Drainage collecting pipe

Abstract

To provide a drainage collecting pipe made of resin that can sufficiently provide a turning component to drainage flows down from an upper floor.SOLUTION: A drainage collecting pipe 1000 includes an upper pipe 1100 and a lower pipe 1500. The upper pipe 1100 includes an upper vertical pipe connecting part 1110 for connecting an upper vertical pipe and at least one horizontal branch pipe connection part 1120 for connecting a horizontal branch pipe. The lower pipe 1500 includes a lower vertical pipe connection part 1510 for connecting a lower vertical pipe. The upper pipe 1100 has a drift plate 1200 as a first protrusion configured to protrude on an inner periphery in order to change flow of drainage in a direction along which the horizontal branch pipe connection part 1120 is not provided. The lower pipe 1500 has a swirl vane 1600 as a second protrusion configured to protrude on the inner periphery in order to change the flow of the drainage. The drift plate 1200 is arranged at a height position where a top edge 1200U being a starting point is below a pipe axis of the horizontal branch pipe connection part 1120 and a lower edge 1200D being an end point is above an upper edge 1600U of the swirl vane 1600.SELECTED DRAWING: Figure 5

Description

[Technical field]

[0001] The present invention relates to a drainage collector pipe made of resin that is installed by penetrating the floor slab of a building, the drainage collector pipe including an upper pipe having an upper riser pipe connection portion that protrudes above the floor slab and connects an upper riser pipe that allows drainage water to flow in from the upper floor, and at least one horizontal branch pipe connection portion that connects a horizontal branch pipe above the floor slab, and a lower pipe that is connected below the upper pipe, and in particular to a drainage collector pipe that does not have a large number of parts, does not have a complex structure, and can stabilize quality, and that can turn the drainage water flowing down from the upper floors into a swirling flow along the inner wall surface of the riser pipe by providing an air core in the riser pipe, thereby reducing pressure fluctuations due to blockages in the riser pipe, and preventing the breakage of the seal water of sanitary equipment, etc. on each floor due to pressure fluctuations. [Background technology]

[0002] Water supply and drainage facilities are installed in apartment buildings, office buildings, etc. Of these, the most widely known drainage facilities are those with a drainage piping structure that includes vertical pipes (standpipes, upper standpipes, lower standpipes) that run vertically through each floor of the building, horizontal pipes (horizontal branch pipes, branch pipes) installed on each floor, and drainage pipe joints (also called drainage collector pipes, drainage pipe joints, drainage collector joints) that connect these.

[0003] Such a drainage pipe joint includes a pipe body (main body, upper pipe) that is placed in a through hole in a floor slab when installed in a building, and the main body has an upper standpipe connection part at its upper end that can be connected to an upstream upper standpipe, a side branch pipe connection part at its side that can be connected to a side branch pipe, and a lower pipe connection part at its lower end that can be connected to a downstream piping member. Furthermore, as such a drainage pipe joint, one formed from one or more injection molded resin products is widely known.

[0004] In a drainage manifold joint that connects such a vertical drainage pipe and a horizontal branch pipe, the drainage flowing down from the upper floors is received by a swirling vane and turned into a swirling flow along the inner wall surface of the riser pipe, and an air vent is always provided in the riser pipe to reduce pressure fluctuations due to blockages in the riser pipe and prevent the sealing of water in sanitary equipment, etc. on each floor from being broken due to pressure fluctuations. This technology is disclosed in JP 2011-236676 A (Patent Document 1).

[0005] The drain pipe joint disclosed in Patent Document 1 is a drain pipe joint comprising a main body body having an inner diameter larger than that of the vertical pipes connected above and below, at least one horizontal branch pipe connection portion arranged to protrude from the wall surface of the main body body, and a tapered tubular portion arranged below the main body body and gradually reducing in diameter toward the lower end, and is characterized in that the joint has a first swirl vane arranged inside the main body body, a second swirl vane arranged below the lower end of the first swirl vane, and a third swirl vane arranged below the lower end of the second swirl vane and within the tapered tubular portion, and the first to third swirl vanes are arranged so that wastewater received by the first swirl vane becomes a swirling flow that is received by the second swirl vane and not received by the third swirl vane. As shown in FIG. 5 of Patent Document 1, in this drain pipe joint, the main body portion and the tapered tubular portion, and the first and second swirl vanes are configured as separate members. [Prior art documents] [Patent documents]

[0006] [Patent Document 1] JP 2011-236676 A Summary of the Invention [Problem to be solved by the invention]

[0007] However, the drain pipe joint disclosed in Patent Document 1 has the problem that, as mentioned above, the first and second swirl vanes and the main body of the drain pipe joint, which is the main body barrel and tapered tube portion, are made from different resin parts, resulting in a large number of parts and a complex structure.

[0008] The present invention has been developed in consideration of the above-mentioned problems, and its object is to provide a drainage manifold that does not have a large number of parts, does not have a complex structure, can stabilize quality, and can prevent the pressure fluctuations caused by blockages in the riser pipe by making the drainage flowing down from the upper floors into a swirling flow along the inner wall surface of the riser pipe by providing an air core inside the riser pipe, thereby preventing the seal water of sanitary equipment, etc. on each floor from being broken due to pressure fluctuations. [Means for solving the problem]

[0009] In order to achieve the above object, the resin joint according to the present invention employs the following technical measures.

[0010] The drainage collecting pipe of the present invention is a resin drainage collecting pipe that is placed in a through hole of a floor slab of a building, the drainage collecting pipe including an upper pipe that protrudes above the floor slab and a lower pipe that is connected below the upper pipe, the vertical pipe axis of the upper pipe and the vertical pipe axis of the lower pipe coincide to form the axis of the drainage collecting pipe, the upper pipe includes an upper riser pipe connection portion that connects an upper riser pipe that allows drainage water to flow in from the upper floor and at least one horizontal branch pipe connection portion that connects a horizontal branch pipe above the floor slab, the lower pipe includes a downward riser pipe connection portion that connects a downward riser pipe that allows drainage water to flow out to the lower floor, the upper pipe includes a first protrusion that protrudes on the inner circumference to change the flow of drainage water in a direction that does not include the horizontal branch pipe connection portion, the lower pipe includes a second protrusion that protrudes on the inner circumference to change the flow of drainage water, and the height position of the first protrusion is characterized in that the upper end, which is the starting point, is lower than the pipe axis of the horizontal branch pipe connection portion and the lower end, which is the end point, is higher than the upper end of the second protrusion.

[0011] Preferably, when looking inside the drainage collecting pipe from the upper riser pipe connection portion in a direction parallel to the axis, the first protrusion and the second protrusion are configured not to overlap.

[0012] More preferably, when looking inside the drainage collecting pipe from the upper riser pipe connection portion in a direction parallel to the axis, the lower end of the first protrusion does not overlap with the upper end of the second protrusion.

[0013] More preferably, the positional relationship between the first protrusion and the second protrusion around the axis can be configured so that when the drainage manifold is cut by a plane forming the first protrusion, the lower end of the cut surface including the plane is positioned at the starting point of the second protrusion.

[0014] More preferably, a first straight line connecting a first midpoint of a line connecting the starting point and end point of the first protrusion when viewed from the side to the axis in a plane that includes the first midpoint and is perpendicular to the axis, and a second straight line connecting a second midpoint of a line connecting the starting point and end point of the second protrusion when viewed from the side to the axis in a plane that includes the second midpoint and is perpendicular to the axis, when projected in the axial direction, can be configured so that the intersection angle θ between the projected first straight line and the second straight line is in the range of 100deg≦θ≦170deg in the direction of the swirling flow generated in the drainage manifold relative to the first straight line.

[0015] More preferably, the height position of the lower end of the first protrusion is below the pipe bottom of the horizontal branch pipe connection portion, and the upper pipe is provided with an end-side backflow prevention rib having a shape parallel to the axis at the end side of the first protrusion to prevent drainage water from the first protrusion from flowing back into the horizontal branch pipe, and the height position of the lower end of the end-side backflow prevention rib is below the pipe bottom of the horizontal branch pipe connection portion and above the lower end of the first protrusion.

[0016] More preferably, the upper pipe is provided with a start-side backflow prevention rib having a shape parallel to the axis on the start side of the first protrusion to prevent drainage water from the first protrusion from flowing back into the horizontal branch pipe, and the height position of the lower end of the start-side backflow prevention rib can be configured to approximately coincide with the upper end of the first protrusion.

[0017] More preferably, the upper tube is integrally molded including the first protrusion, and the lower tube is integrally molded including the second protrusion, so that the upper tube and the lower tube are configured as two components.

[0018] More preferably, the upper pipe is integrally molded including the first protrusion and a backflow prevention rib having a shape parallel to the axis for preventing wastewater from flowing back into the horizontal branch pipe, and the lower pipe is integrally molded including the second protrusion, and can be configured to be composed of two parts, the upper pipe and the lower pipe.

