Piping coupling, drain piping system, and building

Abstract

To provide a piping coupling with improved rain water flowing property into a vertical pipe and drainage property.SOLUTION: A piping coupling 3 comprises: a pipe main body 22; a horizontal pipe connection part 23 that is formed on the pipe main body 22 and connected to a horizontal pipe 6; a vertical pipe connection part 24 that is formed under the pipe main body 22 and allows a vertical pipe 7 to be connected thereto; and a rectification member 28 provided inside the pipe main body 22.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a pipe fitting, a drainage piping system, and a building. [Background technology]

[0002] In recent years, with the increasing frequency of heavy rainfall, there has been a trend toward larger rainwater pipes in order to improve the efficiency of draining rainwater from buildings. For example, in the drainage piping system for the rooftop floor of a building shown in Figure 46, a frame-type roof drain 302 is installed along the part where a spandrel wall 301 is erected at the corner of a building rooftop floor 300. A horizontal pipe 303 connected to this roof drain 302 is installed so as to penetrate horizontally through the spandrel wall 301. A drainage vertical pipe 306 is connected to the outer end of the horizontal pipe 303 via an elbow pipe 305 (see, for example, Non-Patent Document 1).

[0003] In a drainage piping system for the rooftop of a building, as shown in Figure 47, a drainage piping system is known in which a tee joint 307 is provided at the connection between a horizontal pipe 303 and a vertical pipe 306 instead of an elbow pipe 305. A removable cover plate 308 is provided on the ceiling of the tee joint 307. Alternatively, as shown in Figure 48, there is known a drainage piping system in which a drainage manhole 309 is provided at the connection between a horizontal pipe 303 and a vertical pipe 306 instead of an elbow pipe 305. A removable cover plate 310 is provided on the ceiling of the drainage manhole 309. [Prior art documents] [Non-patent literature]

[0004] [Non-Patent Document 1] Kaneso Co., Ltd. "Product Information: Cast Iron Roof Drain, Waterproofing Layer Width 100mm, Horizontal Pull, Drive-in Type," [online], [Retrieved September 27, 2021], Internet (URL http: / / www.kaneso.co.jp / seihin / WHXA.htm) Summary of the Invention [Problem to be solved by the invention]

[0005] In the drainage piping system shown in FIG. 46, rainwater on the roof is introduced into a horizontal pipe 303 via a roof drain 302, and is drained by flowing into a vertical pipe 306 via an elbow pipe 305. In a typical drainage piping system, the horizontal pipe 303 and the vertical pipe 306 are designed to have the same diameter, but in consideration of countermeasures against recent sudden heavy rains, there is a trend to increase the diameter of both the horizontal pipe 303 and the vertical pipe 306 in order to improve drainage capacity.

[0006] However, increasing the diameter of standpipes to protect against heavy rainfall increases the weight of the pipes in buildings with many floors. This poses the problem of requiring a stronger support structure to withstand the weight of the pipes and to withstand wind force, etc. Various other effects are also anticipated, such as an increase in the number of pipe support points using support fittings, the need for stronger support fittings, and in some cases, a need to reconsider the strength of the building structure. Furthermore, there are concerns that this could have various effects on the design and construction of buildings, such as the need to secure storage space for large-diameter standpipes, the need for larger heavy transport equipment, and the need for more labor.

[0007] The present invention has been made in consideration of such problems, and aims to provide a piping joint that improves the inflow and drainage of rainwater into a vertical pipe, and a drainage piping system equipped with this piping joint. [Means for solving the problem]

[0008] In order to solve the above problems, the present invention proposes the following means. The piping joint of the present invention is characterized by comprising a pipe main body portion, a horizontal pipe connection portion formed on the pipe main body portion and connected to a horizontal pipe, a vertical pipe connection portion formed at the bottom of the pipe main body portion and connected to a vertical pipe, and a straightening member provided inside the pipe main body portion. In this invention, rainwater that flows into the pipe main body through the horizontal pipe connector connected to the horizontal pipe is stabilized inside the pipe main body by the flow straightening member installed inside the pipe main body. Because the standpipe is connected downstream of the pipe main body, the inflow and drainage of rainwater into the standpipe can be improved.

[0009] In the piping joint, the inner diameter of the vertical pipe connecting portion may be smaller than the inner diameter of the horizontal pipe connecting portion. In this invention, even if the diameter of the horizontal pipe is increased to prepare for sudden heavy rain, for example, the inner diameter of the vertical pipe connection part is made smaller than the inner diameter of the horizontal pipe connection part, so that a vertical pipe with a smaller inner diameter can be connected. Even if the diameter of the horizontal pipe becomes larger and the amount of rainwater flowing from the horizontal pipe into the vertical pipe increases, gravity acts on the rainwater flowing in the vertical pipe, causing it to be discharged faster than the rainwater flowing in the horizontal pipe, so there is no problem with drainage capacity. Even if the diameter of the horizontal pipes is increased to protect against sudden heavy rain, the diameter of the vertical pipes can be reduced, which eliminates the need to increase the strength of the metal fittings that support the vertical pipes. Furthermore, the number of supporting metal fittings required can be reduced. Furthermore, by reducing the diameter of the vertical pipes, the load on the building structure can be reduced. In addition, since large diameter vertical pipes are no longer used, the storage space for large diameter vertical pipes can be reduced, contributing to the miniaturization of heavy transport equipment, and a structure can be provided that does not impose a burden on the design and construction of buildings.

[0010] The piping joint may also include an opening formed in an upper portion of the pipe main body, and a first cover member detachably attached to the opening. In this invention, for example, if foreign matter or the like accumulates inside the pipe main body or becomes clogged with foreign matter, the first cover member can be removed to clean the inside of the pipe main body or the like, thereby providing a piping fitting with excellent maintainability.

[0011] The piping joint may also include a water flow guide slope formed on the lower part of the first cover member and inclined with respect to both the central axis of the horizontal pipe connection portion and the central axis of the vertical pipe connection portion. In this invention, the flow of rainwater that flows into the inside of the pipe body from the horizontal pipe hits the water flow guide slope and changes direction, allowing it to smoothly change direction and be introduced into the vertical pipe side, thereby smoothing the flow of rainwater inside the pipe body.

