Piping construction

Abstract

To reduce abnormal noise at a branch part.SOLUTION: A piping structure 20 comprises: a branch part to branch drainage discharged from a temporary storage tank 30 from a single channel 63 into a plurality of channels 65; a horizontal pipe 42 that is connected to the branch part and discharges the drainage stored in the temporary storage tank in a lateral direction; a vertical pipe 46 to generate siphon force in the horizontal pipe 42; an air supply part to supply air to the branch part; and a core component 70, which has an air supply channel to make the air pass to the branch part and a body part 72 in which cross sectional area of the channel at a lower part of the air supply part is smaller than cross sectional area of the opening and a drainage guide surface 76 extending from the single channel 63A toward the plurality of channels 65 is formed so that a downstream end 76E of the drainage guide surface 76 protrudes toward half or less of a top end height of the single channel 63.SELECTED DRAWING: Figure 6

Description

Technical Field

[0001] The present invention relates to a piping structure.

Background Art

[0002] Patent Document 1 below describes a siphon drainage system in which siphon force is applied to the drainage discharged from a plumbing fixture and stored in a temporary storage tank to cause it to flow out.

Prior Art Document

Patent Document

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] In the siphon drainage system of Patent Document 1, more siphon drain pipes are provided than the drain introduction pipe that guides the drainage to the temporary storage tank, and the siphon drain pipes each having a horizontal pipe and a vertical pipe are joined to the drain standpipe. According to the siphon drainage system of Patent Document 1, by having a plurality of siphon routes, the drainage from the temporary storage tank can be promoted.

[0005] By the way, in a state where siphon force is generated in the siphon drain pipe, it has been confirmed that not only does water flow in a full-flow state in the siphon drain pipe, but also air is intermittently sucked into the siphon drain pipe. Further, when there is a temporary storage tank for temporarily storing drainage, it has been confirmed by experiments that the generation of siphon force is promoted by the suction of the air when the siphon force is generated. When there are a plurality of siphon drain pipes, a configuration for sucking the air is required to be devised so that the sound generated by the suction of the air does not increase.

[0006] In view of the above facts, the present invention aims to provide a piping structure that promotes drainage from a temporary storage tank and reduces abnormal noise at branching points. [Means for solving the problem]

[0007] The piping structure of the first embodiment includes: a temporary storage tank for storing wastewater discharged from plumbing fixtures; a branching section for branching the wastewater discharged from the temporary storage tank from a single channel to multiple channels; a horizontal pipe connected to the branching section for discharging the wastewater stored in the temporary storage tank laterally; a vertical pipe that generates a siphon force in the horizontal pipe by allowing the wastewater from the horizontal pipe to flow downward; an air supply section connected to the upper part of the branching section for supplying air to the branching section; an opening formed in the air supply section; an air supply passage positioned within the air supply section so as to be removable from the opening and allowing air to pass through to the branching section; and a main body portion having a flow path cross-sectional area at the lower part of the air supply section smaller than the cross-sectional area of ​​the opening, and having a drainage guide surface extending from the single channel to the multiple channels, with the downstream end of the drainage guide surface protruding to less than half the height of the upper end of the single channel. single It includes a core member.

[0008] In the piping structure of the first embodiment, wastewater stored in the temporary storage tank flows from multiple horizontal pipes to vertical pipes, and the vertical pipes generate a siphon force on the horizontal pipes, thus promoting drainage from the temporary storage tank compared to the case with only one horizontal pipe.

[0009] Furthermore, since an air supply pipe is connected to the branching point where the wastewater discharged from the temporary storage tank is divided from a single channel into multiple channels, air can be drawn into each of the multiple horizontal pipes by the single air supply pipe, thereby efficiently improving the drainage capacity by siphon force.

[0010] Furthermore, a core member is positioned in the opening formed in the air intake section. This core member has a drainage guide surface formed from the single channel of the branching section toward the multiple channels, and a main body portion whose downstream end of the drainage guide surface protrudes to less than half the height of the upper end of the single channel. Therefore, the fast-flowing portion of the drainage is guided to a position less than half the height of the upper end of the single channel, reducing the buffer between it and the air drawn in from the air intake section connected to the upper part of the branching section. As a result, the inflow of air into the multiple channels becomes slower, and the noise generated by the air suction can be made relatively small.

