Collective joint

Abstract

This collective joint is provided with: a joint body which has an axis disposed along the vertical direction; a blade unit which has a blade support part disposed on the inner circumferential surface of the joint body, and a turning blade protruding radially inward from the blade support part; and a vibration reduction part which is provided at least to the blade support part and reduces the vibration of the blade support part.

Description

Cluster joint

[0001] This application claims priority to Japanese Patent Application No. 2024-057121 filed on March 29, 2024, and Japanese Patent Application No. 2024-125232 filed on July 31, 2024, the contents of which are incorporated herein by reference.

[0002] In the past, in order to provide a swirl vane in a collective joint, it has been known to construct the collective joint by fitting a joint body and a blade unit that are individually formed together (see, for example, Patent Document 1). The blade unit has a vertical pipe connection portion, a protrusion, a blade support portion, and a swirl vane.

[0003] The lower end of the vertical pipe connection part is fitted onto the inner circumferential surface of the upper end of the joint body. The protrusion part is provided on the inner circumferential surface of the lower end of the vertical pipe connection part so as to protrude radially inward. The blade support part extends downward from the lower end of the vertical pipe connection part. The swirl blades are provided on the inner circumferential surface of the blade support part so as to protrude radially inward. The lower end of the vertical pipe is placed within the vertical pipe connection part. At this time, the vertical pipe is engaged with the protrusion part from above the protrusion part via a gasket.

[0004] The wastewater (liquid) that flows out of the drainage equipment flows through the vertical pipe into the manifold joint. The wastewater hits the swirl vanes and flows downward inside the joint body while swirling around the axis.

[0005] Japanese Patent Application Publication No. 2019-112869

[0006] In conventional manifolds, the manifold body and the vertical pipe connection part of the impeller unit are fixed to each other by adhesive bonding. In this case, the swirl vanes, which are mainly hit by the wastewater in the manifold, are relatively far from the fixed vertical pipe connection part. This can increase the noise generated by the swirl vanes.

[0007] The present invention has been made in consideration of the above problems, and has an object to provide a mass joint that reduces noise generated by liquid.

[0008] In order to solve the above problems, the present invention proposes the following means: (1) Aspect 1 of the present invention is a collective joint comprising: a joint body arranged so that its axis is along the vertical direction, a blade support part arranged on the inner peripheral surface of the joint body, a blade unit having swirl blades protruding radially inward from the blade support part, and a vibration reduction part provided at least on the blade support part to reduce vibration of the blade support part.

[0009] In this invention, for example, liquid flowing into the coupling body through a vertical pipe connected to the coupling body hits the swirl vanes. This allows the liquid to flow downward within the coupling body while being swirled around the axis by the swirl vanes. At this time, a vibration damping unit provided at least on the blade support portion reduces vibration of the blade support portion. Because the vibration damping unit is provided on the blade support portion closer to the swirl vanes than the vertical pipe connection portion of Patent Document 1, it is possible to more effectively reduce vibration of the swirl vanes, which is the primary source of noise, and thus reduce noise generated by the liquid.

[0010] (2) Aspect 2 of the present invention may be the collective joint described in (1), in which the vibration reducing portions are provided on the joint body and the blade support portion, and the joint body and the blade support portion are fixed to each other by a press fit. In this invention, the vibration reducing portions provided on the joint body and the blade support portion enable the joint body and the blade support portion to be fixed to each other by a press fit.

[0011] (3) Aspect 3 of the present invention may be the collective joint described in (2), in which the vibration reduction part fixes the joint body and the blade support part to each other by the interference fit in the radial direction. In this invention, the vibration reduction part can fix the joint body and the blade support part to each other by the interference fit in the radial direction.

[0012] (4) A fourth aspect of the present invention may be the collective joint described in (2), in which the vibration reduction part fixes the joint body and the blade support part to each other by the interference fit in the axial direction. In this invention, the vibration reduction part can fix the joint body and the blade support part to each other by the interference fit in the axial direction.

[0013] (5) Aspect 5 of the present invention may be the collective joint described in any one of (2) to (4), in which the swirl vane is arranged at an end of the blade support part in the axial direction, the blade unit has a second blade support part arranged on the opposite side of the blade support part in the axial direction with the swirl vane sandwiched between them, and a second vibration reducing part is provided that fixes the joint body and the second blade support part to each other by at least one of adhesive bonding, fitting, and interference fitting. In this invention, the swirl vane, which mainly generates noise, can be more reliably fixed to the joint body by the second blade support part that is fixed to the joint body by at least one of adhesive bonding, fitting, and interference fitting in addition to the blade support part.

[0014] (6) A sixth aspect of the present invention may be the collective joint according to (5), further comprising a second reinforcing portion connected to the swirl vane and the second blade support portion, respectively. In this invention, the second reinforcing portion can more reliably connect the swirl vane and the second blade support portion to each other.

[0015] (7) Aspect 7 of the present invention may be the collective joint according to (6), in which the second reinforcing portion is formed in a plate shape with its thickness direction along the circumferential direction. In this invention, for example, when the volume of the second reinforcing portion is constant, it is possible to efficiently suppress deformation of the swirl vane in the axial direction relative to the second blade support portion.

[0016] (8) Aspect 8 of the present invention may be the collective joint described in (1), in which the vibration reduction section is provided at the blade support section and reinforces the blade support section. In this invention, the vibration reduction section that reinforces the blade support section is provided at the blade support section closer to the swirl vanes than the vertical pipe connection section of Patent Document 1. This makes it possible to further suppress vibrations of the blade support section that supports the swirl vanes, which is where noise mainly occurs, and reduce noise generated by the liquid.

[0017] (9) A ninth aspect of the present invention may be the collective joint described in (8), in which the blade unit has a body connecting portion connected to an end of the blade support portion and attachable to the joint body, and the vibration reducing portion protrudes in the circumferential direction from the circumferential end of the blade support portion so as to be spaced apart from the blade support portion and is connected to the body connecting portion. In this invention, the body connecting portion can be attached to the joint body together with the blade support portion and the swirl vanes. The blade support portion can then be reinforced by the vibration reducing portion so as not to interfere with the flow of liquid through the joint body.

[0018] (10) A tenth aspect of the present invention may be the collective joint according to (9), in which two vibration reduction portions are provided, and the two vibration reduction portions each protrude in the circumferential direction from an end of the blade support portion in the circumferential direction. In this invention, the blade support portion can be reinforced more efficiently by the two vibration reduction portions.

[0019] (11) Aspect 11 of the present invention may be the collective joint described in (9), in which the outer edge of the vibration reduction portion is formed in an arc shape when viewed in the radial direction facing the vibration reduction portion. In this invention, for example, when an external force due to a liquid acts on the swirl vane, it is possible to suppress concentration of stress due to the external force on the vibration reduction portions connected to the blade support portion and the main body connection portion, respectively.

[0020] The group joint of the present invention can reduce noise generated by liquid.

[0021] FIG. 1 is a cross-sectional front view of a main part of a piping structure in which a group joint of a first embodiment of the present invention is used. FIG. 1 is a cross-sectional front view of a main part of a group joint of a first modified example of the first embodiment of the present invention. FIG. 1 is a cross-sectional front view of a main part of a group joint of a second modified example of the first embodiment of the present invention. FIG. 1 is a cross-sectional front view of a main part of a group joint of a third modified example of the first embodiment of the present invention. FIG. 1 is a cross-sectional front view of a main part of a group joint of a fourth modified example of the first embodiment of the present invention. FIG. 2 is a perspective view of a main part of a group joint of a second embodiment of the present invention. FIG. 3 is a perspective view of a main part of a group joint of a first modified example of the second embodiment of the present invention. FIG. 4 is a cross-sectional front view of a main part of a group joint of a third embodiment of the present invention. FIG. 5 is a cutaway perspective view of a main part of the group joint. FIG. 6 is a cutaway perspective view of a unit body of the group joint, as viewed from a predetermined direction. FIG. 7 is a cutaway perspective view of the unit body of the group joint, as viewed from another direction. FIG. 8 is a cutaway perspective view of a unit body of a group joint of a first modified example of the third embodiment of the present invention. 21. A cross-sectional view taken along the cutting line A1-A1 in FIG. 14. A side view of a unit body of a collective joint in a third modified example of the third embodiment of the present invention. A cross-sectional view of a portion of a floor structure provided with a collective joint according to a fourth embodiment of the present invention. A cross-sectional view of the floor structure of FIG. 17 cut along the plane of the paper, looking at the back side. A cross-sectional view of the floor structure of FIG. 17 cut along the plane of the paper, looking at the front side. A cross-sectional view of the joint body of FIG. 19 cut along line A11-A11. A front view of a unit body provided with a collective joint according to a fourth embodiment. A perspective view of the unit body of FIG. 21 from the rear. A perspective view of the unit body of FIG. 21 cut along line A12-A12. A perspective view of the unit body of FIG. 21 cut along line A13-A13. A cross-sectional view of the upper connecting pipe and horizontal pipe connecting portion of FIG. 19. A cross-sectional view of the upper connecting pipe and horizontal pipe connecting portion of FIG. 18. A perspective view of an intermediate pipe according to a fourth embodiment. A perspective view of the intermediate pipe of FIG. 27 cut along line A16-A16. Fig. 10 is a partially cutaway perspective view of an intermediate pipe of Modification 1. Fig. 11 is a partially cutaway perspective view of an intermediate pipe of Modification 2. Fig. 12 is a front view showing a lower connecting pipe provided in a manifold according to a fourth embodiment.32. A cross-sectional view of the lower connecting pipe of FIG. 31 broken along the axis. A bottom view of the lower connecting pipe of FIG. 31 as seen from arrow A19. A side view of the third swirl vane of FIG. 32. A cross-sectional view showing a collective joint according to a fourth embodiment installed on a 150 mm thick floor slab by floating-branch construction. A cross-sectional view showing a collective joint according to a fourth embodiment installed on a 150 mm thick floor slab by normal construction. A cross-sectional view showing a collective joint according to a fourth embodiment installed on a 100 mm thick floor slab by floating-branch construction. A cross-sectional view showing a collective joint according to a fourth embodiment installed on a 100 mm thick floor slab by normal construction. A cross-sectional view showing a collective joint according to a fourth embodiment installed on a 75 mm thick floor slab by floating-branch construction. A cross-sectional view showing a collective joint according to a fourth embodiment installed on a 75 mm thick floor slab by normal construction. A side view of a collective joint according to a fourth embodiment equipped with a fireproof sheet. A side view of a collective joint equipped with the fireproof sheet of Modification 1. A cross-sectional view showing a collective joint equipped with blade units according to a fifth embodiment of the present invention. Fig. 44 is a cross-sectional view showing the unit body of Fig. 43. Fig. 44 is a perspective view of the unit body of Fig. 44 seen from below. Fig. 44 is a side view of the unit body of Fig. 44. Fig. 44 is a perspective view of the unit body of Fig. 44 seen from above. Fig. 44 is a cross-sectional view showing a collective joint equipped with fire-resistant pipes according to a sixth embodiment of the present invention. Fig. 44 is a cross-sectional view showing a state in which a lower connecting pipe is connected to an upper connecting pipe as a collective joint according to a seventh embodiment of the present invention and fire-resistant material is provided. Fig. 45 is a cross-sectional view showing a building equipped with a collective joint according to an eighth embodiment of the present invention, as viewed from the front.

[0022] First Embodiment A piping structure in which a first embodiment of a collective joint according to the present invention is used will be described below with reference to FIGS. 1 to 4. Note that in FIG. 2 and subsequent figures, the configuration other than the main parts of the collective joint may be shown simplified or slightly different. As shown in FIG. 1, this piping structure 1 includes a first vertical pipe 10, a second vertical pipe (not shown), a horizontal pipe 20, and a collective joint 120 of this embodiment. Note that in FIG. 1, the first vertical pipe 10 and the horizontal pipe 20 are indicated by two-dot chain lines. Furthermore, in FIG. 1, the shape of a unit body 122 (described later) in its natural state when no external force is acting on it is indicated by two-dot chain lines.

[0023] The first vertical pipe 10, the second vertical pipe, and the horizontal pipe 20 are formed into a tubular shape using a material such as vinyl chloride resin. The first vertical pipe 10 and the second vertical pipe extend in the vertical direction. Here, "A extends along B" means that the angle between A and B is 30 degrees or less. It is more preferable that this angle be 15 degrees or less. The first vertical pipe 10 is disposed above the second vertical pipe.

[0024] In this specification, the term "vertical direction" merely refers to a direction that serves as a convenient reference for explaining the shapes of each portion and component of the collective joint of the present invention. The term "vertical direction" refers to the vertical direction when the collective joint of the present invention is used in a normal manner, but does not limit the direction when the collective joint of the present invention is used.

[0025] The upper end of the first vertical pipe 10 is connected to the lower end of the collecting joint 120 on the upper floor. The lower end of the second vertical pipe is connected to the upper end of the collecting joint 120 on the lower floor or to a leg joint (not shown). The horizontal pipe 20 is arranged along a horizontal plane with a water gradient. A drainage facility is connected to a first end of the horizontal pipe 20.

[0026] The joint assembly 120 includes a joint body 26, a horizontal pipe connection portion 47, and a blade unit 121. Here, the joint body 26 and the blade unit 121 are formed in a cylindrical shape. The central axes of the joint body 26 and the blade unit 121 are arranged coaxially with a common axis. Hereinafter, the common axis will be referred to as the axis O1. The direction along the axis O1 will be referred to as the axis O1 direction. The direction perpendicular to the axis O1 will be referred to as the radial direction, and the direction going around the axis O1 will be referred to as the circumferential direction.

[0027] The joint body 26 includes an upper joint body 27, a connecting pipe 37, and a lower joint body (not shown). The upper joint body 27 includes an upper body 28, a locking portion 29, a vertical rib 30, and a horizontal rib 31. The upper body 28 is cylindrical and disposed on the axis O1. An opening (reference numeral omitted) penetrating the peripheral wall of the upper body 28 is formed in the vertical middle of the upper body 28. The number of openings formed in the upper body 28 is not limited. In this embodiment, the upper body 28 of the joint body 26 is formed by injection molding, and therefore the inner peripheral surface 28c of the upper body 28 is inclined with respect to the axis O1. Specifically, the inner peripheral surface 28c is inclined so as to gradually approach the axis O1 as it extends downward. Here, the angle between the axis O1 and the inner peripheral surface 28c in a cross section taken along a plane including the axis O1 is defined as θ1. For example, the angle θ1 is 1°.

[0028] The locking portion 29 is provided at the upper end of a portion of the inner circumferential surface of the upper main body 28 that is below the opening. The locking portion 29 is formed in an annular shape and protrudes radially inward from the upper main body 28. A surface 29a of the locking portion 29 that faces radially inward is inclined so as to gradually approach the axis O1 as it extends downward.

[0029] The vertical ribs 30 are provided on the inner peripheral surface of the upper body 28 and extend in the vertical direction. The vertical ribs 30 are formed in a range corresponding to the opening and the locking portion 29 in the vertical direction. The horizontal ribs 31 are provided on the outer peripheral surface of the upper body 28 in a portion above the opening. The horizontal ribs 31 extend in the circumferential direction. For example, the horizontal ribs 31 are provided to hold the upper body 28. An annular sealing member 32 is arranged in a portion of the upper body 28 below the locking portion 29. The sealing member 32 is engaged with the locking portion 29 from below the locking portion 29.

[0030] The connecting pipe 37 is formed in a cylindrical shape and is disposed on the axis O1. The connecting pipe 37 is preferably made of a polyvinyl chloride resin, and preferably contains a resin composition containing a polyvinyl chloride resin and thermally expandable graphite. That is, the connecting pipe 37 is manufactured by molding the resin composition. Typically, the connecting pipe 37 is manufactured by extrusion molding or injection molding the resin composition. The connecting pipe 37 may have a single-layer structure in which the entire connecting pipe 37 is made of the resin composition, or a multi-layer structure consisting of multiple layers. In the case of a multi-layer structure, it is sufficient that any one of the layers is formed from the resin composition. For example, when the connecting pipe 37 has a three-layer structure consisting of a surface layer, an intermediate layer, and an inner layer, the intermediate layer may be formed from a resin composition, and the surface layer, intermediate layer, and inner layer may contain a heat-absorbing agent. In addition, if the connecting pipe 37 does not contain thermally expandable graphite, a sheet-like fire-resistant material containing thermally expandable graphite may be wrapped around the outer surface of the connecting pipe 37 or the outer surface of the sound-insulating material covering the connecting pipe 37, and the fire-resistant material may be embedded in a slab penetration hole in the floor slab (not shown).

[0031] As an example, a single-layer structure can be employed, which is made of a resin composition containing 1 to 20 parts by weight of thermally expandable graphite per 100 parts by weight of polyvinyl chloride resin. Alternatively, a three-layer structure can be employed, which is made of a thermally expandable fire-resistant layer made of a resin composition containing 1 to 20 parts by weight of thermally expandable graphite per 100 parts by weight of polyvinyl chloride resin, and coating layers of a polyvinyl chloride resin composition that does not contain thermally expandable graphite that cover the inner and outer surfaces of the thermally expandable fire-resistant layer.

[0032] If the connecting pipe 37 has a single-layer structure, if the amount of thermally expandable graphite is less than 1 part by weight, sufficient thermal expansion may not be obtained during combustion, and the desired fire resistance may not be achieved.If the amount exceeds 20 parts by weight, the graphite may expand too much when heated, and may not be able to maintain its shape, causing residue to fall out of the slab through-hole, resulting in a decrease in fire resistance.

[0033] When the connecting pipe 37 has a multilayer structure, the resin composition containing the thermally expandable fire-resistant material is not particularly limited, but is preferably one containing 1 to 20 parts by weight of thermally expandable graphite per 100 parts by weight of polyvinyl chloride resin. The thermally expandable graphite content is more preferably 4 to 18 parts by weight, and even more preferably 6 to 16 parts by weight. Furthermore, if the connecting pipe 37 is present throughout the slab penetration hole, even if the thermally expandable graphite content is relatively high (15 parts by weight or more) and the residue is brittle, the residue will block the entire slab penetration hole, retaining the residue after thermal expansion within the floor slab and making it less likely to fall off. For this reason, the axial length of the connecting pipe 37 is set to 100 mm or more, preferably 140 mm or more, and most preferably 160 mm or more.

