Pipe structure and pipe joint

Abstract

To provide a piping structure capable of suppressing an increase of a drainage time while shortening a syphon generation time.SOLUTION: A piping structure 20 includes first horizontal pipes 31A, 31B each connected to the downstream side of a temporary storage tank 30 provided in a drainage system via a branch connection 28 for discharging drainage water discharged from the temporary storage tank 30 in the horizontal direction, a combined joint 48 (a joint part) for joining the first horizontal pipes 31A, 31B into one, and a solid pipe 46 connected to the downstream side of the combined joint 48 for making the drainage water flow down to generate syphon force in the first horizontal pipes 31A, 31B, the branch connection 28 including pipe connection parts 29A, 29B to which the upstream ends of the first horizontal pipes 31A, 31B are connected, respectively, the pipe connection parts 29A, 29B being differently located on the branch connection 28 in a drainage inflow direction F1, with their outer peripheries partially overlapping with each other in the drainage inflow direction F1.SELECTED DRAWING: Figure 6

Description

Technical Field

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

Background Art

[0002] A siphon drainage system is disclosed which has a temporary storage tank for temporarily storing the drainage discharged from water-related appliances, and a plurality of siphon drain pipes connected to the temporary storage tank and applying a siphon force to the drainage stored in the temporary storage tank to cause it to flow out (see Patent Document 1). The siphon drain pipe is configured to include a horizontal pipe connected to the temporary storage tank, and a vertical pipe communicating with the downstream side of the horizontal pipe and extending downward to merge with a drainage standpipe.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] In the above-described conventional example, by making the inner diameter of the siphon drain pipe smaller than the inner diameter of 20 to 25 mm that has been used in conventional siphon drainage systems, full flow quickly occurs in the drop portion from the horizontal pipe to the vertical pipe, thereby shortening the time until the siphon force is activated (siphon generation time).

[0005] However, the drainage volume per unit time of plumbing fixtures varies from fixture to fixture. For example, while the drainage from a toilet is less than 10 liters at a time, the drainage from a bathtub or the like may be about 200 liters at a time. When draining such a large amount of water, it may take time to drain with a siphon drain pipe having a small inner diameter. Also, when the horizontal pipe is long (for example, 10 m), it takes time to obtain the flow rate necessary for siphon generation at the drop section, resulting in a long siphon generation time and the drainage being likely to stagnate in the temporary storage tank.

[0006] An object of the present invention is to shorten the siphon generation time while ensuring the drainage treatment volume in a structure in which a plurality of siphon drain pipes are provided in a temporary storage tank.

Means for Solving the Problems

[0007] The piping structure according to the first aspect is connected via a branch joint to the downstream side of a temporary storage tank provided in a drainage system, and includes a plurality of horizontal pipes that discharge the drainage discharged from the temporary storage tank in a lateral direction, a confluence section that merges the plurality of first horizontal pipes into one, and a vertical pipe that is connected to the downstream side of the confluence section and generates a siphon force in the horizontal pipe by allowing the drainage to flow down. The branch joint includes a plurality of pipe connection portions to which the upstream ends of the plurality of horizontal pipes are respectively connected, and the plurality of pipe connection portions have different positions in the drainage inflow direction in the branch joint and a part of the outer periphery of adjacent ones overlaps in the drainage inflow direction.

[0008] In the piping structure according to the first aspect, drainage is discharged from the temporary storage tank through a plurality of horizontal pipes. Thereby, the drainage treatment volume can be ensured, and the overflow of drainage in a bathroom or the like located upstream of the temporary storage tank can be suppressed. Also, in the piping structure according to the first aspect, since a plurality of horizontal pipes merge into one at the confluence section, a full flow can be quickly generated in the portion between the confluence section and the vertical pipe. Thereby, the siphon generation time can be shortened. Furthermore, in the piping structure according to the first aspect, the positions of the plurality of pipe connection parts of the branch joint in the drainage inflow direction are different from each other, and a part of the outer peripheries of adjacent ones of the plurality of pipe connection parts overlap in the drainage inflow direction. For this reason, for example, adjacent ones of the plurality of pipe connection parts do not overlap in the drainage inflow direction. In other words, compared with a configuration in which adjacent ones of the plurality of pipe connection parts are separated in a direction orthogonal to the drainage inflow direction, the size of the branch joint can be reduced.

