vertical pipe connecting portion 46 does not necessarily have to have a sealing member. The vertical pipe connecting portion 46 does not have a swirl vane formed therein.

[0038] The lower end of the vertical pipe 10 is disposed within the main body 47 of the vertical pipe connecting part 46, and is engaged with the engaging part 48 from above, thereby connecting to the vertical pipe connecting part 46. The sealing member provides a watertight seal between the main body 47 and the vertical pipe 10. The upper end of the vertical pipe 15 is disposed within the vertical pipe connecting portion 40 of the lower connecting pipe 36 and is connected to the vertical pipe connecting portion 40 . A second end of the horizontal pipe 20 opposite to the first end is disposed within a horizontal pipe connecting portion 28 of the upper connecting pipe 26 and is connected to the horizontal pipe connecting portion 28 .

[0039] The assembly section 65 consists of a vertical pipe connection section 46 that connects to the vertical pipe 10 extending from the upper floor, and an upper connecting pipe 26 that has an upper joint body 27 and a horizontal pipe connection section 28 that connects to the horizontal pipe 20.

[0040] The intermediate member 61 is disposed between the collecting portion 65 and the lower connecting pipe 36. The intermediate member 61 is fitted into a collecting downstream portion 66 below the locking portion 29 of the upper joint body 27 of the upper connecting pipe 26 that constitutes the collecting portion 65, and into the connecting portion 38 of the lower connecting pipe 36. The inner diameter of the collecting downstream portion 66 of the upper connecting pipe 26 and the inner diameter of the connecting portion 38 of the lower connecting pipe 36 are the same. The radially inner side of the intermediate member 61 constitutes a drainage flow path for drainage through which wastewater flows in the collecting joint 25. The radially inner portion of the intermediate member 61 constitutes a flow path forming portion 62 that forms the drainage flow path.

[0041] The intermediate member 61 is cylindrical with a constant inner diameter and a constant outer diameter. The intermediate member 61 is disposed across the collecting downstream section 66 of the collecting section 65 and the connecting section 38 of the lower connecting pipe 36, and the entire axial length of the inner periphery forms the flow path forming section 62. The upper part of the flow path forming section 62 overlaps with the collecting downstream section 66 of the collecting section 65 in the vertical direction, and the lower part, which is directly below the collecting section 65, overlaps with the connecting section 38 of the lower connecting pipe 36 in the vertical direction.

[0042] The intermediate member 61 has one of 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, or a single-layer structure consisting of a fire-resistant layer containing a thermoplastic resin and thermally expandable graphite.

[0043] The intermediate member 61 is formed by extrusion molding in all three-layer, two-layer, and single-layer structures. In the case of a single-layer structure, it can also be formed by injection molding. When formed by injection molding, it is possible to integrally mold rectifying blades on the inside. The rectifying blades may be formed separately and bonded to the intermediate member 61.

[0044] Here, the fire-resistant layer contains, for example, a thermoplastic resin and flaky thermally expandable graphite. In this case, it preferably contains 100 parts by mass of the thermoplastic resin and 3 to 20 parts by mass of the flaky thermally expandable graphite. The thermoplastic resin of the fire-resistant layer and the thermoplastic resin layer are, for example, polyvinyl chloride resin.

[0045] The outer peripheral surface of the intermediate member 61 may be bonded with an adhesive to the inner peripheral surface of the downstream collecting portion 66 of the upper joint body 27 of the upper connecting pipe 26 and the inner peripheral surface of the connecting portion 38 of the lower connecting pipe 36. When the intermediate member 61 is bonded to the upper connecting pipe 26 and the lower connecting pipe 36 with an adhesive, the upper end of the connecting portion 38 of the lower connecting pipe 36 and the lower end of the upper joint body 27 of the upper connecting pipe 26 do not need to be fixed with an adhesive or the like. When the intermediate member 61 has a two-layer structure of a thermoplastic resin layer and a fire-resistant layer containing a thermoplastic resin and thermally expandable graphite, it is preferable that the outer peripheral surface to which the adhesive is applied is the thermoplastic resin layer.

[0046] In the intermediate member 61, the inner diameter of the flow path forming portion 62 is greater than 125 mm and smaller than 160 mm. The flow path forming portion 62 preferably has an inner diameter greater than 130 mm and smaller than 160 mm. The flow path forming portion 62 more preferably has an inner diameter greater than 135 mm and smaller than 155 mm.

