Drainage manifold

Abstract

To provide a drainage collecting pipe made of resin that can reduce noise or vibration caused along with occurrence of swirling flow.SOLUTION: An upper pipe 1100 of a drainage collecting pipe 1000 has a protrusion configured to protrude on an inner periphery in order to change flow of drainage in a direction along which a horizontal branch pipe connection part 1120 is not provided. The protrusion is a drift plate 1200 having a planar surface. The upper pipe 1100 of the drainage collecting pipe 1000 has a recess for forming the protrusion (drift plate 1200) on an outer peripheral surface of the upper pipe 1100 having the protrusion (drift plate 1200). The recess has a rib 1400 including a face perpendicular to a shaft core of the drainage collecting pipe 1000. The rib 1400 has a function to reduce vibration or noise generated when the drainage is discharged on the protrusion (drift plate 1200).SELECTED DRAWING: Figure 3

Description

Technical Field

[0001] The present invention relates to a resin drain collecting pipe provided through a floor slab of a building, including an upper pipe provided with an upper riser connection part that protrudes above the floor slab and connects to an upper riser for draining water flowing in from an upper floor, and at least one lateral branch pipe connection part for connecting a lateral branch pipe above the floor slab, and a lower pipe connected below the upper pipe. In particular, it can reduce noise or vibration associated with the generation of swirling flow, can reduce the number of assembly steps, can achieve quality stabilization, and can prevent the breaking of the water seal of sanitary appliances on each floor due to pressure fluctuations by providing a ventilation core in the riser as a swirling flow along the inner wall surface of the riser for the drainage flowing down from the upper floor to reduce pressure fluctuations caused by blockage in the riser.

Background Art

[0002] Water supply facilities and drainage facilities are provided in apartment buildings, office buildings, etc. Among these, the drainage facilities typically include a vertical pipe (riser pipe, upper riser pipe, lower riser pipe) that penetrates vertically through each floor of the building, a horizontal pipe (lateral branch pipe, branch pipe) installed within each floor, and a drainage pipe joint (also referred to as a drain collecting pipe, drain pipe joint, or drain collecting joint) that connects these.

[0003] And such a drainage pipe joint includes a pipe body (main body part, upper pipe) arranged in a through-hole of the floor slab when constructed in a building. The main body part has an upper riser connection part at the upper end that can be connected to the upper riser on the upstream side, a lateral branch pipe connection part at the side that can be connected to the lateral branch pipe, and a lower pipe connection part at the lower end that can be connected to a downstream piping member. Also, such a drainage pipe joint formed of one or more resin injection molded products is widely known.

[0004] In a drainage manifold joint connecting a vertical drainage pipe and horizontal branch pipes, a technique is disclosed in Japanese Patent Application Publication No. 2011-236676 (Patent Document 1) that uses swirling vanes to receive the drainage flowing down from the upper floors, creating a swirling flow along the inner wall surface of the vertical pipe, thereby always providing a ventilation core within the vertical pipe, reducing pressure fluctuations due to blockage within the vertical pipe, and preventing the water seals of sanitary equipment on each floor from breaking due to pressure fluctuations.

[0005] The drain pipe fitting disclosed in Patent Document 1 comprises a main body portion having an inner diameter larger than the vertical pipes to which it is connected vertically, at least one horizontal branch pipe connection portion provided so as to protrude from the wall surface of the main body portion, and a tapered cylindrical portion provided below the main body portion and gradually decreasing in diameter toward the lower end, wherein the drain pipe fitting comprises a first swirling vane provided inside the main body portion, a second swirling vane provided below the lower end of the first swirling vane, and a third swirling vane provided below the lower end of the second swirling vane and within the tapered cylindrical portion, wherein the first to third swirling vanes are arranged such that the drainage received by the first swirling vane is received by the second swirling vane and not received by the third swirling vane, resulting in a swirling flow. As shown in Figure 5 of Patent Document 1, in this drain pipe joint, the main body and tapered cylindrical portion, and the first and second swivel vanes are made of separate components. [Prior art documents] [Patent Documents]

[0006] [Patent Document 1] Japanese Patent Publication No. 2011-236676 [Overview of the Initiative] [Problems that the invention aims to solve]

[0007] Incidentally, when wastewater hits a projection (a first swirling vane, a second swirling vane, and a third swirling vane in Patent Document 1, and a projection or flow deflection plate in the present invention) that protrudes from the inner circumference to generate a swirling flow, including the drain pipe joint disclosed in Patent Document 1, the flow changes and noise or vibration is generated. However, the drain pipe joint disclosed in Patent Document 1 neither discloses nor suggests any effective solution to reduce such noise or vibration.

[0008] Furthermore, while a drainage manifold is assembled from multiple integrally molded resin components, and then various outer layer materials are attached to complete such a manifold, the number of parts can increase, or the assembly positions can become complex, potentially increasing the assembly time for the drainage manifold. However, the drainage pipe joint disclosed in Patent Document 1 neither discloses nor suggests that the assembly time will increase, nor does it disclose or suggest any effective solution to this problem.

[0009] The present invention was developed in view of the above-mentioned problems, and its objective is to provide a drainage manifold that can reduce noise or vibration associated with the generation of swirling flow, reduce assembly man-hours, stabilize quality, and prevent the water seals of sanitary equipment on each floor from breaking due to pressure fluctuations by providing a ventilation core inside the riser to allow drainage flowing down from the upper floors to flow along the inner wall surface of the riser as a swirling flow. [Means for solving the problem]

[0010] To achieve the above objective, the resin joint according to the present invention employs the following technical means.

[0011] The drainage manifold according to the present invention is a resin drainage manifold arranged in a through-hole in the floor slab of a building, wherein the drainage manifold includes an upper pipe protruding above the floor slab and a lower pipe connected below the upper pipe, the upper pipe includes an upper pipe connection for connecting an upper pipe that allows drainage from an upper floor to flow in and at least one lateral branch pipe connection for connecting a lateral branch pipe above the floor slab, the lower pipe includes a lower pipe connection for connecting a lower pipe that allows drainage to flow out to a lower floor, the upper pipe is provided with a projection protruding inward to change the flow of drainage in the direction not provided with the lateral branch pipe connection, and the upper pipe is provided with a recess on the outer surface of the upper pipe where the projection is provided for forming the projection.

[0012] Preferably, the vertical axis of the upper pipe and the vertical axis of the lower pipe coincide to form the axis of the drainage manifold, and the recess can be configured to include a rib with a surface perpendicular to the axis.

[0013] More preferably, the recess can be configured to have the function of reducing vibration or noise generated when drainage water hits the protrusion.

[0014] More preferably, the device can be configured to have a function of reducing vibration or noise by utilizing the air that accumulates in the recess.

[0015] More preferably, the member covering the drainage manifold, including the recess, or the member fitted into the recess, can be configured to have a function of reducing vibration or noise.

[0016] More preferably, the ribs are provided in multiple locations between the upper and lower surfaces of the lateral branch pipe connection, and the outer diameter of the lowest rib can be configured to be different from the outer diameter of the other normal ribs.

[0017] More preferably, the outer diameter of the normal rib can be configured to be approximately the same as the outer diameter of the body portion of the upper pipe below the lateral branch pipe connection portion.

[0018] More preferably, the outer diameter of the lowermost rib can be configured to be larger than the outer diameter of the body portion below the lateral branch pipe connection portion in the upper pipe.