[0009] The second aspect is the piping structure according to the first aspect, in which the confluence part is a confluence joint, the confluence joint includes a plurality of pipe connection parts to which the downstream ends of the plurality of the lateral pipes are respectively connected, and the positions of the plurality of the pipe connection parts in the drainage outflow direction in the confluence joint are different from each other and a part of the outer peripheries of adjacent ones overlap in the drainage inflow direction.

[0010] In the piping structure according to the second aspect, the positions of the plurality of pipe connection parts of the confluence joint in the drainage outflow direction are different from each other, and a part of the outer peripheries of adjacent ones of the plurality of pipe connection parts overlap in the drainage outflow direction. For this reason, for example, adjacent ones of the plurality of pipe connection parts do not overlap in the drainage outflow direction. In other words, compared with a configuration in which adjacent ones of the plurality of pipe connection parts are separated in a direction orthogonal to the drainage outflow direction, the size of the confluence joint can be reduced. Also, the distance between the lateral pipes respectively connected to the plurality of pipe connection parts of the branch joint and the plurality of pipe connection parts of the confluence joint can be made closer. Thereby, the laying pitch of the lateral pipes when laying the lateral pipes can be narrowed, and the degree of freedom in design during construction is improved.

[0011] The third aspect is the piping structure according to the first aspect or the second aspect, in which the branch joint is connected to the temporary storage tank, and has a straight pipe part that extends linearly and a branch pipe part that branches from the middle of the straight pipe part and extends obliquely with respect to the pipe axis direction of the straight pipe part, and the pipe connection parts are provided at the downstream end of the straight pipe part and the downstream end of the branch pipe part respectively.

[0012] In the piping structure according to the third aspect, the wastewater in the temporary storage tank flows into one of the lateral pipes through the straight pipe portion of the branch joint and into the other lateral pipe through the branch pipe portion. Here, in the straight pipe portion of the branch joint, since the wastewater in the temporary storage tank flows linearly, the decrease in the flow velocity is small, and full flow can be quickly generated in the portion between the confluence portion and the vertical pipe. Thereby, the siphon generation time can be shortened.

[0013] The fourth aspect is a piping structure according to the third aspect that cites the second aspect, in which the downstream end of the lateral pipe connected to the straight pipe portion of the branch joint is connected to the branch pipe portion of the confluence joint, and the downstream end of the lateral pipe connected to the branch pipe portion of the branch joint is connected to the branch pipe portion of the confluence joint.

[0014] In the piping structure according to the fourth aspect, wastewater flows from the straight pipe portion of the branch joint to the branch pipe portion of the confluence joint through one of the lateral pipes. Also, wastewater flows from the branch pipe portion of the branch joint to the straight pipe portion of the confluence joint through the other lateral pipe. For this reason, the difference in flow velocity generated at the branch joint is offset at the confluence joint. Thereby, the bias of the flow in the plurality of lateral pipes is suppressed, and the wastewater can be quickly flowed to the portion between the confluence joint and the vertical pipe.

[0015] The piping structure according to the fifth aspect is connected to the downstream side of a temporary storage tank provided in a drainage system, and includes a plurality of lateral pipes that discharge the wastewater discharged from the temporary storage tank in the lateral direction, a confluence joint that combines the plurality of first lateral pipes into one, and a vertical pipe that is connected to the downstream side of the confluence joint and generates a siphon force in the lateral pipe by allowing the wastewater to flow down. The confluence joint includes a plurality of pipe connection portions to which the upstream ends of the plurality of lateral pipes are respectively connected. The plurality of pipe connection portions have different positions in the wastewater outflow direction in the confluence joint, and a part of the outer periphery of adjacent ones overlaps in the wastewater outflow direction.

[0016] In the piping structure according to the fifth aspect, drainage is discharged from the temporary storage tank through a plurality of lateral pipes. Thereby, the drainage treatment amount can be ensured, and overflow of drainage in a bathroom or the like located upstream of the temporary storage tank can be suppressed. Further, in the piping structure according to the fifth aspect, since a plurality of lateral pipes merge into one at the junction joint, a full flow can be quickly generated in the portion between the junction joint and the vertical pipe. Thereby, the siphon generation time can be shortened. Furthermore, in the piping structure according to the fifth aspect, the positions of the drainage outflow directions of the plurality of pipe connection parts of the junction joint are different from each other, and a part of the outer circumferences of adjacent ones of the plurality of pipe connection parts overlap in the drainage outflow direction. For this reason, for example, adjacent ones of the plurality of pipe connection parts do not overlap in the drainage outflow direction. In other words, compared with a configuration in which adjacent ones of the plurality of pipe connection parts are separated in a direction orthogonal to the drainage outflow direction, the size of the junction joint can be reduced.

