Manifold joint and construction method

Abstract

The present invention provides a joint and construction method that can suppress the occurrence of wrinkles in fire-resistant materials. [Solution] The manifold joint 10 comprises a vertical pipe connection portion 20 and a fire-resistant material 12. The fire-resistant material 12 has a plurality of fire-resistant sheets 112 arranged on the outer surface of the vertical pipe connection portion 20. The plurality of fire-resistant sheets 112 are arranged such that adjacent fire-resistant sheets 112 are overlapped or butted together.

Description

Technical Field

[0001] The present invention relates to a manifold joint and a construction method.

Background Art

[0002] Conventionally, as a manifold joint, for example, one is known in which an upper connection pipe and a lower connection pipe are connected via an intermediate pipe, and a part of the outer surface in the axial direction is covered with a refractory material. By arranging the refractory material in the through-hole of the floor slab, it is possible to develop fire resistance performance at the through-hole by, for example, expanding the refractory material with the heat of a fire (see, for example, Patent Document 1).

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] However, conventional refractory materials cover the outer periphery by winding and sticking a relatively wide refractory sheet. In particular, for example, in the case of branch floating construction, in which the lateral pipe connection portion of the manifold joint is lifted from the floor slab to construct the manifold joint, the width of the refractory sheet becomes large. For this reason, when the refractory sheet is wound around the outer periphery to cover the outer surface with the refractory material, wrinkles are likely to occur on the surface of the refractory material.

[0005] The present invention has been made in view of the aforementioned circumstances, and an object of the present invention is to provide a manifold joint and a construction method capable of suppressing the occurrence of wrinkles in a refractory material.

Means for Solving the Problems

[0006] A manifold joint according to one aspect of the present invention is a manifold joint comprising a vertical pipe connection portion, a horizontal pipe connection portion, and a fire-resistant material, wherein the fire-resistant material has a plurality of fire-resistant sheets arranged on the outer surface of the vertical pipe connection portion, and the plurality of fire-resistant sheets are overlapped or butted together. [Effects of the Invention]

[0007] According to the present invention, it is possible to provide a joint and construction method that can suppress the occurrence of wrinkles in fire-resistant materials. [Brief explanation of the drawing]

[0008] [Figure 1] This is a cross-sectional view of a part of a floor structure equipped with a jointed connector according to the first embodiment of the present invention. [Figure 2] Figure 1 is a cross-sectional view of the floor structure, showing the far side after cutting along the plane of the paper. [Figure 3] This is a cross-sectional view of the floor structure in Figure 1, showing the front side after cutting along the plane of the paper. [Figure 4] Figure 3 is a cross-sectional view of the joint body, broken along the line IV-IV. [Figure 5] This is a front view showing the unit body of the manifold fitting according to the first embodiment. [Figure 6] Figure 5 is a perspective view of the unit body from the rear. [Figure 7] Figure 5 is a perspective view of the unit body, broken along the line VII-VII. [Figure 8] Figure 5 is a perspective view of the unit body cut along line VIII-VIII. [Figure 9] Figure 3 is a cross-sectional view showing the upper connecting pipe and the horizontal pipe connection. [Figure 10] Figure 2 is a cross-sectional view showing the upper connecting pipe and the horizontal pipe connection. [Figure 11] This is a perspective view showing an intermediate pipe according to the first embodiment. [Figure 12] Figure 11 is a perspective view of the intermediate pipe fractured along the line XII-XII. [Figure 13]It is a partially broken perspective view of the intermediate pipe of Modification 1. [Figure 14] It is a partially broken perspective view of the intermediate pipe of Modification 2. [Figure 15] It is a front view showing the lower connection pipe provided in the manifold joint according to the first embodiment. [Figure 16] It is a cross-sectional view of the lower connection pipe of Fig.15 broken along the axis. [Figure 17] It is a bottom view of the lower connection pipe of Fig.15 viewed from the arrow XVII. [Figure 18] It is a side view showing the third swirl vane of Fig.16. [Figure 19] It is a cross-sectional view showing a state where the manifold joint according to the first embodiment is installed on a floor slab with a thickness of 150 mm by branch floating construction. [Figure 20] It is a cross-sectional view showing a state where the manifold joint according to the first embodiment is installed on a floor slab with a thickness of 150 mm by normal construction. [Figure 21] It is a cross-sectional view showing a state where the manifold joint according to the first embodiment is installed on a floor slab with a thickness of 100 mm by branch floating construction. [Figure 22] It is a cross-sectional view showing a state where the manifold joint according to the first embodiment is installed on a floor slab with a thickness of 100 mm by normal construction. [Figure 23] It is a cross-sectional view showing a state where the manifold joint according to the first embodiment is installed on a floor slab with a thickness of 75 mm by branch floating construction. [Figure 24] It is a cross-sectional view showing a state where the manifold joint according to the first embodiment is installed on a floor slab with a thickness of 75 mm by normal construction. [Figure 25] It is a side view in which the manifold joint according to the first embodiment is provided with a fireproof sheet. [Figure 26] It is a side view in which the fireproof sheet of Modification 1 is provided on the manifold joint. [Figure 27] It is a cross-sectional view showing a manifold joint provided with a vane unit according to the second embodiment of the present invention. [Figure 28] It is a cross-sectional view showing the unit main body of Fig.27. [Figure 29] It is a perspective view of the unit main body of Fig.28 viewed from below. [Figure 30] Figure 28 is a side view of the unit body as seen from the side. [Figure 31] Figure 28 is a perspective view of the unit body from above. [Figure 32] This is a cross-sectional view showing a manifold fitting equipped with a fire-resistant pipe according to a third embodiment of the present invention. [Figure 33] This is a cross-sectional view showing a manifold joint according to the fourth 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. [Modes for carrying out the invention]

[0009] Hereinafter, an example of a floor structure according to an embodiment of the present invention will be described with reference to Figures 1 to 33.

[0010] (First Embodiment) (floor structure) As shown in Figures 1 to 3, the floor structure 1 is used, for example, in a multi-story building 200. The floor structure 1 is used, for example, in the parts where the horizontal pipes P3 on each floor of the building 200 are connected. The floor structure 1 comprises, for example, a floor slab (floor) S and a manifold joint 10.

[0011] (Floor slab) The floor slab S is the floor that separates the upper floor F1 above the floor slab S from the lower floor F2 below the floor slab S. 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. The manifold joint 10 is positioned with the through hole H inserted. The diameter of the through hole H is preferably, for example, 210 mm or more and 300 mm or less.

[0012] In the first embodiment, a first 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 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 10 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 10 and the inner surface of the through-hole H.

[0013] (Manifold joint) The manifold joint 10 is used in the drainage piping 300 (piping structure). The drainage piping 300 is installed in the building 200. 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 10 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 21 (described later) that 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".

[0014] In this state, the height H1 from the surface of the floor slab S to the lower end 21a of the outer surface of the horizontal pipe connection 21, which will be described later, is preferably 140 mm. Hereinafter, the height H1 from the floor slab S to the lower end 21a of the outer surface of the horizontal pipe connection 21 may be referred to as the "branch height H1". Also, the lower end 21a of the outer surface of the horizontal pipe connection 21 may be referred to as the "lower outer surface 21a".

[0015] In the first embodiment, an example in which the manifold joint 10 is installed on the floor slab S using a branch-floating construction method will be mainly described, but the manifold joint 10 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 10 is installed with the lower outer end 21a of the horizontal pipe connection portion 21 close to the floor slab S. Hereinafter, this construction method may be referred to as "normal construction method". The manifold joint 10 comprises, for example, a joint body 11, a fire-resistant material 12, an upper sound insulation cover 13, a lower sound insulation cover (sound insulation cover, first sound insulation cover) 14, and fixing tape 15.

[0016] In the first embodiment, the manifold joint 10 is described as a joint body 11 equipped with a fire-resistant material 12, an upper sound-insulating cover 13, a lower sound-insulating cover 14, and fixing tape 15, but it is not limited to this. As another example, the manifold joint 10 may not be equipped with an upper sound-insulating cover 13 and a lower sound-insulating cover 14. In this case, when the manifold joint 10 is housed in a 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 10 (specifically, the vertical pipe connection part 20 described later). In this state, a part of the tapered portion 93 described later is embedded in the filler material M, and the tapered portion 93 is in contact with the filler material M. Also, as described later, a fire-resistant pipe 160 may be provided instead of the fire-resistant material 12.

[0017] (Joint body) The joint body 11 includes a vertical pipe connection portion 20 that can be connected to a first vertical pipe P1 and a second vertical pipe P2, and a horizontal pipe connection portion 21 that protrudes from the side of the vertical pipe connection portion 20 and can be connected to a horizontal pipe P3. The joint body 11 is a resin joint component. The total length of the joint body 11 is 700 mm. The effective length of the joint body 11 is 625 mm. The length from the lower end of the horizontal pipe connection 21 to the upper end of the joint body 11 is 232 mm. The length from the lower end of the horizontal pipe connection 21 to the projection 22 of the lower connecting pipe 33 (described later) is 378 mm. The length from the projection 22 of the lower connecting pipe 33 to the lower end of the lower connecting pipe 33 is 90 mm. The inner diameter of the vertical pipe connection 20 in the joint body 11 is 140 mm. The outer diameter (i.e., maximum outer diameter) of the vertical pipe connection 20 is 180 mm or more and 195 mm or less. The maximum outer diameter of the vertical pipe connection 20 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.

[0018] (Vertical pipe connecting pipe) The vertical pipe connection section 20 includes an upper connecting pipe 30 that can be connected to the first vertical pipe P1, a vane unit 31 connected to the upper connecting pipe 30, an intermediate pipe 32 connected to the upper connecting pipe 30, and a lower connecting pipe 33 connected to the intermediate pipe 32 and connectable to the second vertical pipe P2. The vertical pipe connection section 20 is formed in a cylindrical shape with axis O1 as the center. In the following description, the side of the vertical pipe connection section 20 that aligns with axis O1 with the upper connecting pipe 30 will be referred to as "upper," and the side that aligns with the lower connecting pipe 33 will be referred to as "lower."

[0019] (Horizontal pipe connecting pipe) As shown in Figures 3 and 4, the horizontal pipe connection section 21 is positioned above the floor slab S. The horizontal pipe connection section 21 extends cylindrically outward radially from the peripheral wall of the upper connecting pipe 30 in the vertical pipe connection section 20, perpendicular to the axis O1. The horizontal pipe connection section 21 has a bushing stopper 24. The bushing stopper 24 is provided in an annular shape on the inner surface of the horizontal pipe connection section 21. The bushing stopper 24 contacts the tip of the horizontal bush 25, which will be described later.

[0020] Three horizontal pipe connection sections 21 are arranged circumferentially around the vertical pipe connection section 20. Two of the three horizontal pipe connection sections 21 are individually positioned radially on either side of the axis O1. The remaining horizontal pipe connection section 21 extends radially perpendicular to the axis O1, 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 21 extends. The horizontal pipe connection section 21 has an opening 26 that opens into the inner surface of the vertical pipe connection section 20. In this embodiment, the opening 26 is the opening of the bushing stopper 24 as seen from the axis O1 inside the upper connecting pipe 30, but is not limited to this. For example, if there is no bushing stopper 24 in the horizontal pipe connection section 21, the opening 26 may be an opening formed by the end of the horizontal pipe connection section 21 that opens into the vertical pipe connection section 20. The opening 26 is, for example, circular in shape with the axis O2 of the horizontal pipe connection section 21 as the center.

[0021] The tip of the horizontal pipe connection section 21 that connects the horizontal pipe P3 is provided with a horizontal bush (bushing) 25, a horizontal packing 27, and a horizontal ring 28. The number and direction of extension of the horizontal pipe connection sections 21 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 21, there may be only one, or there may be no horizontal pipe connection sections at all.