[0011] Furthermore, since the core component is positioned within the air supply section so that it can be removed from the opening, the outlet section and the vicinity of the outlet section of the temporary storage tank can be easily accessed from the opening by removing the core component, allowing for cleaning.

[0012] In the second embodiment of the piping structure, the downstream end of the drainage guide surface protrudes downward from the upper end of the multiple flow channels, as in the piping structure of the first embodiment.

[0013] In this way, by making the downstream end of the drainage guide surface protrude below the upper end of the multiple flow channels, the fast-flowing portion of the drainage is guided below the upper end of the multiple flow channels, creating distance between it and the air drawn in from the air supply section connected to the upper part of the branching section. As a result, the inflow of air into the multiple flow channels becomes slower, and the noise generated by the air suction can be made relatively small.

[0014] In the third embodiment of the piping structure, the downstream end of the drainage guide surface protrudes downward to less than half the upper end height of the multiple flow channels, in the piping structure of the first or second embodiment.

[0015] In this way, by making the downstream end of the drainage guide surface protrude to less than half the height of the upper ends of the multiple flow channels, the fast-flowing portion of the drainage is guided to less than half the height of the upper ends of the multiple flow channels. Therefore, it is possible to create a greater distance between the drainage and the air drawn in from the air supply section connected to the upper part of the branching section. As a result, the inflow of air into the multiple flow channels becomes slower, and the noise generated by the air suction can be made relatively small.

[0016] The fourth embodiment of the piping structure is a piping structure according to any one embodiment of the first to third embodiments, wherein each of the multiple flow paths has a smaller diameter than the single flow path, and the drainage guide surface extends from the upper end of the single flow path.

[0017] According to the piping structure of the fourth embodiment, wastewater can be smoothly flowed into multiple channels with smaller diameters than a single channel.

[0018] The fifth embodiment of the piping structure is a piping structure of any one embodiment of the first to fourth embodiments, wherein the lower end of the drainage guide surface is shaped to connect the multiple flow paths in a straight line at the downstream end.

[0019] In the piping structure of the fifth embodiment, upstream between multiple flow paths, the lower end of the drain guide surface directs the faster-flowing portion of the drainage downward. Therefore, a distance can be maintained from the air being drawn in, the inflow of air into the multiple flow paths becomes gradual, and the noise generated by the air suction can be made relatively small. [Effects of the Invention]

[0020] According to the piping structure of the present invention, drainage from the temporary storage tank can be promoted, and abnormal noise at the branching section can be reduced. [Brief explanation of the drawing]

[0021] [Figure 1] This is a side view showing a piping structure according to an embodiment of the present invention. [Figure 2] This is a perspective view showing a piping structure according to an embodiment of the present invention. [Figure 3]It is a perspective view showing the vicinity of a branch joint of a piping structure according to an embodiment of the present invention. [Figure 4] It is a cross-sectional view taken along line B-B of FIG. 5. [Figure 5] It is a cross-sectional view taken along line A-A of FIG. 3. [Figure 6] It is a view of the piping structure according to an embodiment of the present invention as seen from the upstream side of a single flow path. [Figure 7] It is a perspective view of a core member according to an embodiment of the present invention. [Figure 8] It is a view of the piping structure according to a modification of an embodiment of the present invention as seen from the upstream side of a single flow path. [Figure 9] It is a view of the piping structure according to a comparative example as seen from the upstream side of a single flow path. [Figure 10] It is a graph showing the relationship between the time from the start of drainage and the noise near the branch joint. [Figure 11] It is a table showing the average noise and average water level after the siphon is activated.

Embodiments for Carrying Out the Invention

[0022] Hereinafter, the piping structure according to an embodiment of the present invention will be described with reference to the drawings. Components denoted by the same reference numerals in each drawing mean the same components. However, unless otherwise specified in the specification, each component is not limited to one, and a plurality of them may exist.