[0047] The collective joint 25 is installed in a through hole H provided in the floor slab S of the building. At that time, the collective downstream portion 66 of the upper connecting pipe 26 and the connection portion 38 of the lower connecting pipe 36 are aligned vertically with the floor slab S. Therefore, the intermediate member 61 of the collective joint 25 is aligned vertically with the floor slab S. The axial length of the intermediate member 61 may be less than the thickness of the floor slab S or may be equal to or greater than the thickness of the floor slab S. When the axial length of the intermediate member 61 is less than the thickness of the floor slab S, it is preferable that the entire axial length of the intermediate member 61 be aligned vertically with the floor slab S. When the axial length of the intermediate member 61 is equal to or greater ... floor slab S be aligned vertically. The gap between the through hole H of the floor slab S and the collective joint 25 is filled with mortar M.

[0048] Next, a description will be given of a method for manufacturing the upper connecting pipe 26 of the collective joint 25 configured as above. The upper connecting pipe 26 is manufactured by injection molding. As shown in FIG. 8, the upper connecting pipe 26 is manufactured by a mold 100 that includes a first core 101, a second core 102, a third core 103, and a cavity (not shown). The first core 101 forms the first inner surface 27b1, the fourth inner surface 27b4 of the upper connecting pipe , the upper surface 30a of the first swirl vane 30, etc., and is pulled out upward relative to the upper connecting pipe . The second core 102 forms the second inner surface 27b2 of the upper connecting pipe 26, the lower end of the lower surface 30b of the first swirl vane 30, etc., and is pulled downward relative to the upper connecting pipe 26. The third core 103 forms the third inner surface 27b3 of the upper connecting pipe 26, the upper end of the lower surface 30b of the first swirl vane 30, etc., and is pulled out radially outward relative to the upper connecting pipe 26.

[0049] The lower surface 30b of the first swirl vane 30 may be formed by the second core 102 alone. Furthermore, when a reinforcing rib is provided on the underside of the first swirl vane 30 to suppress vibration of the first swirl vane 30, the reinforcing rib is formed by the second core 102 or the third core 103. When the reinforcing rib is formed on a plane parallel to the first axis O1, the reinforcing rib is formed together with the underside of the first swirl vane 30 by the second core 102, and when the reinforcing rib is formed on a plane parallel to the pipe axis of the horizontal pipe connection portion 28, the reinforcing rib is formed together with the underside of the first swirl vane 30 by the third core 103. The reinforcing rib may be formed by two cores, the second core 102 and the third core 103.

[0050] Furthermore, as shown in FIG. 4, when the plane of the reinforcing rib 41 is provided in a direction parallel to the first axis O1, the reinforcing rib 41 is preferably formed by the second core .

[0051] Molten synthetic resin is poured between the cavity and the cores 101, 102, and 103, and the molten synthetic resin is solidified by cooling the mold 100. The cores 101, 102, and 103 are pulled out of the cavity, and the cavity is divided appropriately to produce the upper connecting pipe 26.

[0052] As described above, in the collecting joint 25 of the first embodiment, the inner diameter of the flow path forming portion 62 that forms the drainage flow path of the intermediate member 61 is greater than 125 mm and smaller than 160 mm. Having the inner diameter of the flow path forming portion 62 greater than 125 mm makes it possible to ensure a sufficient flow path cross-sectional area of ​​the flow path forming portion 62 of the intermediate member 61, preventing the inside of the flow path forming portion 62 from being sealed off by drainage and suppressing the generation of negative pressure. On the other hand, having the inner diameter of the flow path forming portion 62 smaller than 160 mm prevents the collecting joint 25 from becoming excessively large, making it possible to achieve space savings, for example.

[0053] In the joint joint 25 of the first embodiment, it is preferable that the inner diameter of the flow path forming portion 62 of the intermediate member 61 is greater than 130 mm and smaller than 160 mm. With this configuration, the inner diameter of the flow path forming portion 62 is greater than 130 mm, which makes it possible to more sufficiently ensure the flow path cross-sectional area of ​​the flow path forming portion 62, further preventing the inside of the flow path forming portion 62 from being sealed by drainage, and further suppressing the generation of negative pressure.

[0054] In the collecting joint 25 of the first embodiment, it is preferable that the inner diameter of the flow path forming portion 62 of the intermediate member 61 is greater than 135 mm and smaller than 155 mm. With this configuration, the inner diameter of the flow path forming portion 62 is greater than 135 mm, which makes it possible to more sufficiently ensure the flow path cross-sectional area of ​​the flow path forming portion 62, further suppressing the inside of the flow path forming portion 62 from being sealed by drainage, and further suppressing the generation of negative pressure. On the other hand, the inner diameter of the flow path forming portion 62 is smaller than 155 mm, which prevents the collecting joint 25 from becoming excessively large, thereby enabling, for example, further space savings.