[0019] More preferably, the height position of the upper end, which is the starting point of the first protrusion, is located below the pipe axis of the lateral branch pipe connection portion, so that all of the lateral branch pipe connection portions are configured to be located in a position facing the upper surface of the first protrusion.

[0020] More preferably, the inside of the drainage collecting pipe is connected to the upper riser pipe connection in a direction parallel to the axis. In view of this, the ratio of the ventilation area excluding the first projection and the second projection to the inner diameter area of ​​the upper riser pipe can be configured to be 60% or more and 90% or less. Effect of the Invention

[0021] According to the present invention, it is possible to provide a drainage collecting pipe that does not have a large number of parts, does not have a complex structure, and can stabilize quality, and that can prevent the seals of sanitary equipment, etc. on each floor from being broken due to pressure fluctuations by providing an air core inside the riser pipe to turn the drainage water flowing down from the upper floor into a swirling flow along the inner wall surface of the riser pipe and reducing pressure fluctuations due to blockages inside the riser pipe. [Brief description of the drawings]

[0022] [Figure 1] 1 is a top view of a drainage collecting pipe 1000 according to an embodiment of the present invention. [Diagram 2] 2 is a cross-sectional view taken along line 2-2 in FIG. [Diagram 3] 3 is a cross-sectional view taken along line 3-3 in FIG. [Figure 4] FIG. 3 is an enlarged view of region 4 in FIG. [Diagram 5] 13 is a diagram for explaining the height position of the deflection plate 1200, the lower end position of the third backflow prevention rib 1330, and the height direction position of the thermally expandable fire-resistant material 1712. FIG. [Figure 6] 13 is a diagram for explaining the positional relationship between the deflector 1200 and the swirl vane 1600 (closest position: θ=102 deg.). [Figure 7] 13 is a diagram for explaining the positional relationship between the deflector plate 1200 and the swirl vanes 1600 (closest distance: θ=168 deg.). [Figure 8] 13 is a diagram for explaining the positional relationship (θ=132 deg) between the deflector plate 1200 and the swirl vane 1600. FIG. [Figure 9] FIG. 1 is a diagram (part 1) for explaining ribs 1400 (body equal diameter rib 1410, rubber ring positioning rib 1412) provided on the outer periphery of a deflection plate 1200 in an upper pipe 1100 of a drainage collecting pipe 1000. [Figure 10] FIG. 2 is a second diagram for explaining the ribs 1400 (body equal diameter rib 1410, rubber ring positioning rib 1412) provided on the outer periphery of the deflection plate 1200 in the upper pipe 1100 of the drainage collecting pipe 1000. [Figure 11]FIG. 1 is a diagram (part 1) for explaining the draft angle in an upper pipe 1100 of a drainage collecting pipe 1000. [Figure 12] FIG. 2 is a diagram (part 2) for explaining the draft angle in the upper pipe 1100 of the drainage collecting pipe 1000. [Figure 13] FIG. 3 is a diagram (part 3) for explaining the draft angle in the upper pipe 1100 of the drainage collecting pipe 1000. [Figure 14] FIG. 4 is a diagram (part 4) for explaining the draft angle in the upper pipe 1100 of the drainage collecting pipe 1000. [Figure 15] 13 is a diagram for explaining a deflector plate reinforcing rib in an upper pipe 1100 of a drainage collecting pipe 1000. FIG. [Figure 16] FIG. 11 is a diagram for explaining a first modified example in the embodiment of the present invention. [Figure 17] FIG. 11 is a diagram for explaining a second modified example in the embodiment of the present invention. [Figure 18] FIG. 11 is a diagram for explaining a third modified example in the embodiment of the present invention. [Figure 19] FIG. 13 is a diagram illustrating a fourth modified example of the embodiment of the present invention. [Figure 20] FIG. 13 is a diagram for explaining a fifth modified example in the embodiment of the present invention. [Figure 21] FIG. 13 is a diagram for explaining a sixth modified example in the embodiment of the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0023] A drainage collecting pipe 1000 according to an embodiment of the present invention will be described in detail below with reference to Figs. 1 to 15. In the following description, the outer peripheral surface, the outer surface, and the outside, the outer layer side, the outer peripheral side, and the outside, the inner layer side, the inner peripheral side, and the inside, and the thermally expandable fireproof material, the fireproof material, and the thermally expandable material may not be clearly distinguished from each other. Also, in the cross-sectional views, different members may not be clearly distinguished from each other depending on the type of hatching. Also, in order to facilitate understanding of the present invention, the directions of the horizontal branch pipes are indicated in the top view or bottom view as 0 o'clock, 3 o'clock, 6 o'clock, and 9 o'clock, like the hours of a clock. In some cases, the symbol is specified by using a needle. In addition, the symbol (consisting of a number + (if necessary) an alphabet) attached to a dashed line with an arrow in the figure indicates the figure number with the number and the alphabet indicates the branch number (A, B, C, etc.) in the figure, and a cross-sectional view is shown in the figure specified by the symbol. In addition, the symbol (consisting of a number + (if necessary) an alphabet) attached to a dotted line in the figure indicates the figure number with the number and the alphabet indicates the branch number (A, B, C, etc.) in the figure, and an enlarged view is shown in the figure specified by the symbol (excluding dotted lines with a symbol including the alphabet S indicating space). In addition, the drainage collecting pipe according to the present embodiment described below is not limited to any of the super high-rise floor use, the lowest floor use, and the intermediate floor use, unless otherwise specified.

[0024] The general structure of the drainage collecting pipe 1000 will be described with reference to Figure 1, which shows a top view of the drainage collecting pipe 1000 in this embodiment, Figure 2, which shows a cross-sectional view along 2-2 in Figure 1, Figure 3, which shows a cross-sectional view along 3-3 in Figure 1, and Figure 4, which is an enlarged view of region 4 in Figure 2.

[0025] The drainage collecting pipe 1000 shown in these figures is a resin drainage collecting pipe arranged in a through hole of the floor slab of a building. This drainage collecting pipe 1000 includes an upper pipe 1100 protruding above the floor slab and a lower pipe 1500 connected below the upper pipe 1100, and the lower pipe 1500 is connected (adhesively joined) to the lower end of the upper pipe 1100 by fitting it externally at the height position of the floor slab. In addition, the positional relationship in the height direction between the drainage collecting pipe 1000 and the floor slab is preferably such that the upper end of the thermally expandable fireproof material 1712 described later is below the upper surface of the floor slab and the lower end of the thermally expandable fireproof material 1712 is above the lower surface of the floor slab, and the lower end of the thermally expandable fireproof material 1712 may be below the lower surface of the floor slab. Here, the vertical pipe axis of the upper pipe 1100 and the vertical pipe axis of the lower pipe 1500 coincide with each other to form the axial center of the drainage collecting pipe 1000. The upper pipe 1100 includes an upper riser pipe connection part 1110 that connects an upper riser pipe that allows wastewater to flow in from the upper floor, and at least one horizontal branch pipe connection part 1120 that connects a horizontal branch pipe above the floor slab, and the lower pipe 1500 includes a lower riser pipe connection part 1510 that connects a lower riser pipe that allows wastewater to flow out to the lower floor. As an example, the upper riser pipe connection part 1110 is provided with a riser pipe receiving port 1112 and a rubber ring 1114, through which the upper riser pipe and the drainage collecting pipe 1000 are connected, and the horizontal branch pipe connection part 1120 is provided with a horizontal branch pipe receiving port 1122 and a rubber ring 1124, through which the horizontal branch pipe and the drainage collecting pipe 1000 are connected.

[0026] 1, in the top view of the drainage collecting pipe 1000 seen from above, the drainage collecting pipe 1000 is provided with side branch pipe connecting parts 1120 at the 0 o'clock, 3 o'clock, and 6 o'clock positions, and no side branch pipe connecting part 1120 is provided at the 9 o'clock position, but it is sufficient to provide at least one side branch pipe connecting part 1120. Also, like this drainage collecting pipe 1000, side branch pipe connecting parts 1120 may be provided at three positions other than the 9 o'clock position, and the side branch pipe connecting parts 1120 on the side where the side branch pipe is not connected may be blocked with a plug (this plug may be blocked via the side branch pipe receiving port 1122 and the rubber ring 1124).

[0027] A first backflow prevention rib 1310 for preventing wastewater flowing from the side branch pipe into the drainage collecting pipe 1000 from flowing back into the adjacent side branch pipe is provided between the side branch pipe connecting part 1120 at the 0 o'clock position and the side branch pipe connecting part 1120 at the 3 o'clock position, and a second backflow prevention rib 1320 is provided between the side branch pipe connecting part 1120 at the 3 o'clock position and the side branch pipe connecting part 1120 at the 6 o'clock position. These first backflow prevention rib 1310 and second backflow prevention rib 1320 are provided so as to be located on the inner circumference (inner wall) of the upper pipe 1100 of the drainage collecting pipe 1000 and to have a shape parallel to the axis.