[0023] Also, descriptions of overlapping configurations and reference numerals in each drawing may be omitted. Note that the present invention is not limited to the following embodiments, and appropriate changes such as omitting configurations or replacing them with different configurations can be made within the scope of the object of the present invention.

[0024] The arrow Z in the figure indicates the upward direction in the vertical direction, and the arrows X and Y indicate directions orthogonal to each other in the horizontal direction.

[0025] <Piping Structure> (Siphon Drainage System)

[0026] Figure 1 shows a schematic diagram of the piping structure 20 according to this embodiment. The piping structure 20 is a siphon drainage system that uses siphon force to discharge wastewater from plumbing fixtures 12. The piping structure 20 is used, as an example, in a multi-story apartment building 10.

[0027] The piping structure 20 includes drain risers 22 that carry wastewater downwards. The drain risers 22 extend vertically and penetrate the slabs 14 on each floor of the apartment building 10. Multiple drain risers 22 are provided at different locations on the floor plan of the apartment building 10. For example, the drain risers 22 are housed in piping spaces (also referred to as pipe spaces, etc.) that are partitioned by walls from each residence on each floor of the apartment building 10.

[0028] Each dwelling unit in the apartment building 10 is equipped with plumbing fixtures 12. The plumbing fixtures 12 are, for example, bathroom units, in which a bathtub 12A and a washing area 12B are integrated. One end of a drainage pipe 24 is connected to the plumbing fixtures 12.

[0029] The other end of the drainage inlet pipe 24 is connected to a temporary storage tank 30, which will be described later. This allows the drainage inlet pipe 24 to introduce wastewater discharged from the bathtub 12A and washing area 12B of the plumbing fixtures 12 into the temporary storage tank 30. It is preferable that the drainage inlet pipe 24 is installed with a slope such that the temporary storage tank 30 side is lower.

[0030] As shown in Figure 2, the temporary storage tank 30 is capable of temporarily storing wastewater from the plumbing fixtures 12 and is formed in a roughly rectangular parallelepiped shape. An inlet 30A is formed on one side wall of the temporary storage tank 30, to which the other end of the drainage introduction pipe 24 is connected. A projection 30B is formed on the lower part of the other side wall of the temporary storage tank 30 that is opposite to the first side wall. The inlet 30A is shaped so that the connection side of the drainage introduction pipe 24 is concave.

[0031] A branch joint 60, which will be described later, is connected to the protruding portion 30B, and a siphon drain pipe 40 is connected via the branch joint 60. The protruding portion 30B is convex in shape, protruding towards the side to which the branch joint 60 is connected, and a horizontally elongated elongated outlet opening 30C (see Figure 4) is formed at its tip. The temporary storage tank 30 is made of a resin material such as polyvinyl chloride.

[0032] An inspection opening 32 is formed in the top wall of the temporary storage tank 30, and the inspection opening 32 is closed with a lid 34.

[0033] (Branch joint) As shown in Figures 3 and 4, the branch joint 60 has a single-flow channel section 62 and a double-flow channel section 64. The single-flow channel section 62 extends from the protruding section 30B, and within the single-flow channel section 62, there is a single flow channel 63A that is continuous with the outlet opening 30C, and a single space 63B that is horizontally expanded from the single flow channel 63A and perpendicular to the single flow channel 63A.

[0034] The double-flow channel section 64 protrudes in two parallel directions from the single-flow channel section 62, and two branch channels 65 are formed inside, arranged parallel to each other along the outer shape of the double-flow channel section 64. Each branch channel 65 is continuous with the single space 63B, and a horizontal pipe 42, which will be described later, is connected to it. As shown in Figure 5, the inner diameter of the single channel 63A is larger than the inner diameter of the branch channels 65, and as shown in Figure 6, the lower end of the single channel 63A is positioned at approximately the same height as the lower end of the branch channels 65, and the upper end of the single channel 63A is positioned at twice the height of the upper end of the branch channels 65. In other words, the inner diameter of the single channel 63A is twice the size of the inner diameter of the branch channels 65.