[0022] (Upper connecting pipe) Returning from Figure 1 to Figure 3, the upper connecting pipe 30 has an upper connecting section 35 that can be connected to the first vertical pipe P1 and a lower connecting section (lower end) 36 that can be connected to the intermediate pipe 32. The lower connecting section 36 is located in the upper connecting pipe 30 near the lower side of the horizontal pipe connecting section 21. Drainage from the horizontal pipe connecting section 21 joins at the lower connecting section 36. Hereinafter, the lower connecting section 36 may be referred to as the "horizontal pipe confluence section 36". The horizontal pipe confluence section 36 is located in the upper connecting pipe 30 near the lower side of the horizontal pipe connecting section 21 and is a main confluence section into which drainage from the horizontal pipe connecting section 21 joins.

[0023] (Wing unit) As shown in Figures 2 and 4, a blade unit 31 is fitted to the upper end of the upper connecting pipe 30 in the vertical pipe connection section 20. The blade unit 31 has a unit body 40, a sealing member 41, and a retaining member 42.

[0024] As shown in Figures 4 to 6, the unit body 40 includes an upper vertical pipe connection section 45, a blade support section 46, a plurality of reinforcing ribs 47, and a first swivel blade 48. The upper vertical pipe connection portion 45 is fitted onto the upper end of the upper connecting pipe 30 in the vertical pipe connection portion 20 (see Figure 2). The upper vertical pipe connection portion 45 has a protrusion 45a. The protrusion 45a protrudes radially outward from the outer surface of the upper vertical pipe connection portion 45. By engaging the protrusion 45a with the recess 37 of the upper connecting pipe 30 (see Figure 2), the unit body 40 (specifically the first swivel vane 48) can be positioned circumferentially with respect to the upper connecting pipe 30. The blade support section 46 extends downward from a part of the circumferential direction at the lower end of the upper vertical pipe connection section 45. In other words, the upper vertical pipe connection section 45 is connected to the upper end of the blade support section 46. The blade support portion 46 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 46 extends in the vertical direction. That is, the circumferential length of the blade support portion 46 is substantially constant regardless of its position in the vertical direction. Multiple reinforcing ribs 47 are provided on the outer surface 46a of the blade support portion 46 that faces the inner surface of the upper connecting pipe 30.

[0025] Multiple reinforcing ribs 47 extend vertically along the axis O1 from the lower end of the upper vertical pipe connection 45 to the lower end of the blade support 46 on the outer surface 46a of the blade support 46. Multiple reinforcing ribs 47 protrude from the outer surface 46a of the blade support 46 to the inner surface of the upper connecting pipe 30. Multiple reinforcing ribs 47 are in contact with the inner surface of the upper connecting pipe 30. By bringing the multiple reinforcing ribs 47 into contact with the inner surface of the upper connecting pipe 30, vibrations of the blade support 46 and the first swivel blade 48 can be dampened by the multiple reinforcing ribs 47. Multiple reinforcing ribs 47 constitute a vibration suppression section 49. That is, the vibration suppression section 49 is in contact with the inner surface of the upper connecting pipe 30 and has a vibration suppression function for the blade support 46 and the first swivel blade 48.

[0026] Furthermore, the multiple reinforcing ribs 47 are arranged at intervals in the circumferential direction of the upper connecting pipe 30. A space 50 partitioned by the multiple reinforcing ribs 47 is formed between the outer surface 46a of the blade support portion 46 and the inner surface of the upper connecting pipe 30. In other words, the space 50 is formed by being surrounded by the upper connecting pipe 30, the blade support portion 46, and the multiple reinforcing ribs 47.

[0027] As shown in Figures 5 to 8, the lower end portion 46b of the blade support portion 46 extends gradually downward in the circumferential direction toward the first side X1 (the first side in the circumferential direction). The first swivel blade 48 is provided on the inner surface (the surface facing radially inward) of the lower end portion 46b of the blade support portion 46. The upper surface 48a of the first swivel blade 48 protrudes radially inward from the blade support portion 46 with an inclination angle θ1 of 116°. The upper surface 48a of the first swivel blade 48 is inclined with an inclination angle θ2 of 45° so that it gradually moves downward toward the first side X1 in the circumferential direction. The inclination angle θ2 is the angle of inclination from one side portion 46c to the other side portion 46d of the blade support portion 46 with respect to a plane perpendicular to the axis O1.

[0028] The first swirling blade 48 is brought into contact with the drainage in the upper connecting pipe 30 at the vertical pipe connection section 20, making it easier for the drainage to be locally stagnated near the first swirling blade 48. As a result, the effect of improving the drainage capacity in the upper connecting pipe 30 is significantly achieved. The upper vertical pipe connection section 45, the blade support section 46, the multiple reinforcing ribs 47, and the first swivel blade 48 of the unit body 40 are integrally constructed from polyvinyl chloride resin or the like.

[0029] As shown in Figures 4, 9, and 10, the upper connecting pipe 30 has multiple vertical ribs (backflow prevention ribs) 52 on its inner surface. Multiple vertical ribs 52 are provided on the inner surface of the upper connecting pipe 30, arranged circumferentially on the upper connecting pipe 30. Specifically, the multiple vertical ribs 52 are arranged between adjacent horizontal pipe connection sections 21 in the circumferential direction, and between adjacent horizontal pipe connection sections 21 and the blade support section 46 in the circumferential direction. That is, four sets of multiple vertical ribs 52 are arranged with spacing in the circumferential direction. The multiple vertical ribs 52 are arranged vertically along the axis O1. Of the multiple vertical ribs 52, vertical rib 52A is located below the first swirl blade 48 (see Figure 2). The height of vertical rib 52A is kept low in order to avoid the first swirl blade 48. Vertical rib 52A supports the first swirl blade 48 (see Figure 2) from below. The vertical ribs 52 restrict the backflow of wastewater into the horizontal pipe connection section 21.

[0030] The lower ends 52a of the multiple vertical ribs 52 are located at the same height in the direction of the axis O1. The lower ends 52a of the multiple vertical ribs 52 are located within a first allowable height range, for example, above the lower end 26a of the opening 26 in the horizontal pipe connection 21 and within 25 mm of the lower end 26a of the opening 26. The lower end 26a of the opening 26 is the lowest point of the opening 26 in the direction of the axis O1.

[0031] Here, the horizontal bush 25 has an opening 29. The opening 29 is formed by the end of the horizontal bush 25 that opens into the vertical pipe connection 20. The opening 29 can also be described as the opening of the horizontal bush 25 as viewed from inside the upper connecting pipe 30. The diameter of the opening 29 of the horizontal bush 25 (inner diameter) varies in various ways depending on the diameter of the horizontal pipe P3 (see Figure 1). However, the opening 29 is eccentrically positioned downward with respect to the horizontal pipe connection 21. Here, the axis of the opening 29 is defined as the axis O2 of the horizontal bush 25. In this case, the lower end 52a of the vertical rib 52 may be located in a second allowable height range that is greater than or equal to the lower end 26a of the opening 26 and less than or equal to the axis O2 of the horizontal bush 25. The lower end 52a of the vertical rib 52 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 29a of the opening 29 in the horizontal bush 25, rather than the lower end 26a of the opening 26 in the horizontal pipe connection 21.

[0032] (Intermediate pipe) As shown in Figures 1, 2, 11, and 12, an intermediate pipe 32 is connected to the horizontal pipe junction 36 of the upper connecting pipe 30. The intermediate pipe 32 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 32. The intermediate pipe 32 has, for example, a straight pipe section 60, a first connection port 61, and a second connection port (lower end) 62. In the first embodiment, the first connection port 61 is a "receiving port 61". The second connection port 62 is a "inserting port 62".

[0033] In the first embodiment, the first connection port 61 is described as the "receiving port 61" and the second connection port 62 as the "inserting port 62," but the invention is not limited to this. As other examples, the first connection port 61 may be described as the "inserting port" and the second connection port 62 as the "inserting port." Alternatively, the first connection port 61 may be described as the "receiving port" and the second connection port 62 as the "receiving port." Furthermore, the first connection port 61 may be described as the "inserting port" and the second connection port 62 as the "receiving port."

[0034] The straight pipe section 60 is provided between the receiving port 61 and the insertion port 62 in the direction of the axis O1. The receiving port 61 is provided coaxially at the upper end of the straight pipe section 60. The receiving port 61 is connected by fitting into the horizontal pipe junction 36 of the upper connecting pipe 30. Therefore, the outer surface of the connection portion between the receiving port 61 and the horizontal pipe junction 36 of the upper connecting pipe 30 is the outer surface of the receiving port 61. A socket 62 is provided coaxially at the lower end of the straight pipe section 60. The inner diameters of the straight pipe section 60 and the socket 62 are preferably larger than the inner diameter of the first vertical pipe P1. The socket 62 is connected by fitting into a receiving opening 91 of the lower connecting pipe 33, which will be described later. Therefore, the outer surface of the connection portion between the socket 62 and the receiving opening 91 of the lower connecting pipe 33 is the outer surface of the receiving opening 91.

[0035] As shown in Figures 11 and 12, the straight pipe section 60 is formed with a circular cross-section. The outer diameter of the straight pipe section 60 is the same as the outer diameter of the upper connecting pipe 30. The inner diameter of the straight pipe section 60 is the same as the inner diameter of the upper connecting pipe 30. The straight pipe section 60 has a thickened section 65. The thickened section 65 is integrally molded with the straight pipe section 60. The thickened section 65 is a projection that protrudes radially outward from the side surface of the straight pipe section 60. Hereinafter, the thickened section 65 may be referred to as the "projection 65".

[0036] The protruding portion 65 has a plurality of first ribs 65a and a plurality of second ribs 65b. The plurality of first ribs 65a are provided at intervals in the direction of the axis O1 on the side surface of the straight pipe portion 60. The plurality of first ribs 65a are formed in an annular shape by extending circumferentially along the side surface of the straight pipe portion 60. The plurality of second ribs 65b are provided at intervals in the direction of the axis O1 on the side surface of the straight pipe portion 60. The plurality of second ribs 65b are formed in a linear shape by extending axially along the side surface of the straight pipe portion 60.

[0037] Multiple first ribs 65a and multiple second ribs 65b are provided across the entire side surface of the straight pipe section 60. Multiple first ribs 65a and multiple second ribs 65b are arranged perpendicular to each other. The outer surfaces of the multiple first ribs 65a and the multiple second ribs 65b are formed flush with each other. The outer surfaces of the multiple first ribs 65a and the multiple second ribs 65b form the "outer surface of the straight pipe section 60". The outer surface of the straight pipe section 60 is the same outer surface as the outer surface of the receiving opening 61 in the intermediate pipe 32 and the outer surface of the receiving opening 91 (described later) in the lower connecting pipe 33.

[0038] In the first embodiment, an example is described in which both the multiple first ribs 65a and the multiple second ribs 65b are provided as the protruding portion 65, but the invention is not limited to this. As another example, either the multiple first ribs 65a or the multiple second ribs 65b may be used as the protruding portion 65.

[0039] Here, the intermediate pipe 32 has a first recess 67 and a second recess 68. The first recess 67 is formed at the upper end of the receiving opening 61. By fitting the first recess 67 into the protrusion 38 (see Figure 3) of the upper connecting pipe 30, the intermediate pipe 32 can be positioned circumferentially relative to the upper connecting pipe 30. The second recess 68 is formed in the lowest of the multiple first ribs 65a. By fitting the second recess 68 into the protrusion 95 (see Figure 15) of the lower connecting pipe 33, the lower connecting pipe 33 can be positioned circumferentially relative to the intermediate pipe 32. Here, as shown in Figure 2, the first swivel blade 48 is positioned circumferentially with respect to the upper connecting pipe 30. Therefore, by positioning the intermediate pipe 32 circumferentially with respect to the upper connecting pipe 30, and positioning the lower connecting pipe 33 circumferentially with respect to the intermediate pipe 32, the third swivel blade 100 (described later) of the lower connecting pipe 33 can be positioned circumferentially with respect to the first swivel blade 48.

