Manifold joints, piping structures, and buildings

Abstract

To provide a joint that suppresses the formation of wrinkles when fire-resistant material is placed. [Solution] The manifold joint 210 comprises a joint body 211 positioned such that its axis O11 is aligned in the vertical direction, and a projection 298 provided on the outer circumferential surface at the lower part of the joint body 211.

Description

Technical Field

[0001] The present invention relates to a manifold joint, a piping structure, and a building. Background Art

[0002] Conventionally, in buildings, for example, manifold joints are used to connect horizontal pipes through which drainage flows and vertical pipes (see, for example, Patent Document 1). Prior Art Documents Patent Documents

[0003] Patent Document 1 Japanese Unexamined Patent Application Publication No. 2019-112869 Summary of Invention Problems to be Solved by the Invention

[0004] The joint body of a manifold joint may be arranged in a through-hole of a floor slab of a building. When the manifold joint is formed of a synthetic resin such as vinyl chloride resin, it is necessary to arrange (wrap) a fire-resistant material on the radially outer side of the joint body in order to prevent the spread of fire during a building fire. However, if the fire-resistant material is arranged on the radially outer side of the joint body, wrinkles may be formed in the fire-resistant material. When wrinkles are formed in the fire-resistant material, the fire resistance performance of the fire-resistant material is reduced.

[0005] The present invention has been made in view of such problems, and an object thereof is to provide a manifold joint that suppresses the formation of wrinkles when a fire-resistant material is arranged, and a piping structure and a building provided with this manifold joint. Means for Solving the Problems

[0006] In order to solve the above problems, the present invention proposes the following means. (1) Embodiment 1 of the present invention is a manifold joint comprising a joint body arranged such that its axis is aligned in the vertical direction, and a projection provided on the outer circumferential surface at the lower part of the joint body.

[0007] In this invention, for example, a fire-resistant material is placed on the outer circumferential surface of the joint body, and the lower end of the fire-resistant material is placed on the radially outward-facing surface of the protruding portion. Then, for example, the upper end of the fire-resistant material and the joint body are fixed together with a fixing member such as tape, and the lower end of the fire-resistant material and the protruding portion are fixed together with a fixing member. As a result, the entire vertical portion of the fire-resistant material can be fixed to the manifold joint while being stretched vertically. Therefore, when fire-resistant material is placed in the joint, the formation of wrinkles can be suppressed.

[0008] (2) Embodiment 2 of the present invention is a piping structure comprising: a part of the joint body being positioned in a through-hole in a floor slab; a fire-resistant material covering at least a part of the outer circumferential surface of at least a part of the joint body and at least a part of the surface facing radially outward of the protrusion; and the lower end of the fire-resistant material being positioned on the surface of the protrusion. In this invention, a portion of the joint body is positioned in a through-hole in the floor slab, and at least a portion of the outer surface of the joint body and at least a portion of the surface of the protruding portion can be covered with fire-resistant material. In this case, since the lower end of the fire-resistant material is positioned on the surface of the protruding portion, for example, the protruding portion and the lower end of the fire-resistant material can be fixed together with a fixing member such as tape.

[0009] (3) Embodiment 3 of the present invention is a building comprising the piping structure described in (2) and the floor slab. This invention allows for the construction of a building with a manifold joint and piping structure that suppresses the formation of wrinkles when fire-resistant materials are placed. [Effects of the Invention]

[0010] In the manifold joint, piping structure, and building of the present invention, it is possible to suppress the formation of wrinkles when fire-resistant material is placed. [Brief explanation of the drawing]

[0011] [Figure 1] It is a front sectional view of the main part of a piping structure using the manifold joint according to the first embodiment of the present invention. [Figure 2] It is a front sectional view of the main part of a manifold joint in the first modification of the first embodiment of the present invention. [Figure 3] It is a front sectional view of the main part of a manifold joint in the second modification of the first embodiment of the present invention. [Figure 4] It is a front sectional view of the main part of a manifold joint in the third modification of the first embodiment of the present invention. [Figure 5] It is a front sectional view of the main part of a manifold joint in the fourth modification of the first embodiment of the present invention. [Figure 6] It is a perspective view of the main part of a manifold joint according to the second embodiment of the present invention. [Figure 7] It is a perspective view of the main part of a manifold joint in the first modification of the second embodiment of the present invention. [Figure 8] It is a front sectional view of the main part of a manifold joint according to the third embodiment of the present invention. [Figure 9] It is a cutaway perspective view of the main part of the same manifold joint. [Figure 10] It is a cutaway perspective view of the unit body of the same manifold joint as viewed from a predetermined direction. [Figure 11] It is a cutaway perspective view of the unit body of the same manifold joint as viewed from another direction. [Figure 12] It is a cutaway perspective view of the unit body of a manifold joint in the first modification of the third embodiment of the present invention. [Figure 13] It is a perspective view of the main part of the same unit body as viewed from another direction. [Figure 14] It is a perspective view of the unit body of a manifold joint in the second modification of the third embodiment of the present invention. [Figure 15] It is a cross-sectional view taken along cutting line A1-A1 in Figure 14. [Figure 16] It is a side view of the unit body of a manifold joint in the third modification of the third embodiment of the present invention. [Figure 17] It is a partially broken cross-sectional view of a floor structure including a manifold joint according to the fourth embodiment of the present invention. [Figure 18] It is a cross-sectional view of the floor structure of Fig.17, cut along the paper surface and viewed from the far side. [Figure 19] It is a cross-sectional view of the floor structure of Fig.17, cut along the paper surface and viewed from the near side. [Figure 20] It is a cross-sectional view of the joint body of Fig.19, cut along line A11-A11. [Figure 21] It is a front view showing the unit body included in the manifold joint according to the fourth embodiment. [Figure 22] It is a perspective view of the unit body of Fig.21 viewed from the back side. [Figure 23] It is a perspective view of the unit body of Fig.21, cut along line A12-A12. [Figure 24] It is a perspective view of the unit body of Fig.21, cut along line A13-A13. [Figure 25] It is a cross-sectional view showing the upper connection pipe and the horizontal pipe connection portion of Fig.19. [Figure 26] It is a cross-sectional view showing the upper connection pipe and the horizontal pipe connection portion of Fig.18. [Figure 27] It is a perspective view showing the intermediate pipe according to the fourth embodiment. [Figure 28] It is a perspective view of the intermediate pipe of Fig.27, cut along line A16-A16. [Figure 29] It is a partially broken perspective view of the intermediate pipe of Modification Example 1. [Figure 30] It is a partially broken perspective view of the intermediate pipe of Modification Example 2. [Figure 31] It is a front view showing the lower connection pipe provided in the manifold joint according to the fourth embodiment. [Figure 32] It is a cross-sectional view of the lower connection pipe of Fig.31, cut along the axis. [Figure 33] It is a bottom view of the lower connection pipe of Fig.31 viewed from the direction of arrow A19. [Figure 34] It is a side view showing the third swirl vane of Fig.32. [Figure 35]This is a cross-sectional view showing the joint according to the fourth embodiment installed on a 150 mm thick floor slab using a branch-floating construction method. [Figure 36] This is a cross-sectional view showing the joint according to the fourth embodiment installed in a 150 mm thick floor slab using normal construction methods. [Figure 37] This is a cross-sectional view showing the manifold joint according to the fourth embodiment installed on a 100 mm thick floor slab using a floating installation method. [Figure 38] This is a cross-sectional view showing the joint according to the fourth embodiment installed in a 100 mm thick floor slab using normal construction methods. [Figure 39] This is a cross-sectional view showing the joint assembly according to the fourth embodiment installed on a 75 mm thick floor slab using a branch-floating construction method. [Figure 40] This is a cross-sectional view showing the joint according to the fourth embodiment installed on a 75 mm thick floor slab using normal construction methods. [Figure 41] This is a side view of a manifold joint according to the fourth embodiment, equipped with a fire-resistant sheet. [Figure 42] This is a side view showing the fire-resistant sheet of Modification 1 attached to the joint. [Figure 43] This is a cross-sectional view showing a manifold coupling equipped with a blade unit according to a fifth embodiment of the present invention. [Figure 44] This is a cross-sectional view showing the main body of the unit in Figure 43. [Figure 45] Figure 44 is a perspective view of the unit body from below. [Figure 46] Figure 44 is a side view of the unit body as seen from the side. [Figure 47] Figure 44 is a perspective view of the unit body from above. [Figure 48] This is a cross-sectional view showing a manifold joint equipped with a fire-resistant pipe according to the sixth embodiment of the present invention. [Figure 49] This is a cross-sectional view showing a manifold joint according to the seventh embodiment of the present invention, in which a lower connecting pipe is connected to an upper connecting pipe and a fire-resistant material is provided. [Figure 50] This is a front view cross-sectional view of a building equipped with a manifold joint according to the eighth embodiment of the present invention. [Figure 51] This is a cross-sectional view showing a fractured portion of the manifold joint and fire-resistant material according to the fourth embodiment of the present invention. [Modes for carrying out the invention]

[0012] (First Embodiment) The following describes a piping structure in which the first embodiment of the manifold joint according to the present invention is used, with reference to Figures 1 to 4. In Figures 2 and subsequent figures, components other than the main parts of the manifold joint may be shown in a simplified or slightly different configuration. As shown in Figure 1, this piping structure 1 comprises a first vertical pipe 10, a second vertical pipe (not shown), a horizontal pipe 20, and the manifold joint 120 of this embodiment. In Figure 1, the first vertical pipe 10 and the horizontal pipe 20 are shown by dashed lines. Furthermore, in Figure 1, the shape of the unit body 122 in its natural state when no external force is acting on it is also shown by a dashed line.

[0013] The first vertical pipe 10, the second vertical pipe, and the horizontal pipe 20 are formed in a tubular shape using polyvinyl chloride resin or the like. The first vertical pipe 10 and the second vertical pipe extend along 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 is 15 degrees or less. The first vertical pipe 10 is positioned above the second vertical pipe.

[0014] In this specification, "vertical direction" merely refers to a direction that serves as a convenient reference when describing the shape of each part and component of the manifold joint according to the present invention. "Vertical direction" refers to the vertical direction when the manifold joint according to the present invention is used in a normal manner, but it does not restrict the direction in which the manifold joint according to the present invention is used.

[0015] The lower end of the manifold joint 120 on the upper floor is connected to the upper end of the first vertical pipe 10. The lower end of the second vertical pipe is connected to the upper end of the manifold joint 120 on the lower floor or to a leg joint (not shown). The horizontal pipe 20 is positioned along a horizontal plane while having a water slope. Drainage equipment is connected to the first end of the horizontal pipe 20.

[0016] The manifold joint 120 comprises a joint body 26, a horizontal pipe connection portion 47, and a vane 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 the common axis. Hereafter, the common axis will be referred to as axis O1. The direction along axis O1 will be referred to as the axis O1 direction. The direction perpendicular to axis O1 will be called the radial direction, and the direction that circles around axis O1 will be called the circumferential direction.

[0017] 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 formed in a cylindrical shape and is positioned on the axis O1. An opening (not shown in the reference numeral) is formed in the upper body 28 in the middle section in the vertical direction, penetrating the peripheral wall of the upper body 28. The number of openings formed in the upper body 28 is not limited. In this embodiment, since the upper body 28 of the joint body 26 is formed by injection molding, the inner circumferential surface 28c of the upper body 28 is inclined with respect to the axis O1. Specifically, the inner circumferential surface 28c is inclined so as it goes downwards, it gradually approaches the axis O1. Here, in a cross-section formed by a plane containing the axis O1, the angle between the axis O1 and the inner circumferential surface 28c is defined as θ1. For example, the angle θ1 is 1°.

[0018] The locking portion 29 is provided at the upper end of the portion of the inner circumferential surface of the upper body 28 that is below the opening. The locking portion 29 is formed in an annular shape and protrudes radially inward from the upper body 28. The radially inward-facing surface 29a of the locking portion 29 is inclined so as it extends downward, it gradually approaches the axis O1.

[0019] The vertical ribs 30 are provided on the inner circumferential surface of the upper body 28 and extend along 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 transverse ribs 31 are provided on the outer circumferential surface of the upper body 28, in the portion above the opening. The transverse ribs 31 extend along the circumferential direction. For example, the transverse ribs 31 are provided to hold the upper body 28. An annular sealing member 32 is positioned within the portion of the upper body 28 below the locking portion 29. The sealing member 32 locks onto the locking portion 29 from below.

[0020] The connecting pipe 37 is formed in a cylindrical shape and is positioned on the axis O1. The connecting pipe 37 is preferably made of a polyvinyl chloride resin and contains a resin composition that includes 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 of the resin composition. Furthermore, the connecting pipe 37 may be a single-layer structure made entirely of a resin composition, or it may be a multi-layer structure consisting of multiple layers. In the case of a multi-layer structure, it is sufficient if any of the layers are made of a resin composition. For example, if 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 made of a resin composition, and the surface layer, intermediate layer, and inner layer may contain a heat-absorbing agent. 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 the slab penetration holes of the floor slab (not shown).

[0021] As an example, a single-layer structure can be adopted, consisting 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 adopted, consisting 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 a coating layer of a polyvinyl chloride resin composition that does not contain thermally expandable graphite covering the inner and outer surfaces of this thermally expandable fire-resistant layer.

[0022] 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 it exceeds 20 parts by weight, it may expand too much due to heating, and the residue may fall out of the slab penetration hole without being able to maintain its shape, potentially reducing fire resistance.

[0023] When the connecting pipe 37 has a multilayer structure, the resin composition containing the heat-expandable refractory material is not particularly limited, but it is preferable to have a composition containing 1 to 20 parts by weight of heat-expandable graphite per 100 parts by weight of polyvinyl chloride resin. The content of heat-expandable graphite 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 extends throughout the entire slab penetration hole, even if the thermally expandable graphite content is relatively high at 15 parts by weight or more and the residue is brittle, the residue can block the entire slab penetration hole, retaining the thermally expanded residue within the floor slab and making it less likely to fall out. 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.

[0024] If the intermediate layer contains thermally expandable graphite, the intermediate layer will appear black. Therefore, it is preferable to include a coloring agent other than black in the surface layer and inner layer so that they can be distinguished from the intermediate layer. The thickness of the surface layer and the inner layer is preferably 0.3 mm to 3.0 mm, and preferably 0.6 mm to 1.5 mm. If the thickness of the coating layer is 0.3 mm or more, sufficient mechanical strength as a pipe can be ensured, and if it is 3.0 mm or less, a decrease in fire resistance can be suppressed. Furthermore, it is preferable that the connecting pipe 37 meets the performance requirements specified in JIS K6741. In other words, 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 of thermally expandable graphite exceeds 20 parts by weight, it may expand too much when heated, and the residue may fall out of the slab penetration holes without being able to maintain its shape, potentially reducing fire resistance.

[0025] As an example, the thermally expandable graphite used in this embodiment can be a crystalline compound obtained by acid treatment of powders such as natural scaly graphite, pyrolysis graphite, or quiche graphite with an inorganic acid and a strong oxidizing agent to insert the inorganic acid between the graphite layers, and then adjusting the pH. As inorganic acids, concentrated sulfuric acid, nitric acid, selenic acid, etc., can be used. As strong oxidizing agents, concentrated nitric acid, perchloric acid, perchlorate, permanganate, dichromate, hydrogen peroxide, etc., can be used.

[0026] By adjusting the pH as described above, it is possible to use crystalline compounds that maintain a layered carbon structure, such as thermally expandable graphite adjusted to a pH of 1.5 to 7.0, and thermally expandable graphite with a 1.3x expansion temperature of 180°C to 280°C.

[0027] If the pH of the thermally expandable graphite is below 1.5, it is too acidic and can easily cause corrosion of molding equipment, etc. If the pH exceeds 7.0, the carbonization-promoting effect of polyvinyl chloride resin will be diminished, and sufficient fire resistance may not be obtained. The particle size of the thermally expandable graphite is not particularly limited, but for example, a particle size in the range of 100 to 400 μm, preferably in the range of 120 to 350 μm, can be used.