[0017] The pipe joint according to the sixth aspect includes a first pipe connection part to which a first tubular body is connected, and a plurality of second pipe connection parts to which a plurality of second tubular bodies are respectively connected. The plurality of second pipe connection parts have different positions in the flow direction of the fluid flowing through the first tubular body and a part of the outer circumferences of adjacent ones overlap in the flow direction.

[0018] In the pipe joint according to the sixth aspect, the positions of the plurality of second pipe connection parts in the flow direction of the fluid flowing through the first tubular body are different from each other, and a part of the outer circumferences of adjacent ones of the plurality of second pipe connection parts overlap in the fluid flow direction. For this reason, for example, adjacent ones of the plurality of second pipe connection parts do not overlap in the fluid flow direction. In other words, compared with a configuration in which adjacent ones of the plurality of second pipe connection parts are separated in a direction orthogonal to the fluid flow direction, the size of the joint can be reduced.

Advantages of the Invention

[0019] According to the present invention, in a structure in which a plurality of siphon drain pipes are provided in a temporary storage tank, it is possible to shorten the siphon force generation time while ensuring the drainage treatment amount.

Brief Description of the Drawings

[0020]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8

Figure 9

Figure 10

Figure 11

Figure 12

MODE FOR CARRYING OUT THE INVENTION

[0021] Hereinafter, embodiments for carrying out the present invention will be described with reference to the drawings. Components denoted by the same reference numerals in each drawing mean the same or similar components. In the embodiments described below, duplicate explanations and reference numerals may be omitted. In addition, the drawings used in the following description are all schematic, and the dimensional relationships between the respective elements shown in the drawings, the ratios of the respective elements, etc. do not necessarily match the actual ones. Also, the dimensional relationships between the respective elements and the ratios of the respective elements do not necessarily match even between multiple drawings.

[0022] FIG. 1 shows an overview of the piping structure 20 according to this embodiment. The piping structure 20 is a structure of a siphon drainage system that discharges drainage from the plumbing fixture 12 by utilizing siphon force. As an example, the piping structure 20 is used in a multi-story condominium 10. As shown in FIG. 2, this piping structure 20 includes a plurality (a pair in this embodiment) of first horizontal pipes 31A and 31B, a junction joint 48 as an example of a junction part, a second horizontal pipe 44, and a vertical pipe 46. The portion from the first horizontal pipes 31A and 31B to the vertical pipe 46 can also be called the siphon drainage pipe 40.

[0023] The piping structure 20 includes a drainage riser 22 that allows drainage to flow downward. A plurality of drainage risers 22 are provided at different locations on the plane in the condominium 10. For example, the drainage riser 22 is accommodated along the vertical direction (longitudinal direction) in a piping space (also referred to as a pipe space etc.) partitioned by a wall from each dwelling unit on each floor of the condominium 10, and penetrates the slab 14 on each floor of the condominium 10.

[0024] Each dwelling unit of the condominium 10 is provided with a plumbing fixture 12. The plumbing fixture 12 is, for example, a bathroom unit in which a bathtub 12A and a washbasin 12B are integrated. One end of a drainage introduction pipe 24 is connected to the plumbing fixture 12.

[0025] The other end of the drainage introduction pipe 24 is connected to a temporary storage tank 30. Thereby, the drainage introduction pipe 24 introduces the drainage discharged from the bathtub 12A and the washbasin 12B of the plumbing fixture 12 to the temporary storage tank 30. Note that it is preferable that the drainage introduction pipe 24 is arranged with a gradient such that the side of the temporary storage tank 30 is lower.

[0026] The other end of the drainage inlet pipe 24 is connected to a temporary storage tank 30, which will be described later as an example of a temporary storage tank. As a result, the drainage inlet pipe 24 introduces the drainage discharged from the bathtub 12A and the washbasin 12B of the plumbing fixture 12 into the temporary storage tank 30. Note that the drainage inlet pipe 24 is preferably arranged with a gradient such that the side of the temporary storage tank 30 is lower. Further, the drainage inlet pipe 24 has, for example, a nominal diameter of 50A (inner diameter of 50 mm).