[0035] An air supply connection section 61 is formed at the upper part of the single-flow section 62, serving as an air supply section. The air supply connection section 61 is roughly cylindrical, and a communication flow path 61A is formed inside that communicates with the upper part of the single space 63B. An inspection opening 61B is formed at the upper end of the air supply connection section 61, opening upward from the communication flow path 61A. The inspection opening 61B is closed with a cover 61D. In addition, a connection opening 61C is formed on the upper side of the air supply connection section 61, opening from the communication flow path 61A toward the vent pipe 50. The air supply pipe 66 is connected to the connection opening 61C.

[0036] (Core component) A core member 70 is positioned inside the air supply connection section 61. As shown in Figure 7, the core member 70 is substantially cylindrical and has a main body 72 and a locking portion 74. The locking portion 74 is annular in shape and constitutes the upper end of the core member 70, and is locked to the inner circumferential wall that forms the inspection opening 61B of the air supply connection section 61. The core member 70 can be removed from the inspection opening 61B to the outside of the communication passage 61A inside the air supply connection section 61.

[0037] The main body portion 72 extends downward from the locking portion 74 and is positioned in the communication passage 61A. On the side surface of the main body portion 72, an air intake inlet space 72A and an air intake passage space 72B are formed as an example of an air intake passage. As shown in Figure 4, the air intake inlet space 72A is formed such that the main body portion 72 is concave at a position corresponding to the connection opening 61C of the air intake connection portion 61. The air intake passage space 72B is formed such that the main body portion 72 is concave on the side of the horizontal pipe 42, rotated 90° from the air intake inlet space 72A when viewed from above. The air intake inlet space 72A is formed at the height corresponding to the connection opening 61C in the vertical direction (Z direction), and the air intake passage space 72B is formed from the same position as the upper end of the air intake inlet space 72A to its lower end in the vertical direction (Z direction), and is in communication with the air intake inlet space 72A.

[0038] The sides of the main body 72 where the air intake inlet space 72A and the air intake flow path space 72B are not formed are shaped to follow the inner wall of the air intake connection part 61. As shown in Figure 5, the lower part (bottom surface) of the main body 72 extends from the upper end of the single flow path 63A of the branch joint 60 toward the branch flow path 65 and slopes downward in two stages, forming a drainage guide surface 76. The angle of inclination of the drainage guide surface 76 with respect to the horizontal in the drainage direction is set to be greater on the upstream side than on the downstream side. The downstream end 76E of the drainage guide surface 76 is located at the lowest vertical (Z direction) side within the single flow path 63A and is positioned to protrude below the upper end of the branch flow path 65. In this embodiment, the downstream end 76E of the drainage guide surface 76 is located at a radius from the upper end of the branch flow path 65, in other words, at half the height of the branch flow path 65.

[0039] The downstream end 76E of the drainage guide surface 76 is connected in a straight line so as to maintain a height that is positioned as far down vertically as possible within the single flow path 63A. In other words, the downstream end 76E of the drainage guide surface 76 is shaped to connect the branched flow paths 65 in a straight line horizontally when viewed from the drainage direction.

[0040] With the core member 70 positioned in the communication channel 61A, the main body 72 is positioned on the upstream side (left side in Figure 5) in the direction of drainage flow inside the air supply connection 61. Therefore, the cross-sectional area of ​​the air supply channel space 72B, which is the part through which air flows at the bottom of the communication channel 61A, is smaller than the opening area of ​​the inspection opening 61B. In this embodiment, the cross-sectional area of ​​the lower end of the communication channel 61A is the opening area of ​​the air supply channel space 72B to the single channel 63A, and is the opening S.

[0041] The connection opening 61C is connected to the connection port 67A at one end of the air supply pipe 66. The connection port 67B at the other end of the air supply pipe 66 is connected to the vent pipe 50.

[0042] (Siphon drain pipe) As shown in Figure 2, the siphon drain pipe 40 comprises a plurality of horizontal pipes 42 (two in this embodiment) arranged along the slab 14, a confluence horizontal pipe 44, a vertical pipe 46, and a horizontal confluence joint member 48.