[0028] The upper pipe 1100 of this drainage collecting pipe 1000 is provided with a first projection that protrudes inwardly in a direction in which the horizontal branch pipe connecting portion 1120 is not provided (here, the 9 o'clock direction) in order to change the flow of drainage. As one example, this first projection is a deflection plate 1200 with a flat surface 1200P. Furthermore, the lower pipe 1500 of this drainage collecting pipe 1000 is provided with a second projection that protrudes inwardly in order to change the flow of drainage. As one example, this second projection is a swirl vane 1600 whose surface is formed to include a curved surface. The drainage collecting pipe 1000 according to this embodiment is provided with such deflection plate 1200 (first projection) and swirl vane 1600 (second projection), and also with a first projection (deflection plate 1200, hereinafter simply referred to as As shown in Figures 2 and 5(A), the height position of the second protrusion (swirl vane 1600, sometimes referred to as swirl vane or deflection vane 1200) is characterized in that the upper end 1200U, which is the starting point, is below the pipe axis of the horizontal branch pipe connection part 1120 and the lower end 1200D, which is the end point, is above the upper end 1600U of the second protrusion (swirl vane 1600, sometimes referred to simply as swirl vane or swirl vane 1600). In this way, since upper end 1200U, which is the starting point of deflection plate 1200, is located below the pipe axis of horizontal branch pipe connection portion 1120, it is possible to prevent the wastewater to which a swirling component has been imparted by deflection plate 1200 from flowing back into the horizontal branch pipe, and since lower end 1200D, which is the end point of deflection plate 1200, is located above upper end 1600U of swirl vane 1600, the swirling flow induced by deflection plate 1200 is carried over to swirl vane 1600, as shown by the white arrow in Figure 2, and the swirling component of the swirling flow is further increased by swirl vane 1600, thereby exerting the effect of the above-mentioned.

[0029] 2 and 5(A), the height position of the lower end 1200D, which is the end point of this first projection (drift plate 1200), is lower than the pipe bottom of the horizontal branch pipe connecting part 1120. Since the height position of the lower end 1200D of the drift plate 1200 is lower than the pipe bottom of the horizontal branch pipe connecting part 1120 in this way, it is preferable in that backflow from the drift plate 1200 to the horizontal branch pipe can be prevented and a swirling flow can be easily formed. In addition, the upper pipe 1100 of the drainage collecting pipe 1000 is provided with an end-side backflow prevention rib (third backflow prevention rib 1330) having a shape parallel to the axis on the end side (lower end 1200D side) of the first projection (drift plate 1200) to prevent the splashing drainage from the first projection from flowing back into the horizontal branch pipe. 2 and 5(A), the height position of the lower end 1330D of the end-side backflow prevention rib (third backflow prevention rib 1330) is lower than the pipe bottom of the horizontal branch pipe connecting part 1120 and higher than the lower end 1200D of the first protrusion. Since the height position of the lower end 1330D of the end-side backflow prevention rib (third backflow prevention rib 1330) is lower than the pipe bottom of the horizontal branch pipe connecting part 1120, backflow from the deflection plate 1200 to the horizontal branch pipe can be prevented, and since the height position of the lower end 1330D of the end-side backflow prevention rib (third backflow prevention rib 1330) is higher than the lower end 1200D of the first protrusion, a space 1330S can be formed, which is preferable in that a swirling flow is easily formed. The presence of this space 1330S causes the swirling flow induced by the first protrusion (deflection plate 1200) to flow downward without being obstructed by the end-point backflow prevention rib (third backflow prevention rib 1330), as shown by the white arrow in Figure 2, and is passed on to the second protrusion (swirl blade 1600), thereby exerting the effect of further increasing the swirling component of the swirling flow by the swirl blade 1600.

[0030] 4, in the horizontal branch pipe connecting part 1120, the pipe bottom of the horizontal branch pipe connecting part 1120, the pipe bottom of the horizontal branch pipe receiving port 1122, the outer diameter of the horizontal branch pipe (pipe bottom of the outer diameter), and the inner diameter of the horizontal branch pipe (pipe bottom of the inner diameter, horizontal branch pipe bottom) are formed in this order from the lower side in the height direction to the higher side. As described above, the height position of the lower end 1200D, which is the end point of this first protrusion (drift plate 1200), and the height position of the lower end 1330D of the end point side backflow prevention rib (third backflow prevention rib 1330) are specified based on the pipe bottom of the horizontal branch pipe connecting part 1120, because the (minimum) configuration of the drainage collecting pipe 1000 does not include the horizontal branch pipe receiving port 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), strictly speaking, it is sufficient that the height position of the lower end 1200D, which is the end point of the first protrusion (deflection plate 1200), and the height position of the lower end 1330D of the end point side backflow prevention rib (third backflow prevention rib 1330) are both below the inner diameter of the lateral branch pipe. In the present invention, the pipe bottom of the horizontal branch pipe connecting part 1120 is used as the reference for the reasons mentioned above, but since the above-mentioned effects can be achieved as long as it is below the inner diameter of the horizontal branch pipe, with regard to the height position of the lower end 1200D, which is the end point of these first protrusions (deflection plate 1200), and the height position of the lower end 1330D of the end point side backflow prevention rib (third backflow prevention rib 1330), being below the pipe bottom of the horizontal branch pipe connecting part 1120 does not exclude the case where it is below the inner diameter of the horizontal branch pipe, which is common technical knowledge of those skilled in the art, in light of the small difference between them (the difference between the pipe bottom of the horizontal branch pipe connecting part 1120 and the inner diameter of the horizontal branch pipe) and the above-mentioned effects.

[0031] As described above, the upper pipe 1100 of the drainage collecting pipe 1000 has a first protrusion (a deflector plate 1200 In addition to / instead of providing an end-side backflow prevention rib (third backflow prevention rib 1330) on the end side (lower end 1200D side) of the first projection (deflection plate 1200) for preventing the rebound wastewater from the first projection from flowing back into the side branch pipe, a start-side backflow prevention rib (fourth backflow prevention rib 1340) having a shape parallel to the axis is provided on the start-side (upper end 1200U side) of the first projection (deflection plate 1200) for preventing the rebound wastewater from the first projection from flowing back into the side branch pipe. The height position of the lower end 1340D of this start-side backflow prevention rib (fourth backflow prevention rib 1340) is characterized in that it approximately coincides with the upper end 1200U (starting point) of the first projection (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 approximately coincides with the height position of the upper end 1200U (starting point) of the deflection plate 1200, which is advantageous in that it is possible to prevent backflow from the deflection plate 1200 to the horizontal branch pipe and also makes it easier to form a swirling flow.

[0032] In this way, the drainage collector pipe 1000 in this embodiment is equipped with four backflow prevention ribs, each having a shape parallel to the axis: a first backflow prevention rib 1310 and a second backflow prevention rib 1320 for preventing wastewater flowing from the side branch pipe into the drainage collector pipe 1000 from flowing back into the adjacent side branch pipe, and an end-side backflow prevention rib (third backflow prevention rib 1330) and a start-side backflow prevention rib (fourth backflow prevention rib 1340) for preventing wastewater splashing from the first protrusion (deflection plate 1200) from flowing back into the side 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 collecting pipe 1000, but at least the end-side backflow prevention rib (third backflow prevention rib 1330) is provided next to the first protrusion (deflection plate 1200) and at a position separated from the inner circumference (inner wall) of the upper pipe 1100. Also, 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 start-side backflow prevention rib (fourth backflow prevention rib 1340)).

[0033] In addition to the above, the following cases are also possible: The lower end of the third backflow prevention rib 1330 (end-point side backflow prevention rib) is located 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 (end-point side backflow prevention rib) may be located at the same height as long as they are lower than the pipe bottom of the horizontal branch pipe connecting portion 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 at which the first protrusion (deflection plate 1200) is provided, and therefore may not be located below the pipe bottom of the horizontal branch pipe connection portion 1120. The height relationship of the lower ends of these four backflow prevention ribs is, in descending order, the fourth backflow prevention rib 1340 (starting point side backflow prevention rib), the first backflow prevention rib 1310 = the second backflow prevention rib 1320, and the third backflow prevention rib 1330 (end point side backflow prevention rib). However, since 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 of the first protrusion (deflection plate 1200), if the height position of the first protrusion (deflection plate 1200) is lowered, the height of the lower end 1340D of the fourth backflow prevention rib 1340 (starting point side backflow prevention rib) will also be lowered, and depending on the height position of the first protrusion (deflection plate 1200), the lower end 1340D of the fourth backflow prevention rib 1340 (starting point side backflow prevention rib) may be located at the lowest position among the lower ends of the four backflow prevention ribs.