[0012] The piping joint may further include a flow rectifying plate provided on the first cover member and protruding toward the inside of the pipe main body. In this invention, the flow of rainwater flowing from the pipe main body to the standpipe connection part can be made smooth by the flow straightening plate.

[0013] The piping joint may further include a reduced diameter portion disposed between the pipe main body portion and the standpipe connecting portion. In this invention, rainwater flowing from the pipe main body toward the standpipe can be smoothly guided by the reduced diameter portion.

[0014] The piping joint may further include a flow rectifying plate protruding from the inner surface of the pipe main body. In this invention, the flow of rainwater flowing from the pipe main body to the standpipe connection part can be made smooth by the flow straightening plate.

[0015] In the piping joint, the standpipe connecting portion may be disposed eccentrically with respect to the pipe main body portion. In this invention, for example, the standpipe can be installed closer to or farther from the exterior wall located near the piping joint. If the standpipe can be installed closer to the exterior wall, the wind pressure acting on the standpipe can be reduced, and the burden caused by wind pressure on the support structure of the standpipe will be reduced.

[0016] The piping joint may further include a second standpipe connecting portion formed on an upper portion of the pipe main body and to which a second standpipe is connected. In this invention, by having the second standpipe connecting portion, for example, the piping joint (pipe main body) can be a tee joint of a known configuration, and the cost required for installing the piping joint can be reduced.

[0017] The piping joint may further include a bottom plate provided inside the pipe main body. In this invention, the bottom plate can be used to install various components, for example, inside the pipe main body.

[0018] The drainage piping system of the present invention is also characterized by comprising a roof drain installed on the roof floor of a building, a horizontal pipe connected to the roof drain and passing through the waist wall of the roof floor of the building, a piping fitting described in any of the above, in which the horizontal pipe connection part is connected to the outer end of the horizontal pipe, and the vertical pipe connected to the vertical pipe connection part. In this invention, a drainage piping system can be constructed that treats rainwater flowing from a roof drain into a horizontal pipe using a piping joint that improves the inflow and drainage of rainwater into a vertical pipe.

[0019] In addition, in the drainage piping system, the piping fitting may include a second upright pipe connection portion formed on the upper part of the pipe main body portion and to which a second upright pipe is connected, the second upright pipe connected to the second upright pipe connection portion, and a second cover member removably attached to the second upright pipe. In this invention, if foreign matter accumulates inside the pipe main body or becomes clogged with foreign matter, the second cover member, which is located relatively far from the pipe main body by the second standpipe, can be removed and the inside of the piping joint can be cleaned through the second standpipe, thereby providing a drainage piping system with excellent maintainability. [Effects of the Invention]

[0020] The piping joint and drainage piping system of the present invention can improve the inflow and drainage of rainwater into the standpipe. [Brief explanation of the drawings]

[0021] [Figure 1] 1 is a cross-sectional view showing an example of a building to which a drainage piping system according to a first embodiment of the present invention is applied. [Figure 2] FIG. 2 is an exploded cross-sectional view of the main parts of the drainage piping system. [Figure 3] FIG. 4 is a perspective view of a first connecting member in the drainage piping system. [Figure 4] FIG. 2 is a perspective view of a siphon activation member in the drainage piping system. [Figure 5] FIG. 2 is a cross-sectional view showing an example of a building to which a drainage piping system according to a first modified example of the first embodiment of the present invention is applied. [Figure 6] FIG. 2 is an exploded perspective view of the reducing socket and the siphon activation member in the drainage piping system. [Figure 7] FIG. 10 is a perspective view of the reducing socket and the siphon activation member in an assembled state. [Figure 8] FIG. 4 is a cross-sectional view showing an example of a building to which a drainage piping system according to a second embodiment of the present invention is applied. [Figure 9] FIG. 2 is an exploded cross-sectional view of the main parts of the drainage piping system. [Figure 10] FIG. 10 is an exploded cross-sectional view of a main part of a drainage piping system according to a first modified example of the second embodiment of the present invention. [Figure 11] FIG. 10 is an exploded cross-sectional view of a main part of a drainage piping system according to a second modified example of the second embodiment of the present invention. [Figure 12] FIG. 10 is an exploded cross-sectional view of a main part of a drainage piping system according to a third modified example of the second embodiment of the present invention. [Figure 13] FIG. 10 is an exploded cross-sectional view of a main part of a drainage piping system according to a fourth modified example of the second embodiment of the present invention. [Figure 14] FIG. 2 is a plan view of the main parts of the drainage piping system. [Figure 15] FIG. 10 is a plan view of a main part of a drainage piping system according to a fourth modified example of the second embodiment of the present invention. [Figure 16] FIG. 10 is a plan view of a main part of a drainage piping system according to a fourth modified example of the second embodiment of the present invention. [Figure 17] FIG. 10 is an exploded cross-sectional view of a main part of a drainage piping system according to a fifth modified example of the second embodiment of the present invention. [Figure 18]FIG. 10 is an exploded cross-sectional view of a main part of a drainage piping system according to a sixth modified example of the second embodiment of the present invention. [Figure 19] FIG. 10 is a cross-sectional view of a drainage piping system according to a seventh modified example of the second embodiment of the present invention. [Figure 20] FIG. [Figure 21] FIG. 10 is a cross-sectional view of a drainage piping system according to an eighth modified example of the second embodiment of the present invention. [Figure 22] FIG. 13 is a cross-sectional view of a drainage piping system according to a ninth modified example of the second embodiment of the present invention. [Figure 23] FIG. 20 is a cross-sectional view of a drainage piping system according to a tenth modified example of the second embodiment of the present invention. [Figure 24] FIG. 13 is a partial cross-sectional view showing an example of a building to which the drainage piping system according to the eleventh modified example of the second embodiment of the present invention is applied. [Figure 25] FIG. 10 is a cross-sectional view showing an example of a building to which a drainage piping system according to a third embodiment of the present invention is applied. [Figure 26] FIG. 2 is a perspective view of a piping joint provided in the drainage piping system. [Figure 27] FIG. 2 is a perspective view showing a cross section of a main part of the piping joint. [Figure 28] FIG. 2 is a cross-sectional view showing the internal structure of the piping joint. [Figure 29] FIG. 29 is a cross-sectional view taken along the line A1-A1 shown in FIG. 28. [Figure 30] 4 is an explanatory diagram showing the positional relationship of a standpipe connecting portion with respect to a pipe main body portion in the piping joint. FIG. [Figure 31] FIG. 11 is an explanatory view showing the positional relationship of a standpipe connecting portion with respect to a pipe main body portion in a piping joint according to a first modified example of the third embodiment of the present invention. [Figure 32] 13 is an explanatory view showing the positional relationship of a standpipe connecting portion with respect to a pipe main body portion in a piping joint according to a second modified example of the third embodiment of the present invention. FIG. [Figure 33] FIG. 10 is a partial cross-sectional view of a piping joint according to a third modified example of the third embodiment of the present invention. [Figure 34]FIG. [Figure 35] FIG. 11 is a partially see-through perspective view of a piping joint according to a fourth modified example of the third embodiment of the present invention. [Figure 36] FIG. 10 is a cross-sectional view showing an example of a building to which a drainage piping system according to a fourth embodiment of the present invention is applied. [Figure 37] 10 is an exploded perspective view of a reducing socket and a siphon activation member used in the piping joint. FIG. [Figure 38] FIG. 10 is a perspective view of the reducing socket and the siphon activation member in an assembled state. [Figure 39] FIG. 10 is a cross-sectional view showing an example of a building to which a drainage piping system according to a first modified example of the fourth embodiment of the present invention is applied. [Figure 40] FIG. 2 is a partially cutaway perspective view of a piping joint of the drainage piping system. [Figure 41] FIG. 41 is a cross-sectional view taken along the line A2-A2 shown in FIG. [Figure 42] FIG. 10 is a perspective view showing an outline of a verification test conducted to verify the influence depending on the length of the horizontal pipe. [Figure 43] FIG. 1 is an explanatory diagram showing the configuration of a verification test device equipped with a horizontal pipe having a length of 0.3 m. [Figure 44] FIG. 1 is an explanatory diagram showing the configuration of a verification test device equipped with a horizontal pipe having a length of 1.0 m. [Figure 45] 21 is a graph showing test results obtained by the verification test device shown in FIGS. 19 and 20. [Figure 46] FIG. 1 is a configuration diagram showing a first conventional example of a drainage piping system. [Figure 47] FIG. 10 is a configuration diagram showing a second conventional example of a drainage piping system. [Figure 48] FIG. 10 is a configuration diagram showing a third conventional example of a drainage piping system. DETAILED DESCRIPTION OF THE INVENTION