[0027] As shown in FIG. 3, a branch joint 28 is connected to the downstream side of the outlet 30A, which is the drainage outlet of the temporary storage tank 30 provided in the drainage system. The inner diameter of the outlet 30A is, for example, about 53 mm.

[0028] The branch joint 28 includes a plurality (two in this embodiment) of pipe connection parts 29A and 29B to which the upstream ends of the first horizontal pipes 31A and 31B are respectively connected. The pipe connection parts 29A and 29B are located at different positions in the drainage inflow direction (the direction indicated by the arrow F1 in the figure) in the branch joint 28. Here, the drainage inflow direction in the branch joint 28 is the direction in which the drainage flows into the branch joint 28. In this embodiment, it is the direction in which the drainage flows from the outlet 30A of the temporary storage tank 30 into the branch joint 28, and is the same as the axial direction (central axis direction) of the outlet 30A. Note that in this embodiment, as shown in FIG. 4, the pipe connection part 29A is located downstream of the pipe connection part 29B. Also, a part of the outer circumferences of the pipe connection parts 29A and 29B overlap each other in the drainage inflow direction F1. In other words, when viewed from the drainage inflow direction F1, a part of the outer circumferences of the pipe connection parts 29A and 29B overlap each other in the drainage inflow direction F1.

[0029] Further, the branch joint 28 includes a straight pipe portion 28A and a branch pipe portion 28B. The straight pipe portion 28A is connected to the outlet 30A of the temporary storage tank 30 via a reducing joint 34. Specifically, the upstream end of the straight pipe portion 28A is connected to the outlet 30A of the temporary storage tank 30 via a reducing joint 34. Note that the branch joint 28 may be directly connected to the outlet 30A without using the reducing joint 34, or a same-diameter joint may be used. The straight pipe portion 28A extends linearly along the drainage inflow direction F1. The branch pipe portion 28B has a branch portion 28C that branches from the middle of the straight pipe portion 28A and extends obliquely with respect to the axial direction of the straight pipe portion 28A.

[0030] The straight pipe portion 28A and the branch pipe portion 28B intersect at an acute angle on the downstream side at the branch point. The branch pipe portion 28B is bent in the middle. As a result, the downstream end of the branch pipe portion 28B is parallel to the downstream end of the straight pipe portion 28A.

[0031] The downstream end of the straight pipe portion 28A is provided with a pipe connection portion 29A. The downstream end of the branch pipe portion 28B is provided with a pipe connection portion 29B.

[0032] The upstream end of the first lateral draw-off pipe 31A is connected to the pipe connection portion 29A of the straight pipe portion 28A in the branch joint 28. The downstream end of the first lateral draw-off pipe 31A is connected to the pipe connection portion 49B of the branch pipe portion 48B in a merging joint 48 described later.

[0033] The upstream end of the first lateral draw-off pipe 31B is connected to the pipe connection portion 49B of the branch pipe portion 28B in the branch joint 28. The downstream end of the first lateral draw-off pipe 31B is connected to the pipe connection portion 49A of the straight pipe portion 48A in a merging joint 48 described later.

[0034] As shown in FIGS. 2 and 3, the first horizontal drain pipes 31A and 31B are pipes arranged substantially parallel to each other in the horizontal direction, for example, along the slab 14. The first horizontal drain pipes 31A and 31B are connected to the downstream side of the branch joint 28 and are horizontal pipes that drain the wastewater discharged from the temporary storage tank 30 laterally. The first horizontal drain pipes 31A and 31B are formed of, for example, polybutene pipes with a nominal diameter of 25J (inner diameter of about 28 mm) and are arranged horizontally without a slope on the slab 14. Here, the term "without a slope" does not necessarily mean strictly horizontal and includes those with some steps or slopes along the slab 14. The upstream end of the first horizontal drain pipe 31A is connected to the downstream end of the straight pipe portion 28A of the branch joint 28. The upstream end of the first horizontal drain pipe 31B is connected to the downstream end of the branch pipe portion 28B of the branch joint 28. Note that the two first horizontal drain pipes 31A and 31B do not necessarily have to be parallel to each other depending on the conditions of the installation location.

[0035] As shown in FIGS. 4 and 7, a confluence joint 48, which is an example of a confluence section, combines the first horizontal drain pipes 31A and 31B into one.