[0028] 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, and thermoplastic elastomers, as needed, to the extent that they do not hinder the purpose of this embodiment.

[0029] The upper end of the connecting pipe 37 is positioned within the lower end of the upper body 28 of the upper joint body 27. The connecting pipe 37 is locked to the locking portion 29 of the upper body 28 from below via the 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 adhesive or the like.

[0030] The lower joint body is formed in a cylindrical shape. The lower joint body is made of polyvinyl chloride resin or the like. The lower end of the connecting pipe 37 is positioned inside 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 positioned so that its axis, axis O1, is aligned in the vertical direction.

[0031] The horizontal pipe connection portion 47 is formed in a cylindrical shape. The axis O2 of the horizontal pipe connection portion 47 is positioned along the horizontal plane. The horizontal pipe connection 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 connection part 47 are integrally constructed from polyvinyl chloride resin or the like.

[0032] The blade unit 121 is fitted onto the upper end of the joint body 26. The blade unit 121 includes a unit body 122, a sealing member 62, and a retaining member (not shown). The unit body 122 includes an upper vertical pipe connection part (body connection part) 53, a protruding part 54, a blade support part (first blade support part) 55, and a swivel blade 56.

[0033] The upper vertical pipe connection section 53 has a large-diameter section (not shown) and a small-diameter section (not shown). The large-diameter section and the small-diameter section are each formed in a cylindrical shape and are arranged on the axis O1. The inner and outer diameters of the large-diameter section are approximately the same as the inner and outer diameters of the upper body 28 of the upper joint body 27, respectively. The outer diameter of the small-diameter section is approximately the same as the inner diameter of the upper body 28 of the upper joint body 27. The small-diameter section is fixed to the inner circumferential surface of the lower end of the large-diameter section. The small-diameter section protrudes downward from the large-diameter section. The smaller diameter portion is fitted into 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 connection section 53 is attached to the joint body 26 with adhesive.

[0034] The projection 54 is provided on the inner circumferential surface of the lower end of the small-diameter portion of the upper vertical pipe connection portion 53, projecting radially inward. The projection 54 is formed in an annular shape and extends around the entire circumference of the small-diameter portion. The protruding portion 54 may be formed only on a portion of the circumferential direction. The blade support portion 55 extends downward from a part of the circumferential direction at the lower end of the small-diameter portion of the upper vertical pipe connection portion 53. In other words, the upper vertical pipe connection 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 when viewed in the vertical direction, it is formed in an arc shape. The blade support portion 55 extends in the vertical direction. That is, the circumferential length of the blade support portion 55 is substantially constant regardless of its position in the vertical direction.

[0035] The lower end of the blade support portion 55 gradually extends further downward as it approaches the first side (hereinafter simply referred to as the first side) D1 in the circumferential direction. Hereinafter, the side opposite to the first side D1 in the circumferential direction will be referred to as the second side (hereinafter simply referred to as the second side) D2 in the circumferential direction.

[0036] The swivel blade 56 is formed, for example, in the shape of a curved plate and is provided on the inner circumferential surface (the surface facing radially inward) of the lower end of the blade support portion 55. The swivel blade 56 protrudes radially inward from the blade support portion 55. The upper surface of the swivel blade 56 is inclined to gradually slope downward toward the first side D1. The upper vertical pipe connection portion 53, the protruding portion 54, the blade support portion 55, and the swivel blade 56 of the unit body 122 are integrally constructed from polyvinyl chloride resin or the like.

[0037] In this embodiment, since the unit body 122 is formed by injection molding, in its natural state, the outer circumferential surface 55c of the blade support portion 55 is inclined with respect to the axis O1. Specifically, the outer circumferential surface 55c is inclined so as it goes downwards, it gradually approaches the axis O1. Here, in a cross-section formed by a plane containing the axis O1, the angle between the axis O1 and the outer surface 55c is defined as θ2. For example, angle θ2 is 1° or less and angle θ1 or less.

[0038] For example, when the upper vertical pipe connection part 53 is attached to the joint body 26, the upper body 28 presses radially inward against the blade support part 55, causing the blade support part 55 to deform as shown by the solid line. The upper body 28 and the blade support part 55, which press radially against each other, constitute a vibration reduction part (fixed part) 124. The vibration reduction part referred to here means a configuration that reduces the vibration of the swivel blades compared to the bonding between the joint body and the vertical pipe connection part of the blade unit in Patent Document 1. The vibration reduction section 124 is provided on the upper body 28 (joint body 26) and the blade support section 55, and fixes the upper body 28 and the blade support section 55 to each other by radial interference fit. In this specification, interference fit means a fit that has a portion (reserve) left to tighten tightly. The vibration reduction section 124 reduces vibration of the blade support section 55.

[0039] The configuration of the sealing member 62 is not limited. The sealing member 62 is formed in a cylindrical shape and is arranged coaxially with the axis O1 on the radially inner side of the upper vertical pipe connection portion 53. The sealing member 62 is locked to the protrusion portion 54 from above the protrusion portion 54. The sealing member 62 is made of synthetic rubber or the like. The retaining member is formed in an annular shape and is positioned coaxially with axis O1. The retaining member is fitted into the large diameter portion of the upper vertical pipe connection 53. Furthermore, the blade unit 121 does not necessarily have to have a sealing member 62 and a retaining member.

[0040] The lower end of the first vertical pipe 10 is positioned within the sealing member 62, the retaining member, and the upper vertical pipe connection portion 53 of the vane unit 121, respectively. The lower end of the first vertical pipe 10 is locked to the protruding portion 54 of the unit body 122 from above the protruding portion 54 via the sealing member 62. The upper end of the second vertical pipe is positioned within the lower end of the lower joint body of the joint body 26. The second end of the horizontal pipe 20, opposite to the first end, is located within the horizontal pipe connection portion 47 of the manifold joint 25.

[0041] As described above, in the manifold joint 120 of this embodiment, for example, wastewater that flows into the joint body 26 through the first vertical pipe 10 connected to the joint body 26 strikes the swirling vane 56. Therefore, the wastewater can be made to flow downward through the joint body 26 while being swirled around the axis O1 by the swirling vane 56. This wastewater flows through the second vertical pipe and is treated in a wastewater treatment facility. In this process, the vibration reduction section 124 provided on the upper body 28 and the blade support section 55 reduces the vibration of the blade support section 55. Since the vibration reduction section 124 is provided on the blade support section 55, which is closer to the swivel blade 56 than the vertical pipe connection section in Patent Document 1, it can more effectively reduce the vibration of the swivel blade 56, which is the main source of noise, and thus reduce the noise generated by drainage.

[0042] The vibration reduction section 124 is provided on the upper body 28 and the blade support section 55, and fixes the upper body 28 and the blade support section 55 to each other by clamping. Therefore, the vibration reduction section 124 provided on the upper body 28 and the blade support section 55 can fix the upper body 28 and the blade support section 55 to each other by clamping. The vibration reduction section 124 is provided on the upper body 28 and the blade support section 55, and fixes the upper body 28 and the blade support section 55 to each other by radial clamping. Therefore, the vibration reduction section 124 can fix the upper body 28 and the blade support section 55 to each other by radial clamping.

[0043] The manifold joint 120 of this embodiment can be modified in various ways, as described below. As shown in Figure 2, in each configuration of the manifold 120 of the first embodiment, a blade unit 131 may be provided instead of the blade unit 121, as in the first modified manifold 120A. In this first modified example, a recess 28d is formed on the inner circumferential surface of the upper body 28 of the joint body 26, recessing radially outward. The recess 28d is formed in the upper body 28 in a range that roughly corresponds to the wing support portion 55 in the vertical direction. The recess 28d is formed only on a portion of the upper body 28 in the circumferential direction. In this first 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 with the axis O1 (they are not inclined with respect to the axis O1).

[0044] The blade unit 131 has a unit body 132 in place of the unit body 122 in each configuration of the blade unit 121. The unit body 132 has a protrusion 134 in addition to the components of the unit body 122. The protrusion 134 is provided on the outer circumferential surface of the blade support portion 55. In this example, the protrusion 134 is provided along approximately the entire length of the blade support portion 55 in the vertical direction. In its natural state, the radial length of the protrusion 134 is less than or equal to the radial length (depth) of the recess 28d. In its natural state, the vertical length of the protrusion 134 is slightly longer than the vertical length of the recess 28d.

[0045] Therefore, when the protrusion 134 is pushed into the recess 28d, the protrusion 134 presses against the upper end of the opening periphery of the recess 28d in the upper body 28 from below. The upper end of the opening periphery of the recess 28d in the upper body 28 and the protrusion 134, which press against each other in the vertical direction (axis O1 direction), constitute a vibration reduction section 136. Also, the protrusion 134 presses against the lower end of the opening periphery of the recess 28d in the upper body 28 from above. The lower end of the opening periphery of the recess 28d in the upper body 28 and the protrusion 134, which press against each other in the vertical direction (axis O1 direction), constitute a vibration reduction section 137. The vibration reduction sections 136 and 137 are fixed to each other by tightening the upper body 28 (joint body 26) and the blade support section 55 in the vertical direction (axis O1 direction).

[0046] As explained above, in the first modified example of the manifold joint 120A, the vibration reduction sections 136 and 137 fix the upper body 28 and the blade support section 55 to each other by tightening in the vertical direction. As a result, the vibration reduction sections 136 and 137 can fix the upper body 28 and the blade support section 55 to each other by tightening in the vertical direction. Therefore, noise generated by drainage can be reduced. The recess 28d and protrusion 134, formed only on a portion of the circumferential direction, allow for circumferential positioning of the unit body 132 relative to the joint body 26. Furthermore, a recess may be formed on the outer circumferential surface of the blade support portion 55, and a protrusion corresponding to this recess may be formed on the upper body 28.

[0047] As shown in Figure 3, in the configuration of the manifold 120 of the first embodiment, the unit body 52A of the blade unit 51A may be provided instead of the unit body 122 and vibration reduction section 124 of the blade unit 121, as in the second modified manifold 120B. The unit body 52A (blade unit 51A) has a second blade support portion (reinforcement plate) 139 in each component of the unit body 122. In this modified example, the swivel blade 56 is positioned at the lower end (the end in the direction of 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 when viewed in the vertical direction, it is formed in an arc shape. The second blade support portion 139 is positioned on the opposite side (downward) of the blade support portion 55 in the direction of axis O1, with the swivel blade 56 in between. The swivel blade 56 is positioned at the upper end of the second blade support portion 139.

[0048] The lower end of the second wing support portion 139 is in contact with the upper end of the surface 29a of the locking portion 29 from above this upper end. The upper surface of the locking portion 29 may be formed to conform to the horizontal plane. Furthermore, the lower end of the second wing support portion 139 may be made to easily contact the upper surface of the locking portion 29.

[0049] In the second modification, two vertical ribs 30 provided on the upper body 28 (joint 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 modification, 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 positioned 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. The two vertical ribs 30 and the blade support portions 55 and 139, which press against each other in the circumferential direction, constitute the vibration reduction portion (fixed portion) 141.

[0050] Here, of the two longitudinal ribs 30 arranged in the circumferential direction, the longitudinal rib 30 located on the first side D1 is also called longitudinal rib 30A, and the longitudinal rib 30 located on the second side D2 is also called longitudinal rib 30B. The vane support portion 55 presses against the vertical rib 30A from the second side D2. The second vane support portion 139 presses against the vertical rib 30B from the first side D1. The vibration reduction section 141 fixes the upper body 28 (joint body 26) and the blade support sections 55, 139 to each other by circumferential crimping via two longitudinal ribs 30.

[0051] As explained above, in the second modified manifold joint 120B, the vibration reduction section 141 fixes the upper body 28 and the blade support sections 55 and 139 to each other by circumferential clamping. Therefore, the vibration reduction section 141 can fix the upper body 28 and the blade support sections 55 and 139 to each other by circumferential clamping. As a result, noise generated by drainage can be reduced. The entire blade support section, including the blade support section 55 and the second blade support section 139, may also constitute the blade support section.

[0052] The third modified manifold 120C shown in Figure 4 includes an adhesive portion 146 in addition to the components of the first modified manifold 120A. Note that the swivel vane 56 is not shown in Figure 4. In the third modified example, the recess 28d is not formed in the upper body 28. The protrusion 134 is formed only on the lower end of the outer circumferential surface of the wing support portion 55.

[0053] The adhesive portion 146 is positioned above the protrusion 134 on the outer circumferential surface of the blade support portion 55. A known adhesive for bonding polyvinyl chloride resin or the like can be used for the adhesive portion 146. The adhesive portion 146 fixes the upper body 28 (joint body 26) and the blade support portion 55 to each other by adhesive. Since the overall thickness (radial length) of the blade support portion 55 and the protrusion 134 is greater 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, which press against each other radially, constitute the vibration reduction portion 147. The vibration reduction portion 147 fixes the upper body 28 and the blade support portion 55 to each other by radial interlocking. The third modified example of the manifold joint 120C includes an adhesive portion 146 and a vibration-reducing portion 147 that fix the upper body 28 and the blade support portion 55 to each other.

[0054] The manifold 120D of the fourth modified example shown in Figure 5 has a shorter circumferential length overall for the blade support portion 55 and the second blade support portion 139 compared to the manifold 120B of the second modified example, and a notch 139a is formed in the second blade support portion 139. The notch 139a penetrates the second wing support portion 139 radially and opens downward. The bottom (upper end) of the notch 139a presses against the longitudinal rib 30B from above, and they are fixed together by interlocking in the vertical direction (axis O1 direction). The bottom of the notch 139a and the longitudinal rib 30B constitute the vibration reduction portion 148. The blade support portion 55 is spaced apart from the vertical rib 30A to the second side D2.

[0055] Furthermore, as shown by the dashed line L1 in Figure 5, the wing support portion 55 may be pressed against the vertical rib 30A from the second side D2 relative to the vertical rib 30A. As shown by the dashed line L2, the second wing support portion 139 may be notched upward from the end of the second side D2 at the bottom of the notch 139a. Even with this configuration, the second wing support portion 139 and the longitudinal rib 30B can constitute a vibration reduction portion.

[0056] (Second Embodiment) Next, a second embodiment of the present invention will be described with reference to Figures 6 and 7. The same reference numerals are used for parts identical to those in the previous embodiment, and their descriptions will be omitted. Only the differences will be described. As shown in Figure 6, the unit body 152 of the blade unit 151 provided in the manifold joint 150 of this embodiment has an upper vertical pipe connection portion 53, a protruding portion 54 (not shown), a blade support portion 55, a swivel blade 56, and two vibration reduction portions 153 and 154. The vibration-reducing sections 153 and 154 are formed in a curved, flat plate shape, and when viewed in the vertical direction, they are formed in an arc shape.

[0057] The vibration-reducing section 153 protrudes from the first side D1 (circumferential direction) end of the blade support section 55 toward the first side D1 (circumferentially, away from the blade support section 55). The vibration-reducing section 154 protrudes from the second side D2 (circumferential direction) end of the blade support section 55 toward the second side D2 (circumferentially, away from the blade support section 55). The vibration-reducing sections 153 and 154 are provided on the blade support section 55. In this embodiment, the circumferential length of the vibration reduction sections 153 and 154 gradually increases as they extend upward. The vibration reduction sections 153 and 154 are connected to the upper vertical pipe connection section 53. The vibration reduction sections 153 and 154 reinforce the blade support section 55.

[0058] As described above, in the manifold joint 150 of this embodiment, the vibration reduction sections 153 and 154 that reinforce the blade support section 55 are provided on the blade support section 55, which is closer to the swivel blade 56 than the vertical pipe connection section in Patent Document 1. Therefore, vibrations of the blade support section 55 that supports the swivel blade 56, which mainly generates noise, can be suppressed more effectively, and noise generated by drainage can be reduced.