[0040] (Modified Intermediate Tube 1) As shown in Figure 13, the intermediate pipe 32 in the first embodiment may be replaced with an intermediate pipe 72. The intermediate pipe 72 is a replacement of the straight pipe section 60 in the first embodiment with a straight pipe section 73. The straight pipe section 73 is formed with a circular cross-section. The straight pipe section 73 has a thickened section 74 with a constant thickness around its entire circumference. The outer surface of the entire circumference of the straight pipe section 73 is the same as the outer surface of the receiving opening 61 in the intermediate pipe 72 and the outer surface of the receiving opening 91 (described later) in the lower connecting pipe 33.

[0041] (Modified intermediate tube, part 2) As shown in Figure 14, the intermediate pipe 72 in Modification 1 may be replaced with an intermediate pipe 82. The intermediate pipe 82 replaces the straight pipe section 73 in Modification 1 with a straight pipe section 83, and the spigot 62 in Modification 1 with a receiving opening 85. The outer surface of the entire circumference of the straight pipe section 83 is the same as the outer surface of the receiving opening 61 and the receiving opening 85 in the intermediate pipe 82. Furthermore, the straight pipe section 83 has a plurality of grooves 86 on its inner surface. The plurality of grooves 86 are spaced apart in the circumferential direction. The plurality of grooves 86 are recessed radially outward from the inner surface of the straight pipe section 83 and extend in the direction of the axis O1. Therefore, the wall thickness of the straight pipe section 83 can be reduced at intervals in the circumferential direction.

[0042] Here, on the inner surface of the straight pipe section 83, ribs 87 are formed between a plurality of grooves 86 in the circumferential direction. The plurality of ribs 87 protrude radially inward and extend in the direction of the axis O1. Therefore, the upper ends of the plurality of ribs 87 abut against the horizontal pipe junction 36 (see Figure 2) of the upper connecting pipe 30 when the receiving end 61 of the intermediate pipe 82 is fitted into the horizontal pipe junction 36, and act as stoppers. Also, the lower ends of the plurality of ribs 87 abut against the spigot (not shown) of the lower connecting pipe 33 when the receiving end 85 of the intermediate pipe 82 is fitted into the spigot (not shown) of the lower connecting pipe 33, and act as stoppers.

[0043] (Lower connecting pipe) As shown in Figures 1 to 3 and Figure 15, the lower connecting pipe 33 consists of a pipe body that is narrower in diameter at the bottom than at the top. The lower connecting pipe 33 is located below the intermediate pipe 32. The lower connecting pipe 33 has a receiving opening (upper end) 91 located at its upper end and connected to the inlet 62 of the intermediate pipe 32, a connecting pipe section 92 provided at the lower end of the receiving opening 91, a tapered section 93 that narrows downwards provided at the lower end of the connecting pipe section 92, and a lower pipe section 94 provided at the lower end of the tapered section 93 to which the second vertical pipe P2 is connected. The lower connecting pipe 33 is integrally formed, for example, by injection molding of a synthetic resin material.

[0044] The lower pipe section 94 connects to the second vertical pipe P2 below the tapered section 93. The outer diameter of the lower pipe section 94 is the minimum outer diameter of the vertical pipe connection section 20 below the tapered section 93. The minimum outer diameter is between 110 mm and 120 mm. The tapered section 93 is inclined to decrease in diameter downward from the lower end of the connecting pipe section 92 to the lower pipe section 94. The inclination angle θ3 of the tapered section 93 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. When the manifold joint 10 is installed on the floor slab S using a branch-floating construction method, it is preferable that at least the upper half of the tapered section 93 is positioned in the through hole H of the floor slab S.

[0045] The inner diameter of the socket 91 is larger than the spigot 62 of the intermediate pipe 32. The spigot 62 of the intermediate pipe 32 is fitted inside the socket 91. The outer diameter of the connecting pipe section 92 is smaller than the outer diameter of the socket 91. The outer diameter of the socket 91 is the maximum outer diameter of the vertical pipe connection section 20. The maximum outer diameter of the vertical pipe connection section 20 is between 180 mm and 195 mm.

[0046] Since the outer diameter of the connecting pipe section 92 is smaller than the outer diameter of the receiving opening 91, a circumferential step is formed at the boundary between the receiving opening 91 and the connecting pipe section 92. On the side surface of the connecting pipe section 92, a first rib 96 and a second rib 97 are provided, similar to the protruding portion 65 in the intermediate pipe 32. The outer surfaces of the first rib 96 and the second rib 97 form the outer surface of the connecting pipe section 92. Therefore, the outer surface of the connecting pipe section 92 is formed on the same outer surface as the outer surface of the receiving opening 91, the outer surface of the straight pipe section 60 in the intermediate pipe 32, and the outer surface of the receiving opening 61 in the intermediate pipe 32.

[0047] As shown in Figures 1, 3, and 16, the outer diameter at the upper end of the tapered section 93 is the same as the outer diameter of the connecting pipe section 92. The outer diameter at the lower end of the tapered section 93 is smaller than the outer diameter at the upper end of the tapered section 93. A third swivel blade 100 is provided on the inner surface of the intermediate portion in the vertical direction of the tapered section 93. The third swivel blade 100 gradually extends toward the first side X1 in the circumferential direction as it goes from top to bottom. More specifically, the surface 100a of the third swivel blade 100 facing the first side X1 gradually extends toward the first side X1 as it goes from top to bottom. The surface 100b of the third swivel blade 100 facing the second side X2 in the circumferential direction gradually extends toward the first side X1 as it goes from top to bottom.

[0048] As shown in Figures 16 to 18, the third swivel blade 100 is inclined downward from its upper end 100c to its lower end 100d with an inclination angle θ4 of 68°. The inclination angle θ4 is the angle of inclination from the upper end 100c to the lower end 100d with respect to a plane perpendicular to the axis O1. The total length of the third swivel blade 100 is 150 mm. The total length is the length from the upper end 100c to the lower end 100d. Furthermore, the third swivel blade 100 protrudes, for example, from the outside to the inside of the tapered portion 93, with an inclination angle θ5 of 30° with respect to the radial direction. The width (circumferential size) of the third swivel blade 100 is 36 mm. The width of the third swivel blade 100 is the width from the inner edge 99e to the outer edge 100f of the third swivel blade 100 when viewed radially from the axis O1. The third swivel vane 100 alters the flow of drainage through the lower connecting pipe 33, causing it to swirl.

[0049] The outer diameter of the lower pipe section 94 is smaller than the outer diameter of the receiving opening 61 in the intermediate pipe 32. The second vertical pipe P2 in the lower floor F2 is fitted from below onto the outside of the lower pipe section 94, thereby connecting the second vertical pipe P2 to the lower connecting pipe 33. In the first embodiment, an example is described in which the lower pipe section 94 is a spline for the second vertical pipe P2, but the lower pipe section 94 may also be a receiving opening for the second vertical pipe P2.

[0050] (Fireproof material) As shown in Figures 1 to 3, the fire-resistant material 12 is provided on the outer surface of the vertical pipe connection 20. The fire-resistant material 12 is covered by the lower sound insulation cover 14, which will be described later. That is, the fire-resistant material 12 is provided between the vertical pipe connection 20 and the lower sound insulation cover 14. The fire-resistant material 12 is provided, for example, in the direction of the axis O1, at a position that avoids the first swivel vane 48, the multiple vertical ribs 52, and the third swivel vane 100.

[0051] The height H2 of the fire-resistant material 12 is preferably more than 150 mm and 300 mm or less in the direction of the axis O1. In the first embodiment, as an example, the height H2 of the fire-resistant material 12 is 210 mm and the thickness of the fire-resistant material 12 is 2 mm. The height H2 of the fire-resistant material 12 is preferably higher than the height of the intermediate pipe 32. When the manifold joint 10 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 12 is positioned in the through-hole H of the floor slab S.

[0052] Examples of the fire-resistant material 12 include a fire-resistant sheet 110 made of resin containing thermally expandable graphite. The fire-resistant sheet 110 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 the material consists of a resin binder and an inorganic filler. Specifically, the fire-resistant sheet 110 is formed from, for example, Fiblock (registered trademark), a commercially available product manufactured by Sekisui Chemical Co., Ltd.

[0053] The fire-resistant sheet 110 is placed, for example, on the outer surface of the receiving opening 61 of the intermediate pipe 32, the outer surface of the straight pipe section 60 of the intermediate pipe 32, the outer surface of the receiving opening 91 of the lower connecting pipe 33, and the outer surface of the connecting pipe section 92 of the lower connecting pipe 33. By attaching the fire-resistant sheet 110 to the receiving opening 61 of the intermediate pipe 32, the straight pipe section 60 of the intermediate pipe 32, the receiving opening 91 of the lower connecting pipe 33, and the connecting pipe section 92 of the lower connecting pipe 33, the height H2 of the fire-resistant material 12 can be made 210 mm. Preferably, the upper end 12a of the fire-resistant material 12 is located 15 mm below the lower end of the outer surface of the horizontal pipe connection section 21. Furthermore, the thermal expansion coefficient of the fire-resistant material 12 is preferably 1.3 times or more and 100 times or less.

[0054] Here, the reason for setting the height H2 of the fire-resistant material 12 to 210 mm and the thermal expansion coefficient of the fire-resistant material 12 to be 1.3 times or more and 100 times or less will be explained based on Figures 19 to 24. Figures 19 to 24 show examples of installing the manifold joint 10 on the floor slab S using branch floating construction and normal construction, when the slab thickness T of the floor slab S is 150 mm, 100 mm, and 75 mm.

[0055] First, we will explain the case where the slab thickness T of the floor slab S is 150 mm, based on Figures 19 and 20. As shown in Figure 19, the manifold joint 10 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 12 to 210 mm, it is possible to embed 85 mm of the fire-resistant material 12 into the through-hole H.

[0056] Furthermore, when the slab thickness T of the floor slab S is 150 mm, at least the upper half of the tapered portion 93 can be embedded in the through hole H of the floor slab S. In addition, the inclination angle θ3 of the tapered portion 93 is set to 80° or more and 85° or less. Therefore, the tapered portion 93 can suppress the shedding of residue of the fire-resistant material 12 generated by flames in the floor below F2 of the floor slab S. The suppression of residue shedding will be explained in detail later.

[0057] Alternatively, as shown in Figure 20, the manifold joint 10 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 12 to 210 mm, 135 mm of the fire-resistant material 12 can be embedded in the through-hole H. Therefore, a large area of ​​embedding for the fire-resistant material 12 can be secured. As a result, if a flame occurs in the floor below F2 of the floor slab S, the fire-resistant material 12 will expand due to heat, thereby properly sealing the through-hole H.

[0058] As shown in Figures 19 and 20, when the slab thickness T is 150 mm, by setting the height H2 of the fire-resistant material 12 to 210 mm, fire resistance can be ensured by the fire-resistant material 12 in the event of a fire occurring on the floor below F2 of the floor slab S.

[0059] Next, we will explain the case where the slab thickness T of the floor slab S is 100 mm, based on Figures 21 and 22. As shown in Figure 21, the joint 10 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 12 to 210 mm, 85 mm of the fire-resistant material 12 can be embedded in the through-hole H. In this case, by setting the thermal expansion coefficient of the fire-resistant material 12 to be between 1.3 and 100 times, the thermal expansion of the fire-resistant material 12 can properly close the through-hole H.