[0019] More preferably, an outer layer member is provided on the drainage collecting pipe via a rubber ring provided on the body portion, the height position of the lower surface of the lowermost rib is substantially the same as the lower surface of the lateral branch pipe connection portion, and the outer diameter of the lowermost rib can be configured to protrude to the outer peripheral side exceeding the thickness of the rubber ring from the outer diameter of the body portion.

Advantages of the Invention

[0020] According to the present invention, it is possible to reduce noise or vibration associated with the generation of a swirling flow, reduce the number of assembly steps, achieve quality stabilization, and provide a drainage collecting pipe that can reduce pressure fluctuations due to blockage in the vertical pipe by providing a ventilation core in the vertical pipe as a swirling flow along the inner wall surface of the vertical pipe for the drainage flowing down from the upper floors, and prevent the breakage of the water seal of sanitary appliances on each floor due to pressure fluctuations.

Brief Description of the Drawings

[0021] [Figure 1] It is a top view of a drainage collecting pipe 1000 according to an embodiment of the present invention. [Figure 2] It is a cross-sectional view taken along line 2-2 in FIG. 1. [Figure 3] It is a cross-sectional view taken along line 3-3 in FIG. 1. [Figure 4] It is an enlarged view of region 4 in FIG. 2. [Figure 5] It is a diagram for explaining the height position of the flow deflection plate 1200, the lower end position of the third backflow prevention rib 1330, and the height direction position of the thermally expandable refractory 1712. [Figure 6] It is a diagram for explaining the positional relationship between the flow deflection plate 1200 and the swirling blade 1600 (closest: θ = 102 deg). [Figure 7]It is a diagram for explaining the positional relationship between the deflection plate 1200 and the swivel blade 1600 (maximum separation: θ = 168 deg). [Figure 8] It is a diagram for explaining the positional relationship between the deflection plate 1200 and the swivel blade 1600 (θ = 132 deg). [Figure 9] It is a diagram (part 1) for explaining the ribs 1400 (barrel diameter equal ribs 1410, rubber ring positioning ribs 1412) provided on the outer peripheral side of the deflection plate 1200 in the upper pipe 1100 of the drain collecting pipe 1000. [Figure 10] It is a diagram (part 2) for explaining the ribs 1400 (barrel diameter equal ribs 1410, rubber ring positioning ribs 1412) provided on the outer peripheral side of the deflection plate 1200 in the upper pipe 1100 of the drain collecting pipe 1000. [Figure 11] It is a diagram (part 1) for explaining the drain slope in the upper pipe 1100 of the drain collecting pipe 1000. [Figure 12] It is a diagram (part 2) for explaining the drain slope in the upper pipe 1100 of the drain collecting pipe 1000. [Figure 13] It is a diagram (part 3) for explaining the drain slope in the upper pipe 1100 of the drain collecting pipe 1000. [Figure 14] It is a diagram (part 4) for explaining the drain slope in the upper pipe 1100 of the drain collecting pipe 1000. [Figure 15] It is a diagram for explaining the deflection plate reinforcing ribs in the upper pipe 1100 of the drain collecting pipe 1000. [Figure 16] It is a diagram for explaining the first modification example in the embodiment of the present invention. [Figure 17] It is a diagram for explaining the second modification example in the embodiment of the present invention. [Figure 18] It is a diagram for explaining the third modification example in the embodiment of the present invention.

Embodiments for Carrying Out the Invention

[0022] In the following, a drainage manifold pipe 1000 according to an embodiment of the present invention will be described in detail with reference to Figures 1 to 15. In the following description, the terms "outer surface," "outer surface," and "outer side," "outer layer side," "outer periphery side," and "outer side," "inner layer side," "inner periphery side," and "inner side," and "thermal-expandable fire-resistant material," "fire-resistant material," and "thermal-expandable material" may not be clearly distinguished. Also, in the cross-sectional view, different members may not be clearly distinguished by the type of hatching. Furthermore, in order to facilitate understanding of the present invention, the direction of the lateral branch pipes may be specified in the top or bottom view using the hour hand of a clock, such as 0 o'clock, 3 o'clock, 6 o'clock, and 9 o'clock. In addition, the symbols (consisting of a number + (if necessary) an alphabet) attached to the dashed line along with the arrow in the figures indicate the figure number with the number and the sub-number (A, B, C, etc.) in that figure, and the figures specified by these symbols show cross-sectional views. Furthermore, the symbols attached to the dotted lines in the figures (consisting of a number + (if necessary) an alphabet) indicate the figure number with the number and the sub-number (A, B, C, etc.) within that figure, and enlarged views are shown for the figures specified by these symbols (except for dotted lines with symbols that include the alphabet S, which indicates space). Note that the drainage manifold pipes according to this embodiment described below are not limited to those for super high floors, the lowest floors, or intermediate floors unless otherwise specified.

[0023] The general structure of the drainage manifold 1000 will be described with reference to Figure 1, which shows a top view of the drainage manifold 1000 according to this embodiment; Figure 2, which shows a cross-sectional view of 2-2 in Figure 1; Figure 3, which shows a cross-sectional view of 3-3 in Figure 1; and Figure 4, which is an enlarged view of region 4 in Figure 2.

[0024] The drainage manifold 1000 shown in these figures is a resin drainage manifold placed in a penetration hole in the floor slab of a building. This drainage manifold 1000 includes an upper pipe 1100 that protrudes above the floor slab and a lower pipe 1500 connected below the upper pipe 1100. At the height of the floor slab, the lower pipe 1500 is connected (adhesively bonded) to the lower end of the upper pipe 1100 by being fitted onto it. The positional relationship between the drainage manifold 1000 and the floor slab in the height direction is preferably such that the upper end of the heat-expandable fire-resistant material 1712, which will be described in more detail later, is below the upper surface of the floor slab, and the lower end of the heat-expandable fire-resistant material 1712 is above the lower surface of the floor slab, although it is also acceptable for the lower end of the heat-expandable fire-resistant material 1712 to be below the lower surface of the floor slab. Here, the vertical axis of the upper pipe 1100 and the vertical axis of the lower pipe 1500 coincide to form the axis of the drainage manifold 1000. The upper pipe 1100 includes an upper riser connection section 1110 for connecting an upper riser pipe that allows drainage from the upper floor to flow in, and at least one horizontal branch pipe connection section 1120 for connecting a horizontal branch pipe above the floor slab. The lower pipe 1500 includes a lower riser connection section 1510 for connecting a lower riser pipe that allows drainage to flow out to the lower floor. For example, the upper riser connection section 1110 is provided with a riser socket 1112 and a rubber ring 1114, through which the upper riser pipe and the drain manifold pipe 1000 are connected, and the horizontal branch pipe connection section 1120 is provided with a horizontal branch pipe socket 1122 and a rubber ring 1124, through which the horizontal branch pipe and the drain manifold pipe 1000 are connected.

[0025] In the drainage manifold 1000 according to this embodiment, as shown in Figure 1, the drainage manifold 1000 is provided with lateral branch pipe connection parts 1120 at the 0 o'clock, 3 o'clock, and 6 o'clock directions in the top view, but not at the 9 o'clock direction. However, it is sufficient to provide at least one lateral branch pipe connection part 1120. Alternatively, as in this drainage manifold 1000, lateral branch pipe connection parts 1120 may be provided at three locations other than 9 o'clock, and the lateral branch pipe connection parts 1120 in the direction to which the lateral branch pipe is not connected may be sealed with a plug (this plug is sealed via a lateral branch pipe socket 1122 and a rubber ring 1124).