[0059] The vibration-reducing section 153 protrudes from the end of the first side D1 of the blade support section 55 and is connected to the upper vertical pipe connection section 53. Therefore, the upper vertical pipe connection section 53 can be attached to the joint body 26 together with the blade support section 55 and the swivel blade 56. Furthermore, the vibration-reducing section 153 can reinforce the blade support section 55 so as not to obstruct the drainage flowing inside the joint body 26. The unit body 152 has two vibration-reducing sections 153 and 154. Therefore, the blade support section 55 can be reinforced more efficiently by the two vibration-reducing sections 153 and 154.

[0060] The unit body 152 does not necessarily have to have a vibration reduction section 153 or a vibration reduction section 154. The vibration reduction section may protrude radially from the blade support section 55.

[0061] The unit body 152A of the vane unit 151A in the manifold joint 150A of the first modified example shown in Figure 7 has a vibration reduction unit 161 instead of a vibration reduction unit 153 in each component of the unit body 152. The vibration-reducing section 161 protrudes from the end of the first side D1 of the blade support section 55 toward the first side D1. When viewed radially opposite the vibration-reducing section 161, the outer edge of the vibration-reducing section 161 is formed in an arc shape.

[0062] The first modified manifold 150A, configured as described above, can suppress the concentration of stress caused by external forces, such as when an external force due to drainage acts on the swivel blade 56, in the vibration reduction section 161 connected to the blade support section 55 and the upper vertical pipe connection section 53, respectively.

[0063] (Third embodiment) Next, a third embodiment of the present invention will be described with reference to Figures 8 to 16. The same reference numerals are used for parts identical to those in the previous embodiments, and their descriptions will be omitted. Only the differences will be described. As shown in Figures 8 to 11, the manifold 165 of this embodiment, in each configuration of the manifold 120B, a second modified example of the first embodiment, includes the unit body 167 of the blade unit 166, the adhesive portion (vibration reduction portion) 81, and the second adhesive portion (second vibration reduction portion) 175, instead of the unit body 52A of the blade unit 51A. The unit body 167 has reinforcing ribs (second reinforcing section, reinforcing section) 168A, 168B in addition to the components of the unit body 52A. The shape of the second reinforcing section is not limited to a rib shape.

[0064] The reinforcing ribs 168A and 168B are provided on the inner circumferential surface of the second wing support portion 139, and protrude radially inward from the second wing support portion 139. The reinforcing ribs 168A and 168B extend along the vertical direction. The reinforcing ribs 168A and 168B are spaced apart from each other in the circumferential direction, and reinforcing rib 168A is positioned on the first side D1 than 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.

[0065] As shown in Figure 11, in this embodiment, the radially inward-facing surface 168aA of the reinforcing rib 168A is inclined so as it extends downward, gradually moving away from the axis O1. The surface 168aA is flat. The reinforcing ribs 168A and 168B are connected to the swivel blade 56 and the second blade support portion 139, respectively. In other words, the upper ends of the reinforcing ribs 168A and 168B are connected to the swivel blade 56.

[0066] At the connection between the protruding portion 54 and the blade support portion 55, the surface 55e facing radially inward and downward is concave toward radially outward and upward. At the connection between the upper vertical pipe connection 53 and the blade support 55, the surface 55f located at the end of the first side D1 and facing downwards from the first side D1 is concave toward upwards from the second side D2. Surfaces 55f and 55e are smoothly connected by a three-dimensional curved surface. At the connection between the upper vertical pipe connection 53 and the blade support 55, the surface 55g located at the end of the second side D2 and facing downwards from the second side D2 is concave toward the direction toward upwards from the first side D1. Surface 55g and surface 55e are smoothly connected by a three-dimensional curved surface.

[0067] As shown in Figure 8, the adhesive portion 81 fixes the joint body 26 and the blade support portion 55 to each other by adhesive. The second adhesive portion 175 fixes the joint body 26 and the second blade support portion 139 to each other by adhesive. Known adhesives for bonding polyvinyl chloride resin, etc., can be used for the adhesive portions 81 and 175. The blade support parts 55, 139 and the joint body 26 may be fixed to each other by at least one of the following: adhesive, fitting, and crimping. The reinforcing rib 168B and the longitudinal rib 30B press against each other in the vertical direction to form the vibration reduction section 169.

[0068] As described above, in the manifold joint 165 of this embodiment, in addition to the blade support portion 55, the second blade support portion 139, which is fixed to the joint body 26 by adhesive, can more securely fix the swivel blade 56, which mainly generates noise, to the joint body 26.

[0069] The unit body 167 has reinforcing ribs 168A and 168B. Therefore, the reinforcing ribs 168A and 168B allow the swivel blade 56 and the second blade support portion 139 to be connected to each other more securely. The reinforcing rib 168A is formed in a plate shape with its thickness direction aligned with the circumferential direction. Therefore, for example, when the volume of the reinforcing rib 168A is kept constant, deformation of the swivel blade 56 in the vertical direction relative to the second blade support portion 139 can be efficiently suppressed.

[0070] The manifold joint 165 may also include the vibration reduction section 124, which fixes the joint body 26 and the blade support section 55 to each other by radial crimping, instead of the adhesive section 81. The manifold joint 165 may also include a second vibration reduction section that fixes the joint body 26 and the second wing support section 139 to each other by radial crimping, instead of the second adhesive section 175. The second vibration reduction section can be any structure that fixes the joint body 26 and the second wing support section 139 to each other by at least one of adhesive, fitting, and crimping. The unit body 167 does not necessarily have to have reinforcing ribs 168A.

[0071] In addition, as shown by line L5 in Figure 10, the length of the swivel blade 56 that protrudes radially inward may be shortened, while the circumferential length of the swivel blade 56 may be lengthened. In this case, it is preferable to increase the circumferential length of the blade support portion 55 to correspond to the swivel blade 56. Furthermore, it is preferable to position the lower end of the vertical rib 30 above the swivel blade 56 so that the swivel blade 56 does not come into contact with the vertical rib 30.

[0072] Furthermore, as shown in Figures 12 and 13, the manifold joint 165A of the first modified example may have a curved surface 55i that is recessed in the direction between the radially outward and downward directions at the connection between the inner circumferential surface of the blade support portion 55 and the upper surface of the swivel blade 56. The manifold joint 165A does not have the second blade support portion 139 and the reinforcing ribs 168A and 168B in each component of the manifold joint 165. As described above, the unit body 167A may have a curved surface 55i instead of reinforcing ribs 168A and 168B to suppress vibrations of the swivel blade 56 and blade support parts 55 and 139.

[0073] As shown in Figures 14 and 15, the second modified example of the manifold joint 165B may have a curved surface 56c that is recessed in the direction between the radially outward and upward directions at the connection between the inner circumferential surface of the second blade support portion 139 and the lower surface of the swivel blade 56. The manifold joint 165B does not have reinforcing ribs 168A and 168B in each component of the manifold joint 165. As described above, the unit body 167B may have a curved surface 56c instead of reinforcing ribs 168A and 168B to suppress vibrations of the swivel blade 56 and blade support parts 55 and 139.

[0074] As shown in the third modified example of the joint 165C in Figure 16, the radially inward-facing surface 168aA of the reinforcing rib 168A may be a curved surface that is concave in the direction between the radially outward and upward directions. Similar to surface 168aA, the surface 168aB of the reinforcing rib 168B that faces radially inward may be a curved surface that is concave in the direction between radially outward and upward.

[0075] Although the first to third embodiments of the present invention have been described in detail above with reference to the drawings, the specific configurations are not limited to these embodiments, and modifications, combinations, deletions, etc., of the configurations are also included without departing from the spirit of the present invention. Furthermore, it goes without saying that each of the configurations shown in each embodiment can be used in appropriate combinations. For example, in the first to third embodiments described above, the joint body 26 does not need to have the locking portion 29, the longitudinal rib 30, and the transverse rib 31.

[0076] The unit body 122 does not necessarily have to have an upper vertical pipe connection portion 53 and a protruding portion 54. Although the joint body 26 is described as being composed of three components: an upper joint body 27, a connecting pipe 37, and a lower joint body, the joint body may be composed of one component, two components, or four or more components.

[0077] For example, the joint may be composed of two members, an upper joint body 27 and a lower joint body 42, without a connecting pipe 37. In this case, the lower end of the upper joint body 27 is provided as a socket or spigot, and the upper end of the lower joint body 42 is provided as a spigot or socket, 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 thermally expandable material such as thermally expandable graphite may be provided at a position below the horizontal pipe connection portion 47 of the upper joint body 27, or on the outer surface of the lower body 43 or connection portion 44 of the lower joint body 42. The width of the joint body 26 of the sheet-like fire-resistant material in the pipe axis direction is 100 mm or more, preferably 140 mm or more, and most preferably 160 mm or more.

[0078] To suppress drainage noise and vibrations of the upper body 28 and the swivel blades 56 that occur when drainage water hits the swivel blades 56 provided on the upper body 28, it is preferable to provide vibration damping material (not shown) on the upper body 28 and the swivel blades 56. Examples of vibration damping materials include rubber such as butyl rubber and elastomers, which may be molded into a sheet so as to be wrapped around the outer surface of the upper body 28, or they may be in the form of a putty. The vibration damping material may be provided on the outer surface of the upper body 28, the lower surface of the swivel blade 56, the adhesive surface 55a on the support side of the blade support part 55, or the inner surface 55b, etc.

[0079] (Fourth Embodiment) (floor structure) As shown in Figures 17 to 19, the floor structure 201 is used, for example, in a multi-story building 400. The floor structure 201 is used, for example, at the points where the horizontal pipes P3 on each floor of the building 400 are connected. The floor structure 201 comprises, for example, a floor slab (floor) S and a manifold joint 210. The piping structure 202 is comprised of a manifold joint 210 and a fire-resistant material 212, which will be described later. The building 400 may also be configured to include the piping structure 202 and a floor slab S.

[0080] (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. In this context, "upper floor F1" refers to a floor (level) of building 400 that is composed of a floor slab S and is located above this floor slab S. "Lower floor F2" refers to a floor of building 400 that is composed of a floor slab S and is located below this floor slab S.

[0081] The floor slab S includes not only general slab floors but also wooden floors. The thickness T of the floor slab S can be arbitrarily selected from, for example, 75 mm, 100 mm, 150 mm, etc., but it is preferable to have a thickness of 150 mm or more. Hereinafter, the thickness T of the floor slab S may be referred to as "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 manifold joint 210 is inserted into the through hole H. The diameter of the through hole H is preferably, for example, 210 mm or more and 300 mm or less.

[0082] In the fourth embodiment, a first vertical pipe (vertical pipe) P1 for the upper floor F1 is provided above a through-hole H formed in the floor slab S, and a second vertical pipe (vertical pipe) P2 for the lower floor F2 is provided below it. A horizontal pipe P3 is also provided along the upper floor F1. A manifold joint 210 inserted into the through-hole H is installed in the floor slab S. A filler material M is filled between the outer surface of the manifold joint 210 and the inner surface of the through-hole H.

[0083] (Manifold joint) The manifold joint 210 is used in the drainage piping 500 (piping structure). The drainage piping 500 is installed in the building 400. Here, for example, the toilet outlets on each floor (neither shown) are located relatively high relative to the surface of the floor slab S. Therefore, the horizontal pipe P3 needs to be positioned relatively high relative to the surface of the floor slab S to align with the toilet outlets. For this purpose, the manifold joint 210 is installed on the floor slab S by a construction method that, while positioned in the through-hole H, raises the horizontal pipe connection part 221 (described later), which connects the horizontal pipe P3, above the floor slab S by a predetermined distance. Hereinafter, this construction method may be referred to as "branch floating construction".

[0084] 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 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 221 may be referred to as the "branch height H1". Also, the lower end 221a of the outer surface of the horizontal pipe connection 221 may be referred to as the "lower outer surface 221a".

[0085] In the fourth embodiment, an example in which the manifold joint 210 is installed on the floor slab S using a branch-floating construction method will be mainly described, but the manifold joint 210 may also be installed on the floor slab S using a normal construction method. In the case of a normal construction method, the manifold joint 210 is installed with the lower outer end 221a of the horizontal pipe connection portion 221 close to the floor slab S. Hereinafter, this construction method may be referred to as "normal construction method". The manifold joint 210 comprises, for example, a joint body 211, a fire-resistant material 212, an upper sound-insulating cover 213, a lower sound-insulating cover (sound-insulating cover, first sound-insulating cover) 214, and fixing tape 215. The fire-resistant material 212 may have a different configuration from that of the manifold joint 210.

[0086] In the fourth embodiment, the manifold joint 210 is described as an example in which the manifold body 211 is equipped with a fire-resistant material 212, an upper sound insulation cover 213, a lower sound insulation cover 214, and fixing tape 215, but it is not limited to this. As another example, the manifold joint 210 may not be equipped with an upper sound insulation cover 213 and a lower sound insulation cover 214. In this case, when the manifold 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 manifold joint 210 (specifically, the vertical pipe connection part 220 described later). In this state, a part of the tapered portion 293 described later is embedded in the filler material M, and the tapered portion 93 is in contact with the filler material M. Furthermore, as will be described later, a fire-resistant pipe 360 ​​may be provided instead of the fire-resistant material 212. The fire-resistant material 212 may have a different configuration from the manifold joint 210.

[0087] (Joint body) The joint body 211 is positioned so that its axis O11 is aligned in the vertical direction. The joint body 211 includes a vertical pipe connection portion 220 that can be connected to a first vertical pipe P1 and a second vertical pipe P2, and a horizontal pipe connection portion 221 that protrudes from the side of the vertical pipe connection portion 220 and can be connected to a horizontal pipe P3. The joint body 211 is a resin joint component. The total length of the joint body 211 is 700 mm. The effective length of the joint body 211 is 625 mm. The length from the lower end of the horizontal pipe connection 221 to the upper end of the joint body 211 is 232 mm. The length from the lower end of the horizontal pipe connection 221 to the projection 222 of the lower connecting pipe 233 (described later) is 378 mm. The length from the projection 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 connection 220 in the joint body 211 is 140 mm. The outer diameter (i.e., maximum outer diameter) of the vertical pipe connection 220 is 180 mm or more and 195 mm or less. The maximum outer diameter of the vertical pipe connection 220 will be explained in detail later. However, various lengths, angles, and other dimensions are not limited to the dimensions exemplified, including the dimensions described later.

[0088] (Vertical pipe connection) The vertical pipe connection section 220 includes an upper connecting pipe 230 that can be connected to the first vertical pipe P1, a vane 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 section 220 is formed in a cylindrical shape with the axis O11 as the center. In the following description, the side of the vertical pipe connection section 220 that aligns with the axis O11 of the vertical pipe connection section 220 that aligns with the upper connecting pipe 230 will be referred to as "upper," and the side that aligns with the lower connecting pipe 233 will be referred to as "lower."

[0089] (Horizontal pipe connection) As shown in Figures 19 and 20, the horizontal pipe connection section 221 is positioned above the floor slab S. The horizontal pipe connection section 221 extends cylindrically outward radially from the peripheral wall of the upper connecting pipe 230 in the vertical pipe connection section 220, perpendicular to the axis O11. The horizontal pipe connection section 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 section 221. The bushing stopper 224 contacts the tip of the horizontal bush 225, which will be described later.

[0090] Three horizontal pipe connection sections 221 are arranged circumferentially around the vertical pipe connection section 220. Two of the three horizontal pipe connection sections 221 are individually positioned to straddle the axis O11 in the radial direction. The remaining horizontal pipe connection section 221 extends in a direction perpendicular to the axis O11, in a direction that forms a 90° angle in plan view with the direction in which each of the aforementioned two horizontal pipe connection sections 221 extends. The horizontal pipe connection portion 221 has an opening 226 that opens into the inner surface of the vertical pipe connection portion 220. In this embodiment, the opening 226 is the opening of the bushing stopper 224 as viewed from the axis O11 inside the upper connecting pipe 230, but is not limited to this. For example, if the bushing stopper 224 is not present in the horizontal pipe connection portion 221, the opening 226 may be an opening formed by the end of the horizontal pipe connection portion 221 that opens into the vertical pipe connection portion 220. The opening 226 is, for example, circular in shape with the axis O12 of the horizontal pipe connection portion 221 as the center.