[0034] When the intermediate layer contains thermally expandable graphite, the intermediate layer is black. Therefore, it is preferable that the surface layer and the inner layer contain a colorant other than black to make them distinguishable from the intermediate layer. The thicknesses of the surface layer and the inner layer are preferably 0.3 mm to 3.0 mm, and more preferably 0.6 mm to 1.5 mm. A coating layer thickness of 0.3 mm or more ensures sufficient mechanical strength as a pipe, while a thickness of 3.0 mm or less suppresses a decrease in fire resistance. Furthermore, it is preferable that the connecting pipe 37 meets the performance requirements specified in JIS K6741. That is, if the thermally expandable graphite content is less than 1 part by weight, sufficient thermal expansion may not be achieved during combustion, and the desired fire resistance may not be achieved. If the thermally expandable graphite content exceeds 20 parts by weight, the graphite may expand too much upon heating, failing to maintain its shape, causing residue to fall out of the slab through-holes, resulting in a decrease in fire resistance.

[0035] The thermally expandable graphite used in this embodiment may be, for example, a crystalline compound obtained by treating powder of natural flaky graphite, pyrolytic graphite, kish graphite, or the like with an inorganic acid and a strong oxidizing agent to insert the inorganic acid between the graphite layers, followed by pH adjustment. Examples of inorganic acids that can be used include concentrated sulfuric acid, nitric acid, and selenic acid. Examples of strong oxidizing agents that can be used include concentrated nitric acid, perchloric acid, perchlorates, permanganates, dichromates, and hydrogen peroxide.

[0036] By adjusting the pH, it is possible to use thermally expandable graphite which is a crystalline compound that maintains the layered structure of carbon and whose pH is adjusted to 1.5 to 7.0, and thermally expandable graphite whose 1.3-fold expansion temperature is 180°C to 280°C.

[0037] If the pH of the thermally expandable graphite is less than 1.5, the acidity is too strong and it is likely to cause corrosion of the molding device, and if the pH exceeds 7.0, the effect of promoting the carbonization of the polyvinyl chloride resin will be weakened, and sufficient fire resistance may not be obtained. The particle size of the thermally expandable graphite is not particularly limited, but it can be, for example, in the range of 100 to 400 μm, preferably 120 to 350 μm.

[0038] The resin composition constituting the connecting pipe 37 may contain additives such as stabilizers, inorganic fillers, flame retardants, lubricants, processing aids, impact modifiers, heat resistance improvers, antioxidants, light stabilizers, ultraviolet absorbers, pigments, plasticizers, thermoplastic elastomers, etc., as needed, within the scope that does not impair the purpose of this embodiment.

[0039] The upper end of the connecting pipe 37 is disposed within the lower end of the upper body 28 of the upper joint body 27. The connecting pipe 37 is engaged with the engaging portion 29 of the upper body 28 from below the engaging portion 29 via a sealing member 32. The connecting pipe 37 protrudes downward from the upper body 28. The connecting pipe 37 is fixed to the upper body 28 with an adhesive or the like.

[0040] The lower joint body is formed in a cylindrical shape. The lower joint body is made of vinyl chloride resin or the like. The lower end of the connecting pipe 37 is disposed within the upper end of the lower joint body. The connecting pipe 37 is fixed to the lower joint body with adhesive or the like. The joint body 26 configured as described above is disposed so that its own axis O1 is aligned in the vertical direction.

[0041] The horizontal pipe connecting portion 47 is formed in a cylindrical shape. The horizontal pipe connecting portion 47 is disposed so that its axis O2 is along a horizontal plane. The horizontal pipe connecting portion 47 is connected to the peripheral edge of the opening in the upper body 28. The upper joint body 27 and the horizontal pipe connecting portion 47 are integrally formed from polyvinyl chloride resin or the like.

[0042] The blade unit 121 is fitted to the upper end of the joint body 26. The blade unit 121 has a unit body 122, a seal member 62, and a pressing member (not shown). The unit body 122 has an upper vertical pipe connecting portion (main body connecting portion) 53, a protruding portion 54, a blade support portion (first blade support portion) 55, and a swirl blade 56.

[0043] The upper vertical pipe connecting portion 53 has a large diameter portion (reference numeral omitted) and a small diameter portion (reference numeral omitted). The large diameter portion and the small diameter portion are each formed in a cylindrical shape and are arranged on the axis O1. The inner diameter and outer diameter of the large diameter portion are approximately the same as the inner diameter and outer diameter of the upper body 28 of the upper joint body 27, respectively. The outer diameter of the small diameter portion is approximately the same as the inner diameter of the upper body 28 of the upper joint body 27. The small diameter portion is fixed to the inner circumferential surface of the lower end of the large diameter portion. The small diameter portion protrudes downward from the large diameter portion. The small diameter portion is fitted to the inner circumferential surface of the upper end of the upper joint body 27 of the joint body 26. As described above, the upper vertical pipe connecting portion 53 is attached to the joint body 26 with an adhesive.

[0044] The protrusion 54 is provided on the inner circumferential surface of the lower end of the small diameter portion of the upper vertical pipe connecting portion 53 so as to protrude radially inward. The protrusion 54 is formed in an annular shape and is formed around the entire circumference of the small diameter portion. Note that the protrusion 54 may be formed on only a portion of the circumference. The blade support portion 55 extends downward from a portion of the circumference of the lower end of the small diameter portion of the upper vertical pipe connecting portion 53. In other words, the upper vertical pipe connecting portion 53 is connected to the upper end of the blade support portion 55. The blade support portion 55 is formed in a curved flat plate shape and is formed in an arc shape when viewed in the vertical direction. The blade support portion 55 extends in the vertical direction. In other words, the circumferential length of the blade support portion 55 is approximately constant regardless of the position in the vertical direction.

[0045] The lower end of the blade support portion 55 extends gradually downward toward a first circumferential side (hereinafter simply referred to as the first side) D1. Hereinafter, the side opposite to the first side D1 in the circumferential direction will be referred to as a second circumferential side (hereinafter simply referred to as the second side) D2.

[0046] The swirl vanes 56 are formed, for example, in the shape of a curved plate and are provided on the inner peripheral surface (surface facing radially inward) of the lower end of the blade support portion 55. The swirl vanes 56 protrude radially inward from the blade support portion 55. The upper surface of the swirl vanes 56 is gradually inclined downward as it approaches the first side D1. The upper vertical pipe connection portion 53, the protrusion portion 54, the blade support portion 55, and the swirl vanes 56 of the unit body 122 are integrally formed from polyvinyl chloride resin or the like.

[0047] In this embodiment, since the unit body 122 is formed by injection molding, in a natural state, the outer peripheral surface 55c of the blade support portion 55 is inclined with respect to the axis O1. Specifically, the outer peripheral surface 55c is inclined so as to gradually approach the axis O1 as it extends downward. Here, in a cross section taken along a plane including the axis O1, the angle formed between the axis O1 and the outer peripheral surface 55c is defined as θ2. For example, the angle θ2 is equal to or less than 1° and equal to or less than the angle θ1.

[0048] For example, when the upper vertical pipe connection portion 53 is attached to the joint body 26, the upper body 28 presses radially inward against the blade support portion 55, causing the blade support portion 55 to deform as shown by the solid line. The upper body 28 and the blade support portion 55, which press against each other radially, form a vibration reduction portion (fixing portion) 124. The vibration reduction portion here refers to a configuration that reduces the vibration of the swirl blades compared to the bonding between the joint body and the vertical pipe connection portion of the blade unit in Patent Document 1. The vibration reduction portion 124 is provided on the upper body 28 (joint body 26) and the blade support portion 55, and fixes the upper body 28 and the blade support portion 55 to each other by radial interference fit. The interference fit used in this specification refers to a fit that has a portion (slot) reserved for tight tightening. The vibration reduction portion 124 reduces the vibration of the blade support portion 55.

[0049] The configuration of the seal member 62 is not limited. The seal member 62 is formed in a cylindrical shape and is disposed coaxially with the axis O1 on the radially inner side of the upper vertical pipe connecting portion 53. The seal member 62 engages with the protruding portion 54 from above the protruding portion 54. The seal member 62 is made of synthetic rubber or the like. The pressing member is formed in an annular shape and is disposed coaxially with the axis O1. The pressing member is fitted into the large diameter portion of the upper vertical pipe connecting portion 53. Note that the blade unit 121 does not necessarily have to have the seal member 62 and the pressing member.

[0050] The lower end of the first vertical pipe 10 is disposed within the seal member 62, the presser member, and the upper vertical pipe connecting portion 53 of the blade unit 121. The lower end of the first vertical pipe 10 is engaged with the protruding portion 54 of the unit body 122 from above the protruding portion 54 via the seal member 62. The upper end of the second vertical pipe is disposed within the lower end of the lower joint body of the joint body 26. The second end of the horizontal pipe 20, which is opposite to the first end, is disposed within the horizontal pipe connecting portion 47 of the manifold joint 25.

[0051] As described above, in the manifold joint 120 of this embodiment, for example, wastewater flowing into the joint body 26 through the first vertical pipe 10 connected to the joint body 26 hits the swirl vanes 56. This allows the wastewater to flow downward within the joint body 26 while being swirled around the axis O1 by the swirl vanes 56. This wastewater flows through the second vertical pipe and is treated in a wastewater treatment facility. During this process, the vibration damping units 124 provided on the upper body 28 and the blade support units 55 dampen vibrations of the blade support units 55. The vibration damping units 124 are provided on the blade support units 55, which are closer to the swirl vanes 56 than the vertical pipe connection units of Patent Document 1. This more effectively damps vibrations of the swirl vanes 56, which are the primary source of noise, thereby reducing noise caused by the wastewater.

[0052] The vibration reducing portions 124 are provided on the upper body 28 and the blade support portions 55, and fix the upper body 28 and the blade support portions 55 to each other by a shrink fit. Therefore, the vibration reducing portions 124 provided on the upper body 28 and the blade support portions 55 can fix the upper body 28 and the blade support portions 55 to each other by a shrink fit. The vibration reducing portions 124 are provided on the upper body 28 and the blade support portions 55, and fix the upper body 28 and the blade support portions 55 to each other by a shrink fit in the radial direction. Therefore, the vibration reducing portions 124 can fix the upper body 28 and the blade support portions 55 to each other by a shrink fit in the radial direction.

[0053] The configuration of the collective joint 120 of this embodiment can be modified in various ways, as described below. As in the collective joint 120A of a first modification shown in FIG. 2 , each configuration of the collective joint 120 of the first embodiment may have a blade unit 131 instead of the blade unit 121. In this first modification, a recess 28d recessed radially outward is formed on the inner circumferential surface of the upper body 28 of the joint body 26. The recess 28d is formed in a range in the up-down direction of the upper body 28 that roughly corresponds to the blade support portion 55. The recess 28d is formed in only a portion of the circumferential direction of the upper body 28. In this first modification and subsequent modifications, the inner circumferential surface 28c of the upper body 28 and the outer circumferential surface 55c of the blade support portion 55 are aligned along the axis O1 (they are not inclined relative to the axis O1).

[0054] Blade unit 131 has a unit body 132 instead of unit body 122 in each configuration of blade unit 121. Unit body 132 has a convex portion 134 in addition to each configuration of unit body 122. Convex portion 134 is provided on the outer peripheral surface of blade support portion 55. In this example, convex portion 134 is provided over substantially the entire length of blade support portion 55 in the vertical direction. The radial length of convex portion 134 in its natural state is equal to or less than the radial length (depth) of recess 28d. The vertical length of convex portion 134 in its natural state is slightly longer than the vertical length of recess 28d.

[0055] Therefore, when the protrusion 134 is pressed into the recess 28d, the protrusion 134 presses against the upper end of the peripheral edge of the opening of the recess 28d in the upper main body 28 from below this upper end. The protrusion 134 and the upper end of the peripheral edge of the opening of the recess 28d in the upper main body 28, which press against each other in the vertical direction (direction of the axis O1), form a vibration reducer 136. Furthermore, the protrusion 134 presses against the lower end of the peripheral edge of the opening of the recess 28d in the upper main body 28 from above this lower end. The protrusion 134 and the lower end of the peripheral edge of the opening of the recess 28d in the upper main body 28, which press against each other in the vertical direction (direction of the axis O1), form a vibration reducer 137. The vibration reducers 136, 137 fix the upper main body 28 (joint main body 26) and the blade support part 55 to each other by vertical (direction of the axis O1) press fit.

[0056] As described above, in the collective joint 120A of the first modified example, the vibration reduction parts 136, 137 secure the upper body 28 and the blade support part 55 to each other by vertical interference fit. This allows the vibration reduction parts 136, 137 to secure the upper body 28 and the blade support part 55 to each other by vertical interference fit. Therefore, it is possible to reduce noise generated by drainage. The recesses 28d and protrusions 134 formed only partially in the circumferential direction allow the unit body 132 to be positioned circumferentially relative to the joint body 26. Note that a recess may be formed on the outer peripheral surface of the blade support part 55, and a protrusion corresponding to this recess may be formed on the upper body 28.

[0057] As in the case of a collective joint 120B of a second modification shown in FIG. 3 , in each configuration of the collective joint 120 of the first embodiment, a unit body 52A of the blade unit 51A may be provided instead of the unit body 122 and the vibration reduction unit 124 of the blade unit 121. The unit body 52A (blade unit 51A) has a second blade support portion (reinforcing plate) 139 in each configuration of the unit body 122. In this modification, the swirl vanes 56 are disposed at the lower end (end in the direction of the axis O1) of the blade support portion 55 within a predetermined range in the circumferential direction. The second blade support portion 139 is formed in a curved flat plate shape and has an arc shape when viewed in the vertical direction. The second blade support portion 139 is disposed on the opposite side (lower side) of the blade support portion 55 in the direction of the axis O1, with the swirl vanes 56 sandwiched between them. The swirl vanes 56 are disposed at the upper end of the second blade support portion 139.

[0058] The lower end of second blade support portion 139 contacts the upper end of surface 29a of locking portion 29 from above the upper end. The upper surface of locking portion 29 may be formed to extend along a horizontal plane. This may make it easier for the lower end of second blade support portion 139 to contact the upper surface of locking portion 29.

[0059] In the second modified example, two vertical ribs 30 provided on the upper main body 28 (joint main body 26) are arranged to sandwich the blade support portion 55 and the second blade support portion 139 in the circumferential direction. In the second modified example, the circumferential lengths of the blade support portion 55 and the second blade support portion 139 in their natural state are slightly longer than the circumferential length between the two vertical ribs 30. Therefore, when the blade support portion 55 and the second blade support portion 139 are arranged between the two vertical ribs 30, the blade support portion 55 and the second blade support portion 139 press against the two vertical ribs 30 from the inside of the two vertical ribs 30. The two vertical ribs 30 and the blade support portions 55, 139 pressing against each other in the circumferential direction form a vibration reduction portion (fixing portion) 141.

[0060] Of the two vertical ribs 30 aligned in the circumferential direction, the vertical rib 30 arranged on the first side D1 is also referred to as the vertical rib 30A, and the vertical rib 30 arranged on the second side D2 is also referred to as the vertical rib 30B. The blade support portion 55 presses against the vertical rib 30A from the second side D2 of the vertical rib 30A. The second blade support portion 139 presses against the vertical rib 30B from the first side D1 of the vertical rib 30B. The vibration reducer 141 fixes the upper main body 28 (joint main body 26) and the blade support portions 55, 139 to each other by circumferential interference fit via the two vertical ribs 30.

[0061] As described above, in the collective joint 120B of the second modified example, the vibration reduction portion 141 secures the upper body 28 and the blade support portions 55, 139 to each other by circumferential interference fit. Therefore, the vibration reduction portion 141 allows the upper body 28 and the blade support portions 55, 139 to be secured to each other by circumferential interference fit. This reduces noise generated by drainage. Note that the blade support portion may be formed by the blade support portion 55 and the second blade support portion 139 as a whole.

[0062] The collective joint 120C of the third modified example shown in Fig. 4 includes an adhesive portion 146 in addition to the components of the collective joint 120A of the first modified example. Note that the swirl vanes 56 are not shown in Fig. 4. In the third modified example, the recesses 28d are not formed in the upper body 28. The protrusions 134 are formed only on the lower end of the outer circumferential surface of the vane support portion 55.

[0063] The adhesive portion 146 is disposed above the protrusion 134 on the outer peripheral surface of the blade support portion 55. A known adhesive for bonding vinyl chloride resin or the like can be used for the adhesive portion 146. The adhesive portion 146 secures the upper body 28 (joint body 26) and the blade support portion 55 to each other by adhesion. Because the overall thickness (radial length) of the blade support portion 55 and the protrusion 134 is thicker than the thickness of the blade support portion 55, the protrusion 134 presses against the upper body 28 from the radially inner side of the upper body 28. The upper body 28 and the protrusion 134 press against each other in the radial direction to form a vibration reduction portion 147. The vibration reduction portion 147 secures the upper body 28 and the blade support portion 55 to each other by radial interference fit. The collective joint 120C of the third modified example includes the adhesive portion 146 and the vibration reduction portion 147 that secure the upper body 28 and the blade support portion 55 to each other.

[0064] In the collective joint 120D of the fourth modification shown in FIG. 5, the blade support portion 55 and the second blade support portion 139 have a shorter overall circumferential length than the collective joint 120B of the second modification, and a notch 139a is formed in the second blade support portion 139. The notch 139a penetrates the second blade support portion 139 in the radial direction and opens downward. The bottom (upper end) of the notch 139a presses against the vertical rib 30B from above the vertical rib 30B, and the two are fixed to each other by a vertical interference fit (direction of the axis O1). The bottom of the notch 139a and the vertical rib 30B form a vibration reduction portion 148. The blade support portion 55 is spaced from the vertical rib 30A toward the second side D2.