[0022] (First embodiment) A first embodiment of a piping joint and a drainage piping system according to the present invention will be described below with reference to FIGS. 1 to 7. FIG. A drainage piping system including a piping joint according to this embodiment is applied to drainage of buildings such as buildings and apartment buildings, for example. The piping joint 3 of the first embodiment shown in Fig. 1 is provided on the outside of the connection between the rooftop floor (a floor constituting the roof) 1 of a building 1A and a waist wall 2 erected at a corner of the rooftop floor 1. The waist wall 2 is a waist wall of the rooftop floor of the building 1A. A frame-type roof drain 5 is provided inside the joint between the rooftop floor 1 and the waist wall 2. A horizontal pipe 6 that passes horizontally through the waist wall 2 is connected to this roof drain 5. A piping joint 3 is connected to the outer end of the horizontal pipe 6. A vertical pipe 7 is connected to the lower part of the piping joint 3. In the first embodiment, the drainage piping system S1 is configured to include a roof drain 5, a horizontal pipe 6, a piping joint 3, a vertical pipe 7, a second vertical pipe 36 described later, and a second cover member 37. The standpipe 7 extends downward along the outer wall 8 of the building 1A. The standpipe 7 is connected to drainage equipment such as a catch basin or other drainage pipe (not shown) provided on the ground near the building 1A.

[0023] The roof drain 5 has an L-shaped frame 12 made up of a bottom plate 10 and a side plate 11. A tubular member 13 for connecting piping is integrated with the frame 12. A through hole 11a is formed on the bottom side of the side plate 11. The tubular member 13 extends outward from the side plate 11 so as to extend outward from this through hole 11a. The bottom plate 10 is installed in the corner of the rooftop floor 1, and the side plate 11 is in close contact with the bottom of the waist wall 2. The roof drain 5 is installed in the corner of the rooftop floor 1 of the building 1A. At this time, the tubular member 13 is inserted into a through hole 2a formed in the bottom of the waist wall 2. An L-shaped frame-shaped strainer 17 with multiple water passage holes is detachably attached to the inside of the frame body 12 with bolts 18 and nuts 19. The frame body 12 and the strainer 17 form the roof drain 5.

[0024] The end of the waterproof sheet 15 on the roof floor 1 side is sandwiched and held down between the bottom plate 10 of the roof drain 5 and the bottom of the strainer 17. Similarly, the end of the waterproof sheet 16 on the waist wall 2 side is sandwiched and held down between the side plate 11 and the upper part of the strainer 17. The roof drain 5 used in this embodiment is just one example. The structure of the roof drain used in the present invention may be any roof drain of a general structure, such as a general frame type or box type.

[0025] The horizontal pipe 6 is for drainage. The horizontal pipe 6 extends along a horizontal plane with an appropriate water gradient. A longitudinal portion of the horizontal pipe 6 is disposed within the through-hole 2a in the waist wall 2. A first end of the horizontal pipe 6 is connected to the tubular member 13 of the roof drain 5. A second end of the horizontal pipe 6 opposite the first end protrudes outside the through-hole 2a. The horizontal pipe 6 penetrates the waist wall 2. The horizontal pipe 6 is formed from polyvinyl chloride resin or the like.