[0034] Here, the outer layer material (outer layer cover) 1700 wrapped around the drainage collecting pipe 1000 will be described with reference to FIGS. 2 to 4. This outer layer material 1700 corresponds to the outer layer member 700 disclosed in, for example, JP 2021-167557 A filed by the applicant of the present application (however, the shape and position of the thermally expandable fireproof material are different). When this drainage collecting pipe 1000 burns, the thermally expandable fireproof material 1712 expands radially inward due to the heat, and the resin drainage collecting pipe 1000 crushes its hollow portion to block the drainage collecting pipe 1000. As a result, the drainage piping structure using these drainage collecting pipes 1000 can block the pipe so that flames, smoke, etc. do not flow in the event of a fire.

[0035] As shown in FIGS. 2 to 4, the outer layer material 1700 has a three-layer structure. From the outer surface of the drainage collecting pipe 1000, a vibration damping material 1714 (or a thermally expandable fire-resistant material 1712), a vibration insulator 1720 made of fire-resistant inorganic fiber, and a sound-proof cover 1730 are provided in this order on the outer peripheral surface of the upper pipe 1100 and / or the lower pipe 1500 of the drainage collecting pipe 1000.

[0036] Thus, the innermost layer 1710 in this three-layer structure is either the thermally expandable fire-resistant material 1712 or the vibration-damping material 1714. As shown in Fig. 5(B), the thermally expandable fire-resistant material 1712 (fire-resistant sheet, fire-resistant tape) is preferably located at a height position above the upper end 1500U of the lower pipe 1500 and below the upper end 1700U of the outer layer material 1700 (the upper end of the sound-insulating cover 1730). Note that Fig. 5(B) is Fig. 5(A) with the outer layer material 1700 added. Here, since a tape- or sheet-like heat-expandable fire-resistant material 1712 is provided on the outer peripheral surface of the upper pipe 1100 of the drainage collection pipe 1000 as the innermost layer 1710, this is advantageous in that it avoids the outer diameter of the pipe, including the outer layer material 1700, from becoming larger (compared to the case where it is provided on the outer peripheral surface of the lower pipe 1500 at the part fitted onto the lower end of the upper pipe 1100, for example). Also, from the viewpoint of rapid blocking of the pipe in the event of a fire, it is preferable that the height position of the lower end 1200D of the first projection (deflection plate 1200) is higher than the upper end of the heat-expandable fire-resistant material 1712 (i.e., the first projection (deflection plate 1200) and the heat-expandable fire-resistant material 1712 do not overlap in the height direction). However, as described above, there are cases where the height position of the first projection (deflection plate 1200) is lower, in which case the height position of the lower end 1200D of the first projection (deflection plate 1200) may be lower than the upper end of the heat-expandable fire-resistant material 1712 (i.e., the first projection (deflection plate 1200) and the heat-expandable fire-resistant material 1712 overlap in the height direction). The heat-expandable fire-resistant material 1712 may be in a putty form.

[0037] The vibration-damping material 1714 is formed containing a butyl-based (butyl rubber, etc.) or asphalt-based (rubber asphalt, modified asphalt, etc.) material, the sound-proofing cover 1730 is formed containing a rubber-based (EPDM (ethylene propylene diene rubber) etc.), elastomer-based or resin-based material (it can be made of not only soft materials such as rubber but also hard PVC), and the vibration insulator 1720 formed from fire-resistant inorganic fibers consists of an aggregate of fire-resistant inorganic fibers (porous material).

[0038] Here, examples of inorganic fibers include artificial mineral fibers, such as glass wool, rock wool, or ceramic fiber, which are preferred for their high vibration insulation and sound absorption performance. The vibrations (e.g., noises and vibrations generated by hitting the deflector 1200 or the swirl vane 1600) caused by the wastewater flowing down the upper pipe 1100 or the lower pipe 1500 of the wastewater collecting pipe 1000 are suppressed by the vibration-damping material 1714, and the vibrations are further blocked (and / or the noises caused by the vibrations are absorbed) by the vibration insulator 1720 made of the rock wool or the like, and the transmission of the noises caused by the vibrations is further blocked by the sound-insulating cover 1730 made of a rubber cover made of EPDM or the like. Here, rock wool is a general term for materials manufactured using natural rocks or steel slag such as blast furnace slag as the main raw material, and glass wool is a general term for cotton-like materials made of glass fibers, both of which have fire resistance and flame retardancy.

[0039] In the following, a case where butyl rubber is used as the vibration-damping material 1714, rock wool is used as the vibration insulator 1720, and an EPDM rubber cover is used as the sound-insulating cover 1730 may be described, but these materials are merely examples. In addition, it is preferable that the outer layer material 1700 (innermost layer: heat-expandable fireproof material 1712 or vibration-damping material 1714, middle layer: vibration insulator 1720, outermost layer: sound-insulating cover 1730) abuts against the outer surface of the drainage collecting pipe 1000 via a ring-shaped elastic material (rubber ring 1900) (made of EPDM or the like) that is elastic and corresponds to the outer diameter of the drainage collecting pipe 1000 (more specifically, the outer diameter of the body part that is the straight pipe part below the horizontal branch pipe connection part 1120 of the upper pipe 1100) in order to ensure water-stopping properties. In order to ensure water-stopping properties, a packing structure may be adopted instead of the ring elastic material (rubber ring 1900). Furthermore, in the case where the outer layer material 1700 is adhesively bonded to the outer surface of the drainage collecting pipe 1000 via the rubber ring 1900, until a time period during which adhesive bonding performance can be ensured has elapsed, the rubber ring 1900 and the outer layer material 1700 may be removed from the drainage collecting pipe 1000 by using, for example, a heat shrink tube 1910 as shown in FIG. 4 and FIG. 10(B). It is also preferable to prevent the positions of from shifting. In order to improve the efficiency of the assembly process, sound insulating cover 1730 and rubber ring 1900 of outer layer material 1700 are separate members (even though they are made of the same material).

[0040] From here, the positional relationship between the first protrusion (deflection plate 1200) and the second protrusion (swirl vane 1600) (the positional relationship when looking at the inside of the drainage collecting pipe 1000 from the upper riser pipe connection part 1110 in a direction parallel to the axis of the drainage collecting pipe 1000 (= vertical pipe axis of upper pipe 1100 = vertical pipe axis of lower pipe 1500)) will be explained in detail with reference to Figures 6 to 8.

[0041] When the inside of the drainage collecting pipe 1000 is viewed in a direction parallel to the axis from the upper riser pipe connection part 1110 (as seen in FIG. 1), the first protrusion (deflection plate 1200) and the second protrusion (swirl vane 1600) do not overlap. As seen in FIG. 1, since the deflection plate 1200 and the swirl vane 1600 do not overlap, the swirling flow induced by the deflection plate 1200 is taken over by the swirl vane 1600 as shown by the white arrow in FIG. 2, and the swirl component of the swirl flow is further increased by the swirl vane 1600, which exerts an effect of the action.

[0042] Such conditions will be further explained below. As shown in Fig. 6, the positional relationship when the first projection (deflection plate 1200) and the second projection (swirl vane 1600) are closest to each other around the axis is when the lower end 1200D of the first projection (deflection plate 1200) and the upper end 1600U of the second projection (swirl vane 1600) do not overlap when looking from the upper riser pipe connection part 1110 into the inside of the drainage collecting pipe 1000 in a direction parallel to the axis (as seen in Fig. 1).

[0043] Furthermore, as shown in FIG. 7, the positional relationship when the first protrusion (deflection plate 1200) and the second protrusion (swirl vane 1600) are furthest apart around the axis is when the drainage collector pipe 1000 is cut by the planar surface 1200P that forms the first protrusion (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 protrusion (swirl vane 1600).

[0044] As shown when the first protrusion (deflection plate 1200) and the second protrusion (swirl vane 1600) are closest to each other (θ=102 deg shown in FIG. 6) and when they are furthest apart (θ=168 deg shown in FIG. 7), a first straight line (straight line A) is formed by connecting a first midpoint 1200M of a straight line connecting an upper end 1200U, which is the starting point of the first protrusion (deflection plate 1200), to a lower end 1200D, which is the end point, of the first protrusion (deflection plate 1200) when viewed from the side, in a plane that includes the first midpoint 1200M and is perpendicular to the axis, and a second protrusion (swirl vane 1600) 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. When a second straight line (straight line B) connecting the second midpoint 1600M of a line connecting the upper end 1600U, which is the starting point, and the lower end 1600D, which is the end point, of (the swirl vane 1600), is projected onto the axis in a plane that includes the second midpoint 1600M and is perpendicular to the axis, the intersection angle θ between the projected first straight line (straight line A) and the second straight line (straight line B) is in the range of 100 deg≦θ≦170 deg (preferably 102 deg≦θ≦168 deg) in the direction of the swirling flow generated in the drainage manifold 1000 (here, the counterclockwise direction when viewed from above) with respect to the first straight line (straight line A).