[0036] The confluence joint 48 includes a plurality (two in this embodiment) of pipe connection parts 49A and 49B to which the upstream ends of the first horizontal pipes 31A and 31B are respectively connected. The plurality of pipe connection parts 49A and 49B are located at different positions in the drainage outflow direction (the direction indicated by the arrow F2 in the figure) of the confluence joint 48. Here, the drainage outflow direction in the confluence joint 48 is the direction in which drainage flows out with respect to the confluence joint 48. In this embodiment, it is the direction in which drainage flows out from the confluence joint 48 to the second horizontal pipe 44, and is the same direction as the pipe axis direction (central axis direction) of the second horizontal pipe 44. Further, as shown in FIG. 3, the drainage outflow direction F2 in this embodiment is the same direction as the drainage inflow direction F1 in plan view. Note that the present invention is not limited to this configuration, and the drainage outflow direction F2 may be slightly inclined with respect to the drainage inflow direction F1. In this embodiment, as shown in FIG. 5, the pipe connection part 49B is located downstream of the pipe connection part 29A. Further, a part of the outer peripheries of the pipe connection parts 49A and 49B overlap each other in the drainage outflow direction F2. In other words, when viewed from the drainage outflow direction F2, a part of the outer peripheries of the pipe connection parts 49A and 49B overlap each other in the drainage outflow direction F2.

[0037] Further, the confluence joint 48 includes a straight pipe part 48A and a branch pipe part 48B. The downstream end of the first horizontal pipe 31A is connected to the straight pipe part 48A by the pipe connection part 49A. Also, the upstream end of the second horizontal pipe 44 is connected to the straight pipe part 48A. This straight pipe part 48A extends linearly along the drainage outflow direction F2. Further, the branch pipe part 48B has a branch part 48C that branches from the middle of the straight pipe part 48A and extends obliquely with respect to the pipe axis direction of the straight pipe part 48A.

[0038] The straight pipe part 48A and the branch pipe part 48B intersect at an acute angle on the upstream side at the branch point. The branch pipe part 48B is bent in the middle. Thereby, the upstream end of the branch pipe part 48B is made parallel to the upstream end of the straight pipe part 48A.

[0039] The upstream end of the straight pipe part 48A includes the pipe connection part 49A. Also, the upstream end of the branch pipe part 48B includes the pipe connection part 49B.

[0040] The second horizontal drain pipe 44 is, for example, a pipe arranged along the slab 14, connected to the downstream side of the confluence joint 48, and discharges the confluent drainage laterally. The upstream end of this second horizontal drain pipe 44 is connected to the pipe connection part of the straight pipe part 48A in the confluence joint 48. Further, the second horizontal drain pipe 44 is formed of, for example, a rigid polyvinyl chloride pipe with a nominal diameter of 30A (inner diameter of 30 mm) and is arranged horizontally and without slope along the slab 14.

[0041] The vertical pipe 46 is connected to the downstream side of the second horizontal drain pipe 44 and is a part that generates siphon force in the first horizontal drain pipes 31A and 31B and the second horizontal drain pipe 44 by allowing the drainage to flow down. The vertical pipe 46 is, for example, a rigid polyvinyl chloride pipe with a nominal diameter of 25A (inner diameter of 25 mm). The vertical pipe 46 is arranged along the drainage riser 22, for example, in the vertical direction (up and down). The downstream end of the vertical pipe 46 reaches the confluence joint 26. The confluence joint 26 is a pipe joint that joins the drainage from the vertical pipe 46 to the drainage riser 22. The length from the confluence joint 48 to the vertical pipe 46 may be, for example, 500 to 1000 mm. The confluence joint 48, which is the confluence part, is not a meter box outside the wall 18 but is located, for example, inside the wall 18, that is, on the household side.

[0042] The dropping part located at the boundary between the second horizontal drain pipe 44 and the vertical pipe 46 is shown as a continuous vent pipe, but pipe joints such as elbows may be arranged in this vent pipe part. When arranging a pipe joint here, an inspection port or the like can be appropriately provided in the pipe joint. The dropping part from the second horizontal drain pipe 44 to the vertical pipe 46 is arranged, for example, inside a meter box outside the wall 18 of the household.

[0043] A vent pipe 50 is further connected to the temporary storage tank 30, and the vent pipe 50 reaches the confluence joint 26.

[0044] Let the cross-sectional area of the outlet 30A in the temporary storage tank 30 be A1, the total cross-sectional area of the first horizontal pipes 31A and 31B be A2, the cross-sectional area of the second horizontal pipe 44 be A3, and the cross-sectional area of the vertical pipe 46 be A4. Then, the relationship A1 > A2 > A3 > A4 is satisfied. When calculating the cross-sectional area from the inner diameters of the above-mentioned pipes, A1 ≒ 2206 mm 2 , A2 ≒ 1240 mm 2 , A3 ≒ 707 mm 2 , A4 ≒ 491 mm 2 and the above relationship is satisfied.