[0026] 1 and 2, the piping joint 3 includes a pipe main body 22, a horizontal pipe connecting portion 23, a standpipe connecting portion 24, a second standpipe connecting portion 25, a first connecting member 26, a second connecting member 27, and a siphon activation member (flow straightening member) 28. The pipe main body 22, the horizontal pipe connecting portion 23, the standpipe connecting portion 24, and the second standpipe connecting portion 25 constitute a joint main body 30. In FIG. 2, the socket 33 and the standpipe 7 are indicated by two-dot chain lines. The piping joint 3 may also be a piping manhole member. The pipe main body 22 is a T-shaped, so-called cheese pipe. The pipe main body 22 is configured by providing a connecting portion, which is an opening that communicates with the inside of the straight pipe portion, on the side of a straight pipe portion that is a circular pipe. The pipe main body 22 is installed outside the waist wall 2 so that the central axis of the straight pipe portion is aligned vertically. When installing the pipe main body 22, it is acceptable to install the central axis of the straight pipe portion so that it is slightly inclined from the vertical direction.

[0027] The horizontal pipe connecting portion 23, the vertical pipe connecting portion 24, and the second vertical pipe connecting portion 25 are each cylindrical. The horizontal pipe connecting portion 23 is formed coaxially with the connecting portion of the pipe main body portion 22. The second end of the horizontal pipe 6 is disposed within the horizontal pipe connecting portion 23. The horizontal pipe connecting portion 23 and the horizontal pipe 6 are bonded to each other, for example, so that the horizontal pipe connecting portion 23 is connected to the outer end side of the horizontal pipe 6. The standpipe connecting portion 24 is formed coaxially with the straight pipe portion below the straight pipe portion of the pipe main body portion 22. The inner diameter of the standpipe connecting portion 24 is larger than the inner diameter of the straight pipe portion. The second standpipe connecting portion 25 is formed on the upper part of the straight pipe portion of the pipe main body portion 22. The inner diameter of the second standpipe connecting portion 25 is larger than the inner diameter of the straight pipe portion. In this example, the second standpipe connecting portion 25 has the same shape as the standpipe connecting portion 24.

[0028] The pipe main body 22, horizontal pipe connection portion 23, vertical pipe connection portion 24, and second vertical pipe connection portion 25 that make up the fitting main body 30 are integrally formed by injection molding resins such as olefin resins such as PE (polyethylene), PP (polypropylene), or PB (polybutene), rigid polyvinyl chloride resin, ABS (acrylonitrile-butadiene-styrene copolymer resin), and AES (acrylonitrile-ethylene-styrene copolymer resin). The joint body 30 configured as described above is a known (existing) cheese-type joint in the pipe body portion 22 that is perpendicular to the central axis of the straight pipe portion and plane-symmetrical with respect to a reference plane passing through the central axis of the connection portion.

[0029] As shown in FIGS. 2 and 3, the first connecting member 26 has a first flange portion 26a, a small diameter cylindrical portion 26b, a second flange portion 26c, and a large diameter cylindrical portion 26d. The first flange portion 26a and the second flange portion 26c are each annular, and the small diameter cylindrical portion 26b and the large diameter cylindrical portion 26d are each cylindrical. The first flange portion 26a is disposed along a horizontal plane. The inner diameter of the first flange portion 26a is smaller than the inner diameter of the pipe main body portion 22 of the piping joint 3.

[0030] The small diameter cylindrical portion 26b protrudes downward from the outer peripheral edge of the first flange portion 26a. The small diameter cylindrical portion 26b is fitted into the lower end of the pipe main body 22 from the radially inner side of the pipe main body 22. The second flange portion 26c projects radially outward from the lower end of the small-diameter cylindrical portion 26b over the entire circumference. The large diameter cylindrical portion 26d protrudes downward from the outer circumferential edge of the second flange portion 26c. The large diameter cylindrical portion 26d is fitted into the upper end of the standpipe connecting portion 24 from the radially inner side of the standpipe connecting portion 24. The first connecting member 26 configured as above is fixed to the joint body 30 with an adhesive or the like. As indicated by the two-dot chain line L1 in FIG. 3, the length of the large diameter cylindrical portion 26d of the first connecting member 26 in the vertical direction may be relatively long.

[0031] As shown in FIG. 2, the second connecting member 27 has a connecting tubular portion 27a and a flange portion 27b. The connecting tubular portion 27a is cylindrical and has an inner thread portion (not shown) formed on the inner circumferential surface thereof. The flange portion 27b is annular and protrudes radially outward from the upper end of the connecting tubular portion 27a over the entire circumference. The flange portion 27b of the second connecting member 27 contacts the first flange portion 26a of the first connecting member 26 from below the first flange portion 26a. The standpipe 7 is connected to the connecting tube portion 27a of the second connecting member 27 via the socket 33. That is, the standpipe 7 is connected to the standpipe connecting portion 24 via the first connecting member 26, the second connecting member 27, and the socket 33. The riser 7 extends downward from the socket 33 .

[0032] As shown in FIGS. 2 and 4, for example, siphon activation member 28 has cover member 28a, a plurality of vertical ribs 28b, flange portion 28c, connecting tube portion 28d, and gripping rib 28e. The cover member 28a is disk-shaped and is disposed along a horizontal plane. The cover member 28a may have a through-hole. A plurality of vertical ribs 28b extend downward from the lower surface of the cover member 28a. Flange portion 28c is provided at the lower ends of multiple vertical ribs 28b. The opening between cover member 28a and flange portion 28c is rainwater inflow opening 28f. A guide (not shown) is formed on the center of the underside of cover member 28a to direct rainwater flowing in from inflow opening 28f downward. The connecting cylindrical portion 28d extends downward from the flange portion 28c. An external thread portion (reference numeral omitted) is formed on the outer peripheral surface of the connecting cylindrical portion 28d. The gripping rib 28e is formed on the upper surface of the cover member 28a.

[0033] A flange portion 28c is formed on the outer periphery of the upper end opening of the connecting cylindrical portion 28d of the siphon activation member 28. The upper end opening of the connecting cylindrical portion 28d is a drainage outlet. The size, height, and shape of each part of siphon activation member 28 are adjusted so that the area of inflow opening 28f is larger than the area of the upper end opening of connecting cylindrical portion 28d (the opening area of the drop spout). In this embodiment, the area of inflow opening 28f can be calculated by multiplying the circumferential length of circular lid member 28a by the height H from flange portion 28c to lid member 28a.