[0060] Alternatively, as shown in Figure 22, the manifold joint 10 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 12 to 210 mm, 85 mm of the fire-resistant material 12 can be embedded in the through-hole H. In this case, by setting the thermal expansion coefficient of the fire-resistant material 12 to be between 1.3 and 100 times, the thermal expansion of the fire-resistant material 12 can properly seal the through-hole H.

[0061] Next, we will explain the case where the slab thickness T of the floor slab S is 75 mm, based on Figures 23 and 24. As shown in Figure 23, the jointed connector 10 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 12 to 210 mm, a 75 mm portion of the fire-resistant material 12 can be embedded in the through-hole H. In this case, by setting the thermal expansion coefficient of the fire-resistant material 12 to be between 1.3 and 100 times, the thermal expansion of the fire-resistant material 12 can properly close the through-hole H.

[0062] Alternatively, as shown in Figure 24, the manifold joint 10 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 12 can be embedded in the through-hole H. In this case, by setting the thermal expansion coefficient of the fire-resistant material 12 to be between 1.3 and 100 times, the thermal expansion of the fire-resistant material 12 can properly seal the through-hole H.

[0063] As shown in Figures 22 and 24, when the slab thickness T is 75 mm and 100 mm, it is preferable to set the height H2 of the fire-resistant material 12 to 210 mm and the thermal expansion coefficient of the fire-resistant material 12 to be between 1.3 times and 100 times. Therefore, if flames occur on the floor below F2 of the floor slab S, fire resistance can be ensured by the fire-resistant material 12. By setting the height H2 of the fire-resistant material 12 to 210 mm and the thermal expansion coefficient of the fire-resistant material 12 to be between 1.3 times and 100 times, it is also possible to keep the thickness of the floor slab S to less than 100 mm.

[0064] In the first embodiment, an example is described in which the fire-resistant material 12 covers the joint body 11 from the intermediate pipe 32 to the lower connecting pipe 33, but the invention is not limited to this. As another example, the fire-resistant material 12 may be covered on the joint body 11 from the upper connecting pipe 30 to the intermediate pipe 32. Alternatively, the fire-resistant material 12 may be covered on the joint body 11 from the intermediate pipe 32 to the lower connecting pipe 33.

[0065] As shown in Figures 1 and 25, the fire-resistant material 12 may have multiple fire-resistant sheets 112. The width of the fire-resistant sheet 112 is formed to be narrower than, for example, the width from the receiving opening 61 of the intermediate pipe 32 to the connecting pipe section 92 of the lower connecting pipe 33 in the axial direction O1. The multiple fire-resistant sheets 112 are arranged wrapped around the outer surfaces of the receiving opening 61 of the intermediate pipe 32, the straight pipe section 60 of the intermediate pipe 32, the receiving opening 91 of the lower connecting pipe 33, and the connecting pipe section 92 of the lower connecting pipe 33 in the circumferential direction. Multiple fire-resistant sheets 112 are arranged so that adjacent fire-resistant sheets 112 overlap or butt together in the direction of the axis O1 of the vertical pipe connection section 20. Therefore, the fire-resistant material 12 formed by multiple fire-resistant sheets 112 can cover the outer surfaces of the receiving opening 61 of the intermediate pipe 32, the straight pipe section 60 of the intermediate pipe 32, the receiving opening 91 of the lower connecting pipe 33, and the connecting pipe section 92 of the lower connecting pipe 33.

[0066] Here, multiple second ribs 65b are provided on the outer surface of the straight pipe section 60 of the intermediate pipe 32 at intervals in the direction of the axis O1. The multiple second ribs 65b extend along the outer surface of the straight pipe section 60 in the direction of the axis O1. The outer surfaces of the multiple second ribs 65b are formed on the same plane as the outer surface of the receiving opening 61 of the intermediate pipe 32 and the outer surface of the receiving opening 91 of the lower connecting pipe 33. Multiple fire-resistant sheets 114 are arranged on the outer surfaces of the multiple second ribs 65b. Therefore, multiple fire-resistant sheets 114 can be appropriately arranged on the outer surface of the intermediate pipe 32 while suppressing the occurrence of wrinkles.

[0067] Next, we will explain the construction method for the joint 10, which is used to install multiple fire-resistant sheets 112. First, multiple fire-resistant sheets 112 are wrapped around the outer surfaces of the receiving opening 61 of the intermediate pipe 32, the straight section 60 of the intermediate pipe 32, the receiving opening 91 of the lower connecting pipe 33, and the connecting section 92 of the lower connecting pipe 33 in the circumferential direction. At this time, adjacent fire-resistant sheets 112 are overlapped or butted together in the direction of the axis O1. Thus, multiple fire-resistant sheets 112 can be arranged continuously on the outer surfaces of the receiving opening 61 of the intermediate pipe 32, the straight section 60 of the intermediate pipe 32, the receiving opening 91 of the lower connecting pipe 33, and the connecting section 92 of the lower connecting pipe 33. In other words, a fire-resistant material 12 can be formed to cover the outer surfaces of the receiving end 61 of the intermediate pipe 32, the straight pipe section 60 of the intermediate pipe 32, the receiving end 91 of the lower connecting pipe 33, and the connecting pipe section 92 of the lower connecting pipe 33. This completes the construction method for the manifold joint 10, in which the fire-resistant material 12 is formed using multiple fire-resistant sheets 112.

[0068] Here, multiple fire-resistant sheets 112 may be placed on the intermediate pipe 32 before the construction of connecting the upper connecting pipe 30, intermediate pipe 32, and lower connecting pipe 33 of the vertical pipe connection section 20. Here, the fire-resistant sheets 112 wrapped around the intermediate pipe 32 form a joint (not shown) where both ends are joined. This joint can be used for positioning when assembling the vertical pipe connection section 20. Specifically, for example, the joints at both ends of a single fire-resistant sheet 112 are designated as positioning sections (not shown). Based on these positioning sections, the upper connecting pipe 30 and the lower connecting pipe 33, which are connected to the intermediate pipe 32, are positioned in the circumferential direction. This allows the third swivel vane 100 of the lower connecting pipe 33 to be positioned in the circumferential direction relative to the first swivel vane 48 of the upper connecting pipe 30.

[0069] (Example 1 of fire-resistant material) As shown in Figures 1 and 26, the multiple fire-resistant sheets 110 in the first embodiment may be replaced with multiple fire-resistant sheets 114. The length of the fire-resistant sheet 114 is, for example, formed to the length from the receiving opening 61 of the intermediate pipe 32 to the connecting pipe portion 92 of the lower connecting pipe 33. The width of the fire-resistant sheet 114 is, for example, formed to be narrower than the circumference of the receiving opening 61 of the intermediate pipe 32, the straight pipe portion 60 of the intermediate pipe 32, the receiving opening 91 of the lower connecting pipe 33, and the connecting pipe portion 92 of the lower connecting pipe 33. The multiple fire-resistant sheets 114 are arranged along the axis O1 on the outer surfaces of the receiving opening 61 of the intermediate pipe 32, the straight pipe portion 60 of the intermediate pipe 32, the receiving opening 91 of the lower connecting pipe 33, and the connecting pipe portion 92 of the lower connecting pipe 33.

[0070] Multiple fire-resistant sheets 114 are arranged so that adjacent fire-resistant sheets 110 overlap or butt together in the circumferential direction of the vertical pipe connection section 20. Therefore, the fire-resistant material 12 formed by multiple fire-resistant sheets 114 can cover the outer surfaces of the receiving end 61 of the intermediate pipe 32, the straight pipe section 60 of the intermediate pipe 32, the receiving end 91 of the lower connecting pipe 33, and the connecting pipe section 92 of the lower connecting pipe 33.

[0071] Here, multiple first ribs 65a are provided on the outer surface of the straight pipe section 60 of the intermediate pipe 32 at intervals in the direction of the axis O1. The multiple first ribs 65a are formed in an annular shape by extending circumferentially along the outer surface of the straight pipe section 60. The outer surfaces of the multiple first ribs 65a are formed on the same plane as the outer surface of the receiving opening 61 of the intermediate pipe 32 and the outer surface of the receiving opening 91 of the lower connecting pipe 33. Multiple fire-resistant sheets 114 are arranged on the outer surfaces of the multiple first ribs 65a. Therefore, the multiple fire-resistant sheets 114 can be appropriately arranged on the outer surface of the intermediate pipe 32 while suppressing the occurrence of wrinkles.

[0072] Next, we will explain the construction method for the joint 10 in which multiple fire-resistant sheets 114 are installed in the modified example 1. First, multiple fire-resistant sheets 114 are arranged along the axis O1 of the vertical pipe connection 20 on the outer surfaces of the receiving opening 61 of the intermediate pipe 32, the straight section 60 of the intermediate pipe 32, the receiving opening 91 of the lower connecting pipe 33, and the connecting section 92 of the lower connecting pipe 33. At this time, adjacent fire-resistant sheets 114 are overlapped or butted together in the circumferential direction of the vertical pipe connection 20. Thus, multiple fire-resistant sheets 114 can be arranged continuously on the outer surfaces of the receiving opening 61 of the intermediate pipe 32, the straight section 60 of the intermediate pipe 32, the receiving opening 91 of the lower connecting pipe 33, and the connecting section 92 of the lower connecting pipe 33. In other words, a fire-resistant material 12 can be formed that covers the outer surfaces of the receiving opening 61 of the intermediate pipe 32, the straight section 60 of the intermediate pipe 32, the receiving opening 91 of the lower connecting pipe 33, and the connecting section 92 of the lower connecting pipe 33. This completes the construction method for the joint 10, which forms the fire-resistant material 12 with multiple fire-resistant sheets 114.

[0073] Here, multiple fire-resistant sheets 114 may be placed on the intermediate pipe 32 before the construction of connecting the upper connecting pipe 30, intermediate pipe 32, and lower connecting pipe 33 of the vertical pipe connection section 20. Here, when fire-resistant sheets 114 are placed on the intermediate pipe 32, a joint (not shown) is formed by overlapping or butting adjacent fire-resistant sheets 114. At least one of these joints can be used for positioning when assembling the vertical pipe connection section 20. 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 30 and the lower connecting pipe 33, which are connected to the intermediate pipe 32, are positioned in the circumferential direction. This allows the third swivel vane 100 of the lower connecting pipe 33 to be positioned in the circumferential direction relative to the first swivel vane 48 of the upper connecting pipe 30.

[0074] (Upper soundproofing cover) As shown in Figures 1 to 3, the upper sound insulation cover 13 is positioned to surround the outer surface of the upper connecting pipe 30 of the joint body 11. Specifically, the upper sound insulation cover 13 has a sound-absorbing sheet 120 that is wrapped around the upper connecting pipe 30 from the radial outside to cover the upper connecting pipe 30, and a sound insulation sheet 121 that covers the sound-absorbing sheet 120. The sound-absorbing sheet 120 and the sound insulation sheet 121 are both flexible.

[0075] The sound-absorbing sheet 120 is formed of a sound-absorbing material such as needle felt. The sound-absorbing sheet 120 has a surface density of, for example, 1.0 kg / m². 2 The sheet has a thickness of 10 mm. The sound-absorbing sheet 120 has three first fitting openings (not shown) into which the horizontal pipe connection portion 21 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 21 is inserted through the first fitting openings, they are widened laterally to take on a circular shape.

[0076] The sound insulation sheet 121 is formed of, for example, an olefin-based sound insulation material. The sound insulation sheet 121 has, for example, a surface density of 3.44 kg / m². 2The sound insulation sheet 121 has a thickness of 2 mm. The sound insulation sheet 121 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 21 is inserted through the second fitting opening, it is widened laterally to take on a circular shape.

[0077] When wrapping the sound insulation sheet 121 around the radially outer side of the sound absorbing sheet 120, the sound insulation sheet 121 is elastically deformed so that the second fitting opening (not shown) expands, and the horizontal pipe connection portion 21 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 121, 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 21.