[0065] 5, the blade support portion 55 may be pressed against the vertical rib 30A from the second side D2 of the vertical rib 30A. As shown by the two-dot chain line L2, the second blade support portion 139 may be cut out upward from the end of the second side D2 of the bottom of the notch 139a. Even with this configuration, the second blade support portion 139 and the vertical rib 30B can form a vibration reduction portion.

[0066] Second Embodiment Next, a second embodiment of the present invention will be described with reference to Figures 6 and 7. The same components as those in the previous embodiment are designated by the same reference numerals, and their description will be omitted. Only the differences will be described. As shown in Figure 6, a unit body 152 of a blade unit 151 included in a collective joint 150 of this embodiment has an upper vertical pipe connection portion 53, a protrusion 54 (not shown), a blade support portion 55, a swirl blade 56, and two vibration reduction portions 153 and 154. The vibration reduction portions 153 and 154 are formed in a curved, flat plate shape, and are formed in an arc shape when viewed in the vertical direction.

[0067] The vibration reducer 153 protrudes from an end of the first side D1 (circumferential direction) of the blade support portion 55 toward the first side D1 (in the circumferential direction so as to be separated from the blade support portion 55). The vibration reducer 154 protrudes from an end of the second side D2 (circumferential direction) of the blade support portion 55 toward the second side D2 (in the circumferential direction so as to be separated from the blade support portion 55). The vibration reducers 153, 154 are provided on the blade support portion 55. In this embodiment, the circumferential lengths of the vibration reducers 153, 154 gradually increase upward. The vibration reducers 153, 154 are connected to the upper vertical pipe connection portion 53. The vibration reducers 153, 154 reinforce the blade support portion 55.

[0068] As described above, in the collective joint 150 of this embodiment, the vibration reduction sections 153, 154 that reinforce the blade support section 55 are provided on the blade support section 55 that is closer to the swirl blades 56 than the vertical pipe connection section of Patent Document 1. This makes it possible to further suppress the vibration of the blade support section 55 that supports the swirl blades 56, which is the main source of noise, and to reduce the noise generated by drainage.

[0069] The vibration reducer 153 protrudes from the end of the first side D1 of the blade support part 55 toward the first side D1 and is connected to the upper vertical pipe connecting part 53. Therefore, the upper vertical pipe connecting part 53 can be attached to the joint body 26 together with the blade support part 55 and the swirl blade 56. The vibration reducer 153 can reinforce the blade support part 55 so as not to interfere with the drainage flow through the joint body 26. The unit body 152 has two vibration reducers 153, 154. Therefore, the blade support part 55 can be reinforced more efficiently by the two vibration reducers 153, 154.

[0070] The unit body 152 does not necessarily have to have the vibration reduction portion 153 or the vibration reduction portion 154. The vibration reduction portion may protrude from the blade support portion 55 in the radial direction.

[0071] 7, a unit body 152A of a blade unit 151A included in a collective joint 150A of the first modified example has a vibration reduction portion 161 instead of the vibration reduction portion 153 in each configuration of the unit body 152. The vibration reduction portion 161 protrudes toward the first side D1 from the end of the first side D1 of the blade support portion 55. When viewed in the radial direction facing the vibration reduction portion 161, the outer edge of the vibration reduction portion 161 is formed in an arc shape.

[0072] The first modified collective joint 150A configured as described above can prevent stress caused by external forces, such as those due to drainage, from concentrating on the vibration reduction sections 161 connected to the blade support section 55 and the upper vertical pipe connection section 53, when the external forces act on the swirl blades 56.

[0073] Third Embodiment Next, a third embodiment of the present invention will be described with reference to FIGS. 8 to 16. The same components as those in the previous embodiment are designated by the same reference numerals, and their description will be omitted. Only the differences will be described. As shown in FIGS. 8 to 11, the collective joint 165 of this embodiment includes the same components as those in the collective joint 120B of the second modified example of the first embodiment, except that instead of the unit body 52A of the blade unit 51A, the collective joint 165 includes a unit body 167 of the blade unit 166, an adhesive portion (vibration reducing portion) 81, and a second adhesive portion (second vibration reducing portion) 175. The unit body 167 includes reinforcing ribs (second reinforcing portion, reinforcing portion) 168A, 168B in addition to the components of the unit body 52A. The shape of the second reinforcing portion is not limited to a rib shape.

[0074] The reinforcing ribs 168A, 168B are each provided on the inner circumferential surface of the second blade support portion 139 and protrude radially inward from the second blade support portion 139. The reinforcing ribs 168A, 168B extend in the up-down direction. The reinforcing ribs 168A, 168B are spaced apart from each other in the circumferential direction, with the reinforcing rib 168A being located closer to the first side D1 than the reinforcing rib 168B. The reinforcing rib 168A is formed in a plate shape with its thickness direction aligned with the circumferential direction. The reinforcing rib 168B is formed in a plate shape with its thickness direction aligned with the circumferential direction.

[0075] 11 , in this embodiment, a surface 168aA of the reinforcing rib 168A facing radially inward is inclined downward so as to gradually move away from the axis O1. The surface 168aA is flat. The reinforcing ribs 168A and 168B are connected to the swirl vane 56 and the second blade support portion 139, respectively. That is, the upper ends of the reinforcing ribs 168A and 168B are continuous with the swirl vane 56.

[0076] At the connection between the protrusion 54 and the blade support portion 55, a surface 55e facing between the radially inward and downward direction is concave toward the radially outward and upward direction. At the connection between the upper vertical pipe connection portion 53 and the blade support portion 55, a surface 55f is located at the end of the first side D1 and facing between the first side D1 and downward direction, and is concave toward the second side D2 and upward direction. The surfaces 55f and 55e are smoothly connected by a three-dimensional curved surface. At the connection between the upper vertical pipe connection portion 53 and the blade support portion 55, a surface 55g is located at the end of the second side D2 and facing between the second side D2 and downward direction, and is concave toward the first side D1 and upward direction. The surfaces 55g and 55e are smoothly connected by a three-dimensional curved surface.

[0077] As shown in Figure 8, the adhesive portion 81 secures the joint body 26 and the blade support portion 55 to each other by adhesion. The second adhesive portion 175 secures the joint body 26 and the second blade support portion 139 to each other by adhesion. A known adhesive that bonds vinyl chloride resin or the like can be used for the adhesive portions 81, 175. The blade support portions 55, 139 and the joint body 26 may be secured to each other by at least one of adhesion, fitting, and interference fit. The reinforcing rib 168B and the vertical rib 30B press against each other in the vertical direction to form the vibration reduction portion 169.

[0078] As described above, in the collective joint 165 of this embodiment, in addition to the blade support part 55, the second blade support part 139 is fixed to the joint body 26 by adhesive, so that the swirl blades 56, which mainly generate noise, can be fixed to the joint body 26 more reliably.

[0079] The unit body 167 has reinforcing ribs 168A and 168B. The reinforcing ribs 168A and 168B therefore more reliably connect the swirl vane 56 and the second blade support portion 139 to each other. The reinforcing rib 168A is formed in a plate shape with its thickness aligned with the circumferential direction. Therefore, for example, when the volume of the reinforcing rib 168A is kept constant, deformation of the swirl vane 56 in the up-down direction relative to the second blade support portion 139 can be efficiently suppressed.

[0080] The collective joint 165 may be provided with the vibration reducing portion 124, instead of the adhesive portion 81, which secures the joint body 26 and the blade support portion 55 to each other by radial interference fit. The collective joint 165 may be provided with a second vibration reducing portion, instead of the second adhesive portion 175, which secures the joint body 26 and the second blade support portion 139 to each other by radial interference fit. The second vibration reducing portion may have a structure that secures the joint body 26 and the second blade support portion 139 to each other by at least one of adhesion, engagement, and interference fit. The unit body 167 may not have the reinforcing rib 168A.

[0081] 10, the length by which the swirl vanes 56 protrude radially inward may be shortened and the circumferential length of the swirl vanes 56 may be increased, as shown by line L5. In this case, it is preferable to increase the circumferential length of the blade support portions 55 in accordance with the swirl vanes 56. Furthermore, it is preferable to position the lower ends of the vertical ribs 30 above the swirl vanes 56 so that the swirl vanes 56 do not come into contact with the vertical ribs 30.

[0082] 12 and 13 , the connection between the inner circumferential surface of the blade support portion 55 and the upper surface of the swirl vane 56 may have a curved surface 55i that is recessed radially outward and downward. The collective joint 165A does not have the second blade support portion 139 or the reinforcing ribs 168A, 168B in each configuration of the collective joint 165. As described above, the unit body 167A may have the curved surface 55i instead of the reinforcing ribs 168A, 168B to suppress vibration of the swirl vane 56 and the blade support portions 55, 139.

[0083] 14 and 15 , the connection between the inner circumferential surface of the second blade support portion 139 and the lower surface of the swirl vane 56 may have a curved surface 56c that is recessed radially outward and upward. The collective joint 165B does not have the reinforcing ribs 168A, 168B in each configuration of the collective joint 165. As described above, the unit body 167B may have the curved surface 56c instead of the reinforcing ribs 168A, 168B to suppress vibration of the swirl vane 56 and the blade support portions 55, 139.

[0084] As in a collective joint 165C of a third modified example shown in Fig. 16, a surface 168aA facing radially inward in a reinforcing rib 168A may be a curved surface that is concave between the radially outward and upward direction. Similar to the surface 168aA, a surface 168aB facing radially inward in a reinforcing rib 168B may be a curved surface that is concave between the radially outward and upward direction.

[0085] Although the first to third 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 modifications, combinations, deletions, etc. of the configurations are included 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. For example, in the first to third embodiments, the joint body 26 does not need to have the locking portion 29, the vertical rib 30, and the horizontal rib 31.

[0086] The unit body 122 may not have the upper vertical pipe connection portion 53 or the protrusion 54. Although the joint body 26 is described as being composed of three members, namely, the upper joint body 27, the connecting pipe 37, and the lower joint body, the joint body may be composed of one member, two members, or four or more members.

[0087] For example, the joint body 26 may be composed of two members, the upper joint body 27 and the lower joint body 42, without providing the connecting pipe 37. In this case, the lower end of the upper joint body 27 is a socket or spigot, and the upper end of the lower joint body 42 is a spigot or spigot, so that the lower end of the upper joint body 27 and the upper end of the lower joint body 42 can be directly connected to each other. In this case, a sheet-like fire-resistant material containing a thermal expansion material such as thermally expandable graphite may be provided below the horizontal pipe connecting portion 47 of the upper joint body 27 or on the outer surface of the lower body 43 or connecting portion 44 of the lower joint body 42. The width of the sheet-like fire-resistant material in the pipe axial direction of the joint body 26 is 100 mm or more, preferably 140 mm or more, and most preferably 160 mm or more.

[0088] In order to suppress drainage noise that occurs when drainage water hits the swirl vanes 56 provided on the upper body 28 and vibration of the upper body 28 and the swirl vanes 56, it is preferable to provide a vibration-damping material (not shown) on the upper body 28 and the swirl vanes 56. Examples of the vibration-damping material include rubber such as butyl rubber and elastomers, and the vibration-damping material may be molded into a sheet shape that can be wrapped around the outer peripheral surface of the upper body 28, or may be in the form of putty. The vibration-damping material may be provided on the outer peripheral surface of the upper body 28, the lower surface of the swirl vanes 56, the support-side adhesive surface 55a or inner peripheral surface 55b of the blade support portion 55, etc.

[0089] 17 to 19 , a floor structure 201 is used, for example, in a building 400 with multiple floors. The floor structure 201 is used, for example, in a portion where horizontal pipes P3 of each floor in the building 400 are connected. The floor structure 201 includes, for example, a floor slab (floor) S and a joint assembly 210.

[0090] (Floor slab) The floor slab S is a floor that separates the upper floor F1 above the floor slab S from the lower floor F2 below the floor slab S. The upper floor F1 here refers to one floor (layer) of the building 400 that is configured with the floor slab S and is located above the floor slab S. The lower floor F2 refers to one floor of the building 400 that is configured with the floor slab S and is located below the floor slab S.

[0091] The floor slab S includes wooden floors in addition to general slab floors. The thickness T of the floor slab S can be selected arbitrarily from, for example, 75 mm, 100 mm, 150 mm, etc., but is preferably 150 mm or more. Hereinafter, the thickness T of the floor slab S may be referred to as the "slab thickness T." The floor slab S has a through hole H. The through hole H penetrates from the upper floor F1 to the lower floor F2. A collective joint 210 is inserted into the through hole H. The hole diameter of the through hole H is preferably, for example, 210 mm or more and 300 mm or less.

[0092] In the fourth embodiment, a first vertical pipe (vertical pipe) P1 of the upper floor F1 is provided above a through hole H formed in a floor slab S, and a second vertical pipe (vertical pipe) P2 of the lower floor F2 is provided below the through hole H. A horizontal pipe P3 is also provided along the upper floor F1. A collective joint 210 is installed in the floor slab S and inserted into the through hole H. A filler material M is filled between the outer surface of the collective joint 210 and the inner surface of the through hole H.

[0093] (Combined joint) The combined joint 210 is used in the drainage pipe 500 (piping structure). The drainage pipe 500 is provided in the building 400. Here, for example, the outlets of the toilets on each floor (both not shown) are located at a relatively high position relative to the surface of the floor slab S. Therefore, the horizontal pipe P3 needs to be located at a relatively high position relative to the surface of the floor slab S in accordance with the outlets of the toilets. For this reason, the combined joint 210 is installed on the floor slab S by construction in which, while it is placed in the through-hole H, the horizontal pipe connection part 221 (described later) that connects the horizontal pipe P3 is raised a predetermined distance above the floor slab S. Hereinafter, this construction may be referred to as "branch-floating construction."

[0094] In this state, the height H1 from the surface of the floor slab S to the lower end 221a of the outer surface of the horizontal pipe connection portion 221, which will be described later, is preferably 140 mm. Hereinafter, the height H1 from the floor slab S to the lower end 221a of the outer surface of the horizontal pipe connection portion 221 may be referred to as the "height below the branch H1." Furthermore, the lower end 221a of the outer surface of the horizontal pipe connection portion 221 may be referred to as the "lower end 221a of the outer surface."

[0095] In the fourth embodiment, an example in which the collective joint 210 is installed on the floor slab S by floating installation will be mainly described, but the collective joint 210 may also be installed on the floor slab S by normal installation. In the case of normal installation, the collective joint 210 is installed with the outer surface lower end 221a of the horizontal pipe connection portion 221 in close proximity to the floor slab S. Hereinafter, this installation may be referred to as "normal installation." The collective joint 210 includes, for example, a joint body 211, a fireproof material 212, an upper sound-insulating cover 213, a lower sound-insulating cover (sound-insulating cover, first sound-insulating cover) 214, and a fixing tape 215.

[0096] In the fourth embodiment, the collective joint 210 is described as an example of a joint including a joint body 211, a fireproof material 212, an upper sound-insulating cover 213, a lower sound-insulating cover 214, and a fixing tape 215. However, this is not limiting. As another example, the collective joint 210 may not include the upper sound-insulating cover 213 and the lower sound-insulating cover 214. In this case, when the collective joint 210 is housed in the through hole H of the floor slab S, a filler material M is filled between the inner surface of the through hole H and the outer surface of the collective joint 210 (specifically, the vertical pipe connection portion 220 described later). In this state, a portion of a tapered portion 293 described later is embedded in the filler material M, and the tapered portion 93 contacts the filler material M. Furthermore, as described later, a fireproof pipe 360 ​​may be provided instead of the fireproof material 212.

[0097] (Coupling Body) The coupling body 211 includes a vertical pipe connecting portion 220 connectable to the first vertical pipe P1 and the second vertical pipe P2, and a horizontal pipe connecting portion 221 protruding from the side of the vertical pipe connecting portion 220 and connectable to the horizontal pipe P3. The coupling body 211 is a resin coupling component. The overall length of the coupling body 211 is 700 mm. The effective length of the coupling body 211 is 625 mm. The length from the lower end of the horizontal pipe connecting portion 221 to the upper end of the coupling body 211 is 232 mm. The length from the lower end of the horizontal pipe connecting portion 221 to the protrusion 222 of the lower connecting pipe 233 (described below) is 378 mm. The length from the protrusion 222 of the lower connecting pipe 233 to the lower end of the lower connecting pipe 233 is 90 mm. The inner diameter of the vertical pipe connecting portion 220 of the coupling body 211 is 140 mm. The outer diameter (i.e., maximum outer diameter) of the vertical pipe connection part 220 is 180 mm or more and 195 mm or less. The maximum outer diameter of the vertical pipe connection part 220 will be described in detail later. However, the dimensions of various lengths, angles, etc., including the dimensions described later, are not limited to the exemplified dimensions.

[0098] (Vertical Pipe Connection Portion) The vertical pipe connection portion 220 includes an upper connecting pipe 230 connectable to the first vertical pipe P1, a blade unit 231 connected to the upper connecting pipe 230, an intermediate pipe 232 connected to the upper connecting pipe 230, and a lower connecting pipe 233 connected to the intermediate pipe 232 and connectable to the second vertical pipe P2. The vertical pipe connection portion 220 is formed in a cylindrical shape centered on the axis O11. In the following description, the upper connecting pipe 230 side of the vertical pipe connection portion 220 along the axis O11 of the vertical pipe connection portion 220 will be referred to as the upper side, and the lower connecting pipe 233 side will be referred to as the lower side, as appropriate.

[0099] (Horizontal pipe connection portion) As shown in Figures 19 and 20, the horizontal pipe connection portion 221 is disposed above the floor slab S. The horizontal pipe connection portion 221 extends cylindrically from the peripheral wall of the upper connecting pipe 230 in the vertical pipe connection portion 220 toward the outside in the radial direction perpendicular to the axis O11. The horizontal pipe connection portion 221 has a bushing stopper 224. The bushing stopper 224 is provided in an annular shape on the inner surface of the horizontal pipe connection portion 221. The bushing stopper 224 contacts the tip of a horizontal bush 225, which will be described later.