[0026] A first backflow prevention rib 1310 is provided between the 12 o'clock direction lateral branch pipe connection 1120 and the 3 o'clock direction lateral branch pipe connection 1120 to prevent wastewater flowing from a lateral branch pipe into the drainage manifold 1000 from flowing back into the adjacent lateral branch pipe, and a second backflow prevention rib 1320 is provided between the 3 o'clock direction lateral branch pipe connection 1120 and the 6 o'clock direction lateral branch pipe connection 1120. These first backflow prevention ribs 1310 and the second backflow prevention ribs 1320 are provided so as to be located on the inner circumference (inner wall) of the upper pipe 1100 of the drainage manifold 1000 and to have a shape parallel to the axis.

[0027] The upper pipe 1100 of this drain manifold 1000 is provided with a first projection that protrudes inward in order to alter the flow of drainage in the direction that does not have a lateral branch pipe connection 1120 (in this case, the 9 o'clock direction). For example, this first projection is a flow deflection plate 1200 with a planar surface 1200P. Furthermore, the lower pipe 1500 of this drain manifold 1000 is provided with a second projection that protrudes inward in order to alter the flow of drainage. For example, this second projection is a swirling vane 1600 with a curved surface. Furthermore, the drainage manifold 1000 according to this embodiment is equipped with such a flow deflection plate 1200 (first projection) and a swivel vane 1600 (second projection), and the height position of the first projection (flow deflection plate 1200, which may be simply referred to as flow deflection plate or flow deflection plate 1200 hereafter) is such that the starting point, upper end 1200U, is below the pipe axis of the lateral branch pipe connection 1120, and the ending point, lower end 1200D, is above the upper end 1600U of the second projection (swivel vane 1600, which may be simply referred to as swivel vane or swivel vane 1600 hereafter). Thus, by positioning the upper end 1200U, which is the starting point of the flow deflection plate 1200, below the pipe axis of the lateral branch pipe connection 1120, it is possible to prevent the wastewater to which the swirling component has been added by the flow deflection plate 1200 from flowing back into the lateral branch pipe. Furthermore, by positioning the lower end 1200D, which is the ending point of the flow deflection plate 1200, above the upper end 1600U of the swirling vane 1600, the swirling flow induced by the flow deflection plate 1200 is taken over by the swirling vane 1600, as shown by the white arrows in Figure 2, and the swirling vane 1600 exerts the effect of further increasing the swirling component in the swirling flow.

[0028] Furthermore, as shown in Figures 2 and 5(A), the height of the lower end 1200D, which is the endpoint of the first projection (flow deflection plate 1200), is below the bottom of the lateral branch pipe connection section 1120. This height of the lower end 1200D of the flow deflection plate 1200 below the bottom of the lateral branch pipe connection section 1120 is preferable because it prevents backflow from the flow deflection plate 1200 into the lateral branch pipe and facilitates the formation of a swirling flow. In addition, the upper pipe 1100 of the drainage manifold pipe 1000 is equipped with an endpoint-side backflow prevention rib (third backflow prevention rib 1330) on the endpoint side (lower end 1200D side) of the first projection (flow deflection plate 1200), which has a shape parallel to the axis, in order to prevent splashed drainage from the first projection from flowing back into the lateral branch pipe. As shown in Figures 2 and 5(A), the height of the lower end 1330D of the terminal-side backflow prevention rib (third backflow prevention rib 1330) is below the bottom of the lateral branch pipe connection 1120 and above the lower end 1200D of the first projection. This arrangement is preferable because the lower end 1330D of the terminal-side backflow prevention rib (third backflow prevention rib 1330) is below the bottom of the lateral branch pipe connection 1120, preventing backflow from the deflection plate 1200 to the lateral branch pipe, and the lower end 1330D of the terminal-side backflow prevention rib (third backflow prevention rib 1330) is above the lower end 1200D of the first projection, creating a space 1330S, which facilitates the formation of a swirling flow. The presence of this space 1330S allows the swirling flow induced by the first projection (flow deflection plate 1200) to flow down without being obstructed by the terminal side backflow prevention rib (third backflow prevention rib 1330), as shown by the white arrow in Figure 2, and is taken over by the second projection (swirling vane 1600), where the swirling vane 1600 further increases the swirling component of the swirling flow.

[0029] As shown in Figure 4, the horizontal branch pipe connection section 1120 is formed in the following order from the lower end to the higher end in the height direction: the bottom of the horizontal branch pipe connection section 1120, the bottom of the horizontal branch pipe socket 1122, the outer diameter of the horizontal branch pipe (bottom of the outer diameter), and the inner diameter of the horizontal branch pipe (bottom of the inner diameter, bottom of the horizontal branch pipe). As described above, the height position of the lower end 1200D, which is the endpoint of this first projection (flow deflection plate 1200), and the height position of the lower end 1330D of the endpoint side backflow prevention rib (third backflow prevention rib 1330) are defined with respect to the bottom of the horizontal branch pipe connection section 1120. This is because the (minimum) configuration of the drainage manifold pipe 1000 does not include the horizontal branch pipe socket 1122 (rubber ring 1124) and the horizontal branch pipe. In order to achieve the above-mentioned effect (prevention of backflow into the lateral branch pipe), the height position of the lower end 1200D, which is the endpoint of the first projection (flow deflection plate 1200), and the height position of the lower end 1330D of the endpoint-side backflow prevention rib (third backflow prevention rib 1330), more precisely, only need to be below the inner diameter of the lateral branch pipe. In the present invention, the bottom of the lateral branch pipe connection 1120 is used as the reference point for the reasons stated above. However, since the above-mentioned effects can be achieved as long as the height position of the lower end 1200D, which is the endpoint of these first protrusions (flow deflection plates 1200), and the height position of the lower end 1330D of the endpoint-side backflow prevention rib (third backflow prevention rib 1330), being below the bottom of the lateral branch pipe connection 1120 does not exclude the case where the height position is below the inner diameter of the lateral branch pipe. This interpretation is common technical knowledge for those skilled in the art, considering the small difference between them (the difference between the bottom of the lateral branch pipe connection 1120 and the inner diameter of the lateral branch pipe) and the above-mentioned effects.

[0030] As described above, the upper pipe 1100 of the drainage manifold 1000 is equipped with an end-side backflow prevention rib (third backflow prevention rib 1330) at the end end side (lower end 1200D side) of the first projection (flow deflection plate 1200) to prevent splashback wastewater from the first projection from flowing back into the lateral branch pipe. In addition, it is equipped with a starting-side backflow prevention rib (fourth backflow prevention rib 1340) at the starting end side (upper end 1200U side) of the first projection (flow deflection plate 1200) to prevent splashback wastewater from the first projection from flowing back into the lateral branch pipe, and has a shape parallel to the axis. The height position of the lower end 1340D of this starting-side backflow prevention rib (fourth backflow prevention rib 1340) is characterized in that it substantially coincides with the upper end 1200U (starting point) of the first projection (flow deflection plate 1200). In this manner, the lower end 1340D of the starting point side backflow prevention rib (fourth backflow prevention rib 1340) extends to a position that is approximately the same height as the upper end 1200U (starting point) of the flow deflection plate 1200. This is preferable because it prevents backflow from the flow deflection plate 1200 to the lateral branch pipe and facilitates the formation of a swirling flow.