[0043] The horizontal pipe 42 discharges wastewater from the plumbing fixtures 12 laterally through multiple channels. The horizontal pipe 42 is made of, for example, a polybutene pipe with a nominal diameter of 25J (inner diameter of approximately 28mm) and is laid horizontally on the slab 14 without any slope. Note that "without slope" here does not mean that it must be strictly horizontal, but includes slight steps or slopes along the slab 14.

[0044] The upstream ends of each of the two horizontal pipes 42 are connected to the branch channel 65 of the branch joint 60. The downstream ends of each of the horizontal pipes 42 are connected to a single combined horizontal pipe 44 via a combined horizontal joint member 48. The combined horizontal pipe 44 is a horizontal pipe that discharges the wastewater introduced from the two horizontal pipes 42 in a lateral direction. The combined horizontal pipe 44 and the combined horizontal joint member 48 may be integrally constructed.

[0045] The combined cross-sectional area of ​​the two horizontal pipes 42 is preferably less than the cross-sectional area of ​​the drainage inlet pipe 24. Similarly, the cross-sectional area of ​​the combined horizontal pipe 44 is preferably less than the combined cross-sectional area of ​​the two horizontal pipes 42. The combined horizontal pipe 44 and the horizontal pipes 42 are configured with cross-sectional areas such that, considering the amount of wastewater drained from the drainage inlet pipe 24, wastewater flows through them at full capacity as needed.

[0046] As shown in Figures 1 and 2, a merging horizontal pipe 44 is connected to the upstream side of the vertical pipe 46. The vertical pipe 46 is arranged vertically along the drain riser 22, generating a siphon force in the horizontal pipe 42. The other end of the vertical pipe 46 is connected to a merging joint 26. The merging joint 26 is a joint member that allows the drainage from the vertical pipe 46 to merge with the drain riser 22.

[0047] The combined horizontal pipe 44 and vertical pipe 46 form a single continuous path up to the combined joint 26 without merging with other drain pipes along the way, and guide the drainage to the drain riser pipe 22. The connection between the combined horizontal pipe 44 and the vertical pipe 46 is shown as a continuous bent pipe, but joint members such as elbows may be placed in this bent pipe section. If joint members are placed, inspection openings may be provided in the joint members as appropriate.

[0048] As shown in Figure 2, a vent pipe 50 is connected to the temporary storage tank 30. One end of the vent pipe 50 is connected to the upper part of the side wall where a protrusion 30B is formed in the temporary storage tank 30, and extends approximately parallel to the horizontal pipe 42. The other end of the vent pipe 50 is connected to a junction joint 26. The connection port 67B on the other end of the air supply pipe 66 is connected to the portion of the vent pipe 50 closest to the temporary storage tank 30. The air supply pipe 66 is connected to the drain riser pipe 22 via the junction joint 26. Air enters and exits the temporary storage tank 30 through the vent pipe 50 so that the pressure inside the temporary storage tank 30 becomes atmospheric pressure. Air is also supplied from the vent pipe 50 to the horizontal pipe 42 via the air supply pipe 66.

[0049] <Mechanism and Effects> Next, the operation and effects of the piping structure 20 of this embodiment will be explained.

[0050] The wastewater discharged from the plumbing fixtures 12 flows into the temporary storage tank 30 from the inlet 30A via the drainage introduction pipe 24. The wastewater that flows into the temporary storage tank 30 is divided into two horizontal pipes 42 via the branch joint 60 from the protruding section 30B, merges at the confluence horizontal pipe 44, is led to the vertical pipe 46, and is discharged into the drainage riser pipe 22.

[0051] In the initial stages of wastewater flowing into the temporary storage tank 30, the vertical pipe 46 is not yet full, and no siphon force is generated. Therefore, the amount of wastewater discharged from the protrusion 30B per unit time is less than the amount of wastewater flowing into the temporary storage tank 30 per unit time, causing the wastewater level in the temporary storage tank 30 to rise. As the wastewater level in the temporary storage tank 30 rises, the air inside the temporary storage tank 30 is pushed and discharged to the drain riser pipe 22 via the vent pipe 50. This allows wastewater to flow into the temporary storage tank 30 quickly and efficiently.