[0100] Three horizontal pipe connecting portions 221 are arranged circumferentially around the vertical pipe connecting portion 220. Two of the three horizontal pipe connecting portions 221 are arranged at positions radially sandwiching the axis O11. The remaining horizontal pipe connecting portion 221 extends in a radial direction perpendicular to the axis O11, in a direction that forms an angle of 90° in plan view with the directions in which the two horizontal pipe connecting portions 221 extend. Each horizontal pipe connecting portion 221 has an opening 226 that opens to the inner surface of the vertical pipe connecting portion 220. In this embodiment, the opening 226 is an opening of the bushing stopper 224 inside the upper connecting pipe 230 as viewed from the axis O11, but is not limited thereto. For example, if the bushing stopper 224 is not included in the horizontal pipe connecting portion 221, the opening 226 may be an opening formed by the end of the horizontal pipe connecting portion 221 that opens to the vertical pipe connecting portion 220. The opening 226 is, for example, a circular opening centered on the axis O12 of the horizontal pipe connecting portion 221.

[0101] A horizontal bushing (bush) 225, a horizontal packing 227, and a horizontal ring 228 are provided at the tip of the horizontal pipe connecting portion 221 that connects the horizontal pipe P3. The number and extending direction of the horizontal pipe connecting portions 221 are not limited to this embodiment and can be changed as desired. For example, the number of horizontal pipe connecting portions 221 does not have to be two or more, and may be one or none.

[0102] 17 to 19 , the upper connecting pipe 230 has an upper connecting portion 235 connectable to the first vertical pipe P1 and a lower connecting portion (lower end) 236 connectable to the intermediate pipe 232. The lower connecting portion 236 is located in the upper connecting pipe 230 near the lower side of the horizontal pipe connecting portion 221. The drainage water from the horizontal pipe connecting portion 221 joins at the lower connecting portion 236. Hereinafter, the lower connecting portion 236 may be referred to as the "horizontal pipe junction portion 236." The horizontal pipe junction portion 236 is located in the upper connecting pipe 230 near the lower side of the horizontal pipe connecting portion 221, and is a main junction portion where the drainage water from the horizontal pipe connecting portion 221 joins.

[0103] 18 and 20 , a blade unit 231 is fitted to the upper end of the upper connecting pipe 230 in the vertical pipe connecting portion 220. The blade unit 231 has a unit body 240, a seal member 241, and a pressing member 242.

[0104] As shown in Figures 20 to 22, the unit body 240 has an upper vertical pipe connection portion 245, a blade support portion 246, a plurality of reinforcing ribs 247, and a first swirl vane (swirl vane) 248. The upper vertical pipe connection portion 245 is fitted to the upper end of the upper connecting pipe 230 at the vertical pipe connection portion 220 (see Figure 18). The upper vertical pipe connection portion 245 has a protrusion 245a. The protrusion 245a protrudes radially outward from the outer surface of the upper vertical pipe connection portion 245. The protrusion 245a engages with the recess 237 (see Figure 18) of the upper connecting pipe 230, thereby enabling the unit body 240 (specifically, the first swirl vane 248) to be positioned circumferentially relative to the upper connecting pipe 230.

[0105] The blade support portion 246 extends downward from a portion of the circumferential direction at the lower end of the upper vertical pipe connecting portion 245. That is, the upper vertical pipe connecting portion 245 is connected to the upper end of the blade support portion 246. The blade support portion 246 is formed in a curved flat plate shape, and is formed in an arc shape when viewed in the vertical direction. The blade support portion 246 extends in the vertical direction. That is, the circumferential length of the blade support portion 246 is approximately constant regardless of the position in the vertical direction. A plurality of reinforcing ribs 247 are provided on an outer surface 246a of the blade support portion 246 that faces the inner surface of the upper connecting pipe 230.

[0106] The plurality of reinforcing ribs 247 extend vertically along the axis O11 on the outer surface 246a of the blade support portion 246 from the lower end of the upper vertical pipe connecting portion 245 to the lower end of the blade support portion 246. The plurality of reinforcing ribs 247 protrude from the outer surface 246a of the blade support portion 246 to the inner surface of the upper connecting pipe 230. The plurality of reinforcing ribs 247 contact the inner surface of the upper connecting pipe 230. By bringing the plurality of reinforcing ribs 247 into contact with the inner surface of the upper connecting pipe 230, the plurality of reinforcing ribs 247 can suppress vibrations of the blade support portion 246 and the first swirl vanes 248. The plurality of reinforcing ribs 247 constitute a vibration suppression portion (vibration reduction portion) 249. That is, the vibration suppression portion 249 contacts the inner surface of the upper connecting pipe 230 and has a vibration suppression function for the blade support portion 246 and the first swirl vanes 248.

[0107] The multiple reinforcing ribs 247 are arranged at intervals in the circumferential direction of the upper connecting pipe 230. A space 250 partitioned by the multiple reinforcing ribs 247 is formed between the outer surface 246a of the blade support portion 246 and the inner surface of the upper connecting pipe 230. In other words, the space 250 is formed by being surrounded by the upper connecting pipe 230, the blade support portion 246, and the multiple reinforcing ribs 247.

[0108] As shown in Figures 21 to 24, the lower end 246b of the blade support portion 246 extends gradually downward in the circumferential direction toward the first side X1 (first side in the circumferential direction). The first swirl vane 248 is provided on the inner surface (surface facing radially inward) of the lower end 246b of the blade support portion 246. The upper surface 248a of the first swirl vane 248 protrudes radially inward from the blade support portion 246 at an inclination angle θ11 of 116°. The upper surface 248a of the first swirl vane 248 is inclined at an inclination angle θ12 of 45° so as to gradually slope downward in the circumferential direction toward the first side X1. The inclination angle θ12 is the angle of inclination from one side 246c of the blade support portion 246 to the other side 246d with respect to a plane perpendicular to the axis O11.

[0109] The first swirl vane 248 comes into contact with the wastewater in the upper connecting pipe 230 at the vertical pipe connecting portion 220, thereby making it easier for the wastewater to stagnate locally near the first swirl vane 248. This significantly improves the drainage capacity in the upper connecting pipe 230. The upper vertical pipe connecting portion 245, the vane support portion 246, the multiple reinforcing ribs 247, and the first swirl vane 248 of the unit body 240 are integrally formed from polyvinyl chloride resin or the like.

[0110] As shown in FIGS. 20 , 25 , and 26 , the upper connecting pipe 230 has a plurality of vertical ribs (backflow prevention ribs) 252 on its inner surface. The vertical ribs 252 are arranged circumferentially on the inner surface of the upper connecting pipe 230. Specifically, the vertical ribs 252 are arranged between adjacent horizontal pipe connecting portions 221 in the circumferential direction and between adjacent horizontal pipe connecting portions 221 and the blade support portion 246 in the circumferential direction. That is, four vertical ribs 252 are arranged at intervals in the circumferential direction. The vertical ribs 252 are arranged vertically along the axis O11. Of the vertical ribs 252, the vertical rib 252A is arranged below the first swirl vane 248 (see FIG. 18 ). The height of the vertical rib 252A is kept low to avoid the first swirl vane 248. The vertical rib 252A supports the first swirl vane 248 (see FIG. 18) from below. The vertical rib 252 prevents wastewater from flowing back into the horizontal pipe connecting portion 221.

[0111] The lower ends 252a of the vertical ribs 252 are positioned at the same height in the direction of the axis O11. The lower ends 252a of the vertical ribs 252 are positioned within a first allowable height range, for example, equal to or greater than the lower end 226a of the opening 226 in the horizontal pipe connecting portion 221 and equal to or less than 25 mm from the lower end 226a of the opening 226. The lower end 226a of the opening 226 is the lowest position of the opening 226 in the direction of the axis O11.

[0112] Here, the horizontal bushing 225 has an opening 229. The opening 229 is an opening formed by the end of the horizontal bushing 225 that opens to the vertical pipe connection portion 220. The opening 229 can also be considered as the opening of the horizontal bushing 225 when viewed from the inside of the upper connecting pipe 230. The opening diameter (inner diameter) of the opening 229 of the horizontal bushing 225 varies depending on the diameter of the horizontal pipe P3 (see FIG. 17 ). However, the opening 229 is eccentric downward relative to the horizontal pipe connection portion 221. Here, the axis of the opening 229 is the axis O12 of the horizontal bushing 225. In this case, the lower end 252a of the vertical rib 252 may be located in a second allowable range, which is equal to or greater than the lower end 226a of the opening 226 and equal to or less than the axis O12 of the horizontal bushing 225. The lower end 252a of the vertical rib 252 may be located in both the first allowable range and the second allowable range, or in only one of the first allowable range and the second allowable range. Furthermore, the lower limit of the second allowable range may be the lower end 229 a of the opening 229 in the horizontal bush 225 , rather than the lower end 226 a of the opening 226 in the horizontal pipe connecting portion 221 .

[0113] (Intermediate Pipe) As shown in Figures 17, 18, 27, and 28, an intermediate pipe 232 is connected to the horizontal pipe junction 236 of the upper connecting pipe 230. The intermediate pipe 232 is made, for example, by injection molding a resin composition. A second swirl vane may be provided on the inner surface of the intermediate pipe 232. The intermediate pipe 232 has, for example, a straight pipe section 260, a first connecting port 261, and a second connecting port 262. In the fourth embodiment, the first connecting port 261 is a "receiving port 261." The second connecting port 262 is a "spigot port 262."

[0114] In the fourth embodiment, the first connection port 261 is described as a "socket 261" and the second connection port 262 as a "plug 262," but this is not limited to this. As another example, the first connection port 261 may be described as a "plug" and the second connection port 262 as a "plug." Furthermore, the first connection port 261 may be described as a "plug" and the second connection port 262 as a "plug." Furthermore, the first connection port 261 may be described as a "plug" and the second connection port 262 as a "plug."

[0115] The straight pipe section 260 is disposed between the socket 261 and the spigot 262 in the direction of the axis O11. The socket 261 is coaxially disposed at the upper end of the straight pipe section 260. The socket 261 is connected by being fitted into the horizontal pipe junction 236 of the upper connecting pipe 230. Therefore, the outer surface of the connection portion between the socket 261 and the horizontal pipe junction 236 of the upper connecting pipe 230 is the outer surface of the socket 261. The straight pipe section 260 is disposed coaxially at the lower end of the straight pipe section 260. The inner diameters of the straight pipe section 260 and the spigot 262 are preferably larger than the inner diameter of the first vertical pipe P1. The spigot 262 is connected by being fitted into a socket 291 of the lower connecting pipe 233 (described later). Therefore, the outer surface of the connection portion between the spigot 262 and the spigot 291 of the lower connecting pipe 233 is the outer surface of the spigot 291.

[0116] As shown in Figures 27 and 28, the straight pipe section 260 is formed to have a circular cross section. The outer diameter of the straight pipe section 260 is the same as the outer diameter of the upper connecting pipe 230. The inner diameter of the straight pipe section 260 is the same as the inner diameter of the upper connecting pipe 230. The straight pipe section 260 has a thick-walled section 265. The thick-walled section 265 is molded integrally with the straight pipe section 260. The thick-walled section 265 is a protruding section that protrudes radially outward from the side surface of the straight pipe section 260. Hereinafter, the thick-walled section 265 may be referred to as the "protruding section 265."

[0117] The protruding portion 265 has a plurality of first ribs 265a and a plurality of second ribs 265b. The plurality of first ribs 265a are provided at intervals in the direction of the axis O11 on the side surface of the straight pipe portion 260. The plurality of first ribs 265a are formed in an annular shape by extending in the circumferential direction along the side surface of the straight pipe portion 260. The plurality of second ribs 265b are provided at intervals in the circumferential direction on the side surface of the straight pipe portion 260. The plurality of second ribs 265b are formed in a linear shape by extending in the direction of the axis O11 along the side surface of the straight pipe portion 260.

[0118] The plurality of first ribs 265a and the plurality of second ribs 265b are provided over the entire side surface of the straight pipe section 260. The plurality of first ribs 265a and the plurality of second ribs 265b are arranged so as to be perpendicular to each other. The outer surfaces of the plurality of first ribs 265a and the outer surfaces of the plurality of second ribs 265b are formed flush with each other. The outer surfaces of the plurality of first ribs 265a and the outer surfaces of the plurality of second ribs 265b form the "outer surface of the straight pipe section 260." The outer surface of the straight pipe section 260 is flush with the outer surface of the socket 261 in the intermediate pipe 232 and the outer surface of the socket 291 (described later) in the lower connecting pipe 233.

[0119] In the fourth embodiment, an example will be described in which both the plurality of first ribs 265 a and the plurality of second ribs 265 b are provided as the protrusion 265, but this is not limiting. As another example, either the plurality of first ribs 265 a or the plurality of second ribs 265 b may be the protrusion 265.

[0120] Here, the intermediate pipe 232 has a first recess 267 and a second recess 268. The first recess 267 is formed at the upper end of the socket 261. The first recess 267 fits into the protrusion 238 (see FIG. 19 ) of the upper connecting pipe 230, thereby positioning the intermediate pipe 232 circumferentially relative to the upper connecting pipe 230. The second recess 268 is formed in the lowest first rib 265a among the multiple first ribs 265a. The second recess 268 fits into the protrusion 295 (see FIG. 31 ) of the lower connecting pipe 233, thereby positioning the lower connecting pipe 233 circumferentially relative to the intermediate pipe 232. Here, as shown in FIG. 18 , the first swirl vane 248 is positioned circumferentially relative to the upper connecting pipe 230. Therefore, by positioning the intermediate pipe 232 circumferentially relative to the upper connecting pipe 230 and positioning the lower connecting pipe 233 circumferentially relative to the intermediate pipe 232, the third swirl vane 300 (described later) of the lower connecting pipe 233 can be positioned circumferentially relative to the first swirl vane 248.

[0121] (First Modification of Intermediate Pipe) As shown in Figure 29, the intermediate pipe 232 of the fourth embodiment may be replaced with an intermediate pipe 272. The intermediate pipe 272 is obtained by replacing the straight pipe section 260 of the fourth embodiment with a straight pipe section 273. The straight pipe section 273 is formed to have a circular cross section. The straight pipe section 273 has a thick-walled section 274 whose thickness is constant around the entire periphery. The outer surface of the entire periphery of the straight pipe section 273 is flush with the outer surface of the socket 261 of the intermediate pipe 272 and the outer surface of the socket 291 (described later) of the lower connecting pipe 233.

[0122] (Second Modification of Intermediate Pipe) As shown in FIG. 30 , the intermediate pipe 272 of the first modification may be replaced with an intermediate pipe 282. The intermediate pipe 282 is obtained by replacing the straight pipe section 273 of the first modification with a straight pipe section 283 and replacing the spigot 262 of the first modification with a socket 285. The outer surface of the straight pipe section 283 is flush with the outer surfaces of the sockets 261 and 285 of the intermediate pipe 282. The straight pipe section 283 also has a plurality of grooves 286 on its inner surface. The grooves 286 are spaced apart circumferentially. The grooves 286 are recessed radially outward from the inner surface of the straight pipe section 283 and extend along the axis O11. This allows the wall thickness of the straight pipe section 283 to be reduced at intervals circumferentially.

[0123] Here, ribs 287 are formed circumferentially between the plurality of grooves 286 on the inner surface of the straight pipe portion 283. The plurality of ribs 287 protrude radially inward and extend along the axis O11. Therefore, when the socket 261 of the intermediate pipe 282 is fitted into the horizontal pipe junction 236 (see FIG. 18 ) of the upper connecting pipe 230, the upper ends of the plurality of ribs 287 abut against the horizontal pipe junction 236 and serve as stoppers. Furthermore, when the socket 285 of the intermediate pipe 282 is fitted into the spigot (not shown) of the lower connecting pipe 233, the lower ends of the plurality of ribs 287 abut against the spigot of the lower connecting pipe 233 and serve as stoppers.

[0124] 17 to 19 and 31 , the lower connecting pipe 233 is a pipe whose diameter is smaller at the bottom than at the top. The lower connecting pipe 233 is disposed below the intermediate pipe 232. The lower connecting pipe 233 includes a socket (upper end) 291 located at its upper end and connected to the spigot 262 of the intermediate pipe 232, a connecting pipe portion 292 provided at the lower end of the socket 291, a tapered portion 293 tapered downward at the lower end of the connecting pipe portion 292, and a lower pipe portion 294 provided at the lower end of the tapered portion 293 and to which the second vertical pipe P2 is connected. The lower connecting pipe 233 is integrally formed by, for example, injection molding of a synthetic resin material.

[0125] The lower pipe section 294 connects to the second vertical pipe P2 below the tapered section 293. The outer diameter of the lower pipe section 294 is the minimum outer diameter of the vertical pipe connection section 220 below the tapered section 293. The minimum outer diameter is 110 mm or more and 120 mm or less. The tapered section 293 is inclined so that its diameter decreases downward from the lower end of the connecting pipe section 292 to the lower pipe section 294. The inclination angle θ13 of the tapered section 293 is 80° or more and 85° or less. Here, the slab thickness T of the floor slab S is formed to be 150 mm or more, which is thicker than a normal slab thickness. For example, when the collective joint 210 is installed on the floor slab S by branch floating construction, it is preferable to position at least the upper half of the tapered section 293 in the through hole H of the floor slab S.

[0126] The inner diameter of the socket 291 is larger than the spigot 262 of the intermediate pipe 232. The spigot 262 of the intermediate pipe 232 is fitted inside the socket 291. The outer diameter of the connecting pipe portion 292 is smaller than the outer diameter of the socket 291. The outer diameter of the socket 291 is the maximum outer diameter of the vertical pipe connecting portion 220. The maximum outer diameter of the vertical pipe connecting portion 220 is 180 mm or more and 195 mm or less.