[0055] In the first embodiment of the collecting joint 25, the intermediate member 61 is arranged across the collecting downstream section 66 of the collecting section 65 and the connecting section 38 of the lower connecting pipe 36, so that the shape of the intermediate member 61 can be simplified to, for example, a cylindrical shape, making it easier to manufacture.

[0056] In the collective joint 25 of the first embodiment, the intermediate member 61 includes a thermally expandable fire-resistant material, so that the spread of fire through the collective joint 25 can be suppressed.

[0057] In addition, in the collective joint 25, the upper joint body 27, the horizontal pipe connection portion 28, and the first swirl vane 30 are integrally formed and manufactured by injection molding. Note that, if the first swirl vane 30 has a reinforcing rib 41, the reinforcing rib 41 is also integrally formed and manufactured. For example, wastewater flowing out from the drainage equipment flows into the joint body 51 through the horizontal pipe 20 connected to the horizontal pipe connection part 28 and hits the first swirl vane 30. This wastewater can be caused to flow downward within the joint body 51 while being swirled around the first axis O1 by the first swirl vane 30. This wastewater flows through the vertical pipe 15 and is treated in the wastewater treatment equipment. Since the inner peripheral surface 27b of the upper joint body 27 (joint body 51) has the second inner surface 27b2, the second core 102 drawn downward relative to the upper connecting pipe 26 can form the second inner surface 27b2.

[0058] The inner peripheral surface 27b of the upper joint body 27 has a first inner surface 27b1 that is inclined so as to gradually approach the first axis O1 from top to bottom. Therefore, by pulling the first core 101 upward relative to the joint body 51, the first inner surface 27b1 can be formed while reducing friction between the first inner surface 27b1 and the first core 101 during pulling. As described above, even if the first swirl vanes 30 are provided on the inner peripheral surface 27b of the upper joint body 27, it is possible to provide the upper connecting pipe 26 that can be easily manufactured by injection molding.

[0059] The inner circumferential surface 27b has a third inner surface 27b3. Therefore, when the upper connecting pipe 26 is manufactured by injection molding, the third inner surface 27b3 can be formed by the third core 103 that is drawn outward in the radial direction relative to the upper connecting pipe 26. The inner circumferential surface 27b has a fourth inner surface 27b4, which gradually slopes radially outward as it extends from bottom to top. Therefore, when manufacturing the upper connecting pipe 26 by injection molding, the fourth inner surface 27b4 can be formed by the first core 101 being pulled upward relative to the upper connecting pipe 26, while reducing friction between the fourth inner surface 27b4 and the first core 101 during pulling.

[0060] The upper connecting pipe 26 (manufacturing joint 25) of this embodiment can have a configuration that can be modified in various ways, as will be described below. As in the upper connecting pipe 26A of the collective joint 25A of the first modified example shown in Figures 9 and 10, a recess 27c may be provided in the outer peripheral surface 27a of the upper joint body 27. The recess 27c is recessed radially inward. The recess 27c may be formed in at least a portion of the radially outer side of the second inner surface 27b2. In the first modified example of the collective joint 25A, the distance between the bottom surface of the recess 27c and the second inner surface 27b2 is relatively short, which makes it possible to make the thickness of the entire collective joint 25A as uniform as possible, thereby improving the formability of the collective joint 25A.

[0061] The second inner surface 27b2A may be gradually inclined radially outward from top to bottom, as in the upper connecting pipe 26B of the collective joint 25B of the second modified example shown in Fig. 11. In this case, when manufacturing the upper connecting pipe 26B by injection molding, the second inner surface 27b2A can be formed by using a second core that is drawn downward relative to the upper connecting pipe 26B, reducing friction between the second inner surface 27b2A and the second core during drawing.

[0062] Like the upper connecting pipe 26C of the collective joint 25C of the third modified example shown in Fig. 12, the upper surface 30aA of the first swirl vane 30A may be inclined gradually downward as it moves radially inward. The angle θ formed between the inner circumferential surface 27b of the upper joint body 27 and the upper surface 30aA (first inner surface 27b1) is preferably greater than 90° and equal to or less than 125°. With this configuration, the wastewater that hits the upper surface 30aA of the first swirl vane 30A can be directed not only toward the first side D1 but also toward the first axis O1. This allows the energy of the wastewater to be diverted in more directions, improving the sound insulation of the collective joint 25C.