[0045] When the first protrusion (deflection plate 1200) and the second protrusion (swirl vane 1600) are closest to each other, as shown in Figure 6, when looking from the upper riser pipe connection part 1110 into the inside of the drainage collecting pipe 1000 in a direction parallel to the axis (as seen in Figure 1), the lower end 1200D of the first protrusion deflection plate 1200 does not overlap with the upper end 1600U of the second protrusion (swirl vane 1600), and if this is expressed as the (narrower) intersection angle θ between line A and line B, θ is 100 degrees or more (preferably 102 degrees or more). In addition, the figure shown in Figure 6(E) is a cross-sectional view indicated by the straight line 6E-6E shown in Figure 6(D) and the arrow attached to that line, and this straight line 6E-6E is a straight line passing through the axis of the drainage manifold 1000, passing through the upper end 1600U which is the starting point of the swirl vane 1600, and intersecting perpendicularly with the line indicating the upper end of the swirl vane 1600.

[0046] When the first projection (deflection plate 1200) and the second projection (swirl vane 1600) are farthest apart, as shown in FIG. 7, the surface 1200P forming the first projection (deflection plate 1200) When the drainage collecting pipe 1000 is cut, the lower end 1200PD in the cut surface including the surface 1200P is located at the upper end 1600U which is the starting point of the second projection (swirl vane 1600), and when this is expressed as the (narrower) intersection angle θ between the lines A and B, θ is 170 degrees or less (preferably 168 degrees or less). Note that the diagram shown in Fig. 7(C) is a diagram in which the lower end 1200PD in the cut surface including the surface 1200P which forms the first projection (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 drainage collecting pipe 1000.

[0047] The (narrower) intersection angle θ between lines A and B is 100 deg≦θ≦170 deg (preferably 102 deg≦θ≦168 deg). When the intersection angle θ between lines A and B is within this range, the swirling flow induced by deflector plate 1200 is carried over to swirl vane 1600 as shown by the outlined arrow in Fig. 2, and the swirling vane 1600 exerts an effect of further increasing the swirling component of the swirling flow.

[0048] Fig. 8 shows the positional relationship between the deflector plate 1200 and the swirl vane 1600 when θ=132° (note that Fig. 1 also shows the case when θ=132°). Fig. 8(B) shows the 8B-8B cross section shown in the top view of Fig. 8(A), Fig. 8(C) shows the 8C-8C cross section shown in the top view of Fig. 8(A), and Fig. 8(D) shows the 8D-8D cross section shown in the top view of Fig. 8(A), which are arbitrary cross sections of the drainage collecting pipe 1000 (θ=132°) that can simultaneously show the deflector plate 1200 and the swirl vane 1600.

[0049] Here, in addition to being made of resin as described above, the drainage collecting pipe 1000 has the following characteristics: The upper pipe 1100 of the drainage collecting pipe 1000 is integrally molded including the first protrusion (deflection plate 1200), and the lower pipe 1500 is integrally molded including the second protrusion (swirl vane 1600), and the drainage collecting pipe 1000 is characterized by being composed of two members, the upper pipe 1100 and the lower pipe 1500.

[0050] Furthermore, in place of the above-mentioned features, the upper pipe 1100 of the drainage collecting pipe 1000 is integrally molded including a first protrusion (deflection plate 1200) and a backflow prevention rib having a shape parallel to the axis to prevent drainage from flowing back into the horizontal branch pipe (more specifically, the first backflow prevention rib 1310, the second backflow prevention rib 1320, the end point side backflow prevention rib (third backflow prevention rib 1330) and the start point side backflow prevention rib (fourth backflow prevention rib 1340), and the lower pipe 1500 is integrally molded including the second protrusion (swirl vane 1600), and the drainage collecting pipe 1000 is composed of two components, the upper pipe 1100 and the lower pipe 1500.

[0051] By constructing the drainage collecting pipe 1000 using these two components, it is possible to avoid increasing the number of parts or providing a complex structure, and the drainage flowing down from the upper floors is received by swirling vanes (also called baffles) and turned into a swirling flow along the inner wall surface of the riser pipe, and a ventilating core is always provided within the riser pipe, thereby reducing pressure fluctuations due to blockages within the riser pipe and preventing the sealing of water in sanitary equipment, etc. on each floor from being broken due to pressure fluctuations.

[0052] The upper pipe 1100 of this drainage collecting pipe 1000 has a protrusion (corresponding to the above-mentioned first protrusion (deflection plate 1200)) protruding on the inner circumference in order to change the flow of drainage in a direction (here, the 9 o'clock direction) in which the horizontal branch pipe connecting portion 1120 is not provided. More specifically, this first protrusion is a deflection plate 1200 having a flat surface 1200P, as shown in Figs. 3, 9 and 10, the upper pipe 1100 of the drainage collecting pipe 1000 has a recess for forming the protrusion (deflection plate 1200) on the outer circumferential surface of the upper pipe 1100 on which the protrusion (deflection plate 1200) is provided.

[0053] Here, although not limited thereto, as described above, the vertical pipe axis of the upper pipe 1100 and the vertical pipe axis of the lower pipe 1500 coincide to form the axis of the drainage collecting pipe 1000, and the recess can be provided with a rib 1400 including a surface perpendicular to this axis. Here, the recess is an essential component, but the rib 1400 is an optional component, and it is also possible to only provide a recess for forming a protrusion (drift plate 1200) on the outer circumferential surface of the upper pipe 1100 without providing the rib 1400. As will be described in detail later, the rib 1400 includes a plurality (four in this case) of body uniform diameter ribs 1410 and a (single) rubber ring positioning rib 1412 at the bottom stage, which has a different protruding length (length t shown in FIG. 10(B)) from these body uniform diameter ribs 1410. The outer diameter of the body equal diameter rib 1410 is approximately the same as the outer diameter of the body (= body diameter), the body being the straight pipe portion immediately below the horizontal branch pipe connecting portion 1120 in the upper pipe 1100, and the body diameter means the outer diameter of this portion.

[0054] Here, this recess (with or without a rib) can have the function of reducing vibration or noise generated when wastewater hits the protrusion (deflection plate 1200).

[0055] Here, the effect of reducing vibration or noise generated when wastewater hits the protrusion (deflection plate 1200) can be achieved by air remaining in the recess (whether or not there is a rib) (if ribs 1400 are provided, air remaining in the space 1410S formed between the ribs 1400).

[0056] Here, the effect of reducing vibration or noise caused by wastewater hitting the protrusion (deflection plate 1200) can be achieved by a member covering the drainage collecting pipe 1000 including the recess (with or without ribs) or a member fitted into the recess (with or without ribs). Also, although not limited thereto, the effect of reducing vibration or noise caused by wastewater hitting the protrusion (deflection plate 1200) can be achieved by providing a cover material (more preferably a cover material with vibration damping and / or sound insulation performance) that seals air stagnating in a recess without ribs, or a cover material (more preferably a cover material with vibration damping and / or sound insulation performance) that seals air stagnating in the space 1410S formed between the ribs 1400. In addition, by providing a material with vibration-damping and / or sound-proofing properties in a recess where there is no rib, or by providing a material with vibration-damping and / or sound-proofing properties in the space 1410S formed between the ribs 1400, it is possible to achieve the effect of reducing vibrations or noise generated when wastewater hits the protrusion (deflection plate 1200).

[0057] Also, although not limited thereto, in the case where the recess has ribs 1400, multiple ribs 1400 (here, five) are provided between the upper surface and the lower surface of the horizontal branch pipe connection portion 1120, and the outer diameter of the lowest rib (rubber ring positioning rib 1412) can be made different from the outer diameter of the normal ribs (body equal diameter rib 1410) other than the lowest rib.

[0058] In this case, it is preferable that the outer diameter of the normal rib (same diameter body rib 1410) is approximately the same as the outer diameter (= body diameter) of the body part below the horizontal branch pipe connecting part 1120 in the upper pipe 1100. In this way, the outer diameter of the multiple (four here) normal ribs (same diameter body ribs 1410) is approximately the same as the outer diameter (= body diameter) of the body part below the horizontal branch pipe connecting part 1120 in the upper pipe 1100, so that when an upper pipe cover having an Ω-shaped hole or the like with a maximum diameter approximately the same as or slightly larger than the outer diameter of the horizontal branch pipe connecting part 1120 in three directions (three directions other than the 9 o'clock direction) is put on, the normal rib (same diameter body rib 1410) has the same outer diameter in the 9 o'clock direction as in the other three directions, so that the workability of wrapping the upper pipe cover around the upper pipe 1100 is improved, which is preferable.

[0059] 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 horizontal branch pipe connection portion 1120 in the upper pipe 1100 (i.e., larger than the body equal diameter rib 1410). In this case, as described above with reference to JP 2021-167557 A, when an outer layer member (here, an outer layer material 1700 composed of three layers) is provided on the drainage collecting pipe 1000 via a rubber ring 1900 provided on the body portion, it is more preferable to adopt the following embodiment. 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 portion 1120, and the outer diameter of the lowest rib (rubber ring positioning rib 1412) is preferably greater than the outer diameter of the body portion by the thickness of the rubber ring 1900 and protrudes to the outer periphery.