[0031] Thus, the drainage manifold 1000 according to this embodiment is equipped with four backflow prevention ribs, which have a shape parallel to the axis: a first backflow prevention rib 1310 and a second backflow prevention rib 1320 for preventing wastewater flowing from a lateral branch pipe into the drainage manifold 1000 from flowing back into the adjacent lateral branch pipe, and an end-side backflow prevention rib (third backflow prevention rib 1330) and a starting-side backflow prevention rib (fourth backflow prevention rib 1340) for preventing splashed wastewater from the first projection (flow deflection plate 1200) from flowing back into the lateral branch pipe. As described above, the first backflow prevention rib 1310 and the second backflow prevention rib 1320 are provided on the inner circumference (inner wall) of the upper pipe 1100 of the drainage manifold 1000, but at least the terminal side backflow prevention rib (third backflow prevention rib 1330) is provided next to the first projection (flow deflection plate 1200) and at a position separated from the inner circumference (inner wall) of the upper pipe 1100. Furthermore, the shapes of the four backflow prevention ribs are similar in that they have a shape parallel to the axis, but other shapes may not match (especially the starting side backflow prevention rib (fourth backflow prevention rib 1340)).

[0032] In addition to the above, the following are other possible scenarios. The lower end of the third backflow prevention rib 1330 (endpoint side backflow prevention rib) is positioned lower than the lower ends of the first backflow prevention rib 1310 and the second backflow prevention rib 1320. However, the lower ends of the first backflow prevention rib 1310, the second backflow prevention rib 1320, and the third backflow prevention rib 1330 (endpoint side backflow prevention rib) may be at the same height as long as they are below the bottom of the pipe at the lateral branch pipe connection 1120. The height position of the lower end 1340D of the fourth backflow prevention rib 1340 (starting point side backflow prevention rib) is determined by the height position where the first projection (flow deflection plate 1200) is installed, and therefore it may not be positioned below the bottom of the lateral branch pipe connection 1120. The relative heights of the lower ends of these four backflow prevention ribs are, in descending order from highest to lowest, the fourth backflow prevention rib 1340 (starting point backflow prevention rib), the first backflow prevention rib 1310 = second backflow prevention rib 1320, and the third backflow prevention rib 1330 (ending point backflow prevention rib). However, the height of the lower end 1340D of the fourth backflow prevention rib 1340 (starting point backflow prevention rib) is determined by the height at which the first projection (drift deflection plate 1200) is installed. Therefore, if the height at which the first projection (drift deflection plate 1200) is installed decreases, the height of the lower end 1340D of the fourth backflow prevention rib 1340 (starting point backflow prevention rib) will also decrease. Depending on the height of the first projection (drift deflection plate 1200), the lower end 1340D of the fourth backflow prevention rib 1340 (starting point backflow prevention rib) may be the lowest of the four backflow prevention ribs.

[0033] Here, the outer layer material (outer layer cover) 1700 wrapped around the drain manifold 1000 will be described with reference to Figures 2 to 4. This outer layer material 1700 corresponds to the outer layer member 700 disclosed in, for example, Japanese Patent Application Publication No. 2021-167557, filed by the applicant of the present application (however, the form and position of the heat-expandable fire-resistant material are different). When the drain manifold 1000 is burned, the heat causes the heat-expandable fire-resistant material 1712 to expand radially inward, crushing the hollow portion of the resin drain manifold 1000 and closing the drain manifold 1000. As a result, the drainage piping structure using these drain manifolds 1000 can block the pipeline to prevent flames, smoke, etc. from flowing in the event of a fire.

[0034] As shown in Figures 2 to 4, the outer layer material 1700 has a three-layer structure and is provided on the outer surface of the upper pipe 1100 and / or lower pipe 1500 of the drain manifold pipe 1000 in the following order from the outer surface of the drain manifold pipe 1000: vibration damping material 1714 (or thermally expandable fire-resistant material 1712), vibration insulator 1720 formed of fire-resistant inorganic fibers, and sound insulation cover 1730.

[0035] Thus, the innermost layer 1710 in this three-layer structure is either a heat-expandable fire-resistant material 1712 or a vibration-damping material 1714. The heat-expandable fire-resistant material 1712 (fire-resistant sheet, fire-resistant tape) is preferably positioned above the upper end 1500U of the lower pipe 1500 and below the upper end 1700U of the outer layer material 1700 (upper end of the sound-insulating cover 1730), as shown in Figure 5(B). Note that Figure 5(B) is Figure 5(A) with the outer layer material 1700 added. Here, since a tape-shaped or sheet-shaped heat-expandable fire-resistant material 1712 is provided as the innermost layer 1710 on the outer surface of the upper pipe 1100 of the drainage manifold 1000, it is preferable in that it can avoid increasing the outer diameter of the drainage manifold 1000, including the outer layer material 1700, compared to, for example, the case where it is provided on the outer surface of the lower pipe 1500 of the portion fitted to the lower end of the upper pipe 1100. Furthermore, it is preferable from the viewpoint of rapid closure of the pipeline in the event of a fire that the height position of the lower end 1200D of the first projection (flow deflection plate 1200) be above the upper end of the heat-expandable fire-resistant material 1712 (i.e., the first projection (flow deflection plate 1200) and the heat-expandable fire-resistant material 1712 do not overlap in the height direction). However, as mentioned above, there are cases where the height position at which the first projection (flow deflection plate 1200) is installed is lower, in which case the height position of the lower end 1200D of the first projection (flow deflection plate 1200) may be below the upper end of the heat-expandable fire-resistant material 1712 (i.e., the first projection (flow deflection plate 1200) and the heat-expandable fire-resistant material 1712 overlap in the height direction). Note that the heat-expandable fire-resistant material 1712 may be in the form of putty.

[0036] The vibration damping material 1714 is formed from a butyl-based material (such as butyl rubber) or an asphalt-based material (such as rubber asphalt or modified asphalt), the sound insulation cover 1730 is formed from a rubber-based material (such as EPDM (ethylene propylene diene rubber)), an elastomer-based material, or a resin-based material (it may be made of hard PVC as well as soft materials such as rubber), and the vibration insulator 1720, which is made of fire-resistant inorganic fibers, consists of an aggregate of fire-resistant inorganic fibers (porous material).

[0037] Here, examples of inorganic fibers include artificial mineral fibers such as glass wool, rock wool, or ceramic fiber, which are preferred not only for their high vibration insulation performance but also for their high sound absorption performance. Vibrations caused by drainage flowing down the upper pipe 1100 or lower pipe 1500 of the drainage manifold 1000 (for example, noise and vibration generated when hitting the drift plate 1200 and swivel vane 1600) are suppressed by the vibration damping material 1714, and then the vibrations are further blocked (and / or the noise associated with the vibrations is absorbed) by the vibration insulator 1720 made of rock wool or the like, and the propagation of noise associated with the vibrations is further blocked by the sound insulation cover 1730 made of a rubber cover made of EPDM or the like. Here, rock wool is a general term for materials manufactured mainly from natural rock or blast furnace slag or other iron slag, and glass wool is a general term for cotton-like materials made of glass fibers, both of which have fire resistance and flame-retardant properties.

[0038] In the following, we may describe cases where butyl rubber is used as the vibration damping material 1714, rock wool as the vibration insulator 1720, and an EPDM rubber cover as the sound insulation cover 1730, but these materials are merely examples. Furthermore, it is preferable for the outer layer material 1700 (innermost layer: heat-expandable fire-resistant material 1712 or vibration damping material 1714, intermediate layer: vibration insulator 1720, outermost layer: sound insulation cover 1730) to contact the outer surface of the drain manifold pipe 1000 via a ring-shaped, elastic ring elastic material (rubber ring 1900) (made of EPDM, etc.) corresponding to the outer diameter of the drain manifold pipe 1000 (more specifically, the outer diameter of the body which is the straight pipe portion below the lateral branch pipe connection part 1120 of the upper pipe 1100) in order to ensure watertightness. In terms of ensuring watertightness, a packing structure can also be used instead of the ring elastic material (rubber ring 1900). Furthermore, when the outer layer material 1700 is adhesively bonded to the outer surface of the drain manifold pipe 1000 via the rubber ring 1900, it is preferable to use, for example, the heat-shrinkable tube 1910 shown in Figures 4 and 10(B) to prevent the rubber ring 1900 and the outer layer material 1700 from shifting relative to the drain manifold pipe 1000 until sufficient time has elapsed for the adhesive bonding performance to be ensured. Note that, in order to improve assembly efficiency, the sound insulation cover 1730 of the outer layer material 1700 and the rubber ring 1900 are made of separate components (even if they are made of the same material).