[0063] As mentioned above, the first swirl vane 30 may be provided with a reinforcing rib 41. When the first swirl vane 30 is provided with a reinforcing rib 41, vibration of the first swirl vane 30 caused by the impact of wastewater can be suppressed. This makes it possible to suppress the generation of noise caused by the vibration of the first swirl vane 30, thereby reducing noise. Furthermore, if the reinforcing rib 41 is provided parallel to the first axis O1, a structure can be achieved that makes it easy to remove the second core 102 even if the reinforcing rib 41 is formed. In addition, if the reinforcing rib 41 has a draft slope, it becomes even easier to remove the second core 102. Therefore, the upper connecting pipe 26 can be easily manufactured by injection molding.

[0064] (Second embodiment) Next, a second embodiment of the present invention will be described mainly with reference to Fig. 13. Note that the same components as those in the first embodiment are given the same reference numerals and their description will be omitted, and differences will be mainly described.

[0065] The collecting joint 105 of the second embodiment that constitutes the piping structure 110 has an intermediate member 111 that is partially different from the intermediate member 61. The intermediate member 111 has an upper end portion that forms an upper socket 112 into which the collecting downstream portion 66 of the collecting portion 65 is inserted, and a lower end portion that forms a lower socket 113 into which the connecting portion 38 of the lower connecting pipe 36 is inserted. The intermediate member 111 has a flow path forming portion 114 between the upper socket 112 and the lower socket 113, which has smaller inner and outer diameters than the upper socket 112 and the lower socket 113 and forms a drainage flow path. In other words, the portion of the intermediate member 111 directly below the upper socket 112 and directly above the lower socket 113 forms the flow path forming portion 114.

[0066] The intermediate member 111 is disposed between the collecting portion 65 and the lower connecting pipe 36. The intermediate member 111 is fitted into the collecting downstream portion 66 of the collecting portion 65 and the connecting portion 38 of the lower connecting pipe 36.

[0067] The upper receiving port 112 of the intermediate member 111 overlaps in the vertical direction with the collecting downstream portion 66 of the collecting portion 65, and the lower receiving port 113 overlaps in the vertical direction with the connecting portion 38 of the lower connecting pipe 36. The vertical middle portion of the intermediate member 111, which is directly below the collecting portion 65 and directly above the lower connecting pipe 36, serves as a flow path forming portion 114 that forms a drainage flow path. The flow path forming portion 114 does not overlap in the vertical direction with the collecting portion 65 or the lower connecting pipe 36. The inner circumferential surface of the flow path forming portion 114 is coaxial and has the same diameter as the inner circumferential surface of the collecting downstream portion 66 of the collecting portion 65, and is also coaxial and has the same diameter as the inner circumferential surface of the connecting portion 38, and is disposed flush with and continuous with these.

[0068] The intermediate member 111 has a single-layer structure made of a fire-resistant layer containing thermoplastic resin and thermally expandable graphite, similar to the first embodiment, and is formed by injection molding. The intermediate member 111 can have flow-straightening blades integrally molded inside the flow path forming portion 114. The flow-straightening blades may be formed separately and bonded to the flow path forming portion 114.

[0069] The intermediate member 111 has the inner circumferential surface of the upper receiving port 112 bonded to the outer circumferential surface of the downstream collecting section 66 with an adhesive, and the inner circumferential surface of the lower receiving port 113 bonded to the outer circumferential surface of the connecting section 38 of the lower connecting pipe 36 with an adhesive.

[0070] The intermediate member 111 has an inner diameter, that is, an inner diameter of the flow path forming portion 114, which is the same as the inner diameter of the flow path forming portion 62 of the first embodiment.

[0071] The collective joint 105 is installed in a through hole H provided in the floor slab S of the building, and the gap between the through hole H and the collective joint 105 is filled with mortar M. The intermediate member 111 of the collective joint 105 overlaps the floor slab S in the vertical direction. The axial length of the intermediate member 111 may be less than the thickness of the floor slab S or may be greater than or equal to the thickness of the floor slab S. When the axial length of the intermediate member 111 is less than the thickness of the floor slab S, it is preferable that the entire axial length overlaps the floor slab S in the vertical direction. When the axial length of the intermediate member 111 is greater than or equal to the thickness of the floor slab S, it is preferable that the entire axial length overlaps the floor slab S in the vertical direction.