[0078] The lateral ends of the sound insulation sheet 121 are connected to each other at the portion of the side surface of the upper connecting pipe 30 where the horizontal pipe connection portion 21 does not protrude. The sound absorbing sheet 120 and the sound insulation sheet 121, which are wrapped around the upper connecting pipe 30, are each formed in an annular shape.

[0079] The upper sound insulation cover 13 is provided so as to surround the outer surface of the upper connecting pipe 30 when the sound-absorbing sheet 120 is wrapped around the upper connecting pipe 30 and the sound-absorbing sheet 120 is covered with the sound insulation sheet 121. In this state, the lower end 13a of the upper sound insulation cover 13 can be positioned, for example, on the receiving opening 61 of the intermediate pipe 32. Also, the lower end 13a of the upper sound insulation cover 13 can be positioned above (on the upper floor) the floor slab S when the manifold joint 10 is installed in a branch-floor configuration.

[0080] (Lower soundproofing cover) The lower sound insulation cover 14 is provided below the upper sound insulation cover 13 in the direction of the axis O1. The lower sound insulation cover 14 is provided in the joint body 11 so as to cover the portion from the upper end 12a of the fire-resistant material 12 through the tapered portion 93 to the lower pipe portion 94. That is, the lower sound insulation cover 14 integrally covers the intermediate pipe 32 and the lower connecting pipe 33. In the first embodiment, an example in which the intermediate pipe 32 and the lower connecting pipe 33 are integrally covered by the lower sound insulation cover 14 is described, but it is not limited to this. As another example, for example, the lower sound insulation cover 14 may be provided integrally below the horizontal pipe connection portion 21 so as to indirectly cover the upper connecting pipe 30 via the intermediate pipe 32. The upper end 14a of the lower sound insulation cover 14 is positioned, for example, at the receiving opening 61 of the intermediate pipe 32. The upper end 14a of the lower sound insulation cover 14 is abutted, for example, at the lower end 13a of the upper sound insulation cover 13.

[0081] The lower sound insulation cover 14 has a two-layer structure, consisting of an inner layer a made of sound-absorbing material such as rock wool, and an outer layer b made of sound-insulating material such as EPDM (ethylene propylene diene rubber). Specifically, the inner layer a is made of fibers such as needle felt. The inner layer a has a surface density of, for example, 1.0 kg / m². 2 The outer layer b is 5 mm thick. The outer layer b is made of a resin containing an olefin-based rubber component. The outer layer b has a surface density of, for example, 4.8 kg / m². 2 The thickness is 3 mm. The outer layer b is integrally molded, for example, by injection molding.

[0082] In other words, the lower sound insulation cover 14 is formed integrally in a tubular shape without being divided in the direction of the axis O1. The lower sound insulation cover 14 is fitted, for example, to the portion from the upper end 12a of the fire-resistant material 12 to the lower end of the tapered portion 93. The lower sound insulation cover 14 covers the outer surface of the fire-resistant material 12 and the outer surface of the tapered portion 93. Therefore, the lower sound insulation cover 14 has an inclined portion 130 that covers the tapered portion 93 and a straight portion 131 integrally formed at the upper end of the inclined portion 130.

[0083] The inclined portion 130 is inclined along the tapered portion 93 so as to decrease in diameter downwards. Here, the inclination angle θ3 of the tapered portion 93 is 80° or more and 85° or less. Therefore, when the inclined portion 130 is inclined along the tapered portion 93, the inclination angle θ6 of the inclined portion 130 is 70° or more and 89° or less. The inclined portion 130 is in contact with the filler material M. The straight section 131 is formed with the same diameter from the upper end of the inclined section 130 to the upper end of the lower sound insulation cover 14. The outer diameter of the straight section 131 is the maximum outer diameter of the lower sound insulation cover 14. The maximum outer diameter of the lower sound insulation cover 14 is the maximum outer diameter of the manifold joint 10. The maximum outer diameter of the manifold joint 10 is between 180 mm and 195 mm. Furthermore, the inner layer a may be a two-layer structure consisting of a fire-resistant material such as fiber-reinforced mortar and an outer layer made of a sound-insulating sheet.

[0084] The outer layer b of the lower sound insulation cover 14 may have irregularities on its outer surface. The reason for having irregularities on the outer surface of the outer layer b will be explained in detail later. Furthermore, a fibrous mortar layer (not shown) covering the lower sound insulation cover 14 may be provided in the manifold joint 10. The reason for providing a fibrous mortar layer covering the lower sound insulation cover 14 in the manifold joint 10 will be explained in detail later.

[0085] In the first embodiment, an example is described in which an upper sound insulation cover 13 and a lower sound insulation cover 14 are provided, but it is also possible to provide only the lower sound insulation cover 14, only the upper sound insulation cover 13, or neither.

[0086] (Fixing tape) The fixing tape 15 is wrapped around the lower end 13a of the upper sound insulation cover 13 and the upper end 14a of the lower sound insulation cover 14 from the radially outward direction and adhered to their respective outer surfaces. The fixing tape 15 is positioned on the outer surface of the lower end 13a of the upper sound insulation cover 13 and the outer surface of the upper end 14a of the lower sound insulation cover 14. The outer surfaces of the upper sound insulation cover 13 and the lower sound insulation cover 14 are the outermost surfaces of the maximum outer diameter at the horizontal pipe confluence 36. In other words, the fixing tape 15 is located on the outermost surface at the horizontal pipe confluence 36. The lower end 13a of the upper sound insulation cover 13 and the upper end 14a of the lower sound insulation cover 14 are abutted against the receiving opening 61 of the intermediate pipe 32. Therefore, the lower end 13a of the upper sound insulation cover 13 and the upper end 14a of the lower sound insulation cover 14 are fixed to the outer surface of the receiving opening 61 of the intermediate pipe 32 with fixing tape 15.

[0087] The fixing tape 15 is made of a material such as a butyl rubber sheet with a polyolefin film. The fixing tape 15 can waterproof the area to which it is attached. Furthermore, the upper sound insulation cover 13 and the lower sound insulation cover 14 are fixed with fixing tape 15 so as to cover the vertical pipe connection part 20. As a result, the joint body 11 has excellent sound insulation properties. For example, even if drainage passes through the inside of the joint body 11, the structure makes it difficult for drainage sound to leak to the outside.

[0088] Here, the lower end 13a of the upper sound insulation cover 13 and the upper end 14a of the lower sound insulation cover 14 are fixed to the receiving opening 61 of the intermediate pipe 32 with fixing tape 15. Therefore, the upper end of the fixing tape can be positioned, for example, at the top of the horizontal pipe junction 36. The uppermost point of the horizontal pipe junction 36 is the highest point of the vertical pipe connection 20 below the horizontal pipe connection 21. More specifically, the uppermost point of the horizontal pipe junction 36 is the position in the horizontal pipe junction 36 corresponding to the lower outer surface end 21a of the horizontal pipe connection 21. Therefore, for example, the fixing tape 15 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 10 is installed in a branch-floor configuration, the fixing tape 15 can be placed above the floor slab S (i.e., at a higher position than the floor slab S).

[0089] In the first embodiment, an example is described in which an upper sound insulation cover 13 and a lower sound insulation cover 14 are provided, but the invention is not limited to this. As another example, even when the manifold joint 10 is provided only with a lower sound insulation cover 14, the fixing tape 15 may also be applied. Specifically, with the fixing tape 15 attached (positioned) to the upper end 14a of the lower sound insulation cover 14, the upper end of the fixing tape 15 is wrapped around the outer surface of the receiving opening 61 in the intermediate pipe 32 from the outside and attached. The upper end 14a of the lower sound insulation cover 14 is fixed to the outer surface of the receiving opening 61 in the intermediate pipe 32 by the fixing tape 15.

[0090] In this case, the fixing tape 15 is positioned on the outer surface of the lower sound insulation cover 14 and the outer surface of the receiving opening 61 in the intermediate pipe 32. The outer surface of the lower sound insulation cover 14 and the outer surface of the receiving opening 61 in the intermediate pipe 32 are the outermost surfaces of the maximum outer diameter in the horizontal pipe junction 36. In this state, the upper end of the fixing tape 15 can be positioned, for example, at the highest point of the horizontal pipe junction 36. Alternatively, the upper end of the fixing tape 15 can be positioned, for example, at the outermost surface of the horizontal pipe junction 36. The reason for positioning the upper end of the fixing tape 15 at the top of the horizontal pipe junction 36 will be explained in detail later.

[0091] (Installation of manifold joint) As shown in Figure 1, the manifold joint 10 is installed on the floor slab S by a branch-floating construction method, in which the horizontal pipe connection portion 21 is raised above the surface of the floor slab S by a predetermined distance. The process of installing the manifold joint 10 on the floor slab S by branch-floating construction method will be described below with reference to Figure 1.

[0092] As shown in Figures 1 and 2, fire-resistant material 12 is attached to the vertical pipe connection portion 20 of the joint body 11. Next, the upper sound insulation cover 13 and the lower sound insulation cover 14 are attached to the vertical pipe connection portion 20. The lower end 13a of the attached upper sound insulation cover 13 and the upper end 14a of the lower sound insulation cover 14 are secured with fixing tape 15. The assembly of the manifold joint 10 is completed by attaching the fire-resistant material 12, the upper sound insulation cover 13, the lower sound insulation cover 14, and the fixing tape to the vertical pipe connection portion 20.

[0093] The manifold joint 10 is inserted into the through-hole H of the floor slab S. The manifold joint 10 is installed so that at least the upper half of the straight pipe section 60 of the intermediate pipe 32, the receiving end 91 of the lower connecting pipe 33, the connecting pipe section 92 of the lower connecting pipe 33, and the tapered section 93 of the lower connecting pipe 33 are positioned in the through-hole H of the floor slab S. With the manifold joint 10 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 94 of the lower connecting pipe 33. In this state, for example, at least the lower half of the fire-resistant material 12 and the inclined portion 130 of the lower sound insulation cover 14 are housed inside the through hole H.

[0094] Next, the lower end of the first vertical pipe P1 on the upper floor F1 is fitted into the upper vertical pipe connection part 45 and the sealing member 41 of the vane unit 31, thereby connecting the first vertical pipe P1 to the vertical pipe connection part 20. By connecting the upper end of the second vertical pipe P2 to the lower pipe section 94 of the lower connecting pipe 33, and connecting the lower end of the first vertical pipe P1 to the vertical pipe connection section 20, the horizontal pipe connection section 21 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.

[0095] 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 10 (specifically, the lower sound insulation cover 14). In this state, the inclined portion 130 of the lower sound insulation cover 14 is embedded in the filler material M. Also, at least the lower half of the fire-resistant material 12 is embedded in the filler material M. Furthermore, at least the upper half of the straight pipe portion 60 of the intermediate pipe 32, the receiving end 91 of the lower connecting pipe 33, the connecting pipe portion 92 of the lower connecting pipe 33, and the tapered portion 93 of the lower connecting pipe 33 is embedded in the filler material M. It is preferable to use mortar with excellent residue retention properties as the filler material M.

[0096] With the through-hole H filled with filler M, the end of the horizontal pipe P3 is inserted into the horizontal bush 25 of the horizontal pipe connection part 21 to connect the horizontal pipe P3 to the horizontal pipe connection part 21. Therefore, for example, the horizontal pipe P3 can be positioned at a height that corresponds to the toilet outlet. This completes the process of installing the manifold joint 10 on the floor slab S by branch-floating construction.

[0097] The effects and advantages of the floor structure 1, the manifold joint 10, and the construction method of the manifold joint 10 according to the first embodiment described above will be explained with reference to Figures 1 to 26.