[0039] From here, the positional relationship between the first projection (flow deflection plate 1200) and the second projection (swivel vane 1600) (the positional relationship when viewed from the upper riser connection 1110 through the inside of the drain manifold 1000 in a direction parallel to the axis of the drain manifold 1000 (= vertical pipe axis of the upper pipe 1100 = vertical pipe axis of the lower pipe 1500)) will be explained in detail with reference to Figures 6 to 8.

[0040] When viewed from the upper pipe connection 1110 through the inside of the drain manifold 1000 in a direction parallel to the axis (as shown in Figure 1), the first projection (flow deflection plate 1200) and the second projection (swirl vane 1600) do not overlap. In this view as shown in Figure 1, because the flow deflection plate 1200 and the swirl vane 1600 do not overlap, the swirling flow induced by the flow deflection plate 1200 is taken over by the swirl vane 1600, as shown by the white arrows in Figure 2, and the swirl vane 1600 exerts the effect of further increasing the swirling component of the swirling flow.

[0041] These conditions will be explained further below. As shown in Figure 6, the positional relationship when the first projection (flow deflection plate 1200) and the second projection (swirl vane 1600) are closest around the axis is when, looking from the upper pipe connection 1110 into the drain manifold 1000 in a direction parallel to the axis (as shown in Figure 1), the lower end 1200D of the first projection (flow deflection plate 1200) and the upper end 1600U of the second projection (swirl vane 1600) do not overlap.

[0042] Furthermore, as shown in Figure 7, the positional relationship when the first projection (flow deflection plate 1200) and the second projection (swirl vane 1600) are furthest apart around the axis is when the drain manifold pipe 1000 is cut by the planar surface 1200P forming the first projection (flow deflection plate 1200), and the lower end 1200PD of the cut surface including this surface 1200P is located at the upper end 1600U, which is the starting point of the second projection (swirl vane 1600).

[0043] As shown when the first projection (drift deflector 1200) and the second projection (swirl vane 1600) are closest (θ=102deg shown in Figure 6) and furthest apart (θ=168deg shown in Figure 7), the first midpoint 1200M of the straight line connecting the upper end 1200U, which is the starting point of the first projection (drift deflector 1200), and the lower end 1200D, which is the ending point, of the first projection (drift deflector 1200), when viewed from the side, is connected to the axis in a plane that includes the first midpoint 1200M and is perpendicular to the axis, forming a first straight line (straight line A), and the second projection (swirl vane 1600), when viewed from the side, is connected to the axis. When a second straight line (straight line B) is connected to the axis in a plane that includes the second midpoint 1600M of the straight line connecting the upper end 1600U, which is the starting point of the (swirl vane 1600), and the lower end 1600D, which is the ending point, and this second straight line (straight line B) is projected in the direction of the axis, the intersection angle θ of the projected first straight line (straight line A) and the second straight line (straight line B) is in the range of 100deg≦θ≦170deg (preferably 102deg≦θ≦168deg) relative to the first straight line (straight line A) in the direction of the swirling flow generated in the drain manifold 1000 (here, the counterclockwise direction when viewed from above).

[0044] When the first projection (flow deflection plate 1200) and the second projection (swirl vane 1600) are closest, as shown in Figure 6, when looking from the upper pipe connection 1110 into the drain manifold 1000 in a direction parallel to the axis (as shown in Figure 1), the lower end 1200D of the first projection flow deflection plate 1200 and the upper end 1600U of the second projection (swirl vane 1600) do not overlap. If this is expressed by the (narrower) intersection angle θ between straight line A and straight line B, then θ is 100 degrees or more (preferably 102 degrees or more). Furthermore, the diagram shown in Figure 6(E) is a cross-sectional view indicated by the 6E-6E line and the arrow attached to it shown in Figure 6(D). This 6E-6E line is a straight line passing through the axis of the drainage manifold 1000 and is a straight line perpendicular to the line that passes through the upper end 1600U, which is the starting point of the swivel vane 1600, and indicates the upper end of the swivel vane 1600.

[0045] When the first projection (flow deflection plate 1200) and the second projection (swirl vane 1600) are at their furthest distance from each other, as shown in Figure 7, when the drain manifold pipe 1000 is cut by the surface 1200P forming the first projection (flow deflection plate 1200), the lower end 1200PD of the cut surface including this surface 1200P is located at the upper end 1600U, which is the starting point of the second projection (swirl vane 1600). If this is expressed by the (narrower) intersection angle θ between straight line A and straight line B, then θ is 170 degrees or less (preferably 168 degrees or less). Note that the diagram shown in Figure 7(C) shows that the lower end 1200PD of the cut surface including the surface 1200P forming the first projection (flow deflection plate 1200) and the upper end 1600U, which is the starting point of the second projection (swirl vane 1600), are aligned on a straight line parallel to the axis of the drain manifold pipe 1000.

[0046] When the intersection angle θ of the (narrower) where straight lines A and B intersect is expressed, it is 100deg ≤ θ ≤ 170deg (preferably 102deg ≤ θ ≤ 168deg). When the intersection angle θ of straight lines A and B is within this range, the swirling flow induced by the drift plate 1200 is taken over by the swirling vane 1600, as shown by the white arrow in Figure 2, and the swirling vane 1600 exhibits the effect of further increasing the swirling component of the swirling flow.

[0047] Figure 8 shows the positional relationship between the flow deflection plate 1200 and the swivel vane 1600 when θ = 132 degrees (Note that Figure 1 also shows the case when θ = 132 degrees). Figure 8(B) shows the 8B-8B section shown in the top view of Figure 8(A), Figure 8(C) shows the 8C-8C section shown in the top view of Figure 8(A), and Figure 8(D) shows the 8D-8D section shown in the top view of Figure 8(A), and is an arbitrary cross-sectional view of the drainage manifold 1000 (θ = 132 degrees) that can simultaneously represent the flow deflection plate 1200 and the swivel vane 1600.

[0048] Herein, the drain manifold pipe 1000, in addition to being made of resin as described above, has the following features: The upper pipe 1100 of the drain manifold pipe 1000 is integrally molded including the first projection (flow deflection plate 1200), and the lower pipe 1500 is integrally molded including the second projection (swivel vane 1600), and the drain manifold pipe 1000 is composed of two members, the upper pipe 1100 and the lower pipe 1500.

[0049] Furthermore, in addition to the features described above, the upper pipe 1100 of the drainage manifold 1000 is integrally molded with a first projection (flow deflection plate 1200) and backflow prevention ribs with a shape parallel to the axis to prevent backflow of drainage into the lateral branch pipes (more specifically, the first backflow prevention rib 1310, the second backflow prevention rib 1320, the end-side backflow prevention rib (third backflow prevention rib 1330), and the starting-side backflow prevention rib (fourth backflow prevention rib 1340), and the lower pipe 1500 is integrally molded with a second projection (swivel vane 1600), and the drainage manifold 1000 is composed of two members, the upper pipe 1100 and the lower pipe 1500.