[0034] The inner diameter of connecting tube portion 28d, to which lid member 28a is attached, is preferably 50 mm or more and 170 mm or less. The inner diameter of connecting tube portion 28d is more preferably 70 mm or more and 170 mm or less. In other words, by setting the opening outer diameter of the drop spout of connecting tube portion 28d to the lower limit of 50 mm or more, the large flow rate of rainwater draining through siphon activation member 28 can be smoothly discharged. By setting the upper limit to 170 mm or less, the space required for accommodating the pipe fitting 3 becomes smaller, and it is possible to prevent the pipe fitting 3 from becoming too large.

[0035] In this example, the inner diameter of the connecting tube portions 27a, 28d is set to about half the inner diameter of the straight pipe portion of the pipe main body 22. In addition, the inner diameter of the connecting tube portions 27a, 28d is formed to be about half the inner diameter of the horizontal pipe 6, so the inner diameter of the vertical pipe 7 is formed to be about half the inner diameter of the horizontal pipe 6. In this embodiment, the inner diameter of the standpipe 7 is set to about 1 / 2 the inner diameter of the horizontal pipe 6, but the inner diameter of the standpipe 7 may be set to about 1 / 2 to 1 / 1 the inner diameter of the horizontal pipe 6. That is, the inner diameter of the connecting cylindrical portions 27a, 28d may be set to a range of about 1 / 2 to 1 / 1 of the inner diameter of the pipe main body 22. In any case, in this embodiment, the inner diameters of the connecting cylindrical portions 27a, 28d (which are approximately equal to the inner diameter of the standpipe 7) are set to be equal to or smaller than the inner diameter of the straight pipe portion of the pipe main body 22 (which is approximately equal to the inner diameter of the horizontal pipe 6).

[0036] The first connecting member 26, the second connecting member 27, and the siphon activation member 28 configured as above are each formed from the same material as the joint body 30. For example, the siphon actuation member 28 is an existing member that is separate from the coupling body 30 .

[0037] The second connecting member 27 and the siphon activation member 28 are fixed to the fitting body 30 via the first connecting member 26 by sandwiching the first flange portion 26a of the first connecting member 26 from above and below, and the outer thread portion of the siphon activation member 28 screwing into the inner thread portion of the second connecting member 27. As shown in FIG. 2, the siphon actuation member 28 is provided inside the pipe main body 22.

[0038] As shown in FIG. 1 , the lower end of the second standpipe 36 is connected to the second standpipe connecting portion 25 of the joint body 30 (piping joint 3). The second standpipe 36 has a configuration similar to that of the standpipe 7. The second standpipe 36 extends upward from the second standpipe connecting portion 25. For example, the second standpipe 36 extends to the vicinity of the upper end of the waist wall 2. The second cover member 37 is a cap-shaped member and includes a top plate 37a and a connecting tube 37b provided on one surface of the top plate 37a. An air vent hole is preferably formed in the second cover member 37. The second cover member 37 is detachably attached to the upper end of the second upright pipe 36 via a socket 38. The connecting tube 37b is detachably fitted to the upper end of the socket 38. The top plate 37a is in contact with or close to the upper end of the socket 38 from above this upper end.

[0039] Next, the operation of the drainage piping system S1 configured as above will be described. When rainwater or the like flows along the waterproof sheet 15 and reaches the roof drain 5, it passes through the through holes 11a and flows into the horizontal pipe 6, and then flows into the inside of the pipe main body 22 via the horizontal pipe connection part 23 of the piping fitting 3. The rainwater that flows into the pipe main body 22 changes its flow direction downward and flows through the siphon activation member 28. The siphon activation member 28 causes the rainwater to form a stable flow inside the pipe main body 22. The rainwater travels down the vertical pipe 7 and is discharged to the drainage equipment side, such as a drain pipe.

[0040] Meanwhile, in recent years, there has been a trend toward increasing the diameter of the horizontal pipe 6 to improve drainage capacity, due to measures against sudden heavy rains, etc. In the structure of this embodiment, the inner diameter of the horizontal pipe 6 is equal to or smaller than the inner diameter of the standpipe 7. When rainwater flows into the standpipe 7, gravity acts on the rainwater flowing through the standpipe 7, so the rainwater flowing through the standpipe 7 is discharged more smoothly than the rainwater flowing through the horizontal pipe 6. Therefore, even if a large amount of rainwater flows into the standpipe 7 through the horizontal pipe 6, the rainwater flowing through the standpipe 7 has a faster flow rate, and sufficient drainage can be achieved through the standpipe 7 even with a small inner diameter. As an example, if the nominal diameter of the horizontal pipe 6 is 150 mm, the nominal diameter of the standpipe 7 can be 75 mm. The nominal diameter of the standpipe 7 may be 100 mm, etc.

[0041] In this embodiment, when a standpipe 7 with a smaller diameter than the horizontal pipe 6 is provided, the weight of the standpipe 7 can be reduced compared to a conventional structure in which a standpipe with the same outer diameter as the horizontal pipe 6 is provided. Because the weight of the standpipe 7 can be reduced, the number of metal fittings supporting the standpipe 7 can be reduced, and the strength of the supporting metal fittings can be reduced, thereby reducing excessive load on the building structure. In addition, when installing the standpipe 7, storage space can be reduced and the need for heavy transport equipment can be suppressed, which has the advantage of creating flexibility in the design and construction of the building.

[0042] Next, the operation of the siphon actuation member 28 will be described. When viewed from above, the siphon activation member 28 closes the opening of the downspout (the upper end opening of the connecting tube portion 28d) with drainage water, and seals the standpipe 7 full of water without sucking in air, even when a large amount of rainwater flows in from the inlet opening during heavy rain. As a result, a siphon phenomenon can be generated downstream. In this way, the siphon activation member 28 enables the standpipe 7 to exhibit its high drainage function. Therefore, even if a large amount of rainwater flows into the piping joint 3 from the horizontal pipe 6, good drainage capacity can be obtained.