[0098] Specifically, the diameter of the through-hole H in the floor slab S was set to 210 mm or more and 300 mm or less. Therefore, the diameter of the through-hole H can be matched to the maximum outer diameter of the manifold joint 10 (for example, the lower sound insulation cover 14 or the vertical pipe connection part 20). This makes it easier to install the manifold joint 10 into the floor slab S.

[0099] Furthermore, the inclination angle θ3 of the tapered portion 93 in the vertical pipe connection portion 20 was set to 80° or more and 85° or less. Also, the inclination angle θ6 of the inclined portion 130 in the lower sound insulation cover 14 covering the tapered portion 93 was set to 70° or more and 89° or less. By setting the inclination angle θ6 of the inclined portion 130 to 70° or more and 89° or less, the tapered shape (inclined shape) of the inclined portion 130 is transferred to the filler material M, and the inner surface of the filler material M also becomes tapered (inclined). Therefore, for example, the shedding of residue of the fire-resistant material 12 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 10 can be realized.

[0100] Furthermore, the inclination angle θ3 of the tapered portion 93 was set to 80° or more and 85° or less. Therefore, when the lower sound insulation cover 14 is absent, the tapered shape of the tapered portion 93 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 12 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 10 can be realized.

[0101] If the inclination angle θ3 of the tapered section 93 is too small, for example, drainage may skip inside the manifold joint 10, reducing drainage performance. Therefore, by setting the inclination angle θ3 of the tapered section 93 to 80° or more, the inclination angle θ3 of the tapered section 93 is appropriately secured. This ensures that the drainage flow inside the manifold joint 10 is properly maintained and drainage performance is ensured.

[0102] Furthermore, the lower sound insulation cover 14 is combined with a two-layer structure consisting of an inner layer a and an outer layer b. Inner layer a is made of fibers with excellent sound absorption properties. Outer layer b is made of a resin containing rubber components with excellent sound insulation properties. As a result, the lower sound insulation cover 14 can suppress the leakage of water noise from the manifold joint 10 to the outside of the manifold joint as the drainage passes through the inside of the manifold joint 10.

[0103] Furthermore, the lower sound insulation cover 14 has a two-layer structure consisting of an inner layer a and an outer layer b. This prevents the formation of voids between the filler material M and the lower sound insulation cover 14 when the filler material M filled into the through-holes H of the floor slab S shrinks due to drying. In addition, the inner layer a and outer layer b may contain expanded graphite. This further effectively prevents the formation of voids between the filler material M and the lower sound insulation cover 14.

[0104] Furthermore, irregularities may be formed on the outer surface of the outer layer b of the lower sound insulation cover 14. By forming irregularities on the outer surface of the outer layer b, the adhesion strength of the filler M to the outer surface of the outer layer b can be increased. This makes it possible to suppress the formation of gaps between the filler M and the lower sound insulation cover 14.

[0105] Furthermore, a fibrous mortar layer (not shown) covering the lower sound insulation cover 14 may be provided in the joint 10. By providing the fibrous mortar layer in the lower sound insulation cover 14, 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 10 increases the weight of the joint 10. Therefore, considering the ease of installation of the joint 10, it is preferable to make the thickness of the fibrous mortar layer 10 mm or less. In the first 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 14 corresponding to the through hole H.

[0106] 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 93 can be placed in the through hole H of the floor slab S. In this state, by setting the inclination angle θ3 of the tapered portion 93 to 80° or more and 85° or less, the tapered shape of the tapered portion 93 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 12 generated by the flames F2 on the floor below can be suppressed by the inclination of the inner surface of the filler material M.

[0107] Furthermore, the inclined portion 130 of the lower sound insulation cover 14 that covers the tapered portion 93 can be positioned in the through hole H. In this state, by setting the inclination angle θ6 of the inclined portion 130 to 70° or more and 89° or less, the tapered shape of the inclined portion 130 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 12 generated by flames on the floor below F2 can be suppressed by the inclination of the inner surface of the filler material M.

[0108] Furthermore, the thermal expansion coefficient of the fire-resistant material 12 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 12 is placed, for example, in the through-hole H in the floor slab S. Therefore, the thermal expansion of the fire-resistant material 12 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 12.

[0109] 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 12 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, the through-holes H can be properly sealed with the fire-resistant material 12 when the slab thickness T of the floor slab S is kept to less than 100 mm.

[0110] Here, for example, by installing the manifold joint 10 using a branch-floating construction method, the horizontal pipe connection section 21 is positioned so that it is floating above the floor slab S by a branch-down height H1. In addition, the fire-resistant material 12 has a height H2 of more than 150 mm (for example, 210 mm). Therefore, with the horizontal pipe connection section 21 floating above the branch-down height H1, for example, at least the lower half of the fire-resistant material 12 can be positioned in the through-hole H. This allows the fire-resistant material 12 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 12 can seal 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 12 can be demonstrated.

[0111] Furthermore, a fire-resistant sheet 110 was used as the fire-resistant material 12. Therefore, for example, the height H2 of the fire-resistant material 12 can be arbitrarily selected. This makes it possible to appropriately adjust the height H2 of the fire-resistant material 12 to the height required at the construction site.

[0112] Furthermore, it is preferable to make the height H2 of the fire-resistant material 12 higher than the intermediate pipe 32. By making the height H2 of the fire-resistant material 12 higher than the intermediate pipe 32, a larger fire-resistant material 12 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 12 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.

[0113] Furthermore, the lower end 13a of the upper sound insulation cover 13 and the upper end 14a of the lower sound insulation cover 14 are fixed to the outer surface of the receiving opening 61 in the intermediate pipe 32 with fixing tape 15, and the fixing tape 15 is positioned on the upper end 14a of the lower sound insulation cover 14. In addition, the upper end of the fixing tape 15 can be positioned at the highest point of the horizontal pipe junction 36. Therefore, for example, the fixing tape 15 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 10 is installed in a floating manner, the fixing tape 15 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 15 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 10 can be realized.

[0114] Here, a horizontal pipe connection section 21 is provided in the upper connecting pipe 30 of the vertical pipe connection section 20. The horizontal pipe connection section 21 is positioned above the floor slab S. Therefore, the upper sound insulation cover 13 that covers the upper connecting pipe 30 can be positioned above the floor slab S, for example, when the manifold joint is installed in a floating manner. Thus, it becomes possible to position the fixing tape 15 above the floor slab S. This prevents the fixing tape 15 from being damaged by flames from the floor below F2, for example, from the floor slab S.

[0115] Furthermore, the joint 10 is positioned in the through-hole H of the floor slab S. This allows the fixing tape 15 to be positioned on the upper end 14a of the lower sound insulation cover 14, thereby preventing damage to the fixing tape 15 from, for example, flames from the floor below F2 at the floor slab S.

[0116] Furthermore, the fixing tape 15 was positioned at a height of at least half the slab thickness T of the floor slab S. This prevents the fixing tape 15 from being damaged by, for example, flames from the floor below F2, at the floor slab S.

[0117] Furthermore, the fixing tape 15 was positioned above the upper surface of the floor slab S. This prevents the fixing tape 15 from being damaged by, for example, flames from the floor below (F2) at the floor slab S.

[0118] The lower end 52a of the vertical rib 52 is positioned within a first allowable height range of 25 mm or less from the lower end 26a of the opening 26 in the horizontal pipe connection section 21, which is its lowest point. Therefore, the vertical rib 52 does not obstruct the inflow of drainage from the opening 26 of the horizontal pipe connection section 21 to the vertical pipe connection section 20. This improves the drainage performance from the opening 26 of the horizontal pipe connection section 21 to the vertical pipe connection section 20.

[0119] Here, for example, a first swirling vane 48 is provided on the inner surface of the vertical pipe connection section 20. Therefore, it is conceivable that wastewater bounced off the first swirling vane 48 could jump into the horizontal pipe connection section 21 and cause backflow. To address this, the lower end 52a of the vertical rib 52 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 48 inside the vertical pipe connection section 20 from jumping into the horizontal pipe connection section 21 through the opening 26 and causing backflow.

[0120] Furthermore, the lower end 52a of the vertical rib 52 may be located within a second allowable height range, which is greater than or equal to the lower end 26a of the opening 26 and less than or equal to the axis O2 of the horizontal bush 25. Generally, the water level of the horizontal pipe P3 inserted into the horizontal bush 25 is less than or equal to the axis O2. Therefore, the vertical rib 52 can be prevented from obstructing the inflow of drainage from the opening 26 of the horizontal pipe connection 21 to the vertical pipe connection 20. This improves the drainage performance from the opening 26 of the horizontal pipe connection 21 to the vertical pipe connection 20. Furthermore, by positioning the lower end 52a of the vertical rib 52 within the second allowable range, it is possible to suppress, for example, the backflow of wastewater that bounces off the first swirling vane 48 inside the vertical pipe connection section 20 by entering the horizontal pipe connection section 21 through the opening 26.

[0121] Here, when the vertical pipe connection section 20 is injection molded, the first mold is opened upward from the lower ends 52a of the multiple vertical ribs 52, and the second mold is opened downward from the lower ends 52a of the multiple vertical ribs 52. As a result, a first draft angle is formed on the inner surface of the upper connecting pipe 30, extending upward from the lower ends 52a of the multiple vertical ribs 52, and a second draft angle is formed extending downward from the lower ends 52a of the multiple vertical ribs 52. Therefore, the inner diameter of the inner surface of the vertical pipe connection section 20 is minimized at the lower ends 52a of the multiple vertical ribs 52.

[0122] Furthermore, multiple fire-resistant sheets 112 and 114 were placed (attached) to the outer surfaces of the receiving opening 61 of the intermediate pipe 32, the straight pipe section 60 of the intermediate pipe 32, the receiving opening 91 of the lower connecting pipe 33, and the connecting pipe section 92 of the lower connecting pipe 33 as the fire-resistant material 12. This allows the outer surfaces to be covered with the fire-resistant material 12 formed from multiple fire-resistant sheets 112 and 114. By using multiple fire-resistant sheets 112 and 114 for the fire-resistant material 12, the width of the fire-resistant sheets 112 and 114 can be kept narrower compared to a single fire-resistant sheet. This makes it possible to suppress the occurrence of wrinkles in the fire-resistant material 12 that covers the outer surfaces of the receiving opening 61 of the intermediate pipe 32, the straight pipe section 60 of the intermediate pipe 32, the receiving opening 91 of the lower connecting pipe 33, and the connecting pipe section 92 of the lower connecting pipe 33.

[0123] Here, for example, if adjacent fire-resistant sheets 112 and 114 are placed with a gap between them, a recess is formed radially inward between the adjacent fire-resistant sheets 112 and 114. The outer surface of the fire-resistant material 12 is covered by the lower sound-insulating cover 14. As a result, in the recess between adjacent fire-resistant sheets 112 and 114, the lower sound-insulating cover 14 may be recessed radially inward, potentially reducing its sound-insulating performance.

[0124] Therefore, in the case of multiple fire-resistant sheets 112, 114, adjacent fire-resistant sheets 112, 114 were overlapped or butted together. As a result, the occurrence of irregularities on the outer surface of the fire-resistant material 12 due to the multiple fire-resistant sheets 112, 114 can be suppressed. This prevents the lower sound insulation cover 14 from being recessed radially inward, and ensures sound insulation performance.

[0125] Furthermore, multiple fire-resistant sheets 112 were arranged circumferentially on the outer surfaces of the receiving opening 61 of the intermediate pipe 32, the straight pipe section 60 of the intermediate pipe 32, the receiving opening 91 of the lower connecting pipe 33, and the connecting pipe section 92 of the lower connecting pipe 33. Here, the joint body 11 is rotatable around axis O1 when arranging the multiple fire-resistant sheets 112. This allows the multiple fire-resistant sheets 112 to be properly wrapped around the outer surfaces of the receiving opening 61 of the intermediate pipe 32, the straight pipe section 60 of the intermediate pipe 32, the receiving opening 91 of the lower connecting pipe 33, and the connecting pipe section 92 of the lower connecting pipe 33 by rotating the joint body 11.