[0050] By constructing the drainage manifold 1000 with these two components, it is possible to receive the drainage flowing down from the upper floors with a swirling vane (also called a flow straightening plate) and create a swirling flow along the inner wall of the riser, without increasing the number of parts or requiring a complex structure. This ensures that a ventilation core is always provided within the riser, reducing pressure fluctuations caused by blockage within the riser and preventing the water seals of sanitary equipment on each floor from breaking due to pressure fluctuations.

[0051] The upper pipe 1100 of this drainage manifold 1000 is provided with a projection (corresponding to the first projection (flow deflection plate 1200) described above) that protrudes inward in the direction that does not have a lateral branch pipe connection portion 1120 (in this case, the 9 o'clock direction) in order to change the flow of drainage. As an example, more specifically, this first projection is a flow deflection plate 1200 with a planar surface 1200P. As shown in Figures 3, 9, and 10, the upper pipe 1100 of the drainage manifold 1000 is provided with a recess on the outer circumferential surface of the upper pipe 1100 on which this projection (flow deflection plate 1200) is provided, for forming the projection (flow deflection plate 1200).

[0052] Here, although not limited thereto, as mentioned above, the vertical axis of the upper pipe 1100 and the vertical axis of the lower pipe 1500 coincide to form the axis of the drain manifold pipe 1000, and the recess can be provided with a rib 1400 that includes a surface perpendicular to this axis. Here, the recess is an essential configuration, but the rib 1400 is an optional configuration, and it is also acceptable to have no rib 1400, but only a recess for forming a projection (flow deflection plate 1200) on the outer surface of the upper pipe 1100. As will be described in more detail later, the rib 1400 includes a plurality (in this case, four) of body-sized ribs 1410 and a bottommost (one) rubber ring positioning rib 1412 that has a different protrusion length (length t shown in Figure 10(B)) from these body-sized ribs 1410. The outer diameter of the rib 1410 of the same diameter as the body is approximately the same as the outer diameter of the body (=body diameter), and the body is the straight pipe portion directly below the lateral branch pipe connection portion 1120 in the upper pipe 1100, and the body diameter refers to the outer diameter of this portion.

[0053] Here, this recess (whether or not it has ribs) can be designed to reduce vibrations or noise generated when drainage water hits the protrusion (flow deflection plate 1200).

[0054] Here, the effect of reducing vibration or noise generated when drainage hits the protrusion (flow deflection plate 1200) can be achieved by the air that accumulates in the recess (whether or not there are ribs) (or, if ribs 1400 are provided, the air that accumulates in the space 1410S formed between the ribs 1400).

[0055] Here, the effect of reducing vibration or noise generated when drainage strikes the protrusion (flow deflection plate 1200) can be achieved by a member covering the drainage manifold pipe 1000, including the recess (whether or not there are ribs), or by a member fitted into the recess (whether or not there are ribs). Furthermore, although not limited to this, the effect of reducing vibration or noise generated when drainage strikes the protrusion (flow deflection plate 1200) can be achieved by providing a cover material that seals the air accumulating in the recess without ribs (more preferably a cover material that has vibration damping and / or sound insulation performance), or a cover material that seals the air accumulating in the space 1410S formed between the ribs 1400 (more preferably a cover material that has vibration damping and / or sound insulation performance). Furthermore, by providing a material with vibration damping and / or sound insulation properties in the recess without ribs, or by providing a material with vibration damping and / or sound insulation properties in the space 1410S formed between the ribs 1400, it is possible to achieve an effect that reduces vibrations or noise generated when drainage hits the protrusions (flow deflection plates 1200).

[0056] Furthermore, although not limited thereto, when the recess has ribs 1400, multiple ribs 1400 (five in this case) are provided between the upper and lower surfaces of the lateral branch pipe connection portion 1120, and the outer diameter of the lowest rib (rubber ring positioning rib 1412) can be different from the outer diameter of the other normal ribs (ribs 1410 with the same diameter as the body).

[0057] In this case, it is preferable that the outer diameter of the normal ribs (body-same diameter ribs 1410) is approximately the same as the outer diameter of the body below the lateral branch pipe connection portion 1120 of the upper pipe 1100 (=body diameter). By making the outer diameter of multiple (in this case, four) normal ribs (body-same diameter ribs 1410) approximately the same as the outer diameter of the body below the lateral branch pipe connection portion 1120 of the upper pipe 1100 (=body diameter), it is preferable that when attaching an upper pipe cover equipped with Ω-shaped or the like, holes in three directions (three directions other than the 9 o'clock direction) with a maximum diameter approximately the same as or slightly larger than the outer diameter of the lateral branch pipe connection portion 1120, the presence of the normal ribs (body-same diameter ribs 1410) means that the outer diameter in the 9 o'clock direction is the same as the other three directions, thus improving the workability of wrapping the upper pipe cover around the upper pipe 1100.

[0058] Furthermore, the outer diameter of the lowest rib (rubber ring positioning rib 1412) can be larger than the outer diameter of the body portion below the lateral branch pipe connection portion 1120 in the upper pipe 1100 (i.e., larger than the body portion same diameter rib 1410). In this case, as described above with reference to Japanese Patent Application Publication No. 2021-167557, when an outer layer member (here, an outer layer material 1700 composed of three layers) is provided on the drainage manifold pipe 1000 via a rubber ring 1900 provided on the body portion, the following configuration is even more preferable. The height position of the lower surface of the lowest rib (rubber ring positioning rib 1412) is preferably at approximately the same position as the lower surface of the lateral branch pipe connection portion 1120, and the outer diameter of the lowest rib (rubber ring positioning rib 1412) is preferably such that it protrudes outward by an amount exceeding the thickness of the rubber ring 1900 compared to the outer diameter of the body portion.

[0059] In other words, the regular ribs (body-same diameter ribs 1410) other than the bottom rib (rubber ring positioning rib 1412) have an outer diameter that is approximately the same as the outer diameter of the body. Therefore, when placing the upper pipe cover over the upper pipe 1100, the presence of these regular ribs (body-same diameter ribs 1410) means that the outer diameter at the 9 o'clock position is the same as the other three directions, which is preferable because it improves the workability of wrapping the upper pipe cover around the upper pipe 1100. Furthermore, the lowest rib (rubber ring positioning rib 1412) has a rib outer diameter ≠ body outer diameter (rib outer diameter > body outer diameter), the amount of protrusion t on the lower side of the rubber ring positioning rib 1412 is greater than or equal to the thickness of the rubber ring 1900 (for example, 5 mm) (outer diameter of rubber ring positioning rib 1412 > body outer diameter + thickness of rubber ring 1900), and the height position of the lower surface of the lowest rib (rubber ring positioning rib 1412) is approximately the same as the lower surface of the horizontal branch pipe connection part 1120. Therefore, as shown in Figure 10(B), when setting the rubber ring 1900 on the upper pipe 1100 of the drain manifold 1000, the rubber ring 1900 can be easily positioned relative to the upper pipe 1100 of the drain manifold 1000 simply by bringing the upper end surface 1900U of the rubber ring 1900 into contact with the lower surface of the rubber ring positioning rib 1412, which protrudes outward by the amount of protrusion t of the rubber ring positioning rib 1412. This is preferable because it improves the workability of attaching the outer layer material 1700 to the drain manifold 1000.