[0127] Because the outer diameter of the connecting pipe portion 292 is smaller than the outer diameter of the socket 291, a peripheral step is formed at the boundary between the socket 291 and the connecting pipe portion 292. Similar to the protrusion 265 of the intermediate pipe 232, a first rib 296 and a second rib 297 are provided on the side surface of the connecting pipe portion 292. The outer surfaces of the first rib 296 and the second rib 297 form the outer surface of the connecting pipe portion 292. Therefore, the outer surface of the connecting pipe portion 292 is formed to be flush with the outer surface of the socket 291, the outer surface of the straight pipe portion 260 of the intermediate pipe 232, and the outer surface of the socket 261 of the intermediate pipe 232.

[0128] As shown in Figures 17, 19, and 32, the outer diameter at the upper end of the tapered portion 293 is the same as the outer diameter of the connecting pipe portion 292. The outer diameter at the lower end of the tapered portion 293 is smaller than the outer diameter at the upper end of the tapered portion 293. A third swirl vane 300 is provided on the inner surface of the vertically middle portion of the tapered portion 293. The third swirl vane 300 gradually extends circumferentially toward the first side X1 as it extends from top to bottom. More specifically, the surface 300a of the third swirl vane 300 facing the first side X1 gradually extends from top to bottom toward the first side X1. The surface 300b of the third swirl vane 300 facing the second side X2 gradually extends circumferentially toward the first side X1 as it extends from top to bottom.

[0129] As shown in Figures 32 to 34, the third swirl vane 300 is inclined downward at an inclination angle θ14 of 68° from the upper end 300c to the lower end 300d. The inclination angle θ14 is the angle of inclination from the upper end 300c to the lower end 300d with respect to a plane perpendicular to the axis O11. The overall length of the third swirl vane 300 is 150 mm. The overall length is the length from the upper end 300c to the lower end 300d. The third swirl vane 300 protrudes, for example, from the outer side to the inner side of the tapered portion 293 at an inclination angle θ15 of 30° relative to the radial direction. The width (circumferential size) of the third swirl vane 300 is 36 mm. The width of the third swirl vane 300 is the width from the inner edge 300e to the outer edge 300f of the third swirl vane 300 when viewed radially from the axis O11. The third swirl vane 300 changes the flow of wastewater flowing inside the lower connecting pipe 233 and causes it to swirl.

[0130] The outer diameter of the lower pipe portion 294 is smaller than the outer diameter of the socket 261 in the intermediate pipe 232. The second vertical pipe P2 in the lower floor F2 is fitted from below onto the outside of the lower pipe portion 294, thereby connecting the second vertical pipe P2 to the lower connecting pipe 233. In the fourth embodiment, an example will be described in which the lower pipe portion 294 serves as a spigot for the second vertical pipe P2, but the lower pipe portion 294 may also serve as a socket for the second vertical pipe P2.

[0131] 17 to 19 , the fire-resistant material 212 is provided on the outer surface of the vertical pipe connection portion 220. The fire-resistant material 212 is covered with a lower sound-insulating cover 214, which will be described later. That is, the fire-resistant material 212 is provided between the vertical pipe connection portion 220 and the lower sound-insulating cover 214. The fire-resistant material 212 is provided, for example, in a position in the direction of the axis O11 that avoids the first swirl vane 248, the plurality of vertical ribs 252, and the third swirl vane 300.

[0132] The height H2 of the fireproofing material 212 is preferably greater than 150 mm and equal to or less than 300 mm in the direction of the axis O11. In the fourth embodiment, as an example, the height H2 of the fireproofing material 212 is 210 mm, and the thickness of the fireproofing material 212 is 2 mm. The height H2 of the fireproofing material 212 is preferably greater than the height of the intermediate pipe 232. For example, in a state in which the collective joint 210 is installed on the floor slab S by floating construction, it is preferable to position at least the lower half of the fireproofing material 212 in the through hole H of the floor slab S.

[0133] The fire-resistant material 212 may be, for example, a fire-resistant sheet 310 made of resin containing thermally expandable graphite. The fire-resistant sheet 310 has thermal expandability, expanding when heated to form a fire-resistant heat-insulating layer. ２ There are no particular restrictions on the material as long as the volume expansion rate after heating for 30 minutes under the heating conditions is 3 to 100 times, but materials made of a resin binder and an inorganic filler are preferred. Specifically, the fire-resistant sheet 310 is formed, for example, from Fi-Block (registered trademark), a commercially available product manufactured by Sekisui Chemical Co., Ltd.

[0134] The fireproof sheet 310 is disposed, for example, on the outer surface of the socket 261 of the intermediate pipe 232, the outer surface of the straight pipe section 260 of the intermediate pipe 232, the outer surface of the socket 291 of the lower connecting pipe 233, and the outer surface of the connecting pipe section 292 of the lower connecting pipe 233. By attaching the fireproof sheet 310 to the socket 261 of the intermediate pipe 232, the straight pipe section 260 of the intermediate pipe 232, the socket 291 of the lower connecting pipe 233, and the connecting pipe section 292 of the lower connecting pipe 233, the height H2 of the fireproof material 212 can be set to 210 mm. The upper end 212a of the fireproof material 212 is preferably located 15 mm below the lower end of the outer surface of the horizontal pipe connecting section 221. The thermal expansion coefficient of the fireproof material 212 is preferably 1.3 to 100 times.

[0135] Here, the reasons for setting the height H2 of the fire-resistant material 212 to 210 mm and the thermal expansion coefficient of the fire-resistant material 212 to 1.3 times or more and 100 times or less will be explained with reference to Figures 35 to 40. Figures 35 to 40 show examples in which the slab thickness T of the floor slab S is set to 150 mm, 100 mm, and 75 mm, and the collective joint 210 is installed on the floor slab S by branch floating construction and normal construction.

[0136] First, a case where the slab thickness T of the floor slab S is 150 mm will be described with reference to Figures 35 and 36. As shown in Figure 35, the joint assembly 210 is installed at a height H1 below the slab by floating the slab on the floor slab S with a slab thickness T of 150 mm. In this case, by setting the height H2 of the fire-resistant material 212 to 210 mm, an 85 mm range of the fire-resistant material 212 can be buried in the through-hole H.

[0137] Furthermore, when the slab thickness T of the floor slab S is 150 mm, at least the upper half of the tapered portion 293 can be embedded in the through hole H of the floor slab S. Furthermore, the inclination angle θ3 of the tapered portion 293 is set to be equal to or greater than 80° and equal to or less than 85°. Therefore, the tapered portion 293 can prevent the fall-off of residue of the fireproof material 212 generated by the flames on the floor F2 below the floor slab S. Prevention of residue fall-off will be explained in detail later.

[0138] 36, the joint assembly 210 may be installed in a floor slab S having a slab thickness T of 150 mm by normal construction. In this case, by setting the height H2 of the fire-resistant material 212 to 210 mm, a range of 135 mm of the fire-resistant material 212 can be embedded in the through-hole H. This ensures a large embedding range for the fire-resistant material 212. As a result, if a fire breaks out on the floor F2 below the floor slab S, the fire-resistant material 212 will thermally expand, allowing the through-hole H to be properly blocked.

[0139] As shown in Figures 35 and 36, when the slab thickness T is 150 mm, by setting the height H2 of the fire-resistant material 212 to 210 mm, the fire resistance of the fire-resistant material 212 can be ensured in the event of a fire breaking out on the floor F2 below the floor slab S.

[0140] Next, a case where the slab thickness T of the floor slab S is 100 mm will be described with reference to Figures 37 and 38. As shown in Figure 37, the collective joint 210 may be installed at a height H1 below the slab by floating the slab on a floor slab S having a slab thickness T of 100 mm. By setting the height H2 of the fire-resistant material 212 to 210 mm, an 85 mm range of the fire-resistant material 212 can be embedded in the through-hole H. In this case, by setting the thermal expansion coefficient of the fire-resistant material 212 to be 1.3 times or more and 100 times or less, the thermal expansion of the fire-resistant material 212 can adequately block the through-hole H.

[0141] 38, the joint assembly 210 may be installed in a floor slab S having a slab thickness T of 100 mm by normal construction. By setting the height H2 of the fire-resistant material 212 to 210 mm, an 85 mm range of the fire-resistant material 212 can be embedded in the through-hole H. In this case, by setting the thermal expansion coefficient of the fire-resistant material 212 to 1.3 times or more and 100 times or less, the thermal expansion of the fire-resistant material 212 can adequately close the through-hole H.

[0142] Next, a case where the slab thickness T of the floor slab S is 75 mm will be described with reference to Figures 39 and 40. As shown in Figure 39, the collective joint 210 may be installed at a height H1 below the slab by floating the slab on a floor slab S having a slab thickness T of 75 mm. By setting the height H2 of the fire-resistant material 212 to 210 mm, a 75 mm range of the fire-resistant material 212 can be embedded in the through-hole H. In this case, by setting the thermal expansion coefficient of the fire-resistant material 212 to be 1.3 times or more and 100 times or less, the thermal expansion of the fire-resistant material 212 can adequately block the through-hole H.

[0143] 40, the assembly joint 210 may be installed in a floor slab S having a slab thickness T of 75 mm by normal construction. By setting the height H2 of the fire-resistant material 12 to 210 mm, a range of 60 mm of the fire-resistant material 212 can be embedded in the through-hole H. In this case, by setting the thermal expansion coefficient of the fire-resistant material 212 to 1.3 times or more and 100 times or less, the thermal expansion of the fire-resistant material 212 can adequately close the through-hole H.

[0144] As shown in Figures 38 and 40, when the slab thickness T is 75 mm or 100 mm, it is preferable to set the height H2 of the fire-resistant material 212 to 210 mm and set the thermal expansion coefficient of the fire-resistant material 212 to 1.3 times or more and 100 times or less. Therefore, if a fire breaks out on the floor F2 below the floor slab S, the fire resistance of the fire-resistant material 212 can be ensured. As a result, by setting the height H2 of the fire-resistant material 212 to 210 mm and setting the thermal expansion coefficient of the fire-resistant material 212 to 1.3 times or more and 100 times or less, it is also possible to keep the thickness of the floor slab S to less than 100 mm.

[0145] In the fourth embodiment, an example will be described in which the fire-resistant material 212 covers the joint body 211 from the intermediate pipe 232 to the lower connecting pipe 233, but this is not limiting. As another example, the fire-resistant material 212 may cover the joint body 211 from the upper connecting pipe 230 to the intermediate pipe 232. Furthermore, the fire-resistant material 212 may cover the joint body 211 from the intermediate pipe 232 to the lower connecting pipe 233.

[0146] 17 and 41 , the fire-resistant material 212 may include a plurality of fire-resistant sheets 312. The width of the fire-resistant sheets 312 is formed, for example, narrower than the width from the socket 261 of the intermediate pipe 232 to the connecting pipe portion 292 of the lower connecting pipe 233 in the direction of the axis O11. The plurality of fire-resistant sheets 312 are arranged in a state of being wrapped around the outer surfaces of the socket 61 of the intermediate pipe 232, the straight pipe portion 260 of the intermediate pipe 232, the socket 291 of the lower connecting pipe 233, and the connecting pipe portion 292 of the lower connecting pipe 233 in the circumferential direction. Adjacent fire-resistant sheets 312 are overlapped or butted together in the direction of the axis O11 of the vertical pipe connecting portion 220. Therefore, the fire-resistant material 212 formed from multiple fire-resistant sheets 312 can cover the outer surfaces of the receiving port 261 of the intermediate pipe 232, the straight pipe section 260 of the intermediate pipe 232, the receiving port 291 of the lower connecting pipe 233, and the connecting pipe section 292 of the lower connecting pipe 233.

[0147] Here, a plurality of second ribs 265b are provided at intervals in the direction of the axis O11 on the outer surface of the straight pipe section 260 of the intermediate pipe 232. The plurality of second ribs 265b extend in the direction of the axis O11 along the outer surface of the straight pipe section 260. The outer surfaces of the plurality of second ribs 265b are formed flush with the outer surfaces of the socket 261 of the intermediate pipe 232 and the socket 91 of the lower connecting pipe 233. The plurality of fire-resistant sheets 314 are arranged on the outer surfaces of the plurality of second ribs 265b. Therefore, the plurality of fire-resistant sheets 314 can be appropriately arranged on the outer surface of the intermediate pipe 232 while suppressing the occurrence of wrinkles.

[0148] Next, a method for installing the manifold 210 in which multiple fire-resistant sheets 312 are installed will be described. First, multiple fire-resistant sheets 312 are wrapped circumferentially around the outer surfaces of the socket 261 of the intermediate pipe 232, the straight pipe section 260 of the intermediate pipe 232, the socket 291 of the lower connecting pipe 233, and the connecting pipe section 292 of the lower connecting pipe 233. During this process, adjacent fire-resistant sheets 312 are overlapped or butted together in the direction of the axis O11. Thus, multiple fire-resistant sheets 312 can be continuously arranged on the outer surfaces of the socket 261 of the intermediate pipe 232, the straight pipe section 260 of the intermediate pipe 232, the socket 291 of the lower connecting pipe 233, and the connecting pipe section 292 of the lower connecting pipe 233. That is, it is possible to form the fire-resistant material 212 that covers the outer surfaces of the socket 261 of the intermediate pipe 232, the straight pipe section 260 of the intermediate pipe 232, the socket 291 of the lower connecting pipe 233, and the connecting pipe section 292 of the lower connecting pipe 233. This completes the construction method for the collective joint 210 in which the fire-resistant material 212 is formed with a plurality of fire-resistant sheets 312.

[0149] Here, the plurality of fireproof sheets 312 may be placed on the intermediate pipe 232 before connecting the upper connecting pipe 230, the intermediate pipe 232, and the lower connecting pipe 233 of the vertical pipe connection section 220. Here, the fireproof sheet 312 wrapped around the intermediate pipe 232 has a seam (not shown) formed where both ends meet. This seam can be used for positioning when assembling the vertical pipe connection section 220. Specifically, for example, the seams at both ends of one fireproof sheet 312 are used as positioning sections (not shown). The upper connecting pipe 230 and the lower connecting pipe 233 connected to the intermediate pipe 232 are positioned circumferentially based on this positioning section. This allows the third swirl vane 300 of the lower connecting pipe 233 to be positioned circumferentially relative to the first swirl vane 248 of the upper connecting pipe 230.

[0150] (Fireproof Material Variation 1) As shown in Figures 17 and 42, the multiple fireproof sheets 310 in the fourth embodiment may be replaced with multiple fireproof sheets 314. The length of the fireproof sheet 314 is, for example, the length from the socket 261 of the intermediate pipe 232 to the connecting pipe portion 292 of the lower connecting pipe 233. The width of the fireproof sheet 314 is, for example, narrower than the circumferential lengths of the socket 261 of the intermediate pipe 232, the straight pipe portion 260 of the intermediate pipe 232, the socket 291 of the lower connecting pipe 233, and the connecting pipe portion 292 of the lower connecting pipe 233. The multiple fireproof sheets 314 are arranged along the axis O11 on the outer surfaces of the socket 261 of the intermediate pipe 232, the straight pipe portion 260 of the intermediate pipe 232, the socket 291 of the lower connecting pipe 233, and the connecting pipe portion 292 of the lower connecting pipe 233.

[0151] The plurality of fire-resistant sheets 314 are overlapped or butted against adjacent fire-resistant sheets 310 in the circumferential direction of the vertical pipe connection portion 220. Therefore, the fire-resistant material 212 formed of the plurality of fire-resistant sheets 314 can cover the outer surfaces of the socket 261 of the intermediate pipe 232, the straight pipe portion 260 of the intermediate pipe 232, the socket 291 of the lower connecting pipe 233, and the connecting pipe portion 292 of the lower connecting pipe 233.

[0152] Here, a plurality of first ribs 265a are provided at intervals in the direction of the axis O11 on the outer surface of the straight pipe section 260 of the intermediate pipe 232. The plurality of first ribs 265a are formed in an annular shape by extending circumferentially along the outer surface of the straight pipe section 260. The outer surfaces of the plurality of first ribs 265a are formed flush with the outer surfaces of the socket 261 of the intermediate pipe 232 and the socket 291 of the lower connecting pipe 233. The plurality of fire-resistant sheets 314 are arranged on the outer surfaces of the plurality of first ribs 265a. Therefore, the plurality of fire-resistant sheets 314 can be appropriately arranged on the outer surface of the intermediate pipe 232 while suppressing the occurrence of wrinkles.

[0153] Next, a method for installing the manifold 210 in Modification 1, in which multiple fire-resistant sheets 314 are installed, will be described. First, multiple fire-resistant sheets 314 are arranged along the axis O11 of the vertical pipe connecting portion 220 on the outer surfaces of the socket 261 of the intermediate pipe 232, the straight pipe portion 260 of the intermediate pipe 232, the socket 291 of the lower connecting pipe 233, and the connecting pipe portion 292 of the lower connecting pipe 233. At this time, adjacent fire-resistant sheets 314 are overlapped or butted together in the circumferential direction of the vertical pipe connecting portion 220. Thus, multiple fire-resistant sheets 314 can be arranged continuously on the outer surfaces of the socket 261 of the intermediate pipe 232, the straight pipe portion 260 of the intermediate pipe 232, the socket 291 of the lower connecting pipe 233, and the connecting pipe portion 292 of the lower connecting pipe 233. That is, it is possible to form the fire-resistant material 212 that covers the outer surfaces of the socket 261 of the intermediate pipe 232, the straight pipe section 260 of the intermediate pipe 232, the socket 291 of the lower connecting pipe 233, and the connecting pipe section 292 of the lower connecting pipe 233. This completes the construction method for the collective joint 210 in which the fire-resistant material 212 is formed with a plurality of fire-resistant sheets 314.

[0154] Here, the plurality of fireproof sheets 314 may be placed on the intermediate pipe 232 before connecting the upper connecting pipe 230, the intermediate pipe 232, and the lower connecting pipe 233 of the vertical pipe connection section 220. The fireproof sheets 314 placed on the intermediate pipe 232 are overlapped or butted together to form seams (not shown). At least one of these seams can be used for positioning when assembling the vertical pipe connection section 220. Specifically, for example, at least one of the seams between adjacent fireproof sheets is used as a positioning portion (not shown). The upper connecting pipe 230 and the lower connecting pipe 233 connected to the intermediate pipe 232 are positioned circumferentially based on this positioning portion. This allows the third swirl vane 300 of the lower connecting pipe 233 to be positioned circumferentially relative to the first swirl vane 248 of the upper connecting pipe 230.