[0126] Furthermore, as shown in Modification 1, multiple fire-resistant sheets 114 may be arranged in the direction of axis O1 on the outer surfaces of the receiving opening 61 of the intermediate pipe 32, the straight pipe section 60 of the intermediate pipe 32, the receiving opening 91 of the lower connecting pipe 33, and the connecting pipe section 92 of the lower connecting pipe 33. This allows, for example, when the joint body 11 is fixed, to appropriately arrange multiple fire-resistant sheets 114 on the outer surfaces of the receiving opening 61 of the intermediate pipe 32, the straight pipe section 60 of the intermediate pipe 32, the receiving opening 91 of the lower connecting pipe 33, and the connecting pipe section 92 of the lower connecting pipe 33.

[0127] Furthermore, in the construction method of the manifold joint 10, multiple fire-resistant sheets 112, 114 are placed on the outer surfaces of the receiving opening 61 of the intermediate pipe 32, the straight section 60 of the intermediate pipe 32, the receiving opening 91 of the lower connecting pipe 33, and the connecting section 92 of the lower connecting pipe 33. At this time, adjacent fire-resistant sheets 112, 114 are overlapped or butted together. In this way, multiple fire-resistant sheets 112, 114 are used to form a fire-resistant material 12 that covers the outer surfaces of the receiving opening 61 of the intermediate pipe 32, the straight section 60 of the intermediate pipe 32, the receiving opening 91 of the lower connecting pipe 33, and the connecting section 92 of the lower connecting pipe 33.

[0128] By using multiple fire-resistant sheets 112 and 114 instead of the fire-resistant material 12, the width of the fire-resistant sheet 110 can be made narrower compared to when the fire-resistant material 12 is made as a single fire-resistant sheet. This makes it possible to suppress the occurrence of wrinkles in the fire-resistant material 12 that covers the outer surface of the receiving opening 61 of the intermediate pipe 32, the straight pipe section 60 of the intermediate pipe 32, the receiving opening 91 of the lower connecting pipe 33, and the connecting pipe section 92 of the lower connecting pipe 33.

[0129] Furthermore, in the construction method of the manifold joint 10, by wrapping multiple fire-resistant sheets 112 around each other in the circumferential direction, the joints at both ends of one fire-resistant sheet 112 can be used as positioning sections (not shown). Therefore, the upper connecting pipe 30 and the lower connecting pipe 33 connected to the intermediate pipe 32 can be positioned in the circumferential direction based on the positioning sections. This allows the third swivel vane 100 of the lower connecting pipe 33 to be positioned in the circumferential direction relative to the first swivel vane 48 of the upper connecting pipe 30. Thus, the construction of connecting the upper connecting pipe 30, the intermediate pipe 32, and the lower connecting pipe 33 of the vertical pipe connection section 20 can be facilitated.

[0130] Furthermore, by overlapping or butting multiple fire-resistant sheets 114 in the circumferential direction in Modification 1, at least one of the joints of adjacent fire-resistant sheets 114 can be designated as a positioning section (not shown). Thus, the upper connecting pipe 30 and the lower connecting pipe 33 connected to the intermediate pipe 32 can be positioned in the circumferential direction based on the positioning section. This allows the third swivel vane 100 of the lower connecting pipe 33 to be positioned in the circumferential direction relative to the first swivel vane 48 of the upper connecting pipe 30. Consequently, the construction of connecting the upper connecting pipe 30, the intermediate pipe 32, and the lower connecting pipe 33 of the vertical pipe connection section 20 can be facilitated.

[0131] Furthermore, thickened sections 65 and 74 were provided in the straight pipe sections 60 and 73 of the intermediate pipes 32 and 72. In addition, the outer surfaces of the straight pipe sections 60 and 73 were made identical to the outer surfaces of the receiving openings 61 in the intermediate pipes 32 and 72, the receiving openings 91 in the lower connecting pipe 33, and the connecting pipe section 92 of the lower connecting pipe 33. Thus, the fire-resistant sheets 110, 112, and 114 forming the fire-resistant material 12 can be flatly attached to the outer surfaces of the intermediate pipes 32 and 72, the receiving openings 91 in the lower connecting pipe 33, and the connecting pipe section 92 of the lower connecting pipe 33 using the thickened sections 65 and 74. This prevents wrinkles from forming in the fire-resistant material 12 covering the outer surfaces of the intermediate pipes 32 and 72, the receiving openings 91 in the lower connecting pipe 33, and the connecting pipe section 92 of the lower connecting pipe 33.

[0132] Furthermore, the thickened portion 65 of the intermediate pipe 32 is made into a protruding portion 65 that extends radially outward from the side surface of the straight pipe portion 60. Therefore, the thickened portion of the straight pipe portion 60 can be reduced. This suppresses the occurrence of sink marks and other defects in the straight pipe portion 60 when the intermediate pipe 32 is injection molded, thereby improving the injection moldability of the intermediate pipe 32.

[0133] Furthermore, the protruding portion 65 is provided with at least one of a first rib 65a extending in the circumferential direction and a second rib 65b extending in the axial direction O1. Thus, ribs can be provided over the entire side surface of the straight pipe section 60. This effectively prevents wrinkles from forming in the fire-resistant material 12 covering the outer surface of the intermediate pipe 32, the outer surface of the receiving opening 91 in the lower connecting pipe 33, and the outer surface of the connecting pipe section 92 of the lower connecting pipe 33.

[0134] Furthermore, as in the intermediate pipe 72 according to Modification 1, the entire circumference of the straight pipe section 73 in the intermediate pipe 72 may be made to a constant thickness by the thickened section 74. Thus, the outer surface of the entire circumference of the straight pipe section 73 can be made to be the same outer surface as the outer surface of the receiving opening 61 in the intermediate pipe 72, the outer surface of the receiving opening 91 in the lower connecting pipe 33, and the outer surface of the connecting pipe section 92 of the lower connecting pipe 33. This makes it possible to appropriately suppress the occurrence of wrinkles in the fire-resistant material 12 that covers the outer surface of the intermediate pipe 72, the outer surface of the receiving opening 91 in the lower connecting pipe 33, and the outer surface of the connecting pipe section 92 of the lower connecting pipe 33.

[0135] Furthermore, as in the intermediate pipe 82 according to Modification 2, grooves 86 are provided on the inner surface of the straight pipe section 83 in the intermediate pipe 82. Therefore, the wall thickness of the straight pipe section 83 can be reduced at intervals in the circumferential direction. This suppresses the occurrence of sink marks and other defects in the straight pipe section 83 when the intermediate pipe 82 is injection molded, thereby improving the injection moldability of the intermediate pipe 82.

[0136] Next, the second to fourth embodiments will be described with reference to Figures 27 to 33. In the second to fourth embodiments, the same or similar components as those in the first embodiment's floor structure are denoted by the same reference numerals, and detailed explanations are omitted.

[0137] (Second Embodiment) As shown in Figure 27, the second embodiment replaces the blade unit 31 of the first embodiment with a blade unit 150. The blade unit 150 of the second embodiment is fitted to the upper end of the upper connecting pipe 30 in the vertical pipe connection section 20, similar to the blade unit 31 of the first embodiment. The blade unit 150 has a unit body 151, a sealing member 41, and a retaining member 42. The unit body 151 has an upper vertical pipe connection section 45, a blade support section 152, a first swivel blade 153, and a plurality of reinforcing ribs 154. The blade support section 152, the first swivel blade 153, and the plurality of reinforcing ribs 154 are arranged inside the upper connecting pipe 30 in the vertical pipe connection section 20. The upper vertical pipe connection section 45, the blade support section 152, the first swivel blade 153, and the multiple reinforcing ribs 154 of the unit body 151 are integrally constructed from polyvinyl chloride resin or the like.

[0138] As shown in Figures 27 to 31, the upper vertical pipe connection portion 45 has a protrusion 45a. The protrusion 45a projects radially outward from the outer surface of the upper vertical pipe connection portion 45. By engaging the protrusion 45a with the recess 37 of the upper connecting pipe 30, the unit body 40 (specifically the first swivel vane 48) can be positioned circumferentially with respect to the upper connecting pipe 30. The blade support portion 152 extends downward from a part of the circumferential direction at the lower end of the upper vertical pipe connection portion 45. The blade support portion 152 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 152 extends in the vertical direction. That is, the circumferential length of the blade support portion 152 is substantially constant regardless of its position in the vertical direction.

[0139] The first swivel blade 153 is provided on the inner surface (the surface facing radially inward) of the blade support portion 152. The upper surface 153a of the first swivel blade 153 protrudes radially inward from the blade support portion 152 with an inclination angle θ7 of 90°. The upper surface 153a of the first swivel blade 153 is inclined with an inclination angle θ8 of 55° so that it gradually moves downward toward the first side X1 in the circumferential direction. The inclination angle θ8 is the angle of inclination from one side portion 152a to the other side portion 152b of the blade support portion 152 with respect to a plane perpendicular to the axis O1.

[0140] As shown in Figure 27, the first swirling blade 153 is brought into contact with the drainage in the upper connecting pipe 30 at the vertical pipe connection section 20, making it easier for the drainage to be locally stagnated near the first swirling blade 153. Therefore, the effect of improving the drainage capacity in the upper connecting pipe 30 is significantly achieved.

[0141] As shown in Figures 28 and 29, a plurality of reinforcing ribs 154 are provided on the lower surface 153b of the first swivel blade 153. The plurality of reinforcing ribs 154 extend from the blade support portion 152 to the outer edge 153c of the first swivel blade 153 on the lower surface 153b of the first swivel blade 153. The plurality of reinforcing ribs 154 can dampen vibrations of the blade support portion 152 and the first swivel blade 153. The plurality of reinforcing ribs 154 constitute a vibration suppression portion 156. That is, the vibration suppression portion 156 has a vibration suppression function for the blade support portion 152 and the first swivel blade 153.

[0142] (Third embodiment) As shown in Figure 32, the third embodiment incorporates thermally expandable graphite into a portion of the vertical pipe connection 20, thereby configuring a portion of the vertical pipe connection 20 as a fire-resistant pipe 160. Specifically, the third embodiment replaces, for example, the fire-resistant material 12 and intermediate pipe 32 of the first embodiment with a fire-resistant pipe 160. In the third embodiment, an intermediate pipe is used as an example to describe a portion of the vertical pipe connection 20, but the portion of the vertical pipe connection 20 is not limited to an intermediate pipe.

[0143] The fire-resistant pipe 160 also serves as an intermediate pipe connected between the upper connecting pipe 30 and the lower connecting pipe 33 in the axial direction O1. That is, the intermediate pipe constitutes the fire-resistant pipe 160. The fire-resistant pipe 160 has the same shape as, for example, the intermediate pipe 32 of the first embodiment. That is, the fire-resistant pipe 160 is manufactured, for example, by injection molding of a resin composition. The fire-resistant pipe 160 has, for example, a straight pipe section 161, a receiving opening 162, and a spigot opening 163. The height of the fire-resistant pipe 160 is preferably more than 150 mm and 300 mm or less.

[0144] The fire-resistant pipe 160 contains thermally expandable graphite. Furthermore, the fire-resistant pipe 160 employs a single-layer structure consisting of a resin composition containing thermally expandable graphite in a ratio of 1 to 20 parts by weight per 100 parts by weight of polyvinyl chloride resin. Alternatively, a three-layer structure may be adopted, consisting of a thermally expandable fire-resistant layer made of a resin composition containing thermally expandable graphite in a ratio of 1 to 20 parts by weight 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.