[0043] The explanation so far has been given of an example in which this embodiment is applied to the roof drain 5 provided on the rooftop floor 1 of the building 1A. However, the roof drain 5 may also be installed on a balcony floor, veranda floor, terrace floor, etc., and therefore the structure of the previous embodiment of the present application can be applied to a roof drain installed on a balcony floor, veranda floor, terrace floor, etc.

[0044] Next, the operation during maintenance of the drainage piping system S1 will be described. As shown in Figure 1, a worker P1 on the rooftop floor 1 of a building 1A removes the second cover member 37 from the socket 38 over the waist wall 2. Then, the inside of the second upright pipe 36 and the piping joint 3 can be cleaned. By using the joint body 30, which is a joint with a known configuration, the cost required for installing the piping joint 3 can be reduced.

[0045] As described above, in the piping fitting 3 of this embodiment, rainwater that flows into the pipe main body 22 through the horizontal pipe connecting portion 23 connected to the horizontal pipe 6 is stabilized by the siphon activation member 28 provided inside the pipe main body 22. Because the stand pipe 7 is connected downstream of the pipe main body 22, the inflow and drainage of rainwater into the stand pipe 7 can be improved.

[0046] The piping joint 3 includes a second standpipe connection portion 25. Therefore, for example, the piping joint 3 (pipe main body portion 22) becomes a tee joint of a known configuration, and the cost required for installing the piping joint 3 can be reduced.

[0047] In addition, in the drainage piping system S1 of this embodiment, a drainage piping system can be constructed that treats rainwater flowing from the roof drain 5 into the horizontal pipe 6 using a piping fitting 3 that improves the inflow and drainage of rainwater into the vertical pipe 7. The piping joint 3 includes a second standpipe connection portion 25, and the drainage piping system S1 includes a second standpipe 36 and a second lid member 37. Therefore, if foreign matter or the like accumulates inside the pipe main body 22 or if clogging or the like occurs due to foreign matter, the second lid member 37, which is disposed at a position relatively far from the pipe main body 22 by the second standpipe 36, can be removed, and the inside of the piping joint 3 can be cleaned through the second standpipe 36. This makes it possible to provide a drainage piping system S1 that is easy to maintain.

[0048] 5, a reducing diameter socket 41 and a siphon activation member 42 may be provided instead of the first connecting member 26, the second connecting member 27, and the siphon activation member 28 of the drainage piping system S1 of the present embodiment. That is, the piping joint 3a of the first modified example is provided with a reducing diameter socket 41 and a siphon activation member 42 instead of the first connecting member 26, the second connecting member 27, and the siphon activation member 28 of the piping joint 3 of the present embodiment.

[0049] As shown in Figures 6 and 7, the reducing socket 41 has a large diameter portion 41a, a small diameter portion 41b, and a connecting portion 41c. The large diameter portion 41a, the small diameter portion 41b, and the connecting portion 41c are each cylindrical and arranged coaxially with one another. The outer diameter of the small diameter portion 41b is smaller than that of the large diameter portion 41a. The small diameter portion 41b is arranged below the large diameter portion 41a. The outer diameter of the connecting portion 41c gradually decreases downward. The connecting portion 41c is arranged between the large diameter portion 41a and the small diameter portion 41b. The upper end of the connecting portion 41c is connected to the lower end of the large diameter portion 41a. The lower end of the connecting portion 41c is connected to the upper end of the small diameter portion 41b.

[0050] 5, the large diameter portion 41a is disposed within the standpipe connecting portion 24 and is connected to the standpipe connecting portion 24. The upper end portion of the standpipe 7 is disposed within the small diameter portion 41b and is connected to the small diameter portion 41b. As shown in FIGS. 6 and 7, the siphon actuation member 42 has a tapered portion 42a instead of the gripping rib 28e of the siphon actuation member 28 of this embodiment. The tapered portion 42a is cylindrical. The outer diameter of the tapered portion 42a gradually increases upward. The outer diameter of the upper end of the tapered portion 42a is larger than the outer diameter of the connecting cylindrical portion 28d. The tapered portion 42a is provided at the lower end of the connecting cylindrical portion 28d.

[0051] Siphon actuation member 42 is connected to reducing socket 41 so that tapered portion 42a contacts connecting portion 41c from above. For example, the siphon actuation member 42 is an existing member that is separate from the coupling body 30 .

[0052] The drainage piping system S1a configured as above can also achieve the same effects as the drainage piping system S1 of this embodiment.

[0053] (Second embodiment) Next, a second embodiment of the present invention will be described with reference to FIGS. 8 to 24. The same components as those in the previous embodiment are designated by the same reference numerals, and their description will be omitted. Only the differences will be described. As shown in FIG. 8, the drainage piping system S2 of this embodiment includes a piping joint 45 instead of the piping joint 3 of the drainage piping system S1 of the first embodiment.

[0054] The piping joint 45 is provided with a first cover member 46 instead of the second standpipe connecting portion 25 of the piping joint 3 . The height dimension of the pipe main body 22 is formed slightly larger than the outer diameter of the horizontal pipe connection part 23. Therefore, the uppermost end position of the horizontal pipe connection part 23 is located below the upper end of the pipe main body 22. The lowermost end position of the horizontal pipe connection part 23 is located near the bottom of the pipe main body 22.

[0055] An enlarged internal cross-sectional structure of the piping joint 45 is shown in FIG. An opening 22a is formed at the top of the straight pipe portion of the pipe main body 22. The piping joint 45 includes a bottom plate 22A provided inside the pipe main body 22. In the configuration shown in Fig. 9, the lowermost end position of the horizontal pipe connecting portion 23 and the bottom plate 22A are at approximately the same height. The bottom plate 22A is used to store members such as the siphon activation member 28. A through hole 22d for communicating with the upright pipe 7 is formed in the center of the bottom plate 22A. In the pipe main body 22, a cylindrical standpipe connecting portion 24 is formed below the bottom plate 22A. The pipe main body 22, the horizontal pipe connecting portion 23, the vertical pipe connecting portion 24, and the bottom plate 22A constitute a joint main body 30A. For example, the joint main body 30A is a new member.