[0072] As described above, in the collecting joint 105 of the second embodiment, the inner diameter of the flow path forming section 114 that forms the drainage flow path of the intermediate member 111, i.e., the inner diameter of the portion directly below the collecting section 65, is the same as the inner diameter of the flow path forming section 62 of the intermediate member 61 of the first embodiment, so it is possible to ensure a sufficient flow path cross-sectional area of ​​the flow path forming section 114, which prevents the flow path forming section 114 from being sealed off by drainage, suppresses the generation of negative pressure, and prevents the collecting joint 105 from becoming excessively large, thereby making it possible to achieve space savings, for example.

[0073] In the second embodiment of the collecting joint 105, the upper end portion of the intermediate member 111 above the flow path forming portion 114 serves as an upper receiving port 112 into which the collecting portion 65 is inserted, so that the collecting portion 65 and the intermediate member 111 can be easily connected.

[0074] In the second embodiment of the collective joint 105, the lower end portion of the intermediate member 111 below the flow path forming portion 114 is a lower receiving port 113 into which the lower connecting pipe 36 is inserted, so that the lower connecting pipe 36 and the intermediate member 111 can be easily connected.

[0075] In the collective joint 105 of the second embodiment, the intermediate member 111 includes a thermally expandable fire-resistant material, so that the spread of fire through the collective joint 105 can be suppressed.

[0076] (Third embodiment) Next, a third embodiment of the present invention will be described mainly with reference to Fig. 14. Note that the same components as those in the second embodiment are given the same reference numerals, and their description will be omitted, with differences being mainly described.

[0077] The joint assembly 125 of the third embodiment that constitutes the piping structure 130 has an intermediate member 131 that is partially different from the intermediate member 111. The intermediate member 131 has an upper receiving port 112 and a flow path forming portion 114 similar to those of the intermediate member 111, and its lower end portion directly below the lower connecting pipe 36 serves as a lower spigot 133 (flow path forming portion) that is inserted into the connecting portion 38 of the lower connecting pipe 36 to form a drainage flow path. Therefore, both the inner diameter and the outer diameter of the lower spigot 133 are smaller than those of the flow path forming portion 114.

[0078] The intermediate member 131 is disposed between the collecting portion 65 and the lower connecting pipe 36. The intermediate member 131 is fitted into the collecting downstream portion 66 of the collecting portion 65 and the connecting portion 38 of the lower connecting pipe 36.

[0079] The intermediate member 131 has an upper receiving port 112 that overlaps with the downstream collecting portion 66 of the collecting portion 65 in the vertical direction, and a lower spigot 133 that overlaps with the connecting portion 38 of the lower connecting pipe 36 in the vertical direction.

[0080] The intermediate member 131 has a single-layer structure made of a fire-resistant layer containing thermoplastic resin and thermally expandable graphite, as in the first embodiment, and is formed by injection molding. The intermediate member 131 can have flow-straightening blades integrally molded inside the flow path forming portion 114 or the lower spigot 133. The flow-straightening blades may be formed separately and bonded to the flow path forming portion 114 or the lower spigot 133.

[0081] The intermediate member 131 has the inner circumferential surface of the upper receiving port 112 bonded to the outer circumferential surface of the downstream collecting section 66 with an adhesive, and the outer circumferential surface of the lower spigot 133 bonded to the inner circumferential surface of the connecting section 38 of the lower connecting pipe 36 with an adhesive.

[0082] The inner diameter of the intermediate member 131, that is, the inner diameter of the lower spigot 133, is the same as the inner diameter of the flow path forming portion 62 of the first embodiment.

[0083] The collective joint 125 is installed in a through hole H provided in the floor slab S of the building, and the gap between the through hole H and the collective joint 125 is filled with mortar M. The intermediate member 131 of the collective joint 125 overlaps the floor slab S in the vertical direction. The axial length of the intermediate member 131 may be less than the thickness of the floor slab S or may be equal to or greater than the thickness of the floor slab S. When the axial length of the intermediate member 131 is less than the thickness of the floor slab S, it is preferable that the entire axial length overlaps the floor slab S in the vertical direction. When the axial length of the intermediate member 131 is equal to or greater than the thickness of the floor slab S, it is preferable that the entire axial length overlaps the floor slab S in the vertical direction.

[0084] As described above, in the manifold joint 125 of the third embodiment, the inner diameter of the lower spigot 133 that forms the drainage flow path of the intermediate member 131 is the same as the inner diameter of the flow path forming section 62 of the intermediate member 61 of the first embodiment, so it is possible to ensure sufficient flow path cross-sectional area of ​​the flow path forming section 114 and the lower spigot 133, which prevents the flow path forming section 114 and the lower spigot 133 from being sealed by drainage, suppresses the generation of negative pressure, and prevents the manifold joint 125 from becoming excessively large, thereby making it possible to save space, for example.