[0091] The tip of the horizontal pipe connection section 221 that connects the horizontal pipe P3 is provided with a horizontal bush (bushing) 225, a horizontal packing 227, and a horizontal ring 228. The number and direction of extension of the horizontal pipe connection sections 221 are not limited to this configuration and can be changed as desired. For example, there may be no more than two horizontal pipe connection sections 221, there may be only one, or there may be none at all.

[0092] (Upper connecting pipe) Returning from Figure 17 to Figure 19, the upper connecting pipe 230 has an upper connecting section 235 that can be connected to the first vertical pipe P1 and a lower connecting section (lower end) 236 that can be connected to the intermediate pipe 232. The lower connecting section 236 is located in the upper connecting pipe 230 near the lower part of the horizontal pipe connecting section 221. Drainage from the horizontal pipe connecting section 221 joins at the lower connecting section 236. Hereinafter, the lower connecting section 236 may be referred to as the "horizontal pipe confluence section 236". The horizontal pipe confluence section 236 is located in the upper connecting pipe 230 near the lower part of the horizontal pipe connecting section 221 and is a main confluence section into which drainage from the horizontal pipe connecting section 221 joins.

[0093] (Wing unit) As shown in Figures 18 and 20, a blade unit 231 is fitted to the upper end of the upper connecting pipe 230 at the vertical pipe connection section 220. The blade unit 231 has a unit body 240, a sealing member 241, and a retaining member 242.

[0094] As shown in Figures 20 to 22, the unit body 240 includes an upper vertical pipe connection section 245, a blade support section 246, a plurality of reinforcing ribs 247, and a first swivel blade (swivel blade) 248. The upper vertical pipe connection portion 245 is fitted onto the upper end of the upper connecting pipe 230 in 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. By engaging the protrusion 245a with the recess 237 of the upper connecting pipe 230 (see Figure 18), the unit body 240 (specifically the first swivel vane 248) can be positioned circumferentially with respect to the upper connecting pipe 230.

[0095] The blade support section 246 extends downward from a portion of the circumferential direction at the lower end of the upper vertical pipe connection section 245. In other words, the upper vertical pipe connection section 245 is connected to the upper end of the blade support section 246. The blade support portion 246 is formed in a curved, flat plate shape, and when viewed in the vertical direction, it is formed in an arc shape. The blade support portion 246 extends in the vertical direction. That is, the circumferential length of the blade support portion 246 is substantially constant regardless of its position in the vertical direction. Multiple reinforcing ribs 247 are provided on the outer surface 246a of the blade support portion 246 that faces the inner surface of the upper connecting pipe 230.

[0096] Multiple reinforcing ribs 247 extend vertically along the axis O11 from the lower end of the upper vertical pipe connection 245 to the lower end of the blade support 246 on the outer surface 246a of the blade support 246. Multiple reinforcing ribs 247 protrude from the outer surface 246a of the blade support 246 to the inner surface of the upper connecting pipe 230. Multiple reinforcing ribs 247 are in contact with the inner surface of the upper connecting pipe 230. By bringing the multiple reinforcing ribs 247 into contact with the inner surface of the upper connecting pipe 230, the vibrations of the blade support 246 and the first swivel blade 248 can be dampened by the multiple reinforcing ribs 247. Multiple reinforcing ribs 247 constitute a vibration suppression section (vibration reduction section) 249. That is, the vibration suppression section 249 is in contact with the inner surface of the upper connecting pipe 230 and has a vibration suppression function for the blade support 246 and the first swivel blade 248.

[0097] Furthermore, 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.

[0098] As shown in Figures 21 to 24, the lower end portion 246b of the blade support portion 246 extends gradually downward in the circumferential direction toward the first side X1 (the first side in the circumferential direction). The first swivel blade 248 is provided on the inner surface (the surface facing radially inward) of the lower end portion 246b of the blade support portion 246. The upper surface 248a of the first swivel blade 248 protrudes radially inward from the blade support portion 246 with an inclination angle θ11 of 116°. The upper surface 248a of the first swivel blade 248 is inclined with an inclination angle θ12 of 45° so that it gradually moves downward toward the first side X1 in the circumferential direction. The inclination angle θ12 is the angle of inclination from one side portion 246c to the other side portion 246d of the blade support portion 246 with respect to a plane perpendicular to the axis O11.

[0099] The first swirl vane 248 is brought into contact with the drainage in the upper connecting pipe 230 at the vertical pipe connection section 220, making it easier for the drainage to be locally stagnated near the first swirl vane 248. As a result, the effect of improving the drainage capacity in the upper connecting pipe 230 is significantly achieved. The upper vertical pipe connection section 245, the blade support section 246, the multiple reinforcing ribs 247, and the first swivel blade 248 of the unit body 240 are integrally constructed from polyvinyl chloride resin or the like.

[0100] As shown in Figures 20, 25, and 26, the upper connecting pipe 230 has multiple longitudinal ribs (backflow prevention ribs) 252 on its inner surface. Multiple longitudinal ribs 252 are provided on the inner surface of the upper connecting pipe 230, arranged circumferentially on the upper connecting pipe 230. Specifically, the multiple longitudinal ribs 252 are arranged between adjacent horizontal pipe connection sections 221 in the circumferential direction, and between adjacent horizontal pipe connection sections 221 and the blade support section 246 in the circumferential direction. That is, four sets of longitudinal ribs 252 are arranged with spacing in the circumferential direction. The multiple longitudinal ribs 252 are arranged vertically along the axis O11. Of the multiple longitudinal ribs 252, longitudinal rib 252A is located below the first swivel blade 248 (see Figure 18). The height of longitudinal rib 252A is kept low in order to avoid the first swivel blade 248. The vertical rib 252A supports the first swivel vane 248 (see Figure 18) from below. The vertical rib 252 restricts the backflow of wastewater into the horizontal pipe connection section 221.

[0101] The lower ends 252a of the multiple longitudinal ribs 252 are located at the same height in the direction of the axis O11. The lower ends 252a of the multiple longitudinal ribs 252 are located within a first allowable height range, for example, above the lower end 226a of the opening 226 in the horizontal pipe connection 221, and within 25 mm of the lower end 226a of the opening 226. The lower end 226a of the opening 226 is the lowest point of the opening 226 in the direction of the axis O11.

[0102] Here, the horizontal bush 225 has an opening 229. The opening 229 is formed by the end of the horizontal bush 225 that opens into the vertical pipe connection 220. The opening 229 can also be described as the opening of the horizontal bush 225 as viewed from inside the upper connecting pipe 230. The diameter of the opening 229 of the horizontal bush 225 (inner diameter) varies in various ways depending on the diameter of the horizontal pipe P3 (see Figure 17). However, the opening 229 is eccentrically downward with respect to the horizontal pipe connection 221. Here, the axis of the opening 229 is defined as the axis O12 of the horizontal bush 225. In this case, the lower end 252a of the vertical rib 252 may be located in a second allowable height range that is above the lower end 226a of the opening 226 and below the axis O12 of the horizontal bush 225. The lower end 252a of the vertical rib 252 may be located in both the first and second allowable ranges, or in only one of the first and second allowable ranges. Furthermore, for the second permissible range, the lower limit may be the lower end 229a of the opening 229 in the horizontal bush 225, rather than the lower end 226a of the opening 226 in the horizontal pipe connection 221.

[0103] (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 manufactured, for example, by injection molding of a resin composition. A second swirling 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 connection port 261, and a second connection port 262. In the fourth embodiment, the first connection port 261 is a "receiving port 261". The second connection port 262 is a "insertion port 262".

[0104] In the fourth embodiment, the first connection port 261 is described as the "receiving port 261" and the second connection port 262 as the "inserting port 262," but the invention is not limited to this. As other examples, the first connection port 261 may be described as the "inserting port" and the second connection port 262 as the "inserting port." Alternatively, the first connection port 261 may be described as the "receiving port" and the second connection port 262 as the "receiving port." Furthermore, the first connection port 261 may be described as the "inserting port" and the second connection port 262 as the "receiving port."

[0105] The straight pipe section 260 is located between the receiving port 261 and the insertion port 262 in the direction of the axis O11. The receiving port 261 is located coaxially at the upper end of the straight pipe section 260. The receiving port 261 is connected by fitting into the horizontal pipe junction 236 of the upper connecting pipe 230. Therefore, the outer surface of the connection portion between the receiving port 261 and the horizontal pipe junction 236 of the upper connecting pipe 230 is the outer surface of the receiving port 261. A socket 262 is provided coaxially at the lower end of the straight pipe section 260. The inner diameters of the straight pipe section 260 and the socket 262 are preferably larger than the inner diameter of the first vertical pipe P1. The socket 262 is connected by fitting into the receiving opening 291 of the lower connecting pipe 233, which will be described later. Therefore, the outer surface of the connection portion between the socket 262 and the receiving opening 291 of the lower connecting pipe 233 is the outer surface of the receiving opening 291.

[0106] As shown in Figures 27 and 28, the straight pipe section 260 is formed with 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 thickened section 265. The thickened section 265 is integrally molded with the straight pipe section 260. The thickened section 265 is a projection that protrudes radially outward from the side surface of the straight pipe section 260. Hereinafter, the thickened section 265 may be referred to as the "projection 265".

[0107] 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 circumferentially along the side surface of the straight pipe portion 260. The plurality of second ribs 265b are provided at intervals in the direction of 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 circumferentially along the side surface of the straight pipe portion 260 in the direction of the axis O11.

[0108] Multiple first ribs 265a and multiple second ribs 265b are provided across the entire side surface of the straight pipe section 260. Multiple first ribs 265a and multiple second ribs 265b are arranged perpendicular to each other. The outer surfaces of the multiple first ribs 265a and the multiple second ribs 265b are formed flush with each other. The outer surfaces of the multiple first ribs 265a and the multiple second ribs 265b form the "outer surface of the straight pipe section 260". The outer surface of the straight pipe section 260 is the same outer surface as the outer surface of the receiving opening 261 in the intermediate pipe 232 and the outer surface of the receiving opening 291 (described later) in the lower connecting pipe 233.

[0109] In the fourth embodiment, an example is described in which both the multiple first ribs 265a and the multiple second ribs 265b are provided as the protruding portion 265, but the invention is not limited to this. As another example, either the multiple first ribs 265a or the multiple second ribs 265b may be used as the protruding portion 265.

[0110] 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 receiving opening 261. By fitting the first recess 267 into the protrusion 238 (see Figure 19) of the upper connecting pipe 230, the intermediate pipe 232 can be positioned circumferentially relative to the upper connecting pipe 230. The second recess 268 is formed in the lowest of the multiple first ribs 265a. By fitting the second recess 268 into the protrusion 295 (see Figure 31) of the lower connecting pipe 233, the lower connecting pipe 233 can be positioned circumferentially relative to the intermediate pipe 232. Here, as shown in Figure 18, the first swivel blade 248 is positioned circumferentially with respect to the upper connecting pipe 230. Therefore, by positioning the intermediate pipe 232 circumferentially with respect to the upper connecting pipe 230, and positioning the lower connecting pipe 233 circumferentially with respect to the intermediate pipe 232, the third swivel blade 300 (described later) of the lower connecting pipe 233 can be positioned circumferentially with respect to the first swivel blade 248.

[0111] (Modified Intermediate Tube 1) As shown in Figure 29, the intermediate pipe 232 in the fourth embodiment may be replaced with an intermediate pipe 272. The intermediate pipe 272 is a replacement of the straight pipe section 260 in the fourth embodiment with a straight pipe section 273. The straight pipe section 273 is formed with a circular cross-section. The straight pipe section 273 has a thickened section 274 with a constant wall thickness around its entire circumference. The outer surface of the entire circumference of the straight pipe section 273 is the same as the outer surface of the receiving opening 261 in the intermediate pipe 272 and the outer surface of the receiving opening 291 (described later) in the lower connecting pipe 233.

[0112] (Modified intermediate tube, part 2) As shown in Figure 30, the intermediate pipe 272 in Modification 1 may be replaced with the intermediate pipe 282. The intermediate pipe 282 is obtained by replacing the straight pipe section 273 in Modification 1 with the straight pipe section 283, and replacing the spigot 262 in Modification 1 with the spigot 285. The outer surface of the entire circumference of the straight pipe section 283 is the same as the outer surface of the spigot 261 and the spigot 285 in the intermediate pipe 282. Furthermore, the straight pipe section 283 has a plurality of grooves 286 on its inner surface. The plurality of grooves 286 are spaced apart in the circumferential direction. The plurality of grooves 286 are recessed radially outward from the inner surface of the straight pipe section 283 and extend in the direction of the axis O11. Therefore, the wall thickness of the straight pipe section 283 can be reduced at intervals in the circumferential direction.

[0113] Here, on the inner surface of the straight pipe section 283, ribs 287 are formed between a plurality of grooves 286 in the circumferential direction. The plurality of ribs 287 protrude radially inward and extend in the direction of the axis O11. Therefore, the upper ends of the plurality of ribs 287 abut against the horizontal pipe junction 236 (see Figure 18) of the upper connecting pipe 230 when the receiving end 261 of the intermediate pipe 282 is fitted into the horizontal pipe junction 236, and act as stoppers. Also, the lower ends of the plurality of ribs 287 abut against the spigot (not shown) of the lower connecting pipe 233 when the receiving end 285 of the intermediate pipe 282 is fitted into the spigot (not shown) of the lower connecting pipe 233, and act as stoppers.

[0114] (Lower connecting pipe) As shown in Figures 17 to 19 and 31, the lower connecting pipe 233 consists of a pipe body that is narrower in diameter at the bottom than at the top. The lower connecting pipe 233 is located below the intermediate pipe 232. The lower connecting pipe 233 has a receiving opening (upper end) 291 located at its upper end and connected to the inlet 262 of the intermediate pipe 232, a connecting pipe section 292 provided at the lower end of the receiving opening 291, a tapered section 293 that narrows downwards provided at the lower end of the connecting pipe section 292, and a lower pipe section 294 provided at the lower end of the tapered section 293 to which the second vertical pipe P2 is connected. The lower connecting pipe 233 is integrally formed, for example, by injection molding of a synthetic resin material.

[0115] 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 between 110 mm and 120 mm. The tapered section 293 is inclined to decrease in diameter 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 thicker than the normal slab thickness, at least 150 mm. For example, when the manifold joint 210 is installed on the floor slab S using a branch-floating construction method, 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.

[0116] 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 section 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 connection section 220. The maximum outer diameter of the vertical pipe connection section 220 is between 180 mm and 195 mm.

[0117] Since the outer diameter of the connecting pipe section 292 is smaller than the outer diameter of the receiving opening 291, a circumferential step is formed at the boundary between the receiving opening 291 and the connecting pipe section 292. On the side surface of the connecting pipe section 292, a projection 298 is provided, which has a plurality of first ribs 296 and second ribs 297, similar to the projection 265 in the intermediate pipe 232. The projection 298 is formed in a predetermined shape, for example, as will be described later. The outer surfaces of the first rib 296 and the second rib 297 form the outer surface of the connecting pipe section 292. Therefore, the outer surface of the connecting pipe section 292 is formed on the same outer surface as the outer surface of the receiving opening 291, the outer surface of the straight pipe section 260 in the intermediate pipe 232, and the outer surface of the receiving opening 261 in the intermediate pipe 232.

[0118] The second rib 297 is formed in an annular shape by extending in the circumferential direction. The second rib 297 is separated downward from the receiving opening 291. Here, we define the radially outward-facing surface (outward-facing surface) 297a of the second rib 297. Each first rib 296 extends in the direction of the axis O11. Multiple first ribs 296 are spaced apart in the circumferential direction.

[0119] The multiple first ribs 296 and second ribs 297 of the protruding portion 298 may have a different configuration from the joint body 211. In this case, the manifold joint 210 has the joint body 211 and the protruding portion 298. The joint body 211 is formed in a cylindrical shape. The projection 298 is provided on the outer circumferential surface of the lower part of the joint body 211. The lower part of the joint body 211, as used here, means, for example, below the vertical center of the joint body 211. Multiple first ribs 296 and second ribs 297 project radially outward from the outer circumferential surface of the joint body 211.