[0045] In addition, when the cross-sectional area of the flow path is not constant, the cross-sectional area of the flow path means the average cross-sectional area. The cross-sectional area A1 of the outlet 30A means the average cross-sectional area of the outlet portion where the cross-sectional area is substantially constant. In FIGS. 6 and 7, the cross-sectional areas A1 to A4 are illustrated at the positions of the inner diameters, but the sizes of the inner diameters of the respective pipes in the drawings do not necessarily correspond to the sizes of the inner diameter dimensions of the above-mentioned pipes.

[0046] Note that the branch joint 28 and the confluence joint 48 of the present embodiment are each an example of the pipe joint in the present invention. That is, the pipe connection portions 29A and 49A of the present embodiment are each an example of the first pipe connection portion in the present invention, and the pipe connection portions 29B and 49B of the present embodiment are each an example of the second pipe connection portion in the present invention. Further, the reduced-diameter joint 34 and the second horizontal pipe 44 of the present embodiment are each an example of the first tubular body in the present invention, and the first horizontal pipes 42A and 42B are each an example of the second tubular body in the present invention. When the reduced-diameter joint 34 is not used, the cylindrical portion constituting the outlet 30A becomes an example of the first tubular body. Furthermore, the flow direction of the fluid (waste water) in the present invention is the waste water inflow direction F1 in the case of the branch joint 28 and the waste water outflow direction F2 in the case of the confluence joint 48.

[0047] (Function) This embodiment is configured as described above, and its operation will be described below. In the piping structure 20 according to this embodiment, by draining water from the temporary storage tank 30 through the first horizontal pipes 31A and 31B, a larger drainage treatment volume can be ensured compared to a configuration where only one horizontal pipe is connected. As a result, it is possible to suppress the overflow of drainage in the plumbing fixture 12 located upstream of the temporary storage tank 30. Even if a large amount of drainage flows from the bathtub 12A at once, the drainage is processed by the first horizontal pipes 31A and 31B, so the drainage is quickly discharged.

[0048] Since the drainage flowing through the first horizontal pipes 31A and 31B merges into one at the junction 48, the flow rate of the second horizontal pipe 44 increases, and it is possible to quickly cause a full flow in the drop section from the second horizontal pipe 44 to the vertical pipe 46. As a result, the siphon generation time can be shortened. In particular, since the relationship between the flow path cross-sectional areas of each part of the piping structure 20 is set such that A1 > A2 > A3 > A4, the flow rate of the second horizontal pipe 44 can be increased, and a full flow can be quickly generated in the drop section from the second horizontal pipe 44 to the vertical pipe 46. As a result, the siphon generation time can be further shortened.

[0049] Also, even if dirt accumulates or foreign objects clog one of the first horizontal pipes 31A or 31B, drainage can be discharged from the other of the first horizontal pipes 31A or 31B, so the risk of drainage failure can be reduced.

[0050] Furthermore, by using a pipe body with a nominal diameter of 25J, which is a common size, as the first horizontal pipes 31A and 31B, conventional products can be used as piping fixtures and the like.

[0051] Also, when the second horizontal pipe 44 and the vertical pipe 46 are made of rigid polyvinyl chloride pipes, the piping structure can be configured at a lower cost compared to a configuration using polybutene pipes for the second horizontal pipe 44 and the vertical pipe 46.

[0052] In the piping structure 20, since the temporary storage tank 30 and the first lateral pipes 31A and 31B are connected via the branch joint 28, for example, compared with a configuration in which the first lateral pipes 31A and 31B are directly connected to the temporary storage tank 30, the structure around the outlet 30A of the temporary storage tank 30 can be simplified. Specifically, since it is not necessary to provide outlets for the first lateral pipes 31A and 31B in the temporary storage tank 30, the structure around the outlet 30A of the temporary storage tank 30 is simple, and furthermore, the formability of the temporary storage tank 30 is improved.