[0155] 17 to 19 , the upper sound-insulating cover 213 is arranged to surround the outer surface of the upper connecting pipe 230 of the joint body 211. Specifically, the upper sound-insulating cover 13 has a sound-absorbing sheet 320 that is wrapped around the upper connecting pipe 230 from the outside in the radial direction to cover the upper connecting pipe 230, and a sound-insulating sheet 321 that covers the sound-absorbing sheet 320. The sound-absorbing sheet 320 and the sound-insulating sheet 321 are each flexible.

[0156] The sound absorbing sheet 320 is made of a sound absorbing material such as needle felt. The sound absorbing sheet 320 has a surface density of, for example, 1.0 kg / m ２ , and has a thickness of 10 mm. Three first fitting openings (not shown) into which the horizontal pipe connecting portions 221 are fitted are formed in the sound absorbing sheet 320. The first fitting openings (not shown) are formed, for example, in an elliptical shape in a plan view. When the horizontal pipe connecting portions 221 are inserted through the first fitting openings, they are expanded in the horizontal direction to assume a perfect circular shape.

[0157] The sound-insulating sheet 321 is made of, for example, an olefin-based sound-insulating material. The sound-insulating sheet 321 has, for example, a surface density of 3.44 kg / m ２ , and has a thickness of 2 mm. The sound-proofing sheet 321 is formed with second fitting openings (not shown) into which the horizontal pipe connecting portions 21 are fitted. Three second fitting openings (not shown) are arranged horizontally at intervals. The second fitting openings are formed in an elliptical shape when viewed from the front. When the horizontal pipe connecting portions 221 are inserted through the second fitting openings, they are expanded horizontally to assume a perfect circular shape.

[0158] When the sound-insulating sheet 321 is wrapped around the radially outer side of the sound-absorbing sheet 320, the horizontal pipe connecting portion 221 is inserted into and fitted into the second fitting opening while the sound-insulating sheet 321 is elastically deformed so that the second fitting opening (not shown) expands. Therefore, the elastic restoring force of the sound-insulating sheet 321 causes the inner peripheral edge of the second fitting opening (not shown) to tightly abut against the outer surface of the horizontal pipe connecting portion 221.

[0159] Both lateral ends of the sound insulation sheet 321 are connected to each other at a portion of the side surface of the upper connecting pipe 230 where the horizontal pipe connecting portion 221 does not protrude. The sound absorbing sheet 320 and the sound insulation sheet 321 wrapped around the upper connecting pipe 230 are each formed in a ring shape.

[0160] The upper sound-insulating cover 213 is provided to surround the outer surface of the upper connecting pipe 230 when the sound-absorbing sheet 320 is wrapped around the upper connecting pipe 230 and the sound-absorbing sheet 320 is covered with the sound-insulating sheet 321. In this state, the lower end 213a of the upper sound-insulating cover 213 can be placed, for example, in the socket 261 of the intermediate pipe 232. Furthermore, the lower end 213a of the upper sound-insulating cover 213 can be placed above the floor slab S (upstairs) when the collective joint 210 is installed with the branches raised.

[0161] (Lower Sound-Insulating Cover) The lower sound-insulating cover 214 is provided below the upper sound-insulating cover 213 in the direction of the axis O11. The lower sound-insulating cover 214 is provided to cover a portion of the joint body 211 from the upper end 212a of the fire-resistant material 212 through the tapered portion 293 to the lower pipe portion 294. That is, the lower sound-insulating cover 214 integrally covers the intermediate pipe 232 and the lower connecting pipe 233. In the fourth embodiment, an example in which the lower sound-insulating cover 214 integrally covers the intermediate pipe 232 and the lower connecting pipe 233 is described, but this is not limited to this. As another example, for example, the lower sound-insulating cover 214 may be provided integrally below the horizontal pipe connecting portion 221 so as to indirectly cover the upper connecting pipe 230 via the intermediate pipe 232. The upper end 214a of the lower sound-insulating cover 214 is disposed in the socket 261 of the intermediate pipe 232, for example. An upper end 214 a of the lower sound insulating cover 214 is butted against, for example, a lower end 13 a of the upper sound insulating cover 213 .

[0162] The lower sound-insulating cover 214 has a two-layer structure in which an inner layer 200a made of a sound-absorbing material such as rock wool and an outer layer 200b made of a sound-insulating material such as EPDM (ethylene propylene diene rubber) are combined. Specifically, the inner layer 200a is formed of fibers such as needle felt. The inner layer 200a has a surface density of, for example, 1.0 kg / m. ２The outer layer 200b is made of a resin containing an olefin-based rubber component. The outer layer 200b has a surface density of, for example, 4.8 kg / m ２ The outer layer 200b is integrally formed by, for example, injection molding.

[0163] That is, the lower sound-insulating cover 214 is formed as a single tubular unit without being divided in the direction of the axis O11. The lower sound-insulating cover 214 is fitted, for example, into the portion from the upper end 212a of the fire-resistant material 212 to the lower end of the tapered portion 293. The lower sound-insulating cover 214 covers the outer surface of the fire-resistant material 212 and the outer surface of the tapered portion 293. Therefore, the lower sound-insulating cover 214 has an inclined portion 330 that covers the tapered portion 293, and a straight portion 331 that is formed integrally with the upper end of the inclined portion 330.

[0164] The inclined portion 330 is inclined along the tapered portion 293 so as to narrow downward. The inclination angle θ13 of the tapered portion 293 is 80° or more and 85° or less. Therefore, when the inclined portion 330 is inclined along the tapered portion 293, the inclination angle θ16 of the inclined portion 330 is 70° or more and 89° or less. The inclined portion 330 is in contact with the filler M. The straight portion 331 has the same diameter from the upper end of the inclined portion 330 to the upper end of the lower sound-insulating cover 214. The outer diameter of the straight portion 331 is the maximum outer diameter of the lower sound-insulating cover 214. The maximum outer diameter of the lower sound-insulating cover 214 is the maximum outer diameter of the collective joint 210. The maximum outer diameter of the collective joint 210 is 180 mm or more and 195 mm or less. The inner layer 200a may have a two-layer structure combining an outer layer made of a fire-resistant material such as fiber-mixed mortar and a sound-insulating sheet.

[0165] The outer layer 200b of the lower sound-insulating cover 214 may have an uneven outer surface. The reason for having an uneven outer surface of the outer layer 200b will be explained in detail later. In addition, a fiber mortar layer (not shown) covering the lower sound-insulating cover 214 may be provided at the collective joint 210. The reason for having a fiber mortar layer covering the lower sound-insulating cover 214 at the collective joint 210 will be explained in detail later.

[0166] In the fourth embodiment, an example is described in which an upper sound-insulating cover 213 and a lower sound-insulating cover 214 are provided, but it is also possible to provide only the lower sound-insulating cover 214, or only the upper sound-insulating cover 213, or neither of them is necessary.

[0167] (Fixing Tape) The fixing tape 215 is wrapped around the lower end 213a of the upper sound-insulating cover 213 and the upper end 214a of the lower sound-insulating cover 214 from the outside in the radial direction and adhered to each outer surface. The fixing tape 215 is arranged on the outer surface of the lower end 213a of the upper sound-insulating cover 213 and the outer surface of the upper end 214a of the lower sound-insulating cover 214. The outer surfaces of the upper sound-insulating cover 213 and the lower sound-insulating cover 214 are the outermost surfaces with the largest outer diameter at the horizontal pipe junction 236. In other words, the fixing tape 215 is located on the outermost surface at the horizontal pipe junction 236. The lower end 213a of the upper sound-insulating cover 213 and the upper end 214a of the lower sound-insulating cover 214 are butted together at the socket 261 of the intermediate pipe 232. Therefore, the lower end 213 a of the upper sound insulating cover 213 and the upper end 214 a of the lower sound insulating cover 214 are fixed to the outer surface of the socket 261 of the intermediate pipe 232 with fixing tape 215 .

[0168] The fixing tape 215 is formed of a material such as a butyl-based rubber sheet with a polyolefin-based film. The fixing tape 215 can waterproof the area where it is attached. The upper sound-insulating cover 213 and the lower sound-insulating cover 214 are fixed with the fixing tape 215 so as to cover the vertical pipe connection portion 220. This provides the joint body 211 with excellent sound insulation. For example, even if drainage water passes through the inside of the joint body 211, the structure makes it difficult for the drainage sound to leak to the outside.

[0169] Here, the lower end 213a of the upper sound-insulating cover 213 and the upper end 214a of the lower sound-insulating cover 214 are fixed to the socket 261 of the intermediate pipe 232 by fixing tape 215. Therefore, the upper end of the fixing tape can be arranged, for example, at the top of the horizontal pipe junction 236. The top of the horizontal pipe junction 236 is the highest position of the vertical pipe connection section 220 below the horizontal pipe connection section 221. More specifically, the top of the horizontal pipe junction 236 is a position corresponding to the lower end 221a of the outer surface of the horizontal pipe connection section 221 at the horizontal pipe junction 236. Therefore, for example, the fixing tape 215 can be arranged at a height equal to or greater than half the slab thickness T of the floor slab S. Alternatively, when the collective joint 210 is installed with the branch raised, the fixing tape 215 can be arranged above the floor slab S (i.e., at a position higher than the floor slab S).

[0170] In the fourth embodiment, an example in which the upper sound-insulating cover 213 and the lower sound-insulating cover 214 are provided will be described, but this is not limiting. As another example, the fixing tape 215 may be applied even when the collective joint 210 is provided with only the lower sound-insulating cover 214. Specifically, with the fixing tape 215 attached (positioned) to the upper end 214a of the lower sound-insulating cover 214, the upper end of the fixing tape 215 is wrapped around and attached from the outside to the outer surface of the socket 261 in the intermediate pipe 232. The upper end 214a of the lower sound-insulating cover 214 is fixed to the outer surface of the socket 261 in the intermediate pipe 232 with the fixing tape 215.

[0171] In this case, the fixing tape 215 is disposed on the outer surface of the lower sound-insulating cover 214 and the outer surface of the receiving port 261 in the intermediate pipe 232. The outer surface of the lower sound-insulating cover 214 and the outer surface of the receiving port 261 in the intermediate pipe 232 are the outermost surfaces with the largest outer diameter at the horizontal pipe junction 236. In this state, the upper end of the fixing tape 215 can be disposed at the top of the horizontal pipe junction 236, for example. Also, the upper end of the fixing tape 215 is located at the outermost surface at the horizontal pipe junction 236, for example. The reason for disposing the upper end of the fixing tape 215 at the top of the horizontal pipe junction 236 will be explained in detail later.

[0172] (Installation of the collective joint) As shown in Figure 17, the collective joint 210 is installed on the floor slab S by branch-floating construction, in which the horizontal pipe connection part 221 is raised a predetermined distance above the surface of the floor slab S. Below, the process of installing the collective joint 210 on the floor slab S by branch-floating construction will be described with reference to Figure 17.

[0173] 17 and 18 , the fireproof material 212 is attached to the vertical pipe connection portion 220 of the joint body 211. Next, the upper sound-insulating cover 213 and the lower sound-insulating cover 214 are attached to the vertical pipe connection portion 220. The lower end 213a of the attached upper sound-insulating cover 213 and the upper end 214a of the lower sound-insulating cover 214 are fixed with fixing tape 215. By attaching the fireproof material 212, the upper sound-insulating cover 213, the lower sound-insulating cover 214, and the fixing tape to the vertical pipe connection portion 220, the assembly of the joint assembly 210 is completed.

[0174] The collective joint 210 is inserted into the through-hole H of the floor slab S. The collective joint 210 is installed in a state in which the straight pipe section 260 of the intermediate pipe 232, the socket 291 of the lower connecting pipe 233, the connecting pipe section 292 of the lower connecting pipe 233, and at least the upper half of the tapered section 293 of the lower connecting pipe 233 are disposed in the through-hole H of the floor slab S. With the collective joint 210 disposed in the through-hole H, the upper end of the second vertical pipe P2 of the lower floor F2 (for example, a commercially available Eslon (registered trademark) fire-resistant VP pipe manufactured by Sekisui Chemical Co., Ltd. can be used) is fitted into and connected to the lower pipe section 294 of the lower connecting pipe 233. In this state, for example, at least the lower half of the fire-resistant material 212 and the inclined section 330 of the lower sound-insulating cover 214 are accommodated inside the through-hole H.

[0175] Next, the lower end of the first vertical pipe P1 on the upper floor F1 is fitted into the upper vertical pipe connection portion 245 and the seal member 241 of the blade unit 231 to connect the first vertical pipe P1 to the vertical pipe connection portion 220. By connecting the upper end of the second vertical pipe P2 to the lower pipe portion 294 of the lower connecting pipe 233 and connecting the lower end of the first vertical pipe P1 to the vertical pipe connection portion 220, the horizontal pipe connection portion 221 is positioned above the floor slab S, floating by the branch height H1. The branch height H1 is preferably 140 mm.

[0176] Next, a filler M such as mortar or rock wool is filled between the inner surface of the through hole H and the outer surface of the manifold 210 (specifically, the lower sound-insulating cover 214). In this state, the inclined portion 330 of the lower sound-insulating cover 214 is embedded in the filler M. At least the lower half of the fire-resistant material 212 is embedded in the filler M. Furthermore, at least the upper half of the straight pipe portion 260 of the intermediate pipe 232, the socket 291 of the lower connecting pipe 233, the connecting pipe portion 292 of the lower connecting pipe 233, and the tapered portion 293 of the lower connecting pipe 233 are embedded in the filler M. As the filler M, it is preferable to use mortar, which has excellent residue retention properties.

[0177] With the through-hole H filled with filler M, the end of the horizontal pipe P3 is inserted into the horizontal bushing 225 of the horizontal pipe connecting part 221 to connect the horizontal pipe P3 to the horizontal pipe connecting part 221. This allows the horizontal pipe P3 to be positioned at a height that corresponds to the toilet outlet, for example. This completes the process of installing the collective joint 210 on the floor slab S by branch-floating construction.

[0178] The effects of the floor structure 201, the mass joint 210, and the method for constructing the mass joint 210 according to the fourth embodiment described above will be described with reference to Figs. 17 to 42.

[0179] That is, the diameter of the through hole H in the floor slab S is set to 210 mm or more and 300 mm or less. Therefore, the diameter of the through hole H can be adjusted to the maximum outer diameter of the collective joint 210 (for example, the lower sound-insulating cover 214 or the vertical pipe connection portion 220). This makes it easier to install the collective joint 210 in the floor slab S.

[0180] Furthermore, the inclination angle θ13 of the tapered portion 293 in the vertical pipe connection portion 220 is set to be 80° or more and 85° or less. Furthermore, the inclination angle θ16 of the inclined portion 330 in the lower sound-insulating cover 214 covering the tapered portion 293 is set to be 70° or more and 89° or less. By setting the inclination angle θ16 of the inclined portion 330 to be 70° or more and 89° or less, the tapered shape (inclined shape) of the inclined portion 330 is transferred to the filler M, and the inner surface of the filler M also has a tapered (inclined) shape. Therefore, for example, the tapered inner surface of the filler M can prevent residue of the fire-resistant material 212 generated by a fire on the floor below F2 from falling off. This allows the residue to remain in the through hole H, thereby achieving the fire-resistant performance of the collective joint 210.

[0181] Furthermore, the inclination angle θ13 of the tapered portion 293 is set to be equal to or greater than 80° and equal to or less than 85°. Therefore, when the lower sound-insulating cover 214 is not present, the tapered shape of the tapered portion 293 is transferred to the filler M, and the inner surface of the filler M also has a tapered shape. For example, the tapered inner surface of the filler M can prevent residue of the fire-resistant material 212 caused by the flames on the floor below F2 from falling off. This allows the residue to remain in the through hole H, allowing the fire-resistant performance of the collective joint 210 to be exerted.

[0182] Here, if the inclination angle θ13 of the tapered portion 293 is too small, it is conceivable that, for example, the wastewater will jump inside the collective joint 210, reducing the drainage performance. Therefore, by setting the inclination angle θ13 of the tapered portion 293 to 80° or more, the inclination angle θ13 of the tapered portion 293 is properly ensured. This makes it possible to maintain an appropriate flow of wastewater inside the collective joint 210 and ensure drainage performance.

[0183] The lower sound-insulating cover 214 has a two-layer structure consisting of an inner layer 200a and an outer layer 200b. The inner layer 200a is made of a fiber with excellent sound-absorbing properties. The outer layer 200b is made of a resin containing a rubber component with excellent sound-insulating properties. As a result, the lower sound-insulating cover 214 can prevent the sound of drainage from leaking outside the joint 210 as the drainage passes through the inside of the joint.

[0184] Furthermore, the lower sound-insulating cover 214 has a two-layer structure consisting of an inner layer 200a and an outer layer 200b. This makes it possible to prevent gaps from forming between the filler M and the lower sound-insulating cover 214 when the filler M filled in the through-holes H of the floor slab S dries and thins. The inner layer 200a and the outer layer 200b may contain expanded graphite. This makes it possible to more appropriately prevent gaps from forming between the filler M and the lower sound-insulating cover 214.

[0185] Furthermore, the outer surface of the outer layer 200b of the lower sound-insulating cover 214 may be uneven. By forming the outer surface of the outer layer 200b with unevenness, the adhesive strength of the filler M to the outer surface of the outer layer 200b can be increased. This makes it possible to prevent gaps from being generated between the filler M and the lower sound-insulating cover 214.