[0060] That is, the normal ribs (body equal diameter rib 1410) other than the lowest rib (rubber ring positioning rib 1412) have an outer diameter that is approximately the same as the outer diameter of the body, so that when the upper tube cover is placed on the upper tube 1100, the presence of this normal rib (body equal diameter rib 1410) makes the outer diameter in the 9 o'clock direction the same as in the other three directions, which is preferable in that it improves the workability of wrapping the upper tube cover around the upper tube 1100. Also, the lowest rib (rubber ring positioning rib 1412), the rib outer diameter ≠ body outer diameter (rib outer diameter > body outer diameter), the lower protrusion amount t of the rubber ring positioning rib 1412 is greater than the thickness of the rubber ring 1900 (e.g., 5 mm) (rubber ring positioning rib 1412 outer diameter > 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 portion 1120. Therefore, as shown in Figure 10 (B), when setting the rubber ring 1900 on the upper pipe 1100 of the drainage collection pipe 1000, the rubber ring 1900 can be easily positioned with respect to the upper pipe 1100 of the drainage collection pipe 1000 by simply abutting the upper end surface 1900U of the rubber ring 1900 against the underside of the rubber ring positioning rib 1412 which protrudes toward the outer periphery by the protrusion amount t of the rubber ring positioning rib 1412, which is preferable in that it improves the workability of attaching the outer layer material 1700 to the drainage collection pipe 1000.

[0061] Next, the upper pipe 1100 and the lower pipe 1500 of the drainage collecting pipe 1000 are both integrally molded from resin, and therefore the provision of a draft angle required for this will be described with reference to Figs. 11 to 14, taking the upper pipe 1100 as an example. As described above, the upper pipe 1100 of the drainage collecting pipe 1000 is integrally molded including the first protrusion (deflection plate 1200) and the backflow prevention rib (more specifically, the first backflow prevention rib 1310, the second backflow prevention rib 1320, the end point side backflow prevention rib (the third backflow prevention rib 1330), and the start point side backflow prevention rib (the fourth backflow prevention rib 1340)) having a shape parallel to the axis to prevent the drainage from flowing back into the horizontal branch pipe. 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.

[0062] More specifically, the solid black line portion (the portion visible in the top view) in the top views shown in Figures 11(B) and 13(B) needs to have a draft angle that increases the dimensions as it goes up (toward the front of the page) in the manufacturing process of one-piece molding, and the solid black line portion (the portion visible in the bottom view) in the bottom view shown in Figure 12(B) needs to have a draft angle that increases the dimensions as it goes down (toward the front of the page) in the manufacturing process of one-piece molding. 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 indicate hidden lines, but are drawn as dotted lines to emphasize the parts that require the draft angle indicated by the solid black lines. Note that the top views shown in Figures 11(B) and 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 and the presence or absence of a horizontal branch pipe receiving port 1122, etc.) are different.

[0063] As an example, as shown in FIG. 14, the upper pipe 1100 of the drainage collecting pipe 1000 is basically molded by using a mold body (here, a first mold 2010 and a second mold 2020) to form the outer shape, and by using slide cores (here, a first slide core 2110, a second slide core 2120, and a third slide core 2130) from each direction to form the inner shape. The third slide cores 2130 are required in the number of the horizontal branch pipe connecting parts 1120 (here, three pieces) (only one piece is shown in FIG. 14). In such resin molding, the molding is performed so as not to form an undercut, and a draft angle is provided in the molded product in order to remove the molded product from the mold and slide core after molding. Also, as shown in FIG. 14, the first internal protrusion (deflection plate 1200) and four backflow prevention ribs are molded by overlapping the slide cores. The slide core is provided with a draft angle as shown in FIG. 14, and a molding having a draft angle corresponding to this draft angle is molded and removed from the slide core.

[0064] The first protrusion (drift plate 1200) in the upper pipe 1100 integrally molded in this manner is integrally molded with two types of reinforcing ribs, as shown in Fig. 15. Two first reinforcing ribs 1210 parallel to a vertical plane including the pipe axis of the horizontal branch pipe in 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, planar drift plate 1200, so that the drift plate 1200 is not damaged by the wastewater flowing down from the upper floor, and the drift plate 1200 can impart a swirling component to the wastewater flowing down from the upper floor to induce a swirling flow (as described above, the swirling flow induced by the drift plate 1200 is taken over to the swirl vanes 1600, and the swirling component is further increased in the swirling flow).

[0065] <First Modification> A first modified example of the drainage collecting pipe according to the present embodiment will be described with reference to FIG. 16. The lower pipe 1500 of the drainage collecting pipe 1000 shown in FIG. 16(A) (described above) has a socket (lower pipe socket) 1520 for connecting the upper pipe 1100 and the lower pipe 1500 by fitting the lower end of the upper pipe 1100 onto it, but the drainage collecting pipe 1001 according to this modified example shown in FIG. 16(B) to FIG. 16(E) does not have this lower pipe socket. As shown in FIG. 16(B) to FIG. 16(E), the drainage collecting pipe 1001 according to this modified example is composed of a lower pipe 1501 that does not have a lower pipe socket and an upper pipe 1101 (basically the same as the upper pipe 1100). In the drainage collecting pipe 1001 according to this modified example, a socket 1502 is used to connect the upper pipe 1101 and the lower pipe 1501. Here, it is preferable that the outer and inner diameters at the lower end of the upper tube 1101 are the same as the outer and inner diameters at the upper end of the lower tube 1501. Such a socket 1502 is fitted onto the lower end of the upper tube 1101 and the upper end of the lower tube 1501 to join the upper tube 1101 and the lower tube 1501. More specifically, the lower end of the upper tube 1101 is adhesively joined to one side of the socket 1502, and the upper end of the lower tube 1501 is adhesively joined to the other side of the socket 1502 to join the upper tube 1101 and the lower tube 1501. By dividing the connection parts in this way (dividing the lower pipe, which had an integrated lower pipe socket, into a socket separate from the lower pipe and a lower pipe without a lower pipe socket), it becomes possible to change the material of just that part (here, the socket, which is the connection part), and for example, it is possible to use a transparent material for the connection part so that the connection can be visually confirmed, or to increase the strength of just the connection part compared to the other parts (upper pipe, lower pipe, etc.) to increase the reliability of the joint. By using such a structure, it is possible to stabilize quality without having a complex structure.

[0066] <Second Modification> A second modified example of the drainage collecting pipe according to the present embodiment will be described with reference to FIG. 17. The drainage collecting pipe 1000 described above is wrapped with an outer layer material (outer layer cover) 1700 having a three-layer structure. As described above, the sound-insulating cover 1730 is provided as the outermost layer of this outer layer cover 1700. This sound-insulating cover 1730 is an integral body having a straight portion that is mainly wrapped around the upper pipe 1100 and a tapered portion that is mainly wrapped around the lower pipe 1500. As shown in FIG. 17(A), the sound-insulating cover 1731 according to this modified example is composed of two structures: a straight portion 1731U that is mainly wrapped around the upper pipe 1100, and a tapered portion 1731D that is mainly wrapped around the lower pipe 1500. As for the material, as described above, it is formed by including a rubber-based (EPDM (ethylene propylene diene rubber) or the like), an elastomer-based, or a resin-based material, and may be made of not only soft materials such as rubber but also hard PVC.

[0067] In this modification, the vibration insulator 1721 formed of the fire-resistant inorganic fiber (rock wool as an example) in the middle layer of the outer layer material (outer layer cover) 1700 of a three-layer structure is bent from the flat shape shown in the development view in the lower diagram of Fig. 17(B) so that the left and right ends are in contact as shown by the dashed line, and is a three-dimensional vibration insulator 1721 having a straight portion and a tapered portion as shown in the upper diagram of Fig. 17(B). As shown in Fig. 17(C), the straight portion of this three-dimensional vibration insulator 1721 is covered with the straight portion 1731U of the sound insulation cover 1731, and as shown in Fig. 17(D), the portion of the vibration insulator 1721 corresponding to the straight portion 1731U of the sound insulation cover 1731 (approximately the upper half) is covered by the sound insulation cover, and the portion of the vibration insulator 1721 corresponding to the tapered portion 1731D of the sound insulation cover 1731 (approximately the lower half) is exposed. Next, as shown in FIG. 17(E), the tapered portion of the vibration insulator 1721 is covered with the tapered portion 1731D of the sound insulating cover 1731, and the entire vibration insulator 1721 is covered by the straight portion 1731U and tapered portion 1731D of the sound insulating cover 1731, as shown in FIG. 17(F).