[0120] 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 swivel vane 300 is provided on the inner surface of the intermediate portion in the vertical direction of the tapered portion 293. The third swivel vane 300 gradually extends toward the first side X1 in the circumferential direction as it goes from top to bottom. More specifically, the surface 300a of the third swivel vane 300 facing the first side X1 gradually extends toward the first side X1 as it goes from top to bottom. The surface 300b of the third swivel vane 300 facing the second side X2 in the circumferential direction gradually extends toward the first side X1 as it goes from top to bottom.

[0121] As shown in Figures 32 to 34, the third swivel blade 300 is inclined downward from its upper end 300c to its lower end 300d with an inclination angle θ14 of 68°. 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 total length of the third swivel blade 300 is 150 mm. The total length is the length from the upper end 300c to the lower end 300d. Furthermore, the third swivel blade 300 protrudes, for example, from the outside to the inside of the tapered portion 293, with an inclination angle θ15 of 30° with respect to the radial direction. The width (circumferential size) of the third swivel blade 300 is 36 mm. The width of the third swivel blade 300 is the width from the inner edge 300e to the outer edge 300f of the third swivel blade 300 when viewed radially from the axis O11. The third swivel vane 300 alters the flow of drainage through the lower connecting pipe 233, causing it to swirl.

[0122] The outer diameter of the lower pipe section 294 is smaller than the outer diameter of the receiving opening 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 section 294, thereby connecting the second vertical pipe P2 to the lower connecting pipe 233. In the fourth embodiment, an example is described in which the lower pipe section 294 is a spline for the second vertical pipe P2, but the lower pipe section 294 may also be a receiving opening for the second vertical pipe P2.

[0123] (Fireproof material) As shown in Figures 17 to 19, the fire-resistant material 212 is provided on the outer surface of the vertical pipe connection 220. The fire-resistant material 212 is covered by the lower sound insulation cover 214, which will be described later. That is, the fire-resistant material 212 is provided between the vertical pipe connection 220 and the lower sound insulation cover 214. The fire-resistant material 212 is provided, for example, in the direction of the axis O11, at a position that avoids the first swivel vane 248, the multiple vertical ribs 252, and the third swivel vane 300.

[0124] The height H2 of the fire-resistant material 212 is preferably more than 150 mm and 300 mm or less in the direction of the axis O11. In the fourth embodiment, as an example, the height H2 of the fire-resistant material 212 is 210 mm and the thickness of the fire-resistant material 212 is 2 mm. The height H2 of the fire-resistant material 212 is preferably higher than the height of the intermediate pipe 232. For example, when the manifold joint 210 is installed on the floor slab S using a branch-floating construction method, it is preferable that at least the lower half of the fire-resistant material 212 is positioned in the through-hole H of the floor slab S.

[0125] Examples of the fire-resistant material 212 include a fire-resistant sheet 310 made of resin containing thermally expandable graphite. The fire-resistant sheet 310 has thermal expandability, which allows it to expand upon heating to form a fire-resistant insulation layer. 50 kW / m 2 There are no particular limitations as long as the volume expansion rate after heating for 30 minutes under the specified heating conditions is 3 to 100 times, but it is preferable that it consists of a resin binder and an inorganic filler. Specifically, the fire-resistant sheet 310 is formed from, for example, Fiblock (registered trademark), a commercially available product manufactured by Sekisui Chemical Co., Ltd.

[0126] The fire-resistant sheet 310 is placed, for example, on the outer surface of the receiving opening 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 receiving opening 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 fire-resistant sheet 310 to the receiving opening 261 of the intermediate pipe 232, the straight pipe section 260 of the intermediate pipe 232, the receiving opening 291 of the lower connecting pipe 233, and the connecting pipe section 292 of the lower connecting pipe 233, the height H2 of the fire-resistant material 212 can be set to 210 mm. Preferably, the upper end 212a of the fire-resistant material 212 is located 15 mm below the lower end of the outer surface of the horizontal pipe connection section 221. Furthermore, the thermal expansion coefficient of the fire-resistant material 212 is preferably 1.3 times or more and 100 times or less.

[0127] As shown in Figure 51, the fire-resistant material 212 covers at least a portion of the outer circumferential surface of the joint body 211 and at least a portion of the surface 297a of the protruding portion 298. The lower end of the fire-resistant material 212 is positioned on the surface 297a of the protruding portion 298. That is, the lower end of the fire-resistant material 212 is in contact with the surface 297a of the protruding portion 298. Preferably, at least a portion of the fire-resistant material 212 is placed in the through-hole H of the floor slab S.

[0128] In the manifold joint 210 configured as described above, for example, a fire-resistant material 212 is placed on the outer circumferential surface of the joint body 211, and the lower end of the fire-resistant material 212 is placed on the surface 297a of the protruding portion 298. Then, for example, the upper end of the fire-resistant material 212 and the joint body 211 are fixed together with a fixing member such as tape, and the lower end of the fire-resistant material 212 and the protruding portion 298 are fixed together with a fixing member. As a result, the entire vertical portion of the fire-resistant material 212 can be fixed to the manifold joint 210 while being stretched in the vertical direction. Therefore, when the fire-resistant material 212 is placed on the manifold joint 210, the formation of wrinkles can be suppressed.

[0129] Furthermore, in the piping structure 202 of this embodiment, a part of the joint body 211 is placed in the through hole H of the floor slab S, and the fire-resistant material 212 can cover at least a part of the outer circumferential surface of the joint body 211 and at least a part of the surface 297a of the protruding portion 298. In this case, since the lower end of the fire-resistant material 212 is placed on the surface 297a of the protruding portion 298, for example, the protruding portion 298 and the lower end of the fire-resistant material 212 can be fixed together with a fixing member such as tape. Furthermore, in the building 400 of this embodiment, the building can be constructed with a manifold joint 210 and a piping structure 202 that suppress the formation of wrinkles when the fire-resistant material 212 is placed.

[0130] Here, we will describe some examples of dimensions for the first rib 296 and the second rib 297, but these dimensions are not limited to these. For example, the thickness (vertical length) of the second rib 297 is preferably between 3 mm and 15 mm. If the thickness of the second rib 297 is less than 3 mm, it is difficult to attach (fix) the fire-resistant material 212 to the second rib 297. If the thickness of the second rib 297 exceeds 15 mm, it is difficult to mold the second rib 297 by injection molding. The thickness (circumferential length) of the first rib 296 is preferably between 3 mm and 15 mm. If the thickness of the first rib 296 is less than 3 mm, it is difficult to attach (fix) the fire-resistant material 212 to the first rib 296. If the thickness of the first rib 296 exceeds 15 mm, it is difficult to mold the first rib 296 by injection molding.

[0131] If the vertical length from the upper end of the lower connecting pipe 233 (the fitting portion between the lower connecting pipe 233 and the intermediate pipe 232) to the second rib 297 is 5 mm or more, it is preferable that the protruding portion 298 has multiple first ribs 296 and multiple second ribs 297. In this case, the number of first ribs 296 and the number of second ribs 297 that the protruding portion 298 has are not limited.

[0132] Here, the reason 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 be 1.3 times or more and 100 times or less will be explained based on Figures 35 to 40. Figures 35 to 40 show examples of installing the manifold joint 210 on the floor slab S using branch floating construction and normal construction methods, when the slab thickness T of the floor slab S is 150 mm, 100 mm, and 75 mm.

[0133] First, we will explain the case where the slab thickness T of the floor slab S is 150 mm, based on Figures 35 and 36. As shown in Figure 35, the manifold joint 210 is installed at a height H1 below the branch by a branch-floating construction method on a 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, it is possible to embed 85 mm of the fire-resistant material 212 into the through-hole H.

[0134] 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. In addition, the inclination angle θ3 of the tapered portion 293 is set to 80° or more and 85° or less. Therefore, the tapered portion 293 can suppress the shedding of residue of the fire-resistant material 212 generated by flames in the floor below F2 of the floor slab S. The suppression of residue shedding will be explained in detail later.

[0135] Alternatively, as shown in Figure 36, the manifold joint 210 may be installed in a floor slab S with a slab thickness T of 150 mm using normal construction methods. In this case, by setting the height H2 of the fire-resistant material 212 to 210 mm, 135 mm of the fire-resistant material 212 can be embedded in the through-hole H. Therefore, a large area of ​​embedding for the fire-resistant material 212 can be secured. As a result, if a flame occurs in the floor below F2 of the floor slab S, the fire-resistant material 212 will expand due to heat, thereby properly sealing the through-hole H.

[0136] 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, fire resistance can be ensured by the fire-resistant material 212 in the event of a fire occurring F2 below the floor slab S.

[0137] Next, we will explain the case where the slab thickness T of the floor slab S is 100 mm, based on Figures 37 and 38. As shown in Figure 37, the manifold joint 210 may be installed at a height H1 below the branch by floating construction on a floor slab S with a slab thickness T of 100 mm. By setting the height H2 of the fire-resistant material 212 to 210 mm, an 85 mm portion 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 properly close the through-hole H.

[0138] Alternatively, as shown in Figure 38, the manifold joint 210 may be installed in a floor slab S with a slab thickness T of 100 mm using normal construction methods. By setting the height H2 of the fire-resistant material 212 to 210 mm, 85 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 be between 1.3 and 100 times, the thermal expansion of the fire-resistant material 212 can properly seal the through-hole H.

[0139] Next, we will explain the case where the slab thickness T of the floor slab S is 75 mm, based on Figures 39 and 40. As shown in Figure 39, the jointed connector 210 may be installed at a height H1 below the branch by floating construction on a floor slab S with a slab thickness T of 75 mm. By setting the height H2 of the fire-resistant material 212 to 210 mm, a 75 mm portion 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 between 1.3 and 100 times, the thermal expansion of the fire-resistant material 212 can properly seal the through-hole H.

[0140] Alternatively, as shown in Figure 40, the manifold joint 210 may be installed in a floor slab S with a slab thickness T of 75 mm using normal construction methods. By setting the height H2 of the fire-resistant material 12 to 210 mm, 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 properly seal the through-hole H.

[0141] As shown in Figures 38 and 40, when the slab thickness T is 75 mm and 100 mm, it is preferable to set the height H2 of the fire-resistant material 212 to 210 mm and the thermal expansion coefficient of the fire-resistant material 212 to be between 1.3 and 100 times. Therefore, if a flame occurs in the floor below F2 of the floor slab S, fire resistance can be ensured by the fire-resistant material 212. By 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 be between 1.3 and 100 times, it is also possible to keep the thickness of the floor slab S to less than 100 mm.

[0142] In the fourth embodiment, an example is 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 the embodiment is not limited to this. As another example, the fire-resistant material 212 may be covered in the joint body 211 from the upper connecting pipe 230 to the intermediate pipe 232. Alternatively, the fire-resistant material 212 may be covered in the joint body 11 from the intermediate pipe 232 to the lower connecting pipe 233.

[0143] As shown in Figures 17 and 41, the fire-resistant material 212 may have multiple fire-resistant sheets 312. The width of the fire-resistant sheet 312 is formed to be narrower, for example, than the width from the receiving opening 261 of the intermediate pipe 232 to the connecting pipe section 292 of the lower connecting pipe 233 in the direction of the axis O11. The multiple fire-resistant sheets 312 are arranged wrapped around the outer surfaces of the receiving opening 61 of the intermediate pipe 232, the straight pipe section 260 of the intermediate pipe 232, the receiving opening 291 of the lower connecting pipe 233, and the connecting pipe section 292 of the lower connecting pipe 233 in the circumferential direction. Multiple fire-resistant sheets 312 are arranged so that adjacent fire-resistant sheets 312 overlap or butt together in the direction of the axis O11 of the vertical pipe connection portion 220. Therefore, the fire-resistant material 212 formed by multiple fire-resistant sheets 312 can cover the outer surfaces of the receiving end 261 of the intermediate pipe 232, the straight pipe portion 260 of the intermediate pipe 232, the receiving end 291 of the lower connecting pipe 233, and the connecting pipe portion 292 of the lower connecting pipe 233.

[0144] Here, multiple 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 multiple second ribs 265b extend along the outer surface of the straight pipe section 260 in the direction of the axis O11. The outer surfaces of the multiple second ribs 265b are formed on the same plane as the outer surface of the receiving opening 261 of the intermediate pipe 232 and the outer surface of the receiving opening 91 of the lower connecting pipe 233. Multiple fire-resistant sheets 314 are arranged on the outer surfaces of the multiple second ribs 265b. Therefore, multiple fire-resistant sheets 314 can be appropriately arranged on the outer surface of the intermediate pipe 232 while suppressing the occurrence of wrinkles.

[0145] Next, we will explain the construction method for the joint 210 that installs multiple fire-resistant sheets 312. First, multiple fire-resistant sheets 312 are wrapped around the outer surfaces of the receiving opening 261 of the intermediate pipe 232, the straight section 260 of the intermediate pipe 232, the receiving opening 291 of the lower connecting pipe 233, and the connecting section 292 of the lower connecting pipe 233 in the circumferential direction. At this time, 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 arranged continuously on the outer surfaces of the receiving opening 261 of the intermediate pipe 232, the straight section 260 of the intermediate pipe 232, the receiving opening 291 of the lower connecting pipe 233, and the connecting section 292 of the lower connecting pipe 233. In other words, a fire-resistant material 212 can be formed to cover the outer surfaces of the receiving end 261 of the intermediate pipe 232, the straight pipe section 260 of the intermediate pipe 232, the receiving end 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 manifold joint 210 in which the fire-resistant material 212 is formed by multiple fire-resistant sheets 312.

[0146] Here, multiple fire-resistant sheets 312 may be placed on the intermediate pipe 232 before the construction of connecting the upper connecting pipe 230, intermediate pipe 232, and lower connecting pipe 233 of the vertical pipe connection section 220. Here, the fire-resistant sheets 312 wrapped around the intermediate pipe 232 form a joint (not shown) where both ends are joined. This joint can be used for positioning when assembling the vertical pipe connection section 220. Specifically, for example, the joints at both ends of a single fire-resistant sheet 312 are designated as positioning sections (not shown). Based on these positioning sections, the upper connecting pipe 230 and the lower connecting pipe 233, which are connected to the intermediate pipe 232, are positioned in the circumferential direction. This allows the third swivel vane 300 of the lower connecting pipe 233 to be positioned in the circumferential direction relative to the first swivel vane 248 of the upper connecting pipe 230.

[0147] As described above, a portion of the joint body 211 may be placed in the through-hole H of the floor slab S.

[0148] (Example 1 of fire-resistant material) As shown in Figures 17 and 42, the multiple fire-resistant sheets 310 in the fourth embodiment may be replaced with multiple fire-resistant sheets 314. The length of the fire-resistant sheet 314 is, for example, formed to the length from the receiving opening 261 of the intermediate pipe 232 to the connecting pipe portion 292 of the lower connecting pipe 233. The width of the fire-resistant sheet 314 is, for example, formed to be narrower than the circumference of the receiving opening 61 of the intermediate pipe 232, the straight pipe portion 260 of the intermediate pipe 232, the receiving opening 291 of the lower connecting pipe 233, and the connecting pipe portion 292 of the lower connecting pipe 233. The multiple fire-resistant sheets 314 are arranged along the axis O11 on the outer surfaces of the receiving opening 261 of the intermediate pipe 232, the straight pipe portion 260 of the intermediate pipe 232, the receiving opening 291 of the lower connecting pipe 233, and the connecting pipe portion 292 of the lower connecting pipe 233.

[0149] Multiple fire-resistant sheets 314 are arranged so that adjacent fire-resistant sheets 310 overlap or butt together in the circumferential direction of the vertical pipe connection portion 220. Therefore, the fire-resistant material 212 formed by multiple fire-resistant sheets 314 can cover the outer surfaces of the receiving end 261 of the intermediate pipe 232, the straight pipe portion 260 of the intermediate pipe 232, the receiving end 291 of the lower connecting pipe 233, and the connecting pipe portion 292 of the lower connecting pipe 233.