[0186] The collective joint 210 may also be provided with a fiber mortar layer (not shown) covering the lower sound-insulating cover 214. By providing the fiber mortar layer on the lower sound-insulating cover 214, the fiber mortar layer can be disposed in the through-hole H. Therefore, the fiber mortar layer can improve fire resistance. Furthermore, the adhesive strength of the filler M to the outer surface of the mortar layer can be increased. This can prevent voids from forming between the filler M and the mortar layer. Providing a fiber mortar layer on the collective joint 210 increases the weight of the collective joint 210. Therefore, in consideration of the workability of the collective joint 210, it is preferable to set the thickness of the fiber mortar layer to 10 mm or less. In the fourth embodiment, an example in which the entire lower sound-insulating cover 14 is covered with a fiber mortar layer will be described. However, a fiber mortar layer may also be provided in a portion of the lower sound-insulating cover 214 corresponding to the through-hole H.

[0187] Furthermore, the slab thickness T of the floor slab S is set to 150 mm or more. Therefore, for example, at least the upper half of the tapered portion 293 can be placed in the through hole H of the floor slab S. This allows, for example, at least the upper half of the tapered portion 293 to be placed in the through hole H. In this state, by setting the inclination angle θ13 of the tapered portion 293 to be 80° or more and 85° or less, the tapered shape of the tapered portion 293 is transferred to the filler M, and the inner surface of the filler M also becomes tapered. Therefore, for example, the inclination of the inner surface of the filler M can suppress the falling off of residue of the fireproof material 212 generated by the flames on the floor below F2.

[0188] Furthermore, the inclined portion 330 of the lower sound-insulating cover 114 that covers the tapered portion 193 can be placed in the through-hole H. In this state, by setting the inclination angle θ16 of the inclined portion 330 to be equal to or greater than 70° and equal to or less than 89°, the tapered shape of the inclined portion 330 is transferred to the filler M, and the inner surface of the filler M also becomes tapered. Therefore, for example, the inclination of the inner surface of the filler M can prevent residue of the fire-resistant material 212 generated by the flames on the floor below F2 from falling off.

[0189] Furthermore, the thermal expansion coefficient of the fire-resistant material 212 may be 1.3 times or more and 100 times or less. At least the lower half of the fire-resistant material 212 is disposed, for example, in the through-hole H in the floor slab S. Therefore, it is possible to prevent the generation of voids in the through-hole H due to thermal expansion of the fire-resistant material 212. This allows the through-hole H to be appropriately blocked with the fire-resistant material 212.

[0190] Furthermore, the slab thickness T of the floor slab S may be less than 100 mm. In this state, the thermal expansion coefficient of the fire-resistant material 212 can be set to 1.3 times or more and 100 times or less. Therefore, it is possible to prevent the thermal expansion of the fire-resistant material from causing voids in the through-holes H where the slab thickness T is less than 100 mm. As a result, when the slab thickness T of the floor slab S is kept to less than 100 mm, the through-holes H can be appropriately blocked with the fire-resistant material 212.

[0191] Here, for example, by installing the manifold joint 210 using a branch-floating construction, the horizontal pipe connection portion 221 is positioned in a state where it is raised by the branch height H1 from the floor slab S. Furthermore, the fire-resistant material 212 has a height H2 of more than 150 mm (e.g., 210 mm). Therefore, with the horizontal pipe connection portion 221 raised by the branch height H1, for example, at least the lower half of the fire-resistant material 212 can be placed in the through-hole H. This allows the fire-resistant material 212 to expand when a fire breaks out on the floor F2 below the floor slab S and the area around the floor slab S and the through-hole H is heated by the flames and smoke. Therefore, the expanded fire-resistant material 212 can block the through-hole H. As a result, the flames and smoke from the floor F2 below can be prevented from spreading to the floor F1 above, thereby enabling the fire-resistant performance of the fire-resistant material 212 to be fully realized.

[0192] Furthermore, a fireproof sheet 310 is used as the fireproof material 212. Therefore, for example, the height H2 of the fireproof material 212 can be selected arbitrarily. This allows the height H2 of the fireproof material 212 to be appropriately adjusted to the height required at the construction site, for example.

[0193] Furthermore, it is preferable that the height H2 of the fire-resistant material 212 is made higher than the intermediate pipe 232. By making the height H2 of the fire-resistant material 212 higher than the intermediate pipe 232, a large amount of fire-resistant material 212 can be secured to be placed in the through-hole H. Therefore, when a fire breaks out on the floor F2 below in the floor slab S, the fire-resistant material 212 can be expanded to properly block the through-hole H. This allows the fire-resistant material 212 to prevent flames and smoke on the floor F2 below from spreading to the floor F1 above.

[0194] Furthermore, the lower end 213a of the upper sound-insulating cover 213 and the upper end 214a of the lower sound-insulating cover 214 are fixed to the outer surface of the socket 261 of the intermediate pipe 232 with fixing tape 215, and the fixing tape 215 is disposed at the upper end 214a of the lower sound-insulating cover 214. Furthermore, the upper end of the fixing tape 215 can be disposed at the top of the horizontal pipe junction 236. Therefore, for example, the fixing tape 215 can be disposed at a height equal to or greater than half the slab thickness T of the floor slab S. Alternatively, when the collective joint 210 is installed with a raised branch, the fixing tape 215 can be disposed above the floor slab S (i.e., at a position higher than the floor slab S). This allows the floor slab S to prevent damage to the fixing tape 215 due to a fire on the floor F2 below the floor slab S, for example. Therefore, smoke on the floor F2 below can be prevented from transmitting to the floor F1 above, thereby achieving the fire resistance performance of the collective joint 210.

[0195] Here, a horizontal pipe connection portion 221 is provided on the upper connection pipe 230 of the vertical pipe connection portion 220. The horizontal pipe connection portion 221 is arranged above the floor slab S. Therefore, the upper sound-insulating cover 213 covering the upper connection pipe 230 can be arranged above the floor slab S, for example, when a collective joint is installed with the branches raised. This makes it possible to arrange the fixing tape 215 above the floor slab S. As a result, the floor slab S can prevent the fixing tape 215 from being damaged by flames on the floor below F2, for example.

[0196] Furthermore, the collective joint 210 is disposed in the through-hole H of the floor slab S. As a result, by disposing the fixing tape 215 at the upper end 214a of the lower sound-insulating cover 214, the floor slab S can prevent the fixing tape 215 from being damaged by flames on the floor below F2, for example.

[0197] Furthermore, the fixing tape 215 is arranged at a height of at least half the slab thickness T of the floor slab S. This allows the floor slab S to prevent the fixing tape 215 from being damaged by flames on the floor below F2, for example.

[0198] In addition, the fixing tape 215 is disposed above the upper surface of the floor slab S. This allows the floor slab S to prevent the fixing tape 215 from being damaged by flames on the floor below F2, for example.

[0199] The lower end 252a of the vertical rib 252 is positioned within a first allowable height range of 25 mm or less, with the lower end 226a of the opening 226 in the horizontal pipe connecting portion 221 being the lowest position. This prevents the vertical rib 252 from obstructing the flow of wastewater from the opening 226 of the horizontal pipe connecting portion 221 to the vertical pipe connecting portion 220. This improves the drainage performance from the opening 226 of the horizontal pipe connecting portion 221 to the vertical pipe connecting portion 220.

[0200] Here, for example, a first swirl vane 248 is provided on the inner surface of the vertical pipe connection portion 220. Therefore, it is conceivable that wastewater that bounces off the first swirl vane 248 will fly into the horizontal pipe connection portion 221 and flow back. Therefore, the lower end 252a of the vertical rib 252 is kept within the first allowable range and is not positioned above the first allowable range. This makes it possible to prevent, for example, wastewater that bounces off the first swirl vane 248 inside the vertical pipe connection portion 220 from flying through the opening 226 into the horizontal pipe connection portion 221 and flowing back.

[0201] Furthermore, the lower end 252a of the vertical rib 252 may be located within a second allowable height range, which is equal to or greater than the lower end 226a of the opening 226 and equal to or less than the axis O12 of the horizontal bush 225. Generally, the water level of the horizontal pipe P3 inserted into the horizontal bush 225 is equal to or less than the axis O12. Therefore, the vertical rib 252 does not obstruct the flow of wastewater from the opening 226 of the horizontal pipe connecting portion 221 to the vertical pipe connecting portion 220. This improves the drainage performance from the opening 226 of the horizontal pipe connecting portion 221 to the vertical pipe connecting portion 220. Furthermore, by locating the lower end 252a of the vertical rib 252 within the second allowable height range, it is possible to prevent, for example, wastewater that has bounced off the first swirl vane 248 inside the vertical pipe connecting portion 220 from jumping into the horizontal pipe connecting portion 221 from the opening 226 and flowing back.

[0202] Here, when injection molding the vertical pipe connecting portion 220, a first molding die is opened upward from the lower ends 252a of the plurality of vertical ribs 252, and a second molding die is opened downward from the lower ends 252a of the plurality of vertical ribs 252. Therefore, a first draft slope is formed on the inner surface of the upper connecting pipe 230 from the lower ends 252a of the plurality of vertical ribs 252 upward, and a second draft slope is formed from the lower ends 252a of the plurality of vertical ribs 252 downward. Therefore, the inner diameter of the inner surface of the vertical pipe connecting portion 220 is smallest at the lower ends 252a of the plurality of vertical ribs 252.

[0203] Furthermore, a plurality of fire-resistant sheets 312, 314 are arranged (attached) as the fire-resistant material 212 on the outer surfaces of the socket 261 of the intermediate pipe 232, the straight pipe section 260 of the intermediate pipe 232, the socket 291 of the lower connecting pipe 233, and the connecting pipe section 292 of the lower connecting pipe 233. This allows the outer surfaces to be covered with the fire-resistant material 212 formed from the plurality of fire-resistant sheets 312, 314. By using a plurality of fire-resistant sheets 312, 314 as the fire-resistant material 12, the width of the fire-resistant sheets 312, 314 can be made narrower than that of a single fire-resistant sheet. This prevents wrinkles from forming in the fire-resistant material 212 covering the outer surfaces of the socket 261 of the intermediate pipe 232, the straight pipe section 260 of the intermediate pipe 232, the socket 291 of the lower connecting pipe 233, and the connecting pipe section 292 of the lower connecting pipe 233.

[0204] Here, for example, when adjacent fire-resistant sheets 312, 314 are arranged with a gap between them, a recess formed radially inward between the adjacent fire-resistant sheets 312, 314. The outer surface of the fire-resistant material 212 is covered with the lower sound-insulating cover 214. Therefore, in the recess between the adjacent fire-resistant sheets 312, 314, the lower sound-insulating cover 214 may be recessed radially inward, which may result in a decrease in sound-insulating performance.

[0205] Therefore, adjacent fire-resistant sheets 312, 314 are overlapped or butted together in the plurality of fire-resistant sheets 312, 314. This makes it possible to prevent the plurality of fire-resistant sheets 312, 314 from creating unevenness on the outer surface of the fire-resistant material 212. This makes it possible to prevent the lower sound-insulating cover 214 from being depressed radially inward, ensuring sound-insulating performance.

[0206] Furthermore, a plurality of fire-resistant sheets 312 are arranged in the circumferential direction on the outer surfaces of the socket 261 of the intermediate pipe 232, the straight pipe section 260 of the intermediate pipe 232, the socket 291 of the lower connecting pipe 233, and the connecting pipe section 292 of the lower connecting pipe 233. Here, the joint body 211 is rotatable about the axis O11 when arranging the plurality of fire-resistant sheets 312. As a result, for example, by rotating the joint body 211, the plurality of fire-resistant sheets 312 can be arranged by being appropriately wrapped around the outer surfaces of the socket 261 of the intermediate pipe 232, the straight pipe section 260 of the intermediate pipe 232, the socket 291 of the lower connecting pipe 233, and the connecting pipe section 292 of the lower connecting pipe 233.

[0207] Furthermore, like the multiple fire-resistant sheets 314 in Modification 1, the multiple fire-resistant sheets 314 may be arranged in the direction of the axis O11 on the outer surfaces of the socket 261 of the intermediate pipe 232, the straight pipe section 260 of the intermediate pipe 232, the socket 291 of the lower connecting pipe 233, and the connecting pipe section 292 of the lower connecting pipe 233. This allows the multiple fire-resistant sheets 314 to be appropriately arranged on the outer surfaces of the socket 261 of the intermediate pipe 232, the straight pipe section 260 of the intermediate pipe 232, the socket 291 of the lower connecting pipe 233, and the connecting pipe section 292 of the lower connecting pipe 233, for example, when the fitting body 211 is fixed.

[0208] Furthermore, in the construction method of the manifold 210, a plurality of fire-resistant sheets 312, 314 are arranged on the outer surfaces of the socket 261 of the intermediate pipe 232, the straight pipe section 260 of the intermediate pipe 232, the socket 291 of the lower connecting pipe 233, and the connecting pipe section 292 of the lower connecting pipe 233. At this time, adjacent fire-resistant sheets 312, 314 are overlapped or butted together. In this way, the plurality of fire-resistant sheets 312, 314 form the fire-resistant material 212 that covers the outer surfaces of the socket 261 of the intermediate pipe 232, the straight pipe section 260 of the intermediate pipe 232, the socket 291 of the lower connecting pipe 233, and the connecting pipe section 292 of the lower connecting pipe 233.

[0209] By using a plurality of fire-resistant sheets 312, 314 as the fire-resistant material 212, the width of the fire-resistant sheet 310 can be narrower than when the fire-resistant material 212 is a single fire-resistant sheet. This makes it possible to prevent wrinkles from forming in the fire-resistant material 212 that covers the outer surfaces of the socket 261 of the intermediate pipe 232, the straight pipe section 260 of the intermediate pipe 232, the socket 291 of the lower connecting pipe 233, and the connecting pipe section 292 of the lower connecting pipe 233.

[0210] Furthermore, in the construction method of the manifold joint 210, by wrapping multiple fireproof sheets 312 circumferentially, the seams at both ends of each fireproof sheet 312 can be used as positioning portions (not shown). Therefore, the upper connecting pipe 230 and the lower connecting pipe 233 connected to the intermediate pipe 232 can be positioned circumferentially based on the positioning portions. This allows the third swirl vane 300 of the lower connecting pipe 233 to be positioned circumferentially relative to the first swirl vane 248 of the upper connecting pipe 230. This facilitates construction to connect the upper connecting pipe 230, intermediate pipe 232, and lower connecting pipe 233 of the vertical pipe connection portion 220.

[0211] Furthermore, by overlapping or butting the plurality of fire-resistant sheets 314 in the circumferential direction in Modification 1, at least one of the seams between adjacent fire-resistant sheets 314 can be used as a positioning portion (not shown). Therefore, the upper connecting pipe 230 and the lower connecting pipe 233 connected to the intermediate pipe 232 can be positioned in the circumferential direction based on the positioning portion. This allows the third swirl vane 300 of the lower connecting pipe 233 to be positioned in the circumferential direction relative to the first swirl vane 248 of the upper connecting pipe 230. This facilitates the construction of connecting the upper connecting pipe 230, the intermediate pipe 232, and the lower connecting pipe 233 of the vertical pipe connecting portion 220.

[0212] In addition, thickened portions 265, 274 are provided on the straight pipe portions 260, 273 of the intermediate pipes 232, 272. Furthermore, the outer surfaces of the straight pipe portions 260, 273 are flush with the outer surfaces of the sockets 261 of the intermediate pipes 232, 272, the socket 291 of the lower connecting pipe 233, and the connecting pipe portion 292 of the lower connecting pipe 233. Therefore, the fire-resistant sheets 310, 312, 314 that form the fire-resistant material 212 can be attached flatly to the outer surfaces of the intermediate pipes 232, 272, the socket 291 of the lower connecting pipe 233, and the connecting pipe portion 292 of the lower connecting pipe 233, using the thickened portions 265, 274. This prevents wrinkles from forming in the fire-resistant material 212 covering the outer surfaces of the intermediate pipes 232 and 272, the outer surface of the socket 291 in the lower connecting pipe 233, and the outer surface of the connecting pipe portion 292 of the lower connecting pipe 233.

[0213] Furthermore, the thick-walled portion 265 of the intermediate pipe 232 is formed as a protruding portion 265 that protrudes radially outward from the side surface of the straight pipe portion 260. This reduces the thick-walled portion of the straight pipe portion 260. This prevents sink marks and the like from occurring in the straight pipe portion 260 when the intermediate pipe 232 is injection molded, thereby improving the injection moldability of the intermediate pipe 232.

[0214] Furthermore, at least one of a first rib 265a extending in the circumferential direction and a second rib 265b extending in the direction of the axis O11 is provided as the protrusion 265. Therefore, ribs can be provided over the entire side surface of the straight pipe section 260. This makes it possible to appropriately prevent wrinkles from occurring in the fireproof material 212 covering the outer surface of the intermediate pipe 232, the outer surface of the socket 291 in the lower connecting pipe 233, and the outer surface of the connecting pipe section 292 of the lower connecting pipe 233.

[0215] Furthermore, like the intermediate pipe 272 according to Modification 1, the entire periphery of the straight pipe section 273 of the intermediate pipe 272 may be made to have a constant thickness by the thick-walled section 274. Therefore, the outer surface of the entire periphery of the straight pipe section 273 can be made flush with the outer surface of the socket 261 of the intermediate pipe 272, the outer surface of the socket 291 of the lower connecting pipe 233, and the outer surface of the connecting pipe section 292 of the lower connecting pipe 233. This makes it possible to appropriately prevent wrinkles from occurring in the fire-resistant material 212 covering the outer surface of the intermediate pipe 272, the outer surface of the socket 291 of the lower connecting pipe 233, and the outer surface of the connecting pipe section 292 of the lower connecting pipe 233.

[0216] Furthermore, as in the intermediate pipe 282 according to the second modification, grooves 286 are provided on the inner surface of the straight pipe portion 283 of the intermediate pipe 282. This allows the thickness of the straight pipe portion 283 to be reduced at intervals in the circumferential direction. This makes it possible to suppress the occurrence of sink marks or the like in the straight pipe portion 283 when the intermediate pipe 282 is injection molded, thereby improving the injection moldability of the intermediate pipe 282.