[0085] In the third embodiment of the collecting joint 125, the upper end portion of the intermediate member 131 above the flow path forming portion 114 is the upper receiving port 112 into which the collecting portion 65 is inserted, so that the collecting portion 65 and the intermediate member 131 can be easily connected.

[0086] In the third embodiment of the collective joint 125, the lower end of the intermediate member 131 is a lower spigot 133 that is inserted into the lower connecting pipe 36, so that the lower connecting pipe 36 and the intermediate member 131 can be easily connected.

[0087] In the collective joint 125 of the third embodiment, the intermediate member 131 includes a thermally expandable fire-resistant material, so that the spread of fire through the collective joint 125 can be suppressed.

[0088] (Fourth embodiment) Next, a fourth embodiment of the present invention will be described mainly with reference to Fig. 15. Note that the same components as those in the first embodiment are given the same reference numerals, and their description will be omitted, and differences will be mainly described.

[0089] The collecting joint 145 of the fourth embodiment that constitutes the piping structure 160 has a lower connecting pipe 151 (lower connecting portion) that is partially different from the lower connecting pipe 36. The lower connecting pipe 151 has a connecting portion 155 at its upper end that serves as a socket into which the collecting downstream portion 66 of the collecting portion 65 is inserted. Therefore, the collecting downstream portion 66 of the collecting portion 65 serves as a spigot into which the connecting portion 155 is inserted.

[0090] The collecting joint 145 has an intermediate member 161 that is partially different from the intermediate member 61. The intermediate member 161 overlaps in the axial direction with the collecting downstream section 66 of the collecting section 65, and is entirely disposed within the collecting downstream section 66. The intermediate member 161 is cylindrical with a constant inner diameter and a constant outer diameter, and the entire axial length of its inner periphery constitutes a flow path forming section 162 that forms a drainage flow path.

[0091] The intermediate member 161 is disposed between the collecting portion 65 and the lower connecting pipe 151. The intermediate member 161 is fitted into the collecting downstream portion 66 of the collecting portion 65.

[0092] The intermediate member 161 has a three-layer structure, a two-layer structure, or a single-layer structure similar to the intermediate member 61 of the first embodiment. The outer circumferential surface of the intermediate member 161 is bonded to the inner circumferential surface of the downstream collecting portion 66 with an adhesive.

[0093] The flow path forming portion 162 has an inner diameter similar to that of the flow path forming portion 62 of the first embodiment.

[0094] The collective joint 145 is installed in a through hole H provided in the floor slab S of the building, and the gap between the through hole H and the collective joint 145 is filled with mortar M. The intermediate member 161 of the collective joint 145 overlaps the vertical position of the floor slab S. The axial length of the intermediate member 161 may be less than the thickness of the floor slab S or may be greater than or equal to the thickness of the floor slab S. When the axial length of the intermediate member 161 is less than the thickness of the floor slab S, it is preferable that the entire axial length overlaps the vertical position of the floor slab S. When the axial length of the intermediate member 161 is greater than or equal to the thickness of the floor slab S, it is preferable that the entire axial length overlaps the vertical position of the floor slab S.

[0095] As described above, in the collecting joint 145 of the fourth embodiment, the inner diameter of the flow path forming portion 162 that forms the drainage flow path of the intermediate member 161 is the same as the inner diameter of the flow path forming portion 62 of the intermediate member 61 of the first embodiment, so it is possible to ensure a sufficient flow path cross-sectional area of ​​the flow path forming portion 162, which prevents the flow path forming portion 162 from being sealed by drainage, suppresses the generation of negative pressure, and prevents the collecting joint 145 from becoming excessively large, making it possible to achieve space savings, for example.

[0096] In the collecting joint 145 of the fourth embodiment, the collecting downstream section 66 at the lower end of the collecting section 65 is a spigot that is inserted into the connecting section 155 of the lower connecting pipe 151. Therefore, in this collecting joint 145, the collecting section 65 and the lower connecting pipe 151 can be easily connected. Also, in this collecting joint 145, the intermediate member 161 is disposed within the collecting section 65, and the entire axial length serves as a flow path forming section 162 that forms a drainage flow path, so the shape of the intermediate member 161 can be simplified to, for example, a cylindrical shape, and therefore it is easy to manufacture.

[0097] In the collective joint 145 of the fourth embodiment, the intermediate member 161 includes a thermally expandable fire-resistant material, so that the spread of fire through the collective joint 145 can be suppressed.