[0150] Here, multiple first ribs 265a are provided on the outer surface of the straight pipe section 260 of the intermediate pipe 232 at intervals in the direction of the axis O11. The multiple 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 multiple first ribs 265a are formed on the same plane as the outer surface of the receiving opening 261 of the intermediate pipe 232 and the outer surface of the receiving opening 291 of the lower connecting pipe 233. Multiple fire-resistant sheets 314 are arranged on the outer surfaces of the multiple first ribs 265a. Therefore, the multiple fire-resistant sheets 314 can be appropriately arranged on the outer surface of the intermediate pipe 232 while suppressing the occurrence of wrinkles.

[0151] Next, we will explain the method for constructing the joint 210 in which multiple fire-resistant sheets 314 are installed in the modified example 1. First, multiple fire-resistant sheets 314 are arranged along the axis O11 of the vertical pipe connection section 220 on the outer surfaces of the receiving opening 261 of the intermediate pipe 232, the straight pipe section 260 of the intermediate pipe 232, the receiving opening 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 314 are overlapped or butted together in the circumferential direction of the vertical pipe connection section 220. Thus, multiple fire-resistant sheets 314 can be arranged continuously on the outer surfaces of the receiving opening 261 of the intermediate pipe 232, the straight pipe section 260 of the intermediate pipe 232, the receiving opening 291 of the lower connecting pipe 233, and the connecting pipe section 292 of the lower connecting pipe 233. In other words, a fire-resistant material 212 can be formed to cover the outer surfaces of the receiving end 261 of the intermediate pipe 232, the straight pipe section 260 of the intermediate pipe 232, the receiving end 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 manifold joint 210 in which the fire-resistant material 212 is formed using multiple fire-resistant sheets 314.

[0152] Here, multiple fire-resistant sheets 314 may be placed on the intermediate pipe 232 before the construction of connecting the upper connecting pipe 230, intermediate pipe 232, and lower connecting pipe 233 of the vertical pipe connection section 220. Here, when fire-resistant sheets 314 are placed on the intermediate pipe 232, a joint (not shown) is formed by overlapping or butting adjacent fire-resistant sheets 314. At least one of these joints can be used for positioning when assembling the vertical pipe connection section 220. Specifically, for example, at least one of the joints of adjacent fire-resistant sheets is designated as a positioning section (not shown). Based on this positioning section, the upper connecting pipe 230 and the lower connecting pipe 233, which are connected to the intermediate pipe 232, are positioned in the circumferential direction. This allows the third swivel vane 300 of the lower connecting pipe 233 to be positioned in the circumferential direction relative to the first swivel vane 248 of the upper connecting pipe 230.

[0153] (Upper soundproofing cover) As shown in Figures 17 to 19, the upper sound insulation cover 213 is positioned to surround the outer surface of the upper connecting pipe 230 of the joint body 211. Specifically, the upper sound insulation cover 13 has a sound-absorbing sheet 320 that is wrapped around the upper connecting pipe 230 from the radial outside to cover the upper connecting pipe 230, and a sound insulation sheet 321 that covers the sound-absorbing sheet 320. The sound-absorbing sheet 320 and the sound insulation sheet 321 are both flexible.

[0154] The sound-absorbing sheet 320 is formed of a sound-absorbing material such as needle felt. The sound-absorbing sheet 320 has a surface density of, for example, 1.0 kg / m². 2 The thickness is 10 mm. The sound-absorbing sheet 320 has three first fitting openings (not shown) into which the horizontal pipe connection portion 221 is fitted. The first fitting openings, which are not shown, are formed in an elliptical shape in plan view, for example. When the horizontal pipe connection portion 221 is inserted through the first fitting openings, they are widened laterally to take on a circular shape.

[0155] The sound insulation sheet 321 is formed of, for example, an olefin-based sound insulation material. The sound insulation sheet 321 has, for example, a surface density of 3.44 kg / m². 2 The sound insulation sheet 321 has a thickness of 2 mm. The sound insulation sheet 321 has a second fitting opening (not shown) into which the horizontal pipe connection part 21 is fitted. Three of these second fitting openings (not shown) are arranged laterally, spaced apart from each other. The second fitting opening is formed in an elliptical shape when viewed from the front. When the horizontal pipe connection portion 221 is inserted through the second fitting opening, it is widened laterally to take on a circular shape.

[0156] When wrapping the sound insulation sheet 321 around the radially outer side of the sound absorbing sheet 320, the sound insulation sheet 321 is elastically deformed so that the second fitting opening (not shown) expands, and the horizontal pipe connection portion 221 is inserted into the second fitting opening and fitted into place. As a result, due to the elastic restoring force of the sound insulation sheet 321, the inner peripheral edge of the second fitting opening (not shown) is in close contact with the outer surface of the horizontal pipe connection portion 221.

[0157] The lateral ends of the sound insulation sheet 321 are connected to each other on the side surface of the upper connecting pipe 230 where the lateral pipe connection portion 221 does not protrude. The sound absorbing sheet 320 and the sound insulation sheet 321, which are wrapped around the upper connecting pipe 230, are each formed in an annular shape.

[0158] The upper sound insulation cover 213 is provided so as 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 insulation sheet 321. In this state, the lower end 213a of the upper sound insulation cover 213 can be positioned, for example, on the receiving opening 261 of the intermediate pipe 232. Also, the lower end 213a of the upper sound insulation cover 213 can be positioned above (upper floor) the floor slab S when the manifold joint 210 is installed in a branch-floor configuration.

[0159] (Lower soundproofing cover) The lower sound insulation cover 214 is provided below the upper sound insulation cover 213 in the direction of the axis O11. The lower sound insulation cover 214 is provided in the joint body 211 so as to cover the portion 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 insulation cover 214 integrally covers the intermediate pipe 232 and the lower connecting pipe 233. In the fourth embodiment, an example in which the intermediate pipe 232 and the lower connecting pipe 233 are integrally covered by the lower sound insulation cover 214 will be described, but it is not limited to this. As another example, for example, the lower sound insulation cover 214 may be provided integrally below the horizontal pipe connection 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 insulation cover 214 is positioned, for example, at the receiving opening 261 of the intermediate pipe 232. The upper end 214a of the lower sound insulation cover 214 is abutted against, for example, the lower end 13a of the upper sound insulation cover 213.

[0160] The lower sound insulation cover 214 has a two-layer structure, consisting of an inner layer 200a made of sound-absorbing material such as rock wool, and an outer layer 200b made of sound-insulating material such as EPDM (ethylene propylene diene rubber). Specifically, the inner layer 200a is made of fibers such as needle felt. The inner layer 200a has a surface density of, for example, 1.0 kg / m². 2 The outer layer 200b is 5 mm thick. The 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 / m². 2 The thickness is 3 mm. The outer layer 200b is integrally molded, for example, by injection molding.

[0161] In other words, the lower sound insulation cover 214 is formed integrally in a tubular shape without being divided in the direction of the axis O11. The lower sound insulation cover 214 is fitted, for example, to 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 insulation 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 insulation cover 214 has an inclined portion 330 that covers the tapered portion 293 and a straight portion 331 integrally formed at the upper end of the inclined portion 330.

[0162] The inclined portion 330 is inclined along the tapered portion 293 so as to decrease in diameter downwards. Here, 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 material M. The straight section 331 is formed with the same diameter from the upper end of the inclined section 330 to the upper end of the lower sound insulation cover 214. The outer diameter of the straight section 331 is the maximum outer diameter of the lower sound insulation cover 214. The maximum outer diameter of the lower sound insulation cover 214 is the maximum outer diameter of the manifold joint 210. The maximum outer diameter of the manifold joint 210 is between 180 mm and 195 mm. Furthermore, the inner layer 200a may be a two-layer structure consisting of a fire-resistant material such as fiber-reinforced mortar and an outer layer consisting of a sound-insulating sheet.

[0163] The outer layer 200b of the lower sound insulation cover 214 may have irregularities on its outer surface. The reason for having irregularities on the outer surface of the outer layer 200b will be explained in detail later. Furthermore, a fibrous mortar layer (not shown) covering the lower sound insulation cover 214 may be provided on the manifold joint 210. The reason for providing a fibrous mortar layer covering the lower sound insulation cover 214 on the manifold joint 210 will be explained in detail later.

[0164] In the fourth embodiment, an example is described in which an upper sound insulation cover 213 and a lower sound insulation cover 214 are provided, but it is also possible to provide only the lower sound insulation cover 214, only the upper sound insulation cover 213, or neither.

[0165] (Fixing tape) The fixing tape 215 is wrapped around the lower end 213a of the upper sound insulation cover 213 and the upper end 214a of the lower sound insulation cover 214 from the radially outward direction and adhered to their respective outer surfaces. The fixing tape 215 is positioned on the outer surface of the lower end 213a of the upper sound insulation cover 213 and the outer surface of the upper end 214a of the lower sound insulation cover 214. The outer surfaces of the upper sound insulation cover 213 and the lower sound insulation cover 214 are the outermost surfaces of the maximum outer diameter at the horizontal pipe junction 236. In other words, the fixing tape 15 is located on the outermost surface at the horizontal pipe junction 236. The lower end 213a of the upper sound insulation cover 213 and the upper end 214a of the lower sound insulation cover 214 are abutted against the receiving opening 261 of the intermediate pipe 232. Therefore, the lower end 213a of the upper sound insulation cover 213 and the upper end 214a of the lower sound insulation cover 214 are fixed to the outer surface of the receiving opening 261 of the intermediate pipe 232 with fixing tape 215.

[0166] The fixing tape 215 is made of a material such as a butyl rubber sheet with a polyolefin film. The fixing tape 215 can waterproof the area to which it is attached. Furthermore, the upper sound insulation cover 213 and the lower sound insulation cover 214 are fixed with fixing tape 215 so as to cover the vertical pipe connection part 220. As a result, the joint body 211 has excellent sound insulation properties. For example, even if drainage passes through the inside of the joint body 211, the structure makes it difficult for drainage sound to leak to the outside.

[0167] Here, the lower end 213a of the upper sound insulation cover 213 and the upper end 214a of the lower sound insulation cover 214 are fixed to the receiving opening 261 of the intermediate pipe 232 with fixing tape 215. Therefore, the upper end of the fixing tape can be positioned, for example, at the top of the horizontal pipe junction 236. The uppermost point of the horizontal pipe junction 236 is the highest point of the vertical pipe connection 220 below the horizontal pipe connection 221. More specifically, the uppermost point of the horizontal pipe junction 236 is the position in the horizontal pipe junction 236 corresponding to the lower outer surface end 221a of the horizontal pipe connection 221. Therefore, for example, the fixing tape 215 can be placed at a height of 1 / 2 or more of the slab thickness T of the floor slab S. Alternatively, when the manifold joint 210 is installed in a branch-floor configuration, the fixing tape 215 can be placed above the floor slab S (i.e., at a higher position than the floor slab S).

[0168] In the fourth embodiment, an example comprising an upper sound insulation cover 213 and a lower sound insulation cover 214 will be described, but the embodiment is not limited to this. As another example, even when the manifold joint 210 is equipped only with a lower sound insulation cover 214, the fixing tape 215 may also be applied. Specifically, with the fixing tape 215 attached (positioned) to the upper end 214a of the lower sound insulation cover 214, the upper end of the fixing tape 215 is wrapped around the outer surface of the receiving opening 261 in the intermediate pipe 232 from the outside and attached. The upper end 214a of the lower sound insulation cover 214 is fixed to the outer surface of the receiving opening 261 in the intermediate pipe 232 by the fixing tape 215.

[0169] In this case, the fixing tape 215 is positioned on the outer surface of the lower sound insulation cover 214 and the outer surface of the receiving opening 261 in the intermediate pipe 232. The outer surface of the lower sound insulation cover 214 and the outer surface of the receiving opening 261 in the intermediate pipe 232 are the outermost surfaces of the maximum outer diameter in the horizontal pipe junction 236. In this state, the upper end of the fixing tape 215 can be positioned, for example, at the uppermost part of the horizontal pipe junction 236. Alternatively, the upper end of the fixing tape 215 can be positioned, for example, at the outermost surface of the horizontal pipe junction 236. The reason for positioning the upper end of the fixing tape 215 at the top of the horizontal pipe junction 36 will be explained in detail later.

[0170] (Installation of manifold joint) As shown in Figure 17, the manifold joint 210 is installed on the floor slab S by a branch-floating construction method, in which the horizontal pipe connection portion 221 is raised above the surface of the floor slab S by a predetermined distance. The process of installing the manifold joint 210 on the floor slab S by branch-floating construction method will be described below with reference to Figure 17.

[0171] As shown in Figures 17 and 18, fire-resistant material 212 is attached to the vertical pipe connection portion 220 of the joint body 211. Next, the upper sound insulation cover 213 and the lower sound insulation cover 214 are attached to the vertical pipe connection portion 220. The lower end 213a of the attached upper sound insulation cover 213 and the upper end 214a of the lower sound insulation cover 214 are secured with fixing tape 215. The assembly of the manifold joint 210 is completed by attaching the fire-resistant material 212, the upper sound insulation cover 213, the lower sound insulation cover 214, and the fixing tape to the vertical pipe connection portion 220.

[0172] The manifold joint 210 is inserted into the through-hole H of the floor slab S. The manifold joint 210 is installed so that at least the upper half of the straight pipe section 260 of the intermediate pipe 232, the receiving end 291 of the lower connecting pipe 233, the connecting pipe section 292 of the lower connecting pipe 233, and the tapered section 293 of the lower connecting pipe 233 are positioned in the through-hole H of the floor slab S. With the manifold joint 210 positioned in the through-hole H, the upper end of the second vertical pipe P2 of the floor below F2 (for example, commercially available Eslon® fire-resistant VP pipes manufactured by Sekisui Chemical Co., Ltd. can be used) is fitted 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 portion 330 of the lower sound-insulating cover 214 are housed inside the through-hole H.

[0173] Next, the lower end of the first vertical pipe P1 on the upper floor F1 is fitted into the upper vertical pipe connection part 245 and the sealing member 241 of the vane unit 231, thereby connecting the first vertical pipe P1 to the vertical pipe connection part 220. By connecting the upper end of the second vertical pipe P2 to the lower pipe section 294 of the lower connecting pipe 233, and connecting the lower end of the first vertical pipe P1 to the vertical pipe connection section 220, the horizontal pipe connection section 221 is positioned so as to be floating above the floor slab S by a branch height H1. The branch height H1 is preferably 140 mm.

[0174] Next, a filler material 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 joint 210 (specifically, the lower sound insulation cover 214). In this state, the inclined portion 330 of the lower sound insulation cover 214 is embedded in the filler material M. Also, at least the lower half of the fire-resistant material 212 is embedded in the filler material M. Furthermore, at least the upper half of the straight pipe portion 260 of the intermediate pipe 232, the receiving end 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 is embedded in the filler material M. It is preferable to use mortar with excellent residue retention properties as the filler material M.

[0175] With the filler material M filled into the through-hole H, the end of the horizontal pipe P3 is inserted into the horizontal bush 225 of the horizontal pipe connection part 221 to connect the horizontal pipe P3 to the horizontal pipe connection part 221. Therefore, for example, the horizontal pipe P3 can be positioned at a height that corresponds to the outlet of the toilet bowl. This completes the process of installing the manifold joint 210 on the floor slab S by branch-floating construction.

[0176] The effects and advantages of the floor structure 201, the manifold joint 210, and the construction method of the manifold joint 210 according to the fourth embodiment described above will be explained with reference to Figures 17 to 42.

[0177] Specifically, the diameter of the through-hole H in the floor slab S was set to be between 210 mm and 300 mm. Therefore, the diameter of the through-hole H can be matched to the maximum outer diameter of the manifold joint 210 (for example, the lower sound insulation cover 214 or the vertical pipe connection part 220). This makes it easier to install the manifold joint 210 into the floor slab S.