[0217] Next, a fifth to seventh embodiment will be described with reference to Figures 43 to 49. In the fifth to seventh embodiments, the same or similar members as those in the floor structure of the fourth embodiment will be denoted by the same reference numerals, and detailed description thereof will be omitted.

[0218] Fifth Embodiment As shown in FIG. 43, in the fifth embodiment, the blade unit 231 of the fourth embodiment is replaced with a blade unit 350. Like the blade unit 231 of the fourth embodiment, the blade unit 350 of the fifth embodiment is fitted to the upper end of the upper connecting pipe 230 of the vertical pipe connecting portion 220. The blade unit 350 includes a unit main body 351, a seal member 241, and a press member 242. The unit main body 351 includes an upper vertical pipe connecting portion 245, a blade support portion 352, a first swirl vane 353, and a plurality of reinforcing ribs 354. The blade support portion 352, the first swirl vane 353, and the plurality of reinforcing ribs 354 are disposed inside the upper connecting pipe 230 of the vertical pipe connecting portion 220. The upper vertical pipe connection portion 245, the blade support portion 352, the first swirl blade 353, and the plurality of reinforcing ribs 354 of the unit body 351 are integrally formed from vinyl chloride resin or the like.

[0219] As shown in Figures 43 to 47, the upper vertical pipe connecting portion 245 has a protrusion 245a. The protrusion 245a protrudes radially outward from the outer surface of the upper vertical pipe connecting portion 245. The protrusion 245a engages with the recess 237 of the upper connecting pipe 230, thereby positioning the unit body 240 (specifically, the first swirl vane 248) circumferentially relative to the upper connecting pipe 230. The blade support portion 352 extends downward from a portion of the circumferential direction at the lower end of the upper vertical pipe connecting portion 245. The blade support portion 352 is formed in a curved, flat plate shape and has an arc shape when viewed in the vertical direction. The blade support portion 352 extends in the vertical direction. In other words, the circumferential length of the blade support portion 352 is approximately constant regardless of its vertical position.

[0220] The first swirl vane 353 is provided on the inner surface (surface facing radially inward) of the blade support portion 352. The upper surface 353a of the first swirl vane 353 protrudes radially inward from the blade support portion 352 at an inclination angle θ17 of 90°. The upper surface 353a of the first swirl vane 353 is inclined at an inclination angle θ18 of 55° so as to gradually slope downward in the circumferential direction toward the first side X1. The inclination angle θ18 is the angle of inclination from one side portion 352a of the blade support portion 352 to the other side portion 352b with respect to a plane perpendicular to the axis O11.

[0221] 43, the first swirl vane 353 comes into contact with the wastewater in the upper connecting pipe 230 at the vertical pipe connecting portion 220, thereby making it easier for the wastewater to stagnate locally near the first swirl vane 353. This significantly improves the drainage capacity in the upper connecting pipe 230.

[0222] As shown in Figures 44 and 45, a plurality of reinforcing ribs 354 are provided on the underside 353b of the first swirl vane 353. The reinforcing ribs 354 extend from the blade support portion 352 to the outer edge 353c of the first swirl vane 353 on the underside 353b of the first swirl vane 353. The reinforcing ribs 354 can suppress vibrations of the blade support portion 352 and the first swirl vane 353. The reinforcing ribs 354 form a vibration suppression portion 356. In other words, the vibration suppression portion 356 has a vibration suppression function for the blade support portion 352 and the first swirl vane 353.

[0223] 48 , in the sixth embodiment, a portion of the vertical pipe connecting portion 220 is made to contain thermally expandable graphite, and the portion of the vertical pipe connecting portion 220 is configured as a fire-resistant pipe 360. Specifically, in the sixth embodiment, for example, the fire-resistant material 212 and the intermediate pipe 232 of the fourth embodiment are replaced with the fire-resistant pipe 360. In the sixth embodiment, an intermediate pipe is used as an example of a portion of the vertical pipe connecting portion 220, but the portion of the vertical pipe connecting portion 220 is not limited to being an intermediate pipe.

[0224] The fire-resistant pipe 360 ​​also serves as an intermediate pipe connected between the upper connecting pipe 230 and the lower connecting pipe 233 in the direction of the axis O11. That is, the intermediate pipe constitutes the fire-resistant pipe 360. The fire-resistant pipe 360 ​​has, for example, the same shape as the intermediate pipe 232 of the fourth embodiment. That is, the fire-resistant pipe 360 ​​is manufactured, for example, by injection molding a resin composition. The fire-resistant pipe 360 ​​has, for example, a straight pipe portion 361, a socket 362, and a spigot 363. The height of the fire-resistant pipe 360 ​​is preferably greater than 150 mm and equal to or less than 300 mm.

[0225] The fire-resistant pipe 360 ​​contains thermally expandable graphite. Furthermore, the fire-resistant pipe 360 ​​may have a single-layer structure made of a resin composition containing 1 to 20 parts by weight of thermally expandable graphite per 100 parts by weight of polyvinyl chloride resin. Alternatively, the fire-resistant pipe 360 ​​may have a three-layer structure made of a thermally expandable fire-resistant layer made of a resin composition containing 1 to 20 parts by weight of thermally expandable graphite per 100 parts by weight of polyvinyl chloride resin, and coating layers made of a polyvinyl chloride resin composition that does not contain thermally expandable graphite that cover the inner and outer surfaces of the thermally expandable fire-resistant layer.

[0226] According to the fire-resistant pipe 360 ​​of the sixth embodiment described above, the intermediate pipe constituting part of the vertical pipe connection section 220 is the fire-resistant pipe 360. That is, the intermediate pipe also serves as the fire-resistant pipe 360. Furthermore, the height of the fire-resistant pipe 360 ​​is ensured to exceed 150 mm. Therefore, in a branch-floating construction state in which the horizontal pipe connection section 221 is raised above the floor slab S, a large fire-resistant pipe 360 ​​can be placed in the through-hole H. This allows the fire-resistant pipe 360 ​​to expand when a fire breaks out on the floor below F2 of the floor slab S and the area around the floor slab S or the through-hole H is heated by the flames and smoke. Therefore, the expanded fire-resistant pipe 360 ​​can block the through-hole H. As a result, the flames and smoke from the floor below F2 can be prevented from spreading to the floor above F1, thereby achieving the fire-resistant performance of the fire-resistant pipe 360.

[0227] Furthermore, by using the intermediate pipe that constitutes part of the vertical pipe connection portion 220 as the fire-resistant pipe 160, there is no need to attach a fire-resistant material to the outer surface of the joint body 11. This allows the outer diameter of the joint assembly 210 to be kept small.

[0228] Furthermore, the intermediate pipe constituting the fire-resistant pipe 360 ​​has the same shape as, for example, the intermediate pipe 232 of the fourth embodiment. Therefore, the fire-resistant pipe 360 ​​is provided at a position that avoids the first swirl vane 248, the plurality of longitudinal ribs 252, and the third swirl vane 300. This prevents the first swirl vane 248, the longitudinal ribs 252, and the third swirl vane 300 from interfering with the thermal expansion of the fire-resistant pipe 360.

[0229] Seventh Embodiment As shown in Figure 49, in the seventh embodiment, the connection is made by fitting the socket 291 of the lower connecting pipe 233 into the lower connecting portion (horizontal pipe junction) 236 of the upper connecting pipe 230 in the vertical pipe connecting portion 220, and a fire-resistant material 380 is provided on the lower connecting pipe 233. In this embodiment, no intermediate pipe is provided. The fire-resistant material 380 is the same as the fire-resistant material 212 in the fourth embodiment. The fire-resistant material 380 is, for example, arranged and attached to the outer surface of the connecting pipe portion 292 of the lower connecting pipe 233. It is preferable that the height of the fire-resistant material 380 be greater than 150 mm.

[0230] In the seventh embodiment, an example will be described in which the fire-resistant material 380 is disposed on the outer surface of the coupling pipe portion 292 of the lower connecting pipe 233, but this is not limiting. As another example, for example, the fire-resistant material 380 may be disposed continuously on both the lower connecting portion 236 of the upper connecting pipe 230 and the lower connecting pipe 233.

[0231] The technical scope of the present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the spirit of the present invention.

[0232] In the above embodiment, an example has been described in which the height H2 of the fire-resistant material 212 is greater than 150 mm and equal to or less than 300 mm, but the height H2 of the fire-resistant material 12 is not limited to greater than 150 mm and equal to or less than 300 mm. In the above embodiment, an example has been described in which the height H2 of the fire-resistant material 212 is preferably greater than the height of the intermediate pipe 232, but this is not limited to this. In the above embodiment, an example has been described in which the fixing tape 215 is disposed at a height equal to or greater than half the slab thickness T of the floor slab S, but this is not limited to this. In the above embodiment, an example has been described in which the fixing tape 215 is disposed above the upper surface of the floor slab S, but this is not limited to this.

[0233] In the above embodiment, an example has been described in which the lower ends 252a of the multiple vertical ribs 252 are arranged within a first allowable height range that is equal to or greater than the lower end 226a of the opening 226 in the horizontal pipe connecting portion 221 and equal to or less than 25 mm from the lower end 226a of the opening 226, but this is not limited to this. In the above embodiment, an example has been described in which the lower ends 252a of the vertical ribs 252 are arranged within a second allowable height range that is equal to or greater than the lower end 226a of the opening 226 in the horizontal pipe connecting portion 221 and equal to or less than the axis O12 of the horizontal bush 225, but this is not limited to this. In the above embodiment, an example has been described in which the lower ends 252a of the multiple vertical ribs 252 are arranged at the same height in the direction of the axis O11, but this is not limited to this.

[0234] In the above embodiment, an example has been described in which the thick-walled portions 265, 274 are provided in the straight pipe portions 260, 273 of the intermediate pipes 232, 272 so that the outer surfaces of the straight pipe portions 260, 273 are flush with the socket 261 of the intermediate pipe 232 and the socket 291 of the lower connecting pipe 233, but this is not limitative. The straight pipe portions 260, 273 of the intermediate pipes 232, 272 do not necessarily have to be provided with the thick-walled portions 265, 274. In the above embodiment, the thick-walled portion (protruding portion) 265 of the straight pipe portion 260 is described as a first rib 265a extending in the circumferential direction and a second rib 265b extending in the axial direction, but the extending directions of the first rib 265a and the second rib 265b can be selected arbitrarily.

[0235] In addition, the components in this embodiment can be replaced with well-known components as appropriate, without departing from the spirit of the present invention.

[0236] Eighth Embodiment Next, an eighth embodiment of the present invention will be described with reference to Fig. 50. The same parts as those in the previous embodiment are designated by the same reference numerals, and their description will be omitted, with only the differences being described. As shown in Fig. 50, for example, a drainage pipe 500 having the collective joint 210 of the fourth embodiment is provided in a building 410. The collective joint 210 is supported below the through hole H in the floor slab S by a support bracket 420. In addition to the through hole H, a second through hole H10 is formed in the floor slab S.

[0237] A pipe space S15 is formed between two walls S10, S11 extending downward from the floor slab S. The assembly joint 210 is disposed in the pipe space S15. Through holes S10a, S11a are formed in the walls S10, S11, respectively. The wall S10 is disposed at a position along the horizontal plane between the through hole H and the second through hole H10. For example, the walls S10, S11 are formed of concrete.

[0238] The lower end of a first vertical pipe P1 is connected to the vertical pipe connection portion 220 of the collective joint 210. The first vertical pipe P1 extends to the upper floor F1 through the through hole H. A filler material M is filled between the outer surface of the first vertical pipe P1 and the opening periphery of the through hole H in the floor slab S. A first end of a horizontal pipe P3 and a first end of a horizontal pipe P3A are connected to the multiple horizontal pipe connection portions 221 of the collective joint 210. The horizontal pipe P3 extends along the horizontal plane. The horizontal pipe P3 passes through the through hole S11a in the wall S11. A filler material M is filled between the outer surface of the horizontal pipe P3 and the opening periphery of the through hole S11a in the wall S11.

[0239] For example, the horizontal pipe P3A includes a first pipe P3B and a second pipe P3C. A first end of the first pipe P3B is connected to the horizontal pipe connection portion 221 of the joint assembly 210. The first pipe P3B extends along a horizontal plane. The first pipe P3B passes through a through hole S10a in the wall S10. A filler material M is filled between the outer surface of the first pipe P3B and the peripheral opening edge of the through hole S10a in the wall S10. A first end of the second pipe P3C is connected to the second end of the first pipe P3B. The second pipe P3C extends upward from the first pipe P3B and passes through a second through hole H10 in the floor slab S. A filler material M is filled between the outer surface of the second pipe P3C and the peripheral opening edge of the second through hole H10 in the floor slab S. The second pipe P3C protrudes above the floor slab S (toward the floor F1). A drainage fixture 425 such as a bathtub is connected to the second end of the second pipe P3C.

[0240] The upper end of the second vertical pipe P2 is connected to the lower connecting pipe 233 of the manifold 210. A filler M is filled between the outer surface of the second vertical pipe P2 and the walls S10, S11. The first vertical pipe P1, the second vertical pipe P2, the horizontal pipe P3, and the horizontal pipe P3A can be made of vinyl chloride resin, polyethylene resin, polypropylene resin, or the like.

[0241] As described above, in this embodiment, the horizontal pipe P3 and the first pipe P3B of the horizontal pipe P3A are disposed below the floor slab S. The mass joint provided in the building 410 may be any of the mass joints of the first to seventh embodiments.

[0242] (Notes) (1) Aspect 1 of the present disclosure is a collective joint comprising: a joint body arranged with its axis aligned in the vertical direction; a blade support portion arranged on the inner peripheral surface of the joint body; a blade unit having swirl blades protruding radially inward from the blade support portion; and a vibration reduction portion provided on at least the blade support portion to reduce vibration of the blade support portion.

[0243] (2) Aspect 2 of the present disclosure may be the collective joint described in (1), in which the vibration reduction portion is provided on the joint body and the blade support portion, and the joint body and the blade support portion are fixed to each other by interference fit. (3) Aspect 3 of the present disclosure may be the collective joint described in (2), in which the vibration reduction portion is provided on the joint body and the blade support portion, and the joint body and the blade support portion are fixed to each other by interference fit in the radial direction.

[0244] (4) Aspect 4 of the present disclosure may be the collective joint described in (2), in which the vibration reduction portion fixes the joint body and the blade support portion to each other by the interference fit in the axial direction. (5) Aspect 5 of the present disclosure may be the collective joint described in (1), in which the vibration reduction portion is provided on the blade support portion and reinforces the blade support portion.

[0245] (6) A sixth aspect of the present disclosure may be the collective joint described in (5), in which the blade unit is connected to an end of the blade support part and has a body connection part that is attachable to the joint body, and the vibration reduction part protrudes in the circumferential direction from the circumferential end of the blade support part so as to be spaced apart from the blade support part, and is connected to the body connection part.

[0246] (7) Aspect 7 of the present disclosure may be the collective joint described in (6), which includes two vibration reduction portions, and the two vibration reduction portions each protrude in the circumferential direction from an end of the blade support portion in the circumferential direction. (8) Aspect 8 of the present disclosure may be the collective joint described in (6), in which an outer edge of the vibration reduction portion is formed in an arc shape when viewed in the radial direction so as to face the vibration reduction portion.

[0247] The mass joint can reduce noise generated by the liquid, and therefore has great industrial applicability.

[0248] 26 Joint body 53 Upper vertical pipe connection part (body connection part) 55 Blade support part 56 Swirl blade 81 Bonding part (vibration reduction part) 120, 120A, 120B, 120C, 120D, 150, 150A, 165, 165A, 165B, 165C Collective joint 51A, 121, 151, 151A, 166 Blade unit 124, 141, 147, 148, 153, 154 Vibration reduction part 139 Second blade support part 168A, 168B Reinforcement rib (second reinforcing part, reinforcing part) 175 Second bonding part (second vibration reduction part) O1 Axis

Claims

1. A joint assembly comprising: a joint body arranged with its axis aligned in the vertical direction; a blade support part arranged on the inner peripheral surface of the joint body; and a blade unit having swirl blades protruding radially inward from the blade support part; and a vibration reduction part provided on at least the blade support part, which reduces vibration of the blade support part.

2. A collective joint as set forth in claim 1, wherein the vibration reducing portion is provided on the joint body and the blade support portion, and the joint body and the blade support portion are fixed to each other by interference fit.

3. A collective joint according to claim 2, wherein the vibration reducing portion fixes the joint body and the blade support portion to each other by the radial interference fit.

4. A collective joint according to claim 2, wherein the vibration reducing portion fixes the joint body and the blade support portion to each other by the interference fit in the axial direction.

5. A joint assembly as described in claim 2, wherein the swirl vane is disposed at an end of the blade support part in the axial direction, the blade unit has a second blade support part disposed on the opposite side of the axial direction from the blade support part, with the swirl vane sandwiched between them, and a second vibration reducing part is provided which fixes the joint body and the second blade support part to each other by at least one of adhesive bonding, fitting, and interference fitting.

6. The assembly joint of claim 5, further comprising a second reinforcing portion connected to said swirl vane and said second vane support portion, respectively.

7. A joint assembly according to claim 6, wherein the second reinforcing portion is formed in the shape of a plate whose thickness direction is along the circumferential direction.

8. The assembly joint according to claim 1, wherein the vibration reducing portion is provided on the blade support portion and reinforces the blade support portion.

9. A collective joint as set forth in claim 8, wherein the blade unit has a body connecting part that is connected to an end of the blade support part and can be attached to the joint body, and the vibration reducing part protrudes in the circumferential direction from the circumferential end of the blade support part so as to be spaced apart from the blade support part, and is connected to the body connecting part.

10. A collective joint according to claim 9, comprising two vibration reducing portions, each of which protrudes in the circumferential direction from an end of the blade support portion in the circumferential direction.

11. A joint assembly as set forth in claim 9, wherein the outer edge of the vibration reducing portion is formed in an arc shape when viewed in the radial direction so as to face the vibration reducing portion.

Images