[0056] The outer diameter of the connecting cylindrical portion 28d of the siphon actuation member 28 is formed to be slightly smaller than the inner diameter of the through-hole 22d of the bottom plate 22A. In pipe main body 22, second connecting member 27 is disposed on the underside of bottom plate 22A. Siphon activation member 28 is attached to bottom plate 22A of pipe main body 22 by threading the external thread portion of connecting cylindrical portion 28d of siphon activation member 28 into the internal thread portion of second connecting member 27. In other words, siphon activation member 28 is fixed to bottom plate 22A by sandwiching bottom plate 22A between siphon activation member 28 and second connecting member 27. 9 shows siphon activation member 28 and second connecting member 27 in a state where they are unscrewed and separated from bottom plate 22A. When siphon activation member 28 and second connecting member 27 are attached, siphon activation member 28 and second connecting member 27 are integrated by being screwed together.

[0057] The first cover member 46 has the same structure as the second cover member 37. That is, the first cover member 46 has a top plate 46a and a connecting tube 46b that are structured similarly to the top plate 37a and the connecting tube 37b of the second cover member 37. The first cover member 46 is detachably attached to the opening 22a of the pipe main body 22.

[0058] As described above, with the piping joint 45 of this embodiment, the inflow and drainage of rainwater into the standpipe 7 can be improved. Furthermore, piping joint 45 is provided with first cover member 46. For example, if foreign matter or the like accumulates inside pipe main body 22 or if clogging or the like occurs due to foreign matter, first cover member 46 can be removed to clean the inside of pipe main body 22, etc., and piping joint 45 with excellent maintainability can be provided. Piping joint 45 includes bottom plate 22A. Therefore, various members such as siphon activation member 28 can be installed inside pipe main body 22 using bottom plate 22A.

[0059] 10 shows a drainage piping system S2a according to a first modified example of the second embodiment of the present invention. The configuration of the piping joint 50 provided in the drainage piping system S2a, which has a pipe main body 22, a horizontal pipe connection portion 23, and a standpipe connection portion 24, is the same as that of the piping joint 45 of the second embodiment. The piping joint 50 differs from the piping joint 45 in that the inner diameter of the pipe main body 22 is larger than the inner diameter of the pipe main body 22 of the piping joint 45. The piping joint 50 also differs from the piping joint 45 in that the inner diameter of the standpipe connection portion 24 is larger than the inner diameter of the standpipe connection portion 24 of the piping joint 45. For example, in piping joint 45, the horizontal pipe 6 has a nominal diameter of 150A, and the vertical pipe 7 has a nominal diameter of 75A. In piping joint 50, the horizontal pipe 6 has a nominal diameter of 150A, and the pipe main body 22 and the vertical pipe 7 have nominal diameters of 100A. In piping joint 50, since the nominal diameter of the pipe main body 22 is larger, the upper side of the side wall of the pipe main body 22 is formed to be thicker than the side wall of the pipe main body 22 of piping joint 45. Other configurations of the piping joint 50 are the same as those of the piping joint 45 .

[0060] Unlike the piping joint 50, the size of the standpipe 7 does not have to be half the size of the horizontal pipe 6. The piping joint 50 can also achieve the same effects as the piping joint 45.

[0061] 11 shows a drainage piping system S2b according to a second modified example of the second embodiment of the present invention. The drainage piping system S2b includes a piping joint 55 having a pipe main body 22, a horizontal pipe connection part 23, and a vertical pipe connection part 24, and the configuration is the same as that of the piping joint 45 of the second embodiment. In piping joint 45, the horizontal pipe 6 has a nominal diameter of 150A, and the vertical pipe 7 has a nominal diameter of 75A. In piping joint 55, the horizontal pipe 6 has a nominal diameter of 100A, and the pipe main body 22 and the vertical pipe 7 have a nominal diameter of 75A. The other configurations of the piping joint 55 are the same as those of the piping joint 45 . The piping joint 55 can also provide the same effects as the piping joint 45 .

[0062] 12 shows a drainage piping system S2c according to a third modified example of the second embodiment of the present invention. The drainage piping system S2c includes a piping joint 60 having a pipe main body 22, a horizontal pipe connection part 23, and a vertical pipe connection part 24, and the configuration is the same as that of the piping joint 45 according to the second embodiment. In the piping joint 45, the horizontal pipe 6 has a nominal diameter of 150A, and the vertical pipe 7 has a nominal diameter of 75A. In the piping joint 60, the horizontal pipe 6 has a nominal diameter of 100A, and the pipe main body 22 and the vertical pipe 7 have a nominal diameter of 100A. Other configurations of the piping joint 60 are the same as those of the piping joint 45. As in the drainage piping system S2b of the second modified example of the second embodiment, the horizontal pipe 6 and the vertical pipe 7 may have the same nominal diameter size. The piping joint 60 can also provide the same effects as the piping joint 45 .

[0063] 13 and 14 show a drainage piping system S2d according to a fourth modified example of the second embodiment of the present invention. The drainage piping system S2d includes a piping joint 65 having a pipe main body 66, a horizontal pipe connection part 23, and a vertical pipe connection part 24, and the configuration is the same as that of the piping joint 45 of the second embodiment. Piping joint 65 is characterized in that the planar shape of pipe main body 66 is rectangular. There are no particular restrictions on the planar shape of pipe main body 66, and it may be an elliptical (or circular) pipe main body 67 as shown in Fig. 15, or a pipe main body 68 in which half of the planar shape is circular and the other half is rectangular as shown in Fig. 16. The square pipe body 66 shown in Figs. 13 and 14 can be installed closer to the adjacent wall surface, so that a stable support structure can be achieved when installed on a wall surface.