[0178] Furthermore, the inclination angle θ13 of the tapered portion 293 in the vertical pipe connection portion 220 was set to 80° or more and 85° or less. Also, the inclination angle θ16 of the inclined portion 330 in the lower sound insulation cover 214 covering the tapered portion 293 was set to 70° or more and 89° or less. By setting the inclination angle θ16 of the inclined portion 330 to 70° or more and 89° or less, the tapered shape (inclined shape) of the inclined portion 330 is transferred to the filler material M, and the inner surface of the filler material M also becomes tapered (inclined). Therefore, for example, the detachment of residue of the fire-resistant material 212 generated by flames on the floor below F2 can be suppressed by the taper formed on the inner surface of the filler material M. As a result, the residue can be left in the through hole H, and the fire-resistant performance of the manifold joint 210 can be realized.

[0179] Furthermore, the inclination angle θ13 of the tapered portion 293 was set to 80° or more and 85° or less. Therefore, when the lower sound insulation cover 214 is absent, the tapered shape of the tapered portion 293 is transferred to the filler material M, and the inner surface of the filler material M also becomes tapered. For example, the detachment of residue of the fire-resistant material 212 generated by flames on the floor below F2 can be suppressed by the tapered shape of the inner surface of the filler material M. As a result, the residue can be left in the through-hole H, and the fire-resistant performance of the manifold joint 210 can be realized.

[0180] If the inclination angle θ13 of the tapered section 293 is too small, for example, drainage may skip inside the manifold joint 210, reducing drainage performance. Therefore, by setting the inclination angle θ13 of the tapered section 293 to 80° or more, the appropriate inclination angle θ13 of the tapered section 293 is ensured. This allows for proper drainage flow inside the manifold joint 210, ensuring drainage performance.

[0181] Furthermore, the lower sound insulation cover 214 is combined with a two-layer structure consisting of an inner layer 200a and an outer layer 200b. The inner layer 200a is made of fibers with excellent sound absorption properties. The outer layer 200b is made of a resin containing rubber components with excellent sound insulation properties. As a result, the lower sound insulation cover 214 can prevent water noise from leaking to the outside of the manifold joint 210 as the drainage passes through the inside of the manifold joint 210.

[0182] Furthermore, the lower sound insulation cover 214 has a two-layer structure consisting of an inner layer 200a and an outer layer 200b. This prevents the formation of voids between the filler material M and the lower sound insulation cover 214 when the filler material M filled into the through-holes H of the floor slab S shrinks due to drying. The inner layer 200a and the outer layer 200b may contain expanded graphite. This further effectively prevents the formation of voids between the filler material M and the lower sound insulation cover 214.

[0183] Furthermore, irregularities may be formed on the outer surface of the outer layer 200b of the lower sound insulation cover 214. By forming irregularities on the outer surface of the outer layer 200b, the adhesion strength of the filler M to the outer surface of the outer layer 200b can be increased. This makes it possible to suppress the formation of gaps between the filler M and the lower sound insulation cover 214.

[0184] Furthermore, a fibrous mortar layer (not shown) covering the lower sound insulation cover 214 may be provided in the joint 210. By providing the fibrous mortar layer in the lower sound insulation cover 214, the fibrous mortar layer can be placed in the through-hole H. Therefore, the fire resistance can be improved by the fibrous mortar layer. In addition, the adhesion strength of the filler M to the outer surface of the mortar layer can be increased. This makes it possible to suppress the occurrence of voids between the filler M and the mortar layer. In this case, providing a fibrous mortar layer to the joint 210 increases the weight of the joint 210. Therefore, considering the ease of installation of the joint 210, it is preferable to make the thickness of the fibrous mortar layer 10 mm or less. In the fourth embodiment, an example is described in which the entire lower sound insulation cover 14 is covered with a fiber mortar layer, but the fiber mortar layer may also be provided only in the portion of the lower sound insulation cover 214 corresponding to the through hole H.

[0185] Furthermore, the slab thickness T of the floor slab S was 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. In this state, by setting the inclination angle θ13 of the tapered portion 293 to 80° or more and 85° or less, the tapered shape of the tapered portion 293 is transferred to the filler material M, and the inner surface of the filler material M also becomes tapered. Therefore, for example, the shedding of residue of the fire-resistant material 212 generated by the flames F2 on the floor below can be suppressed by the inclination of the inner surface of the filler material M.

[0186] Furthermore, the inclined portion 330 of the lower sound insulation cover 114 that covers the tapered portion 193 can be positioned in the through hole H. In this state, by setting the inclination angle θ16 of the inclined portion 330 to 70° or more and 89° or less, the tapered shape of the inclined portion 330 is transferred to the filler material M, and the inner surface of the filler material M also becomes tapered. Therefore, for example, the shedding of residue of the fire-resistant material 212 generated by flames on the floor below F2 can be suppressed by the inclination of the inner surface of the filler material M.

[0187] Furthermore, the thermal expansion coefficient of the fire-resistant material 212 may be set to 1.3 times or more and 100 times or less. Also, at least the lower half of the fire-resistant material 212 is placed, for example, in the through-hole H in the floor slab S. Therefore, the thermal expansion of the fire-resistant material 212 can suppress the generation of voids in the through-hole H. This allows the through-hole H to be properly sealed with the fire-resistant material 212.

[0188] 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, the thermal expansion of the fire-resistant material can suppress the generation of voids in through-holes H with a slab thickness T of less than 100 mm. As a result, even when the slab thickness T of the floor slab S is kept below 100 mm, the through-holes H can be properly sealed with the fire-resistant material 212.

[0189] Here, for example, by installing the manifold joint 210 using a branch-floating construction method, the horizontal pipe connection 221 is positioned so that it is floating above the floor slab S by a branch-down height H1. In addition, the fire-resistant material 212 has a height H2 of more than 150 mm (for example, 210 mm). Therefore, with the horizontal pipe connection 221 floating above the branch-down height H1, for example, at least the lower half of the fire-resistant material 212 can be positioned in the through-hole H. This allows the fire-resistant material 212 to expand when a fire occurs on the floor below F2 and the area around the floor slab S and the through-hole H is heated by flames and smoke. Consequently, the expanded fire-resistant material 212 can block the through-hole H. As a result, it is possible to prevent flames and smoke from the floor below F2 from spreading to the floor above F1, and the fire-resistant performance of the fire-resistant material 212 can be realized.

[0190] Furthermore, a fire-resistant sheet 310 was used as the fire-resistant material 212. Therefore, for example, the height H2 of the fire-resistant material 212 can be arbitrarily selected. This allows, for example, the height H2 of the fire-resistant material 212 to be appropriately adjusted to the height required at the construction site.

[0191] Furthermore, it is preferable to make the height H2 of the fire-resistant material 212 higher than that of the intermediate pipe 232. By making the height H2 of the fire-resistant material 212 higher than that of the intermediate pipe 232, a larger area of ​​fire-resistant material 212 can be secured in the through-hole H. Therefore, when a fire occurs in the floor below F2 of the floor slab S, the fire-resistant material 212 can expand and properly seal the through-hole H. This prevents flames and smoke from the floor below F2 from spreading to the floor above F1.

[0192] Furthermore, the lower end 213a of the upper sound insulation cover 213 and the upper end 214a of the lower sound insulation cover 214 are fixed to the outer surface of the receiving opening 261 in the intermediate pipe 232 with fixing tape 215, and the fixing tape 215 is positioned on the upper end 214a of the lower sound insulation cover 214. In addition, the upper end of the fixing tape 215 can be positioned at the highest point of the horizontal pipe junction 236. Therefore, for example, the fixing tape 215 can be positioned at a height of 1 / 2 or more of the slab thickness T of the floor slab S. Alternatively, when the manifold joint 210 is installed in a branch-floating manner, the fixing tape 215 can be positioned above the floor slab S (i.e., at a position higher than the floor slab S). This prevents, for example, damage to the fixing tape 215 from flames on the floor below F2 within the floor slab S. Therefore, it is possible to suppress the transmission of smoke from the floor below F2 to the floor above F1, and the fire-resistant performance of the joint 210 can be realized.

[0193] Here, a horizontal pipe connection section 221 is provided on the upper connecting pipe 230 of the vertical pipe connection section 220. The horizontal pipe connection section 221 is positioned above the floor slab S. Therefore, the upper sound insulation cover 213 that covers the upper connecting pipe 230 can be positioned above the floor slab S, for example, when the manifold joint is installed in a floating manner. Thus, the fixing tape 215 can be positioned above the floor slab S. This prevents the fixing tape 215 from being damaged by flames from the floor below F2, for example, from the floor slab S.

[0194] Furthermore, the jointed connector 210 is positioned in the through-hole H of the floor slab S. This allows the fixing tape 215 to be positioned on the upper end 214a of the lower sound insulation cover 214, thereby preventing damage to the fixing tape 215 from, for example, flames from the floor below F2 at the floor slab S.

[0195] Furthermore, the fixing tape 215 was positioned at a height of at least half the slab thickness T of the floor slab S. This prevents the fixing tape 215 from being damaged by, for example, flames from the floor below F2, through the floor slab S.

[0196] Furthermore, the fixing tape 215 was positioned above the upper surface of the floor slab S. This prevents the fixing tape 215 from being damaged by, for example, flames from the floor below (F2) at the floor slab S.

[0197] The lower end 252a of the vertical rib 252 is positioned within a first allowable height range of 25 mm or less from the lower end 226a of the opening 226 in the horizontal pipe connection section 221, which is its lowest point. Therefore, the vertical rib 252 does not obstruct the inflow of drainage from the opening 226 of the horizontal pipe connection section 221 to the vertical pipe connection section 220. This improves the drainage performance from the opening 226 of the horizontal pipe connection section 221 to the vertical pipe connection section 220.

[0198] Here, for example, a first swirling vane 248 is provided on the inner surface of the vertical pipe connection section 220. Therefore, it is conceivable that wastewater bounced off the first swirling vane 248 could jump into the horizontal pipe connection section 221 and cause backflow. To address this, the lower end 252a of the vertical rib 252 is kept within a first allowable range and is not positioned above the first allowable range. This prevents, for example, wastewater bounced off the first swirling vane 248 inside the vertical pipe connection section 220 from jumping into the horizontal pipe connection section 221 through the opening 226 and causing backflow.

[0199] Furthermore, the lower end 252a of the vertical rib 252 may be located within a second allowable height range, which is greater than or equal to the lower end 226a of the opening 226 and less than or equal to the axis O12 of the horizontal bush 225. Generally, the water level of the horizontal pipe P3 inserted into the horizontal bush 225 is less than or equal to the axis O12. Therefore, the vertical rib 252 can be prevented from obstructing the inflow of drainage from the opening 226 of the horizontal pipe connection 221 to the vertical pipe connection 220. This improves the drainage performance from the opening 226 of the horizontal pipe connection 221 to the vertical pipe connection 220. Furthermore, by positioning the lower end 252a of the vertical rib 252 within the second allowable range, it is possible to suppress, for example, the backflow of wastewater that bounces off the first swirling vane 248 inside the vertical pipe connection 220 by entering the horizontal pipe connection 221 through the opening 226.

[0200] Here, when the vertical pipe connection section 220 is injection molded, the first mold is opened upward from the lower ends 252a of the multiple vertical ribs 252, and the second mold is opened downward from the lower ends 252a of the multiple vertical ribs 252. As a result, a first draft angle is formed on the inner surface of the upper connecting pipe 230, extending upward from the lower ends 252a of the multiple vertical ribs 252, and a second draft angle is formed extending downward from the lower ends 252a of the multiple vertical ribs 252. Therefore, the inner diameter of the inner surface of the vertical pipe connection section 220 is minimized at the lower ends 252a of the multiple vertical ribs 252.

[0201] Further, as the refractory material 212, a plurality of refractory sheets 312, 314 were disposed (affixed) 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 connection pipe 233, and the connection pipe portion 292 of the lower connection pipe 233. Thereby, the outer surfaces can be covered with the refractory material 212 formed by the plurality of refractory sheets 312, 314. By configuring the refractory material 12 as the plurality of refractory sheets 312, 314, the width of each of the refractory sheets 312, 314 can be kept narrower than that of a single refractory sheet. This can suppress the occurrence of wrinkles in the refractory material 212 that covers 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 connection pipe 233, and the connection pipe portion 292 of the lower connection pipe 233.

[0202] Here, for example, when the adjacent refractory sheets 312, 314 are arranged with a gap therebetween, a recessed portion recessed radially inward is formed between the adjacent refractory sheets 312, 314. The outer surface of the refractory material 212 is covered with the lower sound insulation cover 214. For this reason, in the recessed portion between the adjacent refractory sheets 312, 314, the lower sound insulation cover 214 may be recessed radially inward, which may reduce the sound insulation performance.

[0203] Accordingly, in the plurality of refractory sheets 312, 314, the adjacent refractory sheets 312, 314 are overlapped or butted against each other. Therefore, the occurrence of irregularities on the outer surface of the refractory material 212 formed by the plurality of refractory sheets 312, 314 can be suppressed. Thereby, the lower sound insulation cover 214 can be prevented from being recessed radially inward, and the sound insulation performance can be ensured.

[0204] Further, the plurality of refractory sheets 312 were arranged in the circumferential direction 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 connection pipe 233, and the connection pipe portion 292 of the lower connection pipe 233. Here, the joint body 211 is rotatable about the axis O11 when arranging the plurality of fire-resistant sheets 312. Thereby, for example, by rotating the joint body 211, the plurality of fire-resistant sheets 312 can be appropriately wound and arranged 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 connection pipe 233, and the connection pipe portion 292 of the lower connection pipe 233.

[0205] Further, like the plurality of fire-resistant sheets 314 in the first modified example, the plurality of 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 portion 260 of the intermediate pipe 232, the socket 291 of the lower connection pipe 233, and the connection pipe portion 292 of the lower connection pipe 233. Thereby, for example, in a state where the joint body 211 is fixed, the plurality of fire-resistant sheets 314 can be appropriately arranged 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 connection pipe 233, and the connection pipe portion 292 of the lower connection pipe 233.

[0206] Further, in the construction method of the manifold joint 210, the 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 portion 260 of the intermediate pipe 232, the socket 291 of the lower connection pipe 233, and the connection pipe portion 292 of the lower connection pipe 233. At this time, adjacent fire-resistant sheets 312, 314 are overlapped or butted against each other. Thereby, the fire-resistant material 212 that covers 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 connection pipe 233, and the connection pipe portion 292 of the lower connection pipe 233 is formed by the plurality of fire-resistant sheets 312, 314.

[0207] By configuring the fire-resistant material 212 from the plurality of fire-resistant sheets 312, 314, the width of the fire-resistant sheet 310 can be reduced compared to the case where the fire-resistant material 212 is a single fire-resistant sheet. Thereby, the occurrence of wrinkles in the fire-resistant material 212 covering 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 connection pipe 233, and the connection pipe portion 292 of the lower connection pipe 233 can be suppressed.

[0208] Furthermore, in the construction method of the manifold joint 210, by wrapping multiple fire-resistant sheets 312 around each other in the circumferential direction, the joints at both ends of one fire-resistant sheet 312 can be used as positioning sections (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 sections. This allows the third swivel vane 300 of the lower connecting pipe 233 to be positioned in the circumferential direction relative to the first swivel vane 248 of the upper connecting pipe 230. Thus, the construction of connecting the upper connecting pipe 230, the intermediate pipe 232, and the lower connecting pipe 233 of the vertical pipe connection section 220 can be facilitated.

[0209] Furthermore, by overlapping or butting multiple fire-resistant sheets 314 in the circumferential direction in Modification 1, at least one of the joints of adjacent fire-resistant sheets 314 can be designated as a positioning section (not shown). Thus, 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 section. This allows the third swivel vane 300 of the lower connecting pipe 233 to be positioned in the circumferential direction relative to the first swivel vane 248 of the upper connecting pipe 230. Consequently, the construction of connecting the upper connecting pipe 230, intermediate pipe 232, and lower connecting pipe 233 of the vertical pipe connection section 220 is made easier.