[0145] In the third embodiment of the fire-resistant pipe 160 described above, the intermediate pipe constituting a part of the vertical pipe connection section 20 is made into a fire-resistant pipe 160. In other words, the intermediate pipe is used in conjunction with the fire-resistant pipe 160. Furthermore, the height of the fire-resistant pipe 160 is ensured to be more than 150 mm. Therefore, in the branch-floating construction state in which the horizontal pipe connection section 21 is raised from the floor slab S, a large fire-resistant pipe 160 can be secured in the through-hole H. This allows the fire-resistant pipe 160 to expand if a fire occurs on floor F2 below the floor slab S, and the area around the floor slab S and the penetration hole H is heated by the flames and smoke. Consequently, the expanded fire-resistant pipe 160 can seal the penetration hole H. As a result, the flames and smoke from floor F2 below can be prevented from spreading to floor F1 above, and the fire-resistant performance of the fire-resistant pipe 160 can be realized.

[0146] Furthermore, by using the intermediate pipes that make up part of the vertical pipe connection section 20 as fire-resistant pipes 160, it is not necessary to attach fire-resistant material to the outer surface of the joint body 11. This makes it possible to keep the outer diameter of the manifold joint 10 small.

[0147] Furthermore, the intermediate pipe constituting the fire-resistant pipe 160 has the same shape as, for example, the intermediate pipe 32 in the first embodiment. Therefore, the fire-resistant pipe 160 is positioned to avoid the first swivel vane 48, the multiple longitudinal ribs 52, and the third swivel vane 100. This prevents the first swivel vane 48, the longitudinal ribs 52, and the third swivel vane 100 from hindering the thermal expansion of the fire-resistant pipe 160.

[0148] (Fourth Embodiment) As shown in Figure 33, the fourth embodiment connects the upper connecting pipe 30 at the vertical pipe connection section 20 by fitting the receiving end 91 of the lower connecting pipe 33 into the lower connecting section (horizontal pipe junction) 36, and the lower connecting pipe 33 is provided with fire-resistant material 180. In this embodiment, there is no intermediate pipe. The fire-resistant material 180 is the same as the fire-resistant material 12 in the first embodiment. The fire-resistant material 180 is, for example, placed and attached to the outer surface of the connecting pipe section 92 of the lower connecting pipe 33. The height of the fire-resistant material 180 is preferably more than 150 mm.

[0149] In the fourth embodiment, an example is described in which the fire-resistant material 180 is placed on the outer surface of the connecting pipe portion 92 of the lower connecting pipe 33, but the embodiment is not limited to this. As another example, the fire-resistant material 180 may be placed continuously on both the lower connecting portion 36 of the upper connecting pipe 30 and the lower connecting pipe 33.

[0150] 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.

[0151] In the above embodiment, an example was described in which the height H2 of the fire-resistant material 12 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 12 higher than the height of the intermediate pipe 32, but the embodiment is not limited to this. In the above embodiment, an example was described in which the fixing tape 15 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 15 is placed above the upper surface of the floor slab S, but the embodiment is not limited to this. In the above embodiment, an example was described in which the lower ends 52a of the multiple vertical ribs 52 are positioned within a first allowable height range of at least the lower end 26a of the opening 26 in the horizontal pipe connection portion 21 and 25 mm or less from the lower end 26a of the opening 26, but the embodiment is not limited to this. In the above embodiment, an example was described in which the lower end 52a of the vertical rib 52 is positioned within a second allowable height range that is greater than or equal to the lower end 26a of the opening 26 in the horizontal pipe connection portion 21 and less than or equal to the axis O2 of the horizontal bush 25, but the embodiment is not limited to this. In the above embodiment, an example was described in which the lower ends 52a of a plurality of longitudinal ribs 52 are arranged at the same height in the direction of axis O1, but the embodiment is not limited to this. In the above embodiment, an example was described in which thickened sections 65 and 74 are provided in the straight pipe sections 60 and 73 of the intermediate pipes 32 and 72, so that the outer surface of the straight pipe sections 60 and 73 is the same as the outer surface of the receiving opening 61 of the intermediate pipe 32 and the receiving opening 91 of the lower connecting pipe 33, but the embodiment is not limited to this. It is also not necessary to provide thickened sections 65 and 74 in the straight pipe sections 60 and 73 of the intermediate pipes 32 and 72. In the above embodiment, the thickened portion (protruding portion) 65 of the straight pipe portion 60 was described as a first rib 65a extending in the circumferential direction and a second rib 65b extending in the axial direction, but the direction in which the first rib 65a and the second rib 65b extend can be arbitrarily selected.

[0152] 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.

[0153] (Note) The above embodiment can be understood, for example, as follows:

[0154] <1> A manifold joint according to one aspect of the present invention is a manifold joint comprising a vertical pipe connection portion and a fire-resistant material, wherein the fire-resistant material has a plurality of fire-resistant sheets arranged on the outer surface of the vertical pipe connection portion, and the plurality of fire-resistant sheets are overlapped or butted together.

[0155] In this manifold joint, multiple fire-resistant sheets are used as the fire-resistant material, and these multiple fire-resistant sheets are arranged on the outer surface of the vertical pipe connection. This allows the outer surface to be covered with a fire-resistant material formed from multiple fire-resistant sheets. By using multiple fire-resistant sheets as the fire-resistant material, the width of the fire-resistant sheet can be narrowed compared to using a single fire-resistant sheet. This reduces the occurrence of wrinkles in the fire-resistant material covering the outer surface of the vertical pipe connection.

[0156] In this case, when adjacent fire-resistant sheets are placed with a gap between them, a radially inward recess is formed between the adjacent fire-resistant sheets. The fire-resistant material is covered with a sound-insulating cover (e.g., sound-absorbing material and sound-insulating material). As a result, in the recess between the fire-resistant sheets, the sound-insulating cover may be recessed radially inward, potentially reducing its sound-insulating performance. Therefore, in the case of multiple fire-resistant sheets, adjacent fire-resistant sheets were overlapped or butted together. This suppresses the occurrence of irregularities on the outer surface of the fire-resistant material. As a result, the sound insulation cover is prevented from being recessed radially inward, and the sound insulation performance of the sound insulation cover is ensured.

[0157] <2> the above <1> In the manifold joint relating to the above, the plurality of fire-resistant sheets may be arranged circumferentially on the outer surface of the vertical pipe connection and may be overlapped or butted together in the axial direction of the vertical pipe connection.

[0158] In the manifold joint, multiple fire-resistant sheets are arranged circumferentially on the outer surface of the vertical pipe connection. This allows the multiple fire-resistant sheets to be properly wrapped around the outer surface of the vertical pipe connection by, for example, rotating the vertical pipe connection around its axis.

[0159] <3> the above <1> In the manifold joint relating to the above, the plurality of fire-resistant sheets may be arranged axially on the outer surface of the vertical pipe connection and may be overlapped or butted together in the circumferential direction of the vertical pipe connection.

[0160] In this manifold joint, multiple fire-resistant sheets are arranged axially on the outer surface of the vertical pipe connection. This allows for the appropriate placement of multiple fire-resistant sheets on the outer surface of the vertical pipe connection, for example, when the vertical pipe connection is fixed in place.

[0161] <4> A method for constructing a manifold joint according to one aspect of the present invention is a method for constructing a manifold joint comprising a vertical pipe connection portion and a fire-resistant material covering the vertical pipe connection portion, wherein a plurality of fire-resistant sheets are placed on the outer surface of the vertical pipe connection portion, and the fire-resistant material covering the outer surface is formed by overlapping or butting adjacent fire-resistant sheets.

[0162] According to the construction method for the manifold joint, multiple fire-resistant sheets are placed on the outer surface of the vertical pipe connection. In this process, adjacent fire-resistant sheets are overlapped or butted together. This forms a fire-resistant material that covers the outer surface of the vertical pipe connection with multiple fire-resistant sheets. By using multiple fire-resistant sheets as the fire-resistant material, the width of the fire-resistant sheet can be narrowed compared to using a single fire-resistant sheet. This reduces the occurrence of wrinkles in the fire-resistant material that covers the outer surface of the vertical pipe connection.

[0163] <5> the above <4> In the construction method of the manifold joint relating to the above, the vertical pipe connection portion comprises an upper connecting pipe, an intermediate pipe connected to the lower end of the upper connecting pipe, and a lower connecting pipe connected to the lower end of the intermediate pipe. At least one of the joints at both ends of one fire-resistant sheet and the joints of adjacent fire-resistant sheets may be used as a positioning portion, and the upper connecting pipe and the lower connecting pipe connected to the intermediate pipe may be positioned based on the positioning portion.

[0164] According to the construction method for the manifold joint, for example, by wrapping multiple fire-resistant sheets around each other in the circumferential direction, the joints at both ends of one fire-resistant sheet can be used as positioning points. Therefore, the upper and lower connecting pipes that connect to the intermediate pipe can be positioned in the circumferential direction based on the positioning points. As a result, if, for example, the upper connecting pipe has a first swivel vane, the intermediate pipe has a second swivel vane, and the lower connecting pipe has a third swivel vane, these swivel vanes can be positioned in the circumferential direction based on the positioning points. Therefore, the construction of connecting the upper connecting pipe, intermediate pipe, and lower connecting pipe of the vertical pipe connection can be made easier.

[0165] Furthermore, by overlapping or butting multiple fire-resistant sheets in the circumferential direction, at least one of the joints of adjacent fire-resistant sheets can be designated as a positioning section. Therefore, the upper and lower connecting pipes connected to the intermediate pipe can be positioned in the circumferential direction based on the positioning section. This allows, for example, if the upper connecting pipe has a first swivel vane, the intermediate pipe has a second swivel vane, and the lower connecting pipe has a third swivel vane, these swivel vanes to be positioned in the circumferential direction based on the positioning section. Consequently, the construction of connecting the upper, intermediate, and lower connecting pipes of the vertical pipe connection section can be facilitated. [Explanation of Symbols]

[0166] 10… Manifold joint 12...Fireproof material 20…Vertical pipe connection 21… Horizontal pipe connection 30…Upper connecting pipe 32…Intermediate tube 33... Lower connecting pipe 36...Lower connection point (horizontal pipe junction 36, lower end of upper connecting pipe) 62...Socket (second connection port, lower end of intermediate pipe) 112,114… Fire-resistant sheet O1... Axis (axis of the vertical pipe connection)

Claims

1. A manifold joint equipped with a vertical pipe connection and fire-resistant material, The aforementioned fire-resistant material is The vertical pipe connection section has a plurality of fire-resistant sheets arranged on its outer surface, The aforementioned multiple fire-resistant sheets are Adjacent fire-resistant sheets are overlapped or butted together. Manifold joint.

2. The aforementioned multiple fire-resistant sheets are Arranged circumferentially on the outer surface of the vertical pipe connection, and overlapping or butting against each other in the axial direction of the vertical pipe connection, The manifold joint according to claim 1.

3. The aforementioned multiple fire-resistant sheets are Arranged axially on the outer surface of the vertical pipe connection, and overlapping or butting against each other in the circumferential direction of the vertical pipe connection, The manifold joint according to claim 1.

4. A method for constructing a manifold joint comprising a vertical pipe connection and a fire-resistant material covering the vertical pipe connection, Multiple fire-resistant sheets are placed on the outer surface of the vertical pipe connection portion, and adjacent fire-resistant sheets are overlapped or butted together to form the fire-resistant material that covers the outer surface. Installation method for manifold joints.

5. The vertical pipe connection section comprises an upper connecting pipe, an intermediate pipe connected to the lower end of the upper connecting pipe, and a lower connecting pipe connected to the lower end of the intermediate pipe. At least one of the joints at both ends of one fire-resistant sheet and the joints of adjacent fire-resistant sheets is designated as a positioning section, and the upper connecting pipe and the lower connecting pipe connected to the intermediate pipe are positioned based on the positioning section. A method for constructing the manifold joint according to claim 4.

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