[0068] In the state shown in FIG. 17(F), ALCG tape 1733 (aluminum glass cloth tape, a base material made of aluminum foil and glass cloth bonded together, with adhesive applied on one side of the base material) is wound around the straight portion 1731U and the tapered portion 1731D of the sound insulating cover 1731. The outer layer material (outer cover) (here, two-layer structure) is completed by assembling the two-layer structure outer layer material (outer cover) to a drainage collecting pipe equipped with an innermost layer 1710 (thermally expandable fire-resistant material 1712 and vibration-damping material 1714), or the innermost layer 1710 (thermally expandable fire-resistant material 1712 and vibration-damping material 1714) is attached to the two-layer structure outer layer material (outer cover) and then assembled to the drainage collecting pipe, completing the assembly of the drainage collecting pipe. By dividing the sound insulation cover into two parts, upper and lower, in this way, the undercut shape of the sound insulation cover can be eliminated, and the assembly work with the vibration insulator (rock wool) can be facilitated. By adopting such a structure, it is possible to stabilize the quality without providing a complicated structure.

[0069] <Third modified example> A third modified example of the drainage collecting pipe according to the present embodiment will be described with reference to Fig. 18. First, a drainage collecting pipe 1002 shown in Fig. 18(A) will be described. This drainage collecting pipe 1002 is a drainage collecting pipe that is mainly suitable for use on the lowest floor, and the upper pipe is the same as the upper pipe 1100 described above, and the lower pipe does not have a swirl vane but has a reduced diameter section. In contrast, a drainage collecting pipe 1003 according to this modified example shown in Figs. 18(B) to 18(D) is the same as the drainage collecting pipe 1002 in that it is mainly suitable for use on the lowest floor and that the lower pipe does not have a swirl vane, but is different from the drainage collecting pipe 1002 in that the lower pipe does not have a reduced diameter section and the lower pipe socket described in the first modified example described above. As shown in Fig. 18(B) to Fig. 18(D), this drainage collecting pipe 1003 is composed of an upper pipe 1101 (basically the same as the upper pipe 1100), an increaser 1505 (sometimes called a different diameter socket or a different diameter socket), and a VU pipe 1503 (a straight pipe of hard polyvinyl chloride). For example, a pipe with a nominal diameter of 150 x 125 is used as the increaser 1505, and a pipe with a nominal diameter of 125 is used as the VU pipe 1503. By dividing the lower pipe suitable for use on the lowest floor in this way (dividing the lower pipe, which had the lower pipe socket and the reduced diameter part integrated into an increaser and a straight pipe), it becomes possible to change the material of only that part (here, the increaser, which is a connecting part). For example, a transparent material can be used for the connecting part so that the connecting part can be visually confirmed, or the reliability of the joint can be improved by increasing the strength of only the connecting part more than the other parts (upper pipe, lower pipe, etc.). By adopting such a structure, it is possible to stabilize the quality without a complex structure. Note that, in this modification, a lower pipe having a reduced diameter portion but no lower pipe socket may be adopted, and the socket described in the first modification may be used in place of the lower pipe socket.

[0070] <Fourth modified example> A fourth modified example of the drainage collecting pipe according to the present embodiment will be described with reference to Fig. 19. Fig. 19(A) is a top view of the drainage collecting pipe 1004 according to this modified example, and Fig. 19(B) is a cross-sectional view of 19B-19B shown in Fig. 19(A). In addition, in the drainage collecting pipe 1004 shown in Fig. 19(A) and Fig. 19(B), an upper riser pipe 1111 is connected to an upper riser pipe connection part 1110 via a riser pipe socket 1112 and a rubber ring 1114, and a side branch pipe 1121(0) at the 0 o'clock direction, a side branch pipe 1121(3) at the 3 o'clock direction, and a side branch pipe 1121(6) at the 6 o'clock direction are connected to a side branch pipe connection part 1120 via a side branch pipe socket 1122 and a rubber ring 1124, respectively. The top view of the drainage collector pipe 1004 shown in Figure 19 (A) shows the external shape of the drainage collector pipe 1004 to which the upper pipe 1111 and two horizontal branch pipes 1121 are connected, and is a view looking in a direction parallel to the axis of the drainage collector pipe 1004 as if looking into the inside of the internal drainage collector pipe 1004 from the upper pipe 1111.

[0071] 19(B) is a side cross-sectional view corresponding to FIG. 2 described above, but the drainage collecting pipe 1004 shown in FIG. 19 and the drainage collecting pipe 1000 shown in FIG. 2 are characterized in that the height position of the first projection (deflection plate 1204) provided on the upper pipe 1104 of the drainage collecting pipe 1004 is lower than the height position of the first projection (deflection plate 1200) provided on the upper pipe 1100 of the drainage collecting pipe 1000. More specifically, as shown in FIG. 19(B), the height position of the upper end, which is the starting point of the first projection (deflection plate 1204) provided on the upper pipe 1104 of the drainage collecting pipe 1004, is located lower than the pipe axis of the horizontal branch pipe connection part 1120 (even lower than the height position of the upper end, which is the starting point of the first projection (deflection plate 1200)). As a result, all of the horizontal branches (here, at the 0 o'clock, 3 o'clock and 6 o'clock directions) The pipe connection portion 1120 is provided at a position facing the upper surface of the first projection (deflection plate 1204).

[0072] In addition, here, the fact that all of the horizontal branch pipe connecting parts 1120 are provided at positions facing the upper surface of the first protrusion (deflection plate 1204) means that the height position of the upper end, which is the starting point of the first protrusion (deflection plate 1204), is (1) Basically, it is below the pipe axis of the horizontal branch pipe connection part 1120. (2) Even if it is below the axis of the horizontal branch pipe 1121 (3) Even if the horizontal branch pipe connection part 1120 is below or at the same height as the pipe bottom In at least the cases of (1) to (3), all of the side branch pipe connecting parts 1120 are provided at positions facing the upper surface of the first projection (deflection plate 1204). However, in the case of (2), the height position of the pipe axis of the side branch pipe 1121 changes depending on the difference in the pipe diameter of the side branch pipe 1121 connected to this drainage collecting pipe 1004. For example, as shown in FIG. 19(B), the height position of the side branch pipe 1121(6) at the 6 o'clock position, which has a smaller pipe diameter, is lower than the height position of the side branch pipe 1121(0) at the 0 o'clock position, which has a larger pipe diameter. However, in the case of (2), all of the side branch pipe connecting parts 1120 are provided at positions facing the upper surface of the first projection (deflection plate 1204). Furthermore, even if (1) to (3) are satisfied, for example, if the height position of the upper end, which is the starting point of the first protrusion (deflection plate 1204), is located at a height position significantly below the pipe bottom of the horizontal branch pipe connecting part 1120, there may be a gap in the height direction between the pipe bottom of the horizontal branch pipe connecting part 1120 and the upper end, which is the starting point of the first protrusion (deflection plate 1204). In this case, if the wastewater discharged from all the horizontal branch pipe connecting parts 1120 enters the gap, it may not be possible to efficiently guide the wastewater to the second protrusion (swirl vane 1600) without hitting the upper surface of the first protrusion (deflection plate 1204), which may be undesirable.

[0073] Since the height position of the upper end, which is the starting point of the first projection (deflection plate 1204), is located below the pipe axis of the horizontal branch pipe connecting part 1120 and all the horizontal branch pipe connecting parts 1120 are provided in positions facing the upper surface of the first projection (deflection plate 1204), the wastewater discharged from the horizontal branch pipe 1121 via all the horizontal branch pipe connecting parts 1120 hits (always or most of) the upper surface of the first projection (deflection plate 1204) as shown by the white arrow in Figure 19 (B), and the wastewater can be efficiently guided to the second projection (swirl vane 1600). This ensures an air passage in the drainage collecting pipe 1004, and sufficient drainage capacity can be exhibited. The white arrows in Figure 19(B) indicate the drainage from the side branch pipe 1121(0) in the 0 o'clock direction and the drainage from the side branch pipe 1121(6) in the 6 o'clock direction. Although not shown by the white arrows, the drainage from the side branch pipe 1121(3) in the 3 o'clock direction can also be efficiently guided to the second protrusion (swirl vane 1600) by hitting the upper surface of the first protrusion (deflector plate 1204), just like the other drainage from the 0 o'clock and 6 o'clock directions.

[0074] <Fifth modified example> A fifth modified example of the drainage collecting pipe according to the present embodiment will be described with reference to Fig. 20. Fig. 20(A) is a top view of the drainage collecting pipe 1005 according to this modified example, Fig. 20(B) is a cross-sectional view taken along line 20B-20B in Fig. 20(A), and Fig. 20(C) is a cross-sectional view taken along line 20C-20C in Fig. 20(A). Fig. 20 does not show the upper riser pipe 1111 and the side branch pipe 1121 shown in Fig. 19.

[0075] 20(A) and 20(B) are top views and side cross-sectional views corresponding to the above-mentioned Fig. 19(A) and Fig. 19(B), and Fig. 20(C) is a side cross-sectional view corresponding to Fig. 3 (however, Fig. 20(C) and Fig. 3 are reversed). The drainage collecting pipe 1005 shown in Fig. 20 and the drainage collecting pipe 1004 shown in Fig. 19 are characterized in that the shape of the first protrusion (drift plate 1205) provided on the upper pipe 1105 of the drainage collecting pipe 1005 is different from the shape of the first protrusion (drift plate 1204) provided on the upper pipe 1104 of the drainage collecting pipe 1004 (and also from the shape of the first protrusion (drift plate 1200) provided on the upper pipe 1100 of the drainage collecting pipe 1000 shown in Fig. 2, which has the same shape but a different height position from Fig. 19).