[0060] Next, the draft angle required for the upper pipe 1100 and lower pipe 1500 of the drain manifold pipe 1000, which are both integrally molded from resin, will be explained with reference to Figures 11 to 14, using the upper pipe 1100 as an example. As described above, the upper pipe 1100 of the drain manifold pipe 1000 is integrally molded including a first projection (flow deflection plate 1200) and backflow prevention ribs with a shape parallel to the axis to prevent backflow of drain into the lateral branch pipes (more specifically, the first backflow prevention rib 1310, the second backflow prevention rib 1320, the end-side backflow prevention rib (third backflow prevention rib 1330), and the starting-side backflow prevention rib (fourth backflow prevention rib 1340). When the upper pipe 1100 is integrally molded from resin, a draft angle is required to remove the molded product from the mold and slide core after molding.

[0061] More specifically, the solid black lines in the top views shown in Figures 11(B) and 13(B) (the parts visible in the top views) require a draft angle that widens towards the top (towards the front of the page) due to the integral molding manufacturing process, and the solid black lines in the bottom view shown in Figure 12(B) (the parts visible in the bottom views) also require a draft angle that widens towards the bottom (towards the front of the page) due to the integral molding manufacturing process. Note that the dotted lines in the top views shown in Figures 11(B) and 13(B) and the bottom view shown in Figure 12(B) do not represent hidden lines, but are drawn as dotted lines to highlight the areas where a draft angle is required, which are represented by solid black lines. Note that the top views shown in Figure 11(B) and Figure 13(B) are the same as Figure 1, and the bottom view shown in Figure 12(B) is the same as Figure 15(B) (although the orientation is different and there are differences in the presence or absence of the lateral branch pipe socket 1122, etc.).

[0062] As an example, as shown in Figure 14, the upper pipe 1100 of the drain manifold pipe 1000 is basically molded using the mold body (first mold 2010 and second mold 2020 in this case) for its outer shape, and using slide cores from each direction (first slide core 2110, second slide core 2120 and third slide core 2130 in this case). The third slide core 2130 is required in the same number as the lateral branch pipe connection section 1120 (3 in this case) (only one is shown in Figure 14). In this type of resin molding, the molding is carried out to avoid undercuts, and a draft angle is provided on the molded product to allow removal of the molded product from the mold and slide core after molding. Also, as shown in Figure 14, the overlapping of the slide cores forms the first internal projection (flow deflection plate 1200) and four backflow prevention ribs. As shown in Figure 14, the slide core has a draft angle, and a molded part with a corresponding draft angle is molded and removed from the slide core.

[0063] The first projection (flow deflection plate 1200) in the upper pipe 1100, which is integrally molded in this manner, is integrally molded with two types of reinforcing ribs, as shown in Figure 15. These are two first reinforcing ribs 1210 parallel to the vertical plane containing the pipe axis of the transverse branch pipe at the 3 o'clock direction, and a second reinforcing rib 1220 connecting these two first reinforcing ribs 1210. These two types of reinforcing ribs reinforce the thin, flat flow deflection plate 1200, preventing damage to the flow deflection plate 1200 from drainage flowing down from the upper floors, and allowing the flow deflection plate 1200 to impart a swirling component to the drainage flowing down from the upper floors, thereby inducing a swirling flow (as described above, the swirling flow induced by the flow deflection plate 1200 is taken over to the swirling vane 1600, further increasing the swirling component of the swirling flow).

[0064] <First variation> Referring to Figure 16, a first modified example of the drain manifold according to this embodiment will be described. The lower pipe 1500 of the drain manifold 1000 (described above) shown in Figure 16(A) was equipped with a socket (lower pipe socket) 1520 for joining the upper pipe 1100 and the lower pipe 1500 by fitting the lower end of the upper pipe 1100 onto it. However, the drain manifold 1001 according to this modified example, shown in Figures 16(B) to 16(E), does not have this lower pipe socket. As shown in Figures 16(B) to 16(E), the drain manifold 1001 according to this modified example is composed of a lower pipe 1501 without a lower pipe socket and an upper pipe 1101 (which is basically the same as the upper pipe 1100). In the drain manifold 1001 according to this modified example, a socket 1502 is used to join the upper pipe 1101 and the lower pipe 1501. Here, it is preferable that the outer diameter and inner diameter of the upper pipe 1101 at the lower end and the outer diameter and inner diameter of the lower pipe 1501 at the upper end are the same. The upper pipe 1101 and the lower pipe 1501 are joined by fitting such a socket 1502 onto the lower end of the upper pipe 1101 and the upper end of the lower pipe 1501. More specifically, the upper pipe 1101 and the lower pipe 1501 are joined by adhesive bonding the lower end of the upper pipe 1101 to one side of the socket 1502 and adhesive bonding the upper end of the lower pipe 1501 to the other side of the socket 1502. By dividing the connecting component in this way (dividing the lower pipe, which previously had an integrated lower pipe socket, into a separate socket and a lower pipe without a lower pipe socket), it becomes possible to change the material of only that component (in this case, the connecting component, the socket). For example, transparent material can be used for the connecting component to allow visual inspection of the connection, or the reliability of the joint can be improved by making only the connecting component stronger than other components (upper pipe, lower pipe, etc.). By adopting such a structure, quality can be stabilized without requiring a complex structure.

[0065] <Second variation> Referring to Figure 17, a second modification of the drainage manifold according to this embodiment will be described. The drainage manifold 1000 described above had a three-layer outer layer material (outer layer cover) 1700 wrapped around it. As described above, a sound insulation cover 1730 was provided as the outermost layer of this outer layer cover 1700. This sound insulation cover 1730 was an integral part comprising a straight section mainly wrapped around the upper pipe 1100 and a tapered section mainly wrapped around the lower pipe 1500. The sound insulation cover 1731 according to this modification, as shown in Figure 17(A), is composed of two structures: a straight section 1731U mainly wrapped around the upper pipe 1100 and a tapered section 1731D mainly wrapped around the lower pipe 1500. As for the material, as described above, it is formed by including rubber-based (EPDM (ethylene propylene diene rubber) etc.), elastomer-based or resin-based material, and may be made of hard PVC as well as soft materials such as rubber.

[0066] Furthermore, in this modified example, the vibration insulator 1721, formed from fire-resistant inorganic fibers (rock wool, for example) in the intermediate layer of the three-layer outer layer material (outer layer cover) 1700, is bent from its planar shape shown in the unfolded view in the lower part of Figure 17(B) to a cylindrical shape, as shown by the dashed line, so that the left and right ends touch, resulting in a three-dimensional vibration insulator 1721 with a straight section and a tapered section, as shown in the upper part of Figure 17(B). As shown in Figure 17(C), the straight section 1731U of the sound insulation cover 1731 is placed over the straight section of this three-dimensional vibration insulator 1721, and as shown in Figure 17(D), the portion of the vibration insulator 1721 corresponding to the straight section 1731U of the sound insulation cover 1731 (approximately the upper half) is covered by the sound insulation cover, while the portion of the vibration insulator 1721 corresponding to the tapered section 1731D of the sound insulation cover 1731 (approximately the lower half) is exposed. Next, as shown in Figure 17(E), the tapered portion 1731D of the sound insulation cover 1731 is placed over the tapered portion of the vibration insulator 1721, and as shown in Figure 17(F), the entire vibration insulator 1721 is covered by the straight portion 1731U and the tapered portion 1731D of the sound insulation cover 1731.