[0052] When the vertical pipe 46 becomes full and the wastewater falls through the vertical pipe 46 due to gravity, a siphon force is generated due to the potential energy of the siphon head. When a siphon force is generated, the wastewater in the temporary storage tank 30 is sucked in, and the drainage velocity increases. In this embodiment, the wastewater stored in the temporary storage tank 30 is drained through two horizontal pipes 42. Therefore, compared to a configuration in which only one horizontal pipe 42 is connected to the temporary storage tank 30, the wastewater treatment capacity from the temporary storage tank 30 can be increased.

[0053] When a siphon force is generated and the drainage from the temporary storage tank 30 is drawn in, negative pressure is created inside the temporary storage tank 30, so air is supplied to the temporary storage tank 30 from the vent pipe 50. In addition, air is appropriately drawn in from the vent pipe 50 through the air supply pipe 66, through the air supply inlet space 72A and the air supply flow path space 72B in the air supply connection section 61, and into the branch flow path 65. The air drawn into the branch flow path 65 flows into the horizontal pipe 42. This air intake promotes the generation of a siphon force in the siphon drain pipe 40. In this embodiment, one air supply pipe 66 can draw air into each of the multiple horizontal pipes 42, thereby efficiently improving the drainage capacity due to the siphon force.

[0054] Furthermore, in this embodiment, the drainage guide surface 76 is positioned so as to extend from the upper end of the single flow path 63A in the branch joint 60 toward the branch flow path 65, and the downstream end 76E of the drainage guide surface 76 protrudes below the upper end of the branch flow path 65. Therefore, the portion of the drainage flow that is fast is guided below the upper end of the branch flow path 65, creating a distance from the air being drawn in. As a result, the inflow of air into the branch flow path 65 becomes slower, and the noise generated by the air suction can be made relatively small.

[0055] In this embodiment, the downstream end 76E of the drainage guide surface 76 protrudes below the upper end of the branched channel 65, but it is sufficient for the downstream end 76E of the drainage guide surface 76 to protrude to less than half the height of the upper end of the single channel 63A. In particular, in this embodiment, the downstream end 76E of the drainage guide surface 76 is positioned below the upper end of the branched channel 65 and at half the height of the upper end of the branched channel 65, so that there is sufficient distance between the fast-flowing wastewater and the air being drawn in.

[0056] Furthermore, in this embodiment, the downstream end 76E of the drainage guide surface 76 is shaped to connect the branched channels 65 in a straight line horizontally when viewed from the drainage direction. Therefore, the lower end 76E of the drainage guide surface 76 guides the fast-flowing portion of the drainage below the upper end of the branched channels 65. This allows for a distance to be created between the fast-flowing portion of the drainage and the air being drawn in between the branched channels 65, resulting in a slower inflow of air into the branched channels 65 and a relatively reduced noise caused by the air suction.

[0057] Furthermore, in this embodiment, the air supply pipe 66 is connected to the vent pipe 50 which is connected to the temporary storage tank 30. Therefore, when the water level in the temporary storage tank 30 rises and wastewater from the temporary storage tank 30 flows into the vent pipe 50, the wastewater can be discharged into the horizontal pipe 44 via the air supply pipe 66.

[0058] Furthermore, when performing maintenance and inspection of the temporary storage tank 30, the lid 34 is opened and the inside of the temporary storage tank 30 is accessed through the inspection port 32. Also, the lid 61D is opened and the core member 70 is removed through the inspection opening 61B, and the branch joint 60 and protrusion 30B are accessed from the communication passage 61A of the air supply connection part 61.

[0059] In this embodiment, the protruding portion 30B and the branch joint 60, which tend to accumulate dirt, can be easily accessed through the inspection opening 61B. Furthermore, by arranging the core member 70 in the connecting passage 61A, the cross-sectional area of ​​the air passage can be freely reduced even when the inspection opening 61B is relatively large.