[0053] In the piping structure 20, the positions of the piping connection parts 29A and 29B of the branch joint 28 in the drainage inflow direction F1 are different from each other, and a part of the outer peripheries of the piping connection parts 29A and 29B overlap each other in the drainage inflow direction F1. For this reason, for example, the piping connection parts 29A and 29B do not overlap in the drainage inflow direction F1. In other words, compared with a configuration in which the piping connection parts 29A and 29B are separated in a direction orthogonal to the drainage inflow direction F1, the size of the branch joint 28 can be reduced. Also, the positions of the piping connection parts 49A and 49B of the confluence joint 48 in the drainage outflow direction F2 are different from each other, and a part of the outer peripheries of the piping connection parts 49A and 49B overlap each other in the drainage outflow direction F2. For this reason, for example, the piping connection parts 49A and 49B do not overlap in the drainage outflow direction F2. In other words, compared with a configuration in which the piping connection parts 49A and 49B are separated in a direction orthogonal to the drainage outflow direction F2, the size of the confluence joint 48 can be reduced.

[0054] Also, the distance between the first lateral pipes 31A and 31B, which are respectively connected to the piping connection parts 29A and 29B of the branch joint 28 and the piping connection parts 49A and 49B of the confluence joint 48, can be reduced. Thereby, the arrangement pitch of the first lateral pipes when laying the first lateral pipes 31A and 31B can be narrowed, and the design freedom during construction is improved.

[0055] Also, the drainage water in the temporary storage tank 30 flows into the first horizontal pipe 31A through the straight pipe portion 28A of the branch joint 28 and into the first horizontal pipe 31B through the branch pipe portion 28B. Here, in the straight pipe portion 28A of the branch joint 28, since the drainage water in the temporary storage tank 30 flows linearly, the decrease in the flow velocity is small, and a full flow can be quickly generated in the portion between the confluence joint 48 and the vertical pipe 46, specifically, in the dropping portion from the second horizontal pipe 44 to the vertical pipe 46. Thereby, the siphon generation time can be shortened.

[0056] In the piping structure 20, the drainage water flows from the straight pipe portion 28A of the branch joint 28 to the branch pipe portion 48B of the confluence joint 48 through the first horizontal pipe 31A. Also, the drainage water flows from the branch pipe portion 28B of the branch joint 28 to the straight pipe portion 48A of the confluence joint 48 through the first horizontal pipe 31B. Therefore, the difference in the flow velocity generated at the branch joint 28 is offset at the confluence joint 48. Thereby, the flow bias in the first horizontal pipes 31A and 31B is suppressed, and the drainage water can be quickly flowed to the dropping portion from the second horizontal pipe 44 to the vertical pipe 46.

[0057] And, in the piping structure 20, since a part of the outer periphery of the pipe connection portions 29A and 29B overlaps with each other in the drainage inflow direction F1, the angle between the axial direction of the straight pipe portion 28A and the axial direction of the branch pipe portion 28B can be made small, so that the drainage resistance in the branch pipe portion 28B can be reduced. Also, since a part of the outer periphery of the pipe connection portions 49A and 49B overlaps with each other in the drainage outflow direction F2, the angle between the axial direction of the straight pipe portion 48A and the axial direction of the branch pipe portion 48B can be made small, so that the drainage resistance in the branch pipe portion 48B can be reduced.

[0058] As described above, according to the present embodiment, in the structure in which a plurality of siphon drain pipes are provided in the temporary storage tank 30, it is possible to shorten the siphon force generation time while ensuring the drainage treatment amount.

[0059] [Other Embodiments] As described above, an example of an embodiment of the present invention has been explained. However, the embodiments of the present invention are not limited to the above, and it goes without saying that various modifications can be made without departing from the gist of the present invention other than the above.

[0060] In addition, in the above-described embodiment, as shown in FIG. 4, the pipe connection portion 29A is located downstream of the pipe connection portion 29B. However, the present invention is not limited to this configuration. As shown in FIG. 8, the pipe connection portion 29B may be located downstream of the pipe connection portion 29A. Similarly, for the confluence joint 48, the pipe connection portion 49B may be located upstream of the pipe connection portion 49A.