[0210] Furthermore, thickened sections 265 and 274 were provided in the straight pipe sections 260 and 273 of the intermediate pipes 232 and 272. In addition, the outer surface of the straight pipe sections 260 and 273 was made identical to the outer surface of the receiving opening 261 in the intermediate pipes 232 and 272, the outer surface of the receiving opening 291 in the lower connecting pipe 233, and the outer surface of the connecting pipe section 292 of the lower connecting pipe 233. Thus, the fire-resistant sheets 310, 312, and 314 forming the fire-resistant material 212 can be flatly attached to the outer surface of the intermediate pipes 232 and 272, the outer surface of the receiving opening 291 in the lower connecting pipe 233, and the outer surface of the connecting pipe section 292 of the lower connecting pipe 233 using the thickened sections 265 and 274. This prevents wrinkles from forming on the fire-resistant material 212 that covers the outer surfaces of the intermediate pipes 232 and 272, the outer surface of the receiving opening 291 in the lower connecting pipe 233, and the outer surface of the connecting pipe portion 292 of the lower connecting pipe 233.

[0211] Furthermore, the thickened portion 265 in the intermediate pipe 232 is made into a protruding portion 265 that extends radially outward from the side surface of the straight pipe portion 260. Therefore, the thickened portion in the straight pipe portion 260 can be reduced. This suppresses the occurrence of sink marks and other defects in the straight pipe portion 260 when the intermediate pipe 232 is injection molded, thereby improving the injection moldability of the intermediate pipe 232.

[0212] Furthermore, the protruding portion 265 is provided with at least one of a first rib 265a extending in the circumferential direction and a second rib 265b extending in the axial direction O11. Thus, ribs can be provided over the entire side surface of the straight pipe section 260. This effectively suppresses the occurrence of wrinkles in the fire-resistant material 212 covering the outer surface of the intermediate pipe 232, the outer surface of the receiving opening 291 of the lower connecting pipe 233, and the outer surface of the connecting pipe section 292 of the lower connecting pipe 233.

[0213] Furthermore, as in the intermediate pipe 272 according to Modification 1, the entire circumference of the straight pipe section 273 in the intermediate pipe 272 may be made to a constant thickness by the thickened section 274. Thus, the outer surface of the entire circumference of the straight pipe section 273 can be made to be the same outer surface as the outer surface of the receiving opening 261 in the intermediate pipe 272, the outer surface of the receiving opening 291 in 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 suppress the occurrence of wrinkles in the fire-resistant material 212 that covers the outer surface of the intermediate pipe 272, the outer surface of the receiving opening 291 in the lower connecting pipe 233, and the outer surface of the connecting pipe section 292 of the lower connecting pipe 233.

[0214] Furthermore, as in the intermediate pipe 282 according to Modification 2, grooves 286 are provided on the inner surface of the straight pipe section 283 in the intermediate pipe 282. Therefore, the wall thickness of the straight pipe section 283 can be reduced by spacing it out in the circumferential direction. This suppresses the occurrence of sink marks and other defects in the straight pipe section 283 when the intermediate pipe 282 is injection molded, thereby improving the injection moldability of the intermediate pipe 282.

[0215] Next, the fifth to seventh embodiments will be described with reference to Figures 43 to 49. In the fifth to seventh embodiments, the same or similar components as those in the fourth embodiment's floor structure are denoted by the same reference numerals, and detailed explanations are omitted.

[0216] (Fifth embodiment) As shown in 43, the fifth embodiment replaces the blade unit 231 of the fourth embodiment with a blade unit 350. The blade unit 350 of the fifth embodiment is fitted to the upper end of the upper connecting pipe 230 in the vertical pipe connection section 220, similar to the blade unit 231 of the fourth embodiment. The blade unit 350 has a unit body 351, a sealing member 241, and a retaining member 242. The unit body 351 has an upper vertical pipe connection section 245, a blade support section 352, a first swivel blade 353, and a plurality of reinforcing ribs 354. The blade support section 352, the first swivel blade 353, and the plurality of reinforcing ribs 354 are arranged inside the upper connecting pipe 230 in the vertical pipe connection section 220. The upper vertical pipe connection section 245, the blade support section 352, the first swivel blade 353, and the multiple reinforcing ribs 354 of the unit body 351 are integrally constructed from polyvinyl chloride resin or the like.

[0217] As shown in Figures 43 to 47, the upper vertical pipe connection portion 245 has a protrusion 245a. The protrusion 245a projects radially outward from the outer surface of the upper vertical pipe connection portion 245. By engaging the protrusion 245a with the recess 237 of the upper connecting pipe 230, the unit body 240 (specifically the first swivel vane 248) can be positioned circumferentially with respect to the upper connecting pipe 230. The blade support portion 352 extends downward from a part of the circumferential direction at the lower end of the upper vertical pipe connection portion 245. The blade support portion 352 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 352 extends in the vertical direction. That is, the circumferential length of the blade support portion 352 is substantially constant regardless of its position in the vertical direction.

[0218] The first swivel blade 353 is provided on the inner surface (the surface facing radially inward) of the blade support portion 352. The upper surface 353a of the first swivel blade 353 protrudes radially inward from the blade support portion 352 with an inclination angle θ17 of 90°. The upper surface 353a of the first swivel blade 353 is inclined with an inclination angle θ18 of 55° so that it gradually moves downward toward the first side X1 in the circumferential direction. The inclination angle θ18 is the angle of inclination from one side portion 352a to the other side portion 352b of the blade support portion 352 with respect to a plane perpendicular to the axis O11.

[0219] As shown in Figure 43, the first swirling blade 353 is brought into contact with the drainage in the upper connecting pipe 230 at the vertical pipe connection section 220, making it easier for the drainage to be locally stagnated near the first swirling blade 353. Therefore, the effect of improving the drainage capacity in the upper connecting pipe 230 is significantly achieved.

[0220] As shown in Figures 44 and 45, a plurality of reinforcing ribs 354 are provided on the lower surface 353b of the first swivel blade 353. The plurality of reinforcing ribs 354 extend from the blade support portion 352 to the outer edge 353c of the first swivel blade 353 on the lower surface 353b of the first swivel blade 353. The plurality of reinforcing ribs 354 can dampen vibrations of the blade support portion 352 and the first swivel blade 353. The plurality of reinforcing ribs 354 constitute a vibration suppression portion 356. That is, the vibration suppression portion 356 has a vibration suppression function for the blade support portion 352 and the first swivel blade 353.

[0221] (Sixth Embodiment) As shown in Figure 48, the sixth embodiment incorporates thermally expandable graphite into a portion of the vertical pipe connection 220, thereby configuring a portion of the vertical pipe connection 220 as a fire-resistant pipe 360. Specifically, the sixth embodiment replaces, for example, the fire-resistant material 212 and intermediate pipe 232 of the fourth embodiment with a fire-resistant pipe 360. In the sixth embodiment, an intermediate pipe is used as an example to describe a portion of the vertical pipe connection 220, but the portion of the vertical pipe connection 220 is not limited to an intermediate pipe.

[0222] The fire-resistant pipe 360 also serves as an intermediate pipe connected between the upper connection pipe 230 and the lower connection 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 produced, for example, by injection molding a resin composition. The fire-resistant pipe 360 includes, for example, a straight pipe portion 361, a socket 362, and a spigot 363. The height of the fire-resistant pipe 360 is preferably more than 150 mm and 300 mm or less.

[0223] The fire-resistant pipe 360 contains thermally expandable graphite. Further, the fire-resistant pipe 360 adopts, for example, a single-layer structure made of a resin composition containing 1 to 20 parts by weight of thermally expandable graphite with respect to 100 parts by weight of a polyvinyl chloride-based resin. Alternatively, a three-layer structure composed of a thermally expandable fire-resistant layer made of a resin composition containing 1 to 20 parts by weight of thermally expandable graphite with respect to 100 parts by weight of a polyvinyl chloride-based resin, and coating layers of a polyvinyl chloride-based resin composition not containing thermally expandable graphite that cover the inner and outer surfaces of the thermally expandable fire-resistant layer may be adopted.

[0224] According to the fire-resistant pipe 360 of the sixth embodiment described above, the intermediate pipe constituting a part of the vertical pipe connection portion 220 is used as the fire-resistant pipe 360. That is, the intermediate pipe is also used as the fire-resistant pipe 360. In addition, the height of the fire-resistant pipe 360 is secured to be more than 150 mm. Therefore, in a branch-elevated installation state where the horizontal pipe connection portion 221 is lifted from the floor slab S, a large size of the fire-resistant pipe 360 disposed in the through-hole H can be secured. Thereby, when a fire breaks out on the lower floor F2 of the floor slab S and the periphery of the floor slab S or the through-hole H is heated by flame or smoke, the fire-resistant pipe 360 can be expanded. Therefore, the through-hole H can be closed by the expanded fire-resistant pipe 360. As a result, the flame and smoke on the lower floor F2 can be prevented from spreading to the upper floor F1, and the fire-resistant performance of the fire-resistant pipe 360 can be exhibited.

[0225] Further, by also using the intermediate pipe constituting a part of the vertical pipe connection portion 220 as the fire-resistant pipe 160, it is not necessary to attach a fire-resistant material to the outer surface of the joint body 11. Thereby, the outer diameter of the collective joint 210 can be kept small.

[0226] Furthermore, the intermediate pipe constituting the fire-resistant pipe 360 ​​has the same shape as, for example, the intermediate pipe 232 in the fourth embodiment. Therefore, the fire-resistant pipe 360 ​​is positioned to avoid the first swivel vane 248, the multiple longitudinal ribs 252, and the third swivel vane 300. This prevents the first swivel vane 248, the longitudinal ribs 252, and the third swivel vane 300 from hindering the thermal expansion of the fire-resistant pipe 360.

[0227] (Seventh Embodiment) As shown in Figure 49, the seventh embodiment connects the upper connecting pipe 230 at the vertical pipe connection section 220 by fitting the receiving end 291 of the lower connecting pipe 233 into the lower connecting section (horizontal pipe junction) 236, and provides fire-resistant material 380 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, placed and attached to the outer surface of the connecting pipe section 292 of the lower connecting pipe 233. The height of the fire-resistant material 380 is preferably more than 150 mm.

[0228] In the seventh embodiment, an example is described in which the fire-resistant material 380 is placed on the outer surface of the connecting pipe portion 292 of the lower connecting pipe 233, but the embodiment is not limited to this. As another example, the fire-resistant material 380 may be placed continuously on both the lower connecting portion 236 of the upper connecting pipe 230 and the lower connecting pipe 233.

[0229] It should be noted that the technical scope of the present invention is not limited to the embodiments described above, and various modifications can be made without departing from the spirit of the invention.

[0230] In the above embodiment, an example was described in which the height H2 of the fire-resistant material 212 is greater than 150 mm and less than or equal to 300 mm, but the height H2 of the fire-resistant material 12 is not limited to greater than 150 mm and less than or equal to 300 mm. In the above embodiment, an example was described in which it is preferable to make the height H2 of the fire-resistant material 212 higher than the height of the intermediate pipe 232, but the embodiment is not limited to this. In the above embodiment, an example was described in which the fixing tape 215 is placed at a height of 1 / 2 or more of the slab thickness T of the floor slab S, but the embodiment is not limited to this. In the above embodiment, an example was described in which the fixing tape 215 is placed above the upper surface of the floor slab S, but the embodiment is not limited to this.

[0231] In the above embodiment, an example was described in which the lower ends 252a of the multiple vertical ribs 252 are positioned within a first allowable height range of at least the lower end 226a of the opening 226 in the horizontal pipe connection portion 221, and 25 mm or less from the lower end 226a of the opening 226, but the embodiment is not limited to this. In the above embodiment, an example was described in which the lower end 252a of the vertical rib 252 is positioned within a second allowable height range that is greater than or equal to the lower end 226a of the opening 226 in the horizontal pipe connection portion 221 and less than or equal to the axis O12 of the horizontal bush 225, but the embodiment is not limited to this. In the above embodiment, an example was described in which the lower ends 252a of a plurality of longitudinal ribs 252 are arranged at the same height in the direction of axis O11, but the embodiment is not limited to this.

[0232] In the above embodiment, an example was described in which thickened sections 265 and 274 are provided in the straight pipe sections 260 and 273 of the intermediate pipes 232 and 272, so that the outer surface of the straight pipe sections 260 and 273 is the same as the outer surface of the receiving opening 261 of the intermediate pipe 232 and the receiving opening 291 of the lower connecting pipe 233, but the invention is not limited to this. It is also not necessary to provide thickened sections 265 and 274 in the straight pipe sections 260 and 273 of the intermediate pipes 232 and 272. In the above embodiment, the thickened portion (protruding portion) 265 of the straight pipe portion 260 was described as a first rib 265a extending in the circumferential direction and a second rib 265b extending in the axial direction, but the direction in which the first rib 265a and the second rib 265b extend can be arbitrarily selected.

[0233] Furthermore, it is possible to replace the components in this embodiment with well-known components as appropriate, without departing from the spirit of the present invention.

[0234] (Eighth embodiment) Next, an eighth embodiment of the present invention will be described with reference to Figure 50. The same reference numerals are used for parts identical to those in the previous embodiments, and their descriptions will be omitted. Only the differences will be described. As shown in Figure 50, for example, the drainage piping 500 having the manifold joint 210 of the fourth embodiment is installed in a building 410. The manifold joint 210 is supported by a support bracket 420 below the through-hole H in the floor slab S. In addition to the through-hole H, a second through-hole H10 is formed in the floor slab S.

[0235] A pipe space S15 is formed between two walls S10 and S11 that extend downward from the floor slab S. The manifold joint 210 is located in the pipe space S15. Walls S10 and S11 have through-holes S10a and S11a, respectively. Wall S10 is positioned along the horizontal plane, between through-hole H and the second through-hole H10. For example, walls S10 and S11 are made of concrete.

[0236] The lower end of the first vertical pipe P1 is connected to the vertical pipe connection section 220 of the manifold 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. The first end of the horizontal pipe P3 and the first end of the horizontal pipe P3A are connected to the multiple horizontal pipe connection sections 221 of the manifold 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.

[0237] For example, horizontal pipe P3A has a first pipe P3B and a second pipe P3C. The first end of the first pipe P3B is connected to the horizontal pipe connection portion 221 of the manifold joint 210. The first pipe P3B extends along the horizontal plane. The first pipe P3B passes through the through hole S10a in the wall S10. A filler material M is filled between the outer surface of the first pipe P3B and the opening periphery of the through hole S10a in the wall S10. The 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 the 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 opening periphery of the second through-hole H10 in the floor slab S. The second pipe P3C protrudes upward (towards the upper floor F1) above the floor slab S. A drainage device 425, such as a bathtub, is connected to the second end of the second pipe P3C.

[0238] The upper end of the second vertical pipe P2 is connected to the lower connecting pipe 233 of the manifold joint 210. A filler material M is filled between the outer surface of the second vertical pipe P2 and the walls S10 and S11. These first vertical pipe P1, second vertical pipe P2, horizontal pipe P3, and horizontal pipe P3A can be formed from polyvinyl chloride resin, polyethylene resin, polypropylene resin, or the like.

[0239] As described above, in this embodiment, the first pipe P3B of the horizontal pipe P3 and horizontal pipe P3A is positioned below the floor slab S. The manifold joint provided in the building 410 may be any of the manifold joints from the first to the seventh embodiment. [Explanation of Symbols]

[0240] 202 Piping structure 210 Manifold joint 211 Fitting body 212 Fireproof materials 297a side 298 Protrusion 400 Buildings H through hole O11 axis S floor slab

Claims

1. The joint body is positioned so that its axis is aligned in the vertical direction, A protrusion provided on the outer circumferential surface of the lower part of the joint body, A manifold fitting equipped with the following features.

2. A manifold joint according to claim 1, wherein a part of the joint body is positioned in a through-hole in the floor slab, A fire-resistant material covering at least a portion of the outer circumferential surface of the joint body and at least a portion of the surface of the protruding portion facing radially outward, Equipped with, The lower end of the fire-resistant material is positioned on the surface of the protruding portion, forming a piping structure.

3. The piping structure according to claim 2, The aforementioned floor slab, A building equipped with [a specific feature / amenity].

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