[0098] (Fifth embodiment) Next, a fifth embodiment of the present invention will be described mainly with reference to Fig. 16. Note that the same components as those in the fourth embodiment are given the same reference numerals and their description will be omitted, and differences will be mainly described.

[0099] The collecting joint 165 of the fifth embodiment that constitutes the piping structure 170 has a lower connecting pipe 171 (lower connecting portion) that is partially different from the lower connecting pipe 36. The lower connecting pipe 171 has a connecting portion 175 at its upper end that serves as a spigot into which the collecting downstream portion 66 of the collecting portion 65 is inserted. Therefore, the collecting downstream portion 66 of the collecting portion 65 serves as a socket into which the connecting portion 175 is inserted.

[0100] In the collecting joint 165, the intermediate member 161 overlaps in the axial direction with the collecting downstream section 66 of the collecting section 65, and the entirety is disposed within the collecting downstream section 66. The connecting section 175 of the lower connecting pipe 171 is inserted below the intermediate member 161 in the collecting downstream section 66 of the collecting section 65.

[0101] The intermediate member 161 is disposed between the collecting portion 65 and the lower connecting pipe 171. The intermediate member 161 is fitted into the collecting downstream portion 66 of the collecting portion 65.

[0102] The intermediate member 161 has a three-layer structure, a two-layer structure, or a single-layer structure similar to the intermediate member 61 of the first embodiment. The outer circumferential surface of the intermediate member 161 is bonded to the inner circumferential surface of the downstream collecting portion 66 with an adhesive.

[0103] The flow path forming portion 162 has an inner diameter similar to that of the flow path forming portion 62 of the first embodiment.

[0104] The collective joint 165 is installed in a through hole H provided in the floor slab S of the building, and the gap between the through hole H and the collective joint 165 is filled with mortar M. The intermediate member 161 of the collective joint 165 overlaps the vertical position of the floor slab S. The axial length of the intermediate member 161 may be less than the thickness of the floor slab S or may be greater than or equal to the thickness of the floor slab S. When the axial length of the intermediate member 161 is less than the thickness of the floor slab S, it is preferable that the entire axial length overlaps the vertical position of the floor slab S. When the axial length of the intermediate member 161 is greater than or equal to the thickness of the floor slab S, it is preferable that the entire axial length overlaps the vertical position of the floor slab S.

[0105] As described above, in the collecting joint 165 of the fifth embodiment, the inner diameter of the flow path forming portion 162 that forms the drainage flow path of the intermediate member 161 is the same as the inner diameter of the flow path forming portion 62 of the intermediate member 61 of the first embodiment, so it is possible to ensure a sufficient flow path cross-sectional area of ​​the flow path forming portion 162, which prevents the flow path forming portion 162 from being sealed by drainage, suppresses the generation of negative pressure, and prevents the collecting joint 165 from becoming excessively large, making it possible to save space, for example.

[0106] In the collecting joint 165 of the fifth embodiment, the collecting downstream section 66 at the lower end of the collecting section 65 serves as a socket into which the connecting section 175 of the lower connecting pipe 171 is inserted. Therefore, in this collecting joint 165, the collecting section 65 and the lower connecting pipe 151 can be easily connected. Also, in this collecting joint 165, the intermediate member 161 is disposed within the collecting section 65, and the entire axial length serves as the flow path forming section 162 that forms the drainage flow path, so the shape of the intermediate member 161 can be simplified to, for example, a cylindrical shape, and therefore it is easy to manufacture.

[0107] In the collective joint 165 of the fifth embodiment, the intermediate member 161 includes a thermally expandable fire-resistant material, so that the spread of fire through the collective joint 165 can be suppressed.

[0108] (Sixth embodiment) Next, a sixth embodiment of the present invention will be described with reference to FIG. 17. The same components as those in the previous embodiment are designated by the same reference numerals, and a description thereof will be omitted. Only the differences will be described. 17, the collective joint 55 of this embodiment has an upper connecting pipe 56 instead of the upper connecting pipe 26 in each configuration of the collective joint 25 of the first embodiment. The upper connecting pipe 56 has a shape obtained by rotating the upper connecting pipe 26 by 180° around an axis along the horizontal plane (upside down). The upper connecting pipe 56 has an upper joint body 27, a horizontal pipe connecting portion 28, a locking portion 29, a first swirl vane 30, and vertical ribs 31 and 32.

[0109] When manufacturing the upper connecting pipe 56, the mold 100 is used. The first core 101 is pulled out downward relative to the upper connecting pipe 56. The second core 102 is pulled out upward relative to the upper connecting pipe 56. The third core 103 is pulled out radially outward relative to the upper connecting pipe 56. The collective joint 55 of this embodiment can also achieve the same effects as the collective joint 25 of the first embodiment.