[0060] In this embodiment, two horizontal pipes 42 are provided, but there may be three or more horizontal pipes 42. Also, in this embodiment, the horizontal pipes 42 are joined to a single confluence horizontal pipe 44, but instead of joining them, each horizontal pipe 42 may be connected to an individual vertical pipe 46 and joined to the drain riser pipe 22. As in this embodiment, by joining to a single vertical pipe 46, a large amount of wastewater is collected in the vertical pipe 46, so the flow rate of wastewater necessary to generate siphon force can be secured quickly, and the siphon generation time can be shortened.

[0061] (Other embodiments) In the above embodiment, an example was described in which the downstream end 76E of the drainage guide surface 76 is positioned at half the height of the upper end of the branched channel 65 (see Figure 6). However, the downstream end 76E may be positioned at or below half the height of the upper end of the single channel 63A and above half the height of the upper end of the branched channel 65 (see Figure 8).

[0062] [Example Test] To confirm the effectiveness of the piping structure according to the above embodiment, the following tests were conducted for three different configurations in which the lower end position of the drainage guide surface of the core member 70 differed.

[0063] (Test conditions) As embodiments to which the present invention is applied, Embodiment 1 shown in Figure 6 and Embodiment 2 shown in Figure 8 (where the downstream end 76E of the drainage guide surface 76 is positioned above half the height of the upper end of the branch channel 65) were used. In addition, as a comparative example, Comparative Example 1 (see Figure 9) was used, where the position of the downstream end 76E is positioned higher than the radius of the single channel 63A and above the upper end of the branch channel 65.

[0064] The structure was identical except for the downstream end position of the drainage guide surface. The evaluation was performed using noise near the branch joint 60. Figure 10 is a graph showing the relationship between the elapsed time from the start of drainage and the noise. Figure 11 shows the average noise after siphon activation. The values ​​are shown as relative indices, with larger values ​​indicating higher noise levels. From the table shown in Figure 11, it was confirmed that abnormal noise was suppressed more effectively in Examples 1 and 2 than in Comparative Example 1. [Explanation of Symbols]

[0065] 12 plumbing fixtures, 20 piping structures, 30 temporary storage tanks 42 Horizontal pipe, 46 Vertical pipe, 60 Branch joint (branch section) 61 Air supply connection (air supply section), 61B Inspection opening (opening) 63A Single channel, 65 Branching channel (multiple channels) 70 Core component, 72 Main body, 72B Air supply passage space (air supply passage) 76 Drainage guide surface, 76E Downstream end

Claims

1. A temporary storage tank for storing wastewater discharged from plumbing fixtures, A branching section that branches the wastewater discharged from the temporary storage tank from a single channel to multiple channels, A horizontal pipe connected to the aforementioned branching section, which discharges the wastewater stored in the temporary storage tank in a horizontal direction, A vertical pipe that generates a siphon force in the horizontal pipe by allowing the drainage from the horizontal pipe to flow down, An air supply unit connected to the upper part of the branching section and supplying air to the branching section, The opening formed in the aforementioned air supply section, An air supply passage is positioned within the air supply section so as to be removable from the opening, allowing air to pass through to the branching section, and the cross-sectional area of ​​the flow path at the bottom of the air supply section is made smaller than the cross-sectional area of ​​the opening, and a drainage guide surface is formed that extends from the single flow path to the multiple flow paths below the drainage guide surface. A single core member having a main body portion whose flow end protrudes to less than half the upper end height of the single flow path, Equipped with, The lower end of the drainage guide surface is shaped to connect the multiple flow paths in a straight line at the downstream end, in this piping structure.

2. The piping structure according to claim 1, wherein the downstream end of the drainage guide surface protrudes downward from the upper end of the plurality of flow channels.

3. The piping structure according to claim 1, wherein the downstream end of the drainage guide surface protrudes to less than half the upper end height of the multiple flow channels.

4. Each of the multiple channels has a smaller diameter than the single channel, and the drainage guide surface extends from the upper end of the single channel. The piping structure according to claim 1.

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