[0061] In addition, in the above-described embodiment, the branch joint 28 has a configuration including the straight pipe portion 28A and the branch pipe portion 28B. However, the branching form of the branch joint 28 is not limited to this, and any form can be adopted. For example, as shown in FIGS. 9 to 12, a Y-shaped branch joint 68 may be used. This branch joint 68 includes an upstream main pipe portion 68A and branch pipe portions 68B and 68C that branch into two branches. The outlet 30A is connected to the main pipe portion 68A. Pipe connection portions 69A and 69B are respectively connected to the downstream ends of the branch pipe portions 68B and 68C. The positions of the pipe connection portions 69A and 69B in the drainage inflow direction F1 are different from each other. Specifically, the pipe connection portion 69B is located downstream of the pipe connection portion 69A. In addition, the upstream end of the first lateral draw pipe 31A is connected to the pipe connection portion 69A, and the upstream end of the first lateral draw pipe 31B is connected to the pipe connection portion 69B. The confluence joint 78 includes a downstream main pipe portion 78A and branch pipe portions 78B and 78C that branch into two branches. The second lateral draw pipe 44 is connected to the main pipe portion 78A. Pipe connection portions 79B and 79A are respectively connected to the upstream ends of the branch pipe portions 78B and 78C. The positions of the pipe connection portions 79A and 79B in the drainage outflow direction F2 are different from each other. Specifically, the pipe connection portion 79B is located downstream of the pipe connection portion 79A. In addition, the downstream end of the first lateral draw pipe 31A is connected to the pipe connection portion 79A, and the downstream end of the first lateral draw pipe 31B is connected to the pipe connection portion 79B. Even if the shape of the branch joint and the shape of the confluence joint are changed in this way, the same effects as those of the above-described embodiment can be obtained.

[0062] Also, in the above-described embodiment, the first horizontal pipes 31A and 31B are connected to the outlet 30A via the reducer 34 and the branch joint 28. However, the present invention is not limited to this configuration. The first horizontal pipes 31A and 31B may be directly connected to the temporary storage tank 30 without providing the reducer 34 and the branch joint 28.

Explanation of Reference Numerals

[0063] 20... piping structure, 22... drain riser, 28... branch joint, 30... temporary storage tank, 30A... outlet, 31A... first horizontal pipe, 31B... first horizontal pipe, 44... second horizontal pipe, 46... vertical pipe, 48... confluence joint (confluence section), 50... vent pipe

Claims

1. A plurality of first lateral drain pipes connected via a branch joint to the downstream side of a temporary storage tank provided in a drainage system for discharging the drainage discharged from the temporary storage tank laterally; A confluence section for merging the plurality of first lateral drain pipes into one; A second lateral drain pipe connected to the downstream side of the confluence section for discharging the merged drainage laterally; A vertical pipe connected to the downstream side of the second lateral drain pipe for generating siphon force in the first lateral drain pipe and the second lateral drain pipe by allowing the drainage to flow down; Comprising; The branch joint includes a plurality of pipe connection parts to which the upstream ends of the plurality of first lateral drain pipes are respectively connected; The plurality of pipe connection parts are different in position in the drainage inflow direction in the branch joint and a part of the outer periphery of adjacent ones overlaps in the drainage inflow direction; The inner diameter of the first lateral drain pipe is smaller than the inner diameter of the second lateral drain pipe; When the flow path cross-sectional area of the outlet of the temporary storage tank is A1, the total flow path cross-sectional area of the plurality of first lateral drain pipes is A2, the flow path cross-sectional area of the second lateral drain pipe is A3, and the flow path cross-sectional area of the vertical pipe is A4, a piping structure satisfying the relationship A1 > A2 > A3 > A4.

2. The confluence section is a confluence joint; The confluence joint includes a plurality of pipe connection parts to which the downstream ends of the plurality of first lateral drain pipes are respectively connected; The plurality of pipe connection parts are different in position in the drainage outflow direction in the confluence joint and a part of the outer periphery of adjacent ones overlaps in the drainage inflow direction, the piping structure according to Claim 1.

3. The branch joint is connected to the temporary storage tank and has a straight pipe portion extending linearly and a branch pipe portion branching from the middle of the straight pipe portion and extending obliquely with respect to the axial direction of the straight pipe portion; The piping structure according to Claim 1 or Claim 2, comprising the pipe connection parts at the downstream end of the straight pipe portion and the downstream end of the branch pipe portion respectively.

4. The confluence joint has a straight pipe portion extending linearly and a branch pipe portion branching from the middle of the straight pipe portion and extending obliquely with respect to the axial direction of the straight pipe portion; The pipe connection parts are provided at the upstream end of the straight pipe portion and the upstream end of the branch pipe portion respectively, The downstream end of the first lateral drain pipe connected to the straight pipe portion of the branch joint is connected to the straight pipe portion of the confluence joint, the piping structure according to Claim 3 citing Claim 2.

Images