[0110] Although the first to sixth embodiments of the present invention have been described above in detail with reference to the drawings, the specific configurations are not limited to these embodiments, and the present invention also includes modifications, combinations, deletions, etc. of the configurations within the scope of the gist of the present invention. Furthermore, it goes without saying that the configurations shown in each embodiment can be used in appropriate combinations.

[0111] For example, first swirl vane 30 does not have to be positioned so as to overlap opening 28a of horizontal pipe connection portion 28 in the direction of first axis O1, and the upper end of first swirl vane 30 may be positioned below the lower end of opening 28a of horizontal pipe connection portion 28. In this case, because recess 27c is positioned below horizontal pipe connection portion 28 in the direction of first axis O1, recess 27c will be located in the floor slab penetration hole, and there is a risk that recess 27c will not be filled with mortar when applying mortar to fill the gap between collective joint 25 and the floor slab penetration hole. Therefore, it is not necessary to provide a recess 27c on the outer surface of the upper joint body 27, and the recess 27c may be filled with a filler such as fireproof putty containing a thermally expandable fireproof material or a vibration-damping material that has a vibration-preventing effect, so that there is no concave portion on the outer peripheral surface of the upper joint body 27, or the outer peripheral surface of the upper joint body 27 including the recess 27c may be covered with a sound-insulating cover beforehand before being placed in the floor slab penetration hole.

[0112] Furthermore, the upper connecting pipe 26 and the lower connecting pipe 36 may have an outer layer made of a fiber mortar layer on the outer peripheral surface thereof. Furthermore, in order to suppress drainage noise and vibration of the upper joint body 27 that occur when the drainage water hits the first swirl vane 30 provided on the upper joint body 27, it is preferable to provide a vibration-damping material (not shown) on the outer surface of the upper joint body 27. Examples of the vibration-damping material include rubber such as butyl rubber and elastomer, and the vibration-damping material may be molded into a sheet shape that can be wrapped around the outer peripheral surface of the upper joint body 27, or may be in the form of putty. The vibration-damping material may be provided on the outer peripheral surface of the upper joint body 27 below the horizontal pipe connecting portion 28, or on the side of the upper joint body 27 where the horizontal pipe connecting portion 28 is not provided, such as in the recess 27c. [Explanation of symbols]

[0113] 10 Vertical pipe 15 Vertical pipe 20 horizontal pipe 25, 25A~25C, 55, 105, 125, 145, 165 joints 36,151,171 Lower connecting pipe (lower connecting part) 61,111,131,161 Intermediate parts 62,114,162 Flow path forming section 65 Gathering area 112 Upper receiving port 113 Lower Socket 133 Lower spigot (flow path forming part) F flow path H through hole S floor slab

Claims

1. A collective joint to be installed in a through hole provided in a floor slab of a building, a collecting section having a vertical pipe connecting section connected to a vertical pipe extending from an upper floor and a horizontal pipe connecting section connected to a horizontal pipe; a lower connection portion connected to a vertical pipe extending from the lower floor; an intermediate member disposed between the collecting portion and the lower connecting portion to form a drainage flow path; Equipped with A manifold, wherein the inner diameter of a flow path forming portion of the intermediate member that forms the drainage flow path is greater than 125 mm and smaller than 160 mm.

2. The collective joint according to claim 1 , wherein the intermediate member is disposed across the collecting portion and the lower connecting portion, and the entire axial length of the intermediate member forms the flow path forming portion.

3. The assembly joint according to claim 1 , wherein an upper end of the intermediate member forms a socket into which the assembly portion is inserted.

4. The assembly joint according to claim 3 , wherein the intermediate member has a lower end portion that forms a socket into which the lower connecting portion is inserted.

5. The assembly joint according to claim 3 , wherein the intermediate member has a lower end formed as a spigot into which the lower connecting portion is inserted.

6. 2. The assembly joint according to claim 1, wherein a lower end of the assembly portion is a spigot that is inserted into the lower connection portion, the intermediate member is disposed within the assembly portion, and the entire axial length of the intermediate member forms the flow path forming portion.

7. 2. The assembly joint according to claim 1, wherein a lower end of the assembly portion forms a receiving port into which the lower connection portion is inserted, and the intermediate member is disposed within the assembly portion, with the entire axial length thereof forming the flow path forming portion.

8. The assembly joint according to claim 1 , wherein the intermediate member comprises a thermally expandable refractory material.

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