[0076] The difference in shape will now be described in detail. As shown in FIG. 20(B) and FIG. 20(C), the first protrusion (drift plate 1205) of the upper pipe 1105 of the drainage collecting pipe 1005 is, In the front view shown in Figure 20(B), it has an approximately semicircular shape (inverted U-shape) with the center of the circle facing downward, and in the side view shown in Figure 20(C), it has an approximately quarter-circular shape with the center of the circle facing the pipe wall side opposite the axis side of the upper pipe 1105, and has a so-called eaves shape.

[0077] In addition, there is no difference in height position between the drainage collector pipe 1005 shown in Figure 20 and the drainage collector pipe 1004 shown in Figure 19. Since the height position of the upper end, which is the starting point of the first protrusion (deflection plate 1204, deflection plate 1205), is located below the pipe axis of the horizontal branch pipe connection part 1120, all of the horizontal branch pipe connection parts 1120 are located in a position facing the upper surface of the first protrusion (deflection plate 1204, deflection plate 1205). Therefore, the wastewater discharged from the horizontal branch pipe through all the horizontal branch pipe connection parts 1120 hits (always or for the most part) the upper surface of the first protrusion (deflection plate 1204, deflection plate 1205), and can be efficiently guided to the second protrusion (swirl vane 1600). As a result, an air passage is secured within the drainage collector pipe 1004, and sufficient drainage capacity can be exhibited. In the same manner, In this manner, the height position of the upper end, which is the starting point of the first protrusion (deflection plate 1200, deflection plate 1204, deflection plate 1205), is located below the pipe axis of the horizontal branch pipe connection portion 1120, and this applies whether the drainage collector pipe is for an ultra-high rise, high rise, or mid-rise building (i.e., regardless of the number of floors on which it is installed, as long as it is a drainage collector pipe that has a first protrusion, even if the shape is different).

[0078] In order to position the height position of the upper ends, which are the starting points of the first projections (drift plate 1200, drift plate 1204, drift plate 1205), below the pipe axis of horizontal branch pipe connecting portion 1120, it is necessary to lower the upper ends of the first projections in the upper pipe. In response to this need, as shown in Fig. 20, the outer periphery of the drainage collecting pipe is not provided with a recess (rib 1400) as shown in Fig. 3, and a wall 1105W is provided inside upper pipe 1105 to lower the eave-shaped drift plate 1205, which is the first projection. However, if the outer periphery is simply left as it is (without a recess (rib 1400) as shown in Fig. 3) and wall 1105W is provided inside, the wall 1105W will be thick, so it is necessary to remove the weight from the molding resin, and space 1105S is provided.

[0079] On the other hand, if there is a need to lower the upper end of the first protrusion in the upper pipe downward, instead of providing a wall 1105W inside the upper pipe 1105 as shown in Figure 20(C) and lowering the first protrusion, which is the eave-shaped deflector plate 1205, while removing the material (creating a space 1105S), it is also possible to provide a recess (rib 1400) on the outer periphery of the drainage collecting pipe as shown in Figure 3, thereby providing a recess (recess) while providing the function of reducing vibration or noise generated when wastewater hits the first protrusion (deflection plate 1200).

[0080] That is, if necessary to lower the upper end of the first protrusion in the upper pipe downward, a wall 1105W may be provided as shown in Figure 20 to lower the first protrusion, which is the eave-shaped deflection plate 1205, while removing material (providing a space 1105S), or a recess (rib 1400) may be provided on the outer periphery of the drainage collecting pipe as shown in Figure 3 to provide a recess (recess) while providing the function of reducing vibration or noise generated when wastewater hits the first protrusion (deflection plate 1200), or other structures may be used to lower the upper end of the first protrusion in the upper pipe downward.

[0081] <Sixth Modification> A sixth modified example of the drainage collecting pipe according to the present embodiment will be described with reference to FIG. 21. FIG. 21(A) and FIG. 21(B) are top views of the above-mentioned drainage collecting pipe 1000, which includes a first projection (drift plate 1200) on the upper pipe 1100 and a second projection (swirl vane 1600) on the lower pipe 1500. Note that FIG. 21(A) and FIG. 21(B) differ in the projected area S(1) of the first projection 1200 on a plane perpendicular to the axis of the drainage collecting pipe and the projected area S(2) of the second projection 1600 on a plane perpendicular to the axis of the drainage collecting pipe. What is characteristic is that, in a plan view seen from above, the ventilation area ratio excluding the first projection (drift plate 1200) and the second projection (swirl vane 1600) to the inner diameter area of ​​the upper pipe 1111 is 60% or more and 90% or less. When the ventilation area ratio is within this range, a sufficient air passage can be secured during drainage, and the desired drainage capacity can be exhibited.

[0082] To explain in more detail, as shown in FIG. 21, a drainage collecting pipe is connected to the upper riser pipe connection part 1110. When looking at the inside of the upper riser pipe 1111 in a direction parallel to the axis of the drainage collecting pipe, the ratio of the ventilation area excluding the first projection (drier plate 1200) and the second projection (swirl vane 1600) to the inner diameter area of ​​the upper riser pipe 1111 is 60% or more and 90% or less. That is, ·Inner diameter area of ​​upper riser 1111: S(U) The projected area of ​​the first projection 1200 on a plane perpendicular to the axis of the drainage collecting pipe: S(1) The projected area of ​​the second projection 1600 on a plane perpendicular to the axis of the drainage collecting pipe: S(2) As, Ventilation area (area of ​​the hatched part in Figure 21): S(A) = S(U) - (S(1) + S(2)) Ventilation area ratio 60%≦(S(A) / S(U))×100≦90% It is.

[0083] As described above, the drainage collecting pipe 1000 of this embodiment can provide a drainage collecting pipe that does not have a large number of parts, does not have a complex structure, and can stabilize quality, and that can prevent pressure fluctuations due to blockages in the standpipe by making the drainage flowing down from the upper floors into a swirling flow along the inner wall surface of the standpipe and providing an air core in the standpipe, thereby preventing the sealing water of sanitary equipment, etc. on each floor from being broken due to pressure fluctuations.

[0084] It should be noted that the embodiments disclosed herein are illustrative and not restrictive in all respects. The scope of the present invention is defined by the claims, not the above description, and is intended to include all modifications within the meaning and scope of the claims. [Industrial Applicability]

[0085] The present invention is preferable for a plastic drainage collecting pipe that is installed by penetrating the floor slab of a building, and is particularly preferable in that it can stabilize quality without increasing the number of parts or having a complex structure, and that an air wick is provided in the riser pipe to turn the drainage flowing down from the upper floors into a swirling flow along the inner wall surface of the riser pipe, thereby reducing pressure fluctuations due to blockages in the riser pipe and preventing the sealing of water in sanitary equipment, etc. on each floor from being broken due to pressure fluctuations. [Explanation of symbols]

[0086] 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 (end point side backflow prevention rib) 1340 Fourth backflow prevention rib (starting point side backflow prevention rib) 1410 Body equal diameter rib 1412 Rubber ring positioning rib 1500 lower tube 1600 Swirling blade (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, and the vertical axis of the upper pipe and the vertical axis of the lower pipe coincide to form the axis of the drainage manifold. 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 first 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 lower pipe is provided with a second projection that protrudes inward to alter the flow of the drainage, A drainage manifold characterized in that a first reinforcing rib extending parallel to the axis of the drainage manifold is provided on the back side of the first projection.

2. The drainage manifold according to claim 1, characterized in that the first reinforcing rib is provided parallel to a vertical plane including the pipe axis of the lateral branch pipe connection in a direction 180 degrees opposite to the direction without the lateral branch pipe connection.

3. The drain manifold according to claim 1 or claim 2, characterized in that, when viewed from the upper pipe connection portion into the interior of the drain manifold in a direction parallel to the axis, the first projection and the second projection do not overlap.

4. The drain manifold according to claim 1 or claim 2, characterized in that, when viewed from the upper riser connection portion into the drain manifold in a direction parallel to the axis, the lower end of the first projection does not overlap with the upper end of the second projection.

5. The drainage manifold according to claim 1 or claim 2, characterized in that it comprises a second reinforcing rib connecting the first reinforcing rib.

6. The drainage manifold according to claim 2, characterized in that the first reinforcing ribs are provided in pairs parallel to the vertical plane.

7. The drainage manifold according to claim 5, characterized in that the second reinforcing rib is curved along the pipe wall.

8. The drainage manifold includes a heat-expandable fire-resistant material that expands radially inward during a fire, crushing and sealing the hollow portion of the resin drainage manifold, The drainage manifold according to claim 1 or claim 2, characterized in that the first projection and the heat-expandable fire-resistant material do not overlap in the height direction.

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