[0067] In the state shown in Figure 17(F), ALCG tape 1733 (an aluminum glass cloth tape, a base material made by laminating glass cloth onto aluminum foil and applying adhesive to one side) is wrapped around the straight section 1731U and the tapered section 1731D of the sound insulation cover 1731 to integrate them and complete the outer layer material (outer cover) (in this case, a two-layer structure). This two-layer outer layer material (outer cover) is assembled to a drainage manifold equipped with the innermost layer 1710 (thermal expansion fire-resistant material 1712 and vibration damping material 1714), or the innermost layer 1710 (thermal expansion fire-resistant material 1712 and vibration damping material 1714) is attached to this two-layer outer layer material (outer cover) and then assembled to the drainage manifold to complete the assembly of the drainage manifold. By dividing the sound insulation cover into two sections, upper and lower, the undercut shape of the sound insulation cover can be eliminated, making assembly with the vibration insulator (rock wool) easier. This structure allows for stable quality without requiring a complex structure.

[0068] <Third variation> Referring to Figure 18, a third modification of the drainage manifold according to this embodiment will be described. First, the drainage manifold 1002 shown in Figure 18(A) will be described. This drainage manifold 1002 is a drainage manifold mainly suitable for use on the lowest floor, and the upper pipe is the same as the upper pipe 1100 described above, while the lower pipe does not have a swivel vane and has a reduced diameter section. In contrast, the drainage manifold 1003 according to this modification shown in Figures 18(B) to 18(D) is the same as the drainage manifold 1002 in that it is mainly suitable for use on the lowest floor and the lower pipe does not have a swivel vane, but it differs from the drainage manifold 1002 in that the lower pipe does not have a reduced diameter section and the lower pipe socket described in the first modification described above. As shown in Figures 18(B) to 18(D), this drainage manifold 1003 consists of an upper pipe 1101 (basically the same as the upper pipe 1100), an increaser 1505 (sometimes called a reducing socket or different diameter socket), and a VU pipe 1503 (a straight pipe made of rigid polyvinyl chloride). For example, an increaser 1505 with a nominal diameter of 150 x 125 is used, and a VU pipe 1503 with a nominal diameter of 125 is used. By dividing the lower pipe, which is suitable for use on the lowest floor, in this way (dividing the lower pipe, in which the lower pipe socket and reduced diameter section were integrated, into an increaser and a straight pipe), it becomes possible to change the material of only that part (in this case, the increaser, which is a connecting part). For example, a transparent material can be used for the connecting part so that the connection can be visually confirmed, or the reliability of the joint can be increased by making only the connecting part stronger than other parts (upper pipe, lower pipe, etc.). This structure allows for stable quality without requiring a complex structure. In this modified example, a lower pipe with a reduced diameter section but without a lower pipe socket may be used, and the socket described in the first modified example may be used instead of the lower pipe socket.

[0069] As described above, the drainage manifold 1000 according to this embodiment can reduce noise or vibration associated with the generation of swirling flow, reduce assembly man-hours, stabilize quality, and provide a drainage manifold that prevents the water seals of sanitary equipment on each floor from breaking due to pressure fluctuations by providing a ventilation core inside the riser to allow the drainage flowing down from the upper floors to flow along the inner wall surface of the riser as a swirling flow.

[0070] It should be noted that the embodiments disclosed herein are illustrative and not restrictive in all respects. The scope of the present invention is indicated by the claims rather than by the foregoing description, and all modifications within the meaning and scope equivalent to the claims are intended to be included. [Industrial applicability]

[0071] The present invention is particularly preferable for resin drainage manifolds installed through the floor slabs of buildings, as it can reduce noise or vibration associated with the generation of swirling flow, reduce assembly man-hours, stabilize quality, and is especially preferable in that it can reduce pressure fluctuations due to blockage inside the riser by providing a ventilation core within the riser so that the drainage flowing down from the upper floors flows along the inner wall surface of the riser, thereby preventing the water seals of sanitary equipment on each floor from breaking due to pressure fluctuations. [Explanation of symbols]

[0072] 1000 Drainage collection pipe 1100 Upper pipe 1200 Current plate (first protrusion) 1310 First backflow prevention rib 1320 Second backflow prevention rib 1330 Third backflow prevention rib (endpoint side backflow prevention rib) 1340 Fourth backflow prevention rib (starting point side backflow prevention rib) 1410 Ribs of the same diameter on the body 1412 Rubber ring positioning rib 1500 lower tube 1600 Swirling blades (second protrusion) 1700 Outer layer material

Claims

1. A resin drainage manifold pipe placed in a through-hole in the floor slab of a building, The drainage manifold includes an upper pipe that protrudes above the floor slab and a lower pipe connected below the upper pipe. The upper pipe includes an upper pipe connection section for connecting an upper pipe that allows drainage from the upper floor to flow in, and at least one lateral branch pipe connection section for connecting a lateral branch pipe above the floor slab. The lower pipe includes a lower pipe connection section for connecting a lower pipe that drains wastewater to the floor below. The upper pipe is provided with a projection that protrudes inward in order to change the flow of drainage in the direction that does not have the lateral branch pipe connection portion. The upper tube has a recess on its outer surface at a height that overlaps with the projection, which is recessed more than the diameter of the body. The vertical axis of the upper pipe and the vertical axis of the lower pipe coincide to form the axial center of the drainage manifold. The recess comprises a rib including a surface perpendicular to the axis, A drainage manifold pipe characterized in that a plurality of ribs are provided between the upper surface and the lower surface of the lateral branch pipe connection portion, and the plurality of ribs include ribs whose outer diameter at the rib is approximately the same as the outer diameter of the body portion of the upper pipe below the lateral branch pipe connection portion.

2. A resin drainage manifold pipe placed in a through-hole in the floor slab of a building, The drainage manifold includes an upper pipe that protrudes above the floor slab and a lower pipe connected below the upper pipe. The upper pipe includes an upper pipe connection section for connecting an upper pipe that allows drainage from the upper floor to flow in, and at least one lateral branch pipe connection section for connecting a lateral branch pipe above the floor slab. The lower pipe includes a lower pipe connection section for connecting a lower pipe that drains wastewater to the floor below. The upper pipe is provided with a projection that protrudes inward in order to change the flow of drainage in the direction that does not have the lateral branch pipe connection portion. The upper tube has a recess on its outer surface at a height that overlaps with the projection, which is recessed more than the diameter of the body. The vertical axis of the upper pipe and the vertical axis of the lower pipe coincide to form the axial center of the drainage manifold. The recess comprises a rib including a surface perpendicular to the axis, A drainage manifold pipe characterized in that multiple ribs are provided between the upper and lower surfaces of the lateral branch pipe connection portion, and the outer diameter of the lowest rib is different from the outer diameter of the other normal ribs.

3. The drainage manifold according to claim 2, characterized in that the outer diameter of the lowest rib is larger than the outer diameter of the body portion below the lateral branch pipe connection portion of the upper pipe.

4. An outer layer member is provided on the drain manifold via a rubber ring provided on the body portion. The height position of the lower surface of the lowest rib is approximately the same as the height position of the lower surface of the horizontal branch pipe connection, The drainage manifold according to claim 3, characterized in that the outer diameter of the lowest rib exceeds the outer diameter of the body by the thickness of the rubber ring and protrudes outward.

5. The drainage manifold according to any one of claims 1 to 4, characterized in that the recess has the function of reducing vibration or noise generated when drainage strikes the protrusion.

6. The drainage manifold according to claim 5, characterized in that it has a function to reduce vibration or noise by air accumulating in the recess.

7. The drain manifold according to claim 5, characterized in that a member covering the drain manifold, including the recess, or a member fitted into the recess, provides a function to reduce vibration or noise.

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