[0064] 17 shows a drainage piping system S2e according to a fifth modified example of the second embodiment of the present invention. The drainage piping system S2e includes a piping joint 70 having a pipe main body 22, a horizontal pipe connection part 71, and a vertical pipe connection part 24, and has a configuration similar to that of the piping joint 45 of the second embodiment. In the piping joint 70, the horizontal pipe connecting portion 71 does not have a branch pipe portion. The difference is that the horizontal pipe connecting portion 71 has a connecting hole 72 formed in the side surface of the pipe main body 22 and a thick-walled portion 73 formed around the outer periphery thereof. Like the horizontal pipe connecting portion 71, the horizontal pipe connecting portion 71 may be configured from a connecting hole 72 and a thick portion 73. The piping joint 70 can also provide the same effects as the piping joint 45 .

[0065] 18 shows a drainage piping system S2f according to a sixth modified example of the second embodiment of the present invention. The drainage piping system S2f includes a piping joint 75 having a pipe main body 22, a horizontal pipe connection part 76, and a vertical pipe connection part 24, and the configuration is the same as that of the piping joint 45 of the second embodiment. The piping fitting 75 differs in that the horizontal pipe connection portion 76 does not have a branch pipe portion, but consists of a connection hole 77 formed on the side surface of the central portion in the height direction of the pipe main body portion 22, and a thick-walled portion 78 formed on the outer periphery thereof. Like the horizontal pipe connecting portion 56, the horizontal pipe connecting portion 76 may be configured from a connecting hole 77 and a thick portion 78, and may be formed at the center of the pipe main body portion 22 in the height direction. In the structure shown in FIG. 18, the drainage water from the horizontal pipe 6 flows into the pipe main body 22 from a position higher than the bottom plate 22A or the siphon actuation member . The piping joint 75 can also provide the same effects as those of the piping joint 70.

[0066] 19 and 20 show a drainage piping system S2g according to a seventh modified example of the second embodiment of the present invention. The piping joint 80 included in the drainage piping system S2g has a pipe main body 22, a horizontal pipe connecting part 23, and a standpipe connecting part 24, and is configured similarly to the piping joint 45 of the second embodiment. The configuration in which a horizontal pipe 6 is connected to the horizontal pipe connecting part 23 and a standpipe 7 is connected to the standpipe connecting part 24 is also similar. The piping joint 80 is characterized in that the standpipe 7 is connected to the standpipe connection part 24 via an S-shaped elbow pipe 81. By arranging the standpipe 7 via the elbow pipe 81, the standpipe 7 can be arranged at a position closer to the wall surface of the waist wall 2 compared to the drainage piping system S2 shown in Figure 8. By positioning the standpipe 7 close to the wall surface, the standpipe 7 can be positioned close to the wall surface of the waist wall 2 and the outer wall of the lower floor. This allows the length of the metal fittings that secure the standpipe 7 to the waist wall 2 and the outer wall to be shortened, thereby stabilizing the mounting structure of the standpipe 7 using the metal fittings.

[0067] 21 shows a drainage piping system S2h according to an eighth modified example of the second embodiment of the present invention. The drainage piping system S2h includes a piping joint 85 having a pipe main body 22, a horizontal pipe connection part 23, and a vertical pipe connection part 24, and the configuration is the same as that of the piping joint 45 of the second embodiment. The piping joint 85 is characterized in that no through-hole 22d is formed in the bottom plate 22A of the pipe main body 22. As an example, the piping joint 85 is a piping joint at the factory shipping stage before being attached to the upper end of the standpipe 7. After manufacturing the piping joint 85 in the factory, it is transported to the installation site, where a worker can form the through hole 22d of the required inner diameter in the bottom plate 22A on site to match the size of the standpipe at the site. By forming the through hole 22d of the required inner diameter in the bottom plate 22A, the standpipe connection part 24 is completed. The piping joint 85 can also provide the same effects as the piping joint 45 .

[0068] 22 shows a drainage piping system S2i according to a ninth modified example of the second embodiment of the present invention. The drainage piping system S2i includes a piping joint 90 having a pipe main body 22, a horizontal pipe connection part 23, and a vertical pipe connection part 24, and has a configuration equivalent to that of the piping joint 45 of the second embodiment. The piping joint 90 is characterized in that no through-hole 22d is formed in the bottom plate 22A of the pipe main body 22. The piping joint 90 is a piping joint at the factory shipping stage, for example, before being attached to the upper end of the standpipe 7. After manufacturing the piping joint 90 in the factory, it is transported to the installation site, where a worker can form the through hole 22d of the required inner diameter in the bottom plate 22A on site to match the size of the standpipe at the site. By forming the through hole 22d of the required inner diameter in the bottom plate 22A, the standpipe connection part 24 is completed. The piping joint 90 can also provide the same effects as the piping joint 50 (piping joint 45).

[0069] 23 shows a drainage piping system S2j according to a tenth modified example of the second embodiment of the present invention. The drainage piping system S2j includes a piping joint 95 having a pipe main body 22, a horizontal pipe connection part 23, and a vertical pipe connection part 24, and the configuration is the same as that of the piping joint 50 according to the first modified example of the second embodiment. The piping joint 95 is characterized in that a through-hole 22e for a nominal diameter of 75A is formed in the bottom plate 22A of the pipe main body 22. Because the pipe main body 22 is sized for a nominal diameter of 100A, the bottom plate 22A is large enough to form a through-hole of the nominal diameter of 100A, but the through-hole 22e for a nominal diameter of 75A is formed in the bottom plate 22A. As in the drainage piping system S2j of the tenth modification, a through-hole 22e corresponding to a nominal diameter of 75 A may be formed in a bottom plate 22A capable of forming a through-hole corresponding to a nominal diameter of 100 A. In this piping joint 95, a piping joint corresponding to a nominal diameter of 100 A is applied to a nominal diameter of 75 A, and a piping joint of a specific size can be used in common for two different sizes of standpipes. The piping joint 95 can also provide the same effects as the piping joint 50 .

[0070] 24 shows a drainage piping system S2k according to an eleventh modified example of the second embodiment of the present invention. The drainage piping system S2k includes a piping joint 100 that is provided with a second standpipe connecting portion 25 in comparison with the piping joint 45 of the second embodiment. A second standpipe 36, a second cover member 37, and the like are connected to the second standpipe connecting portion 25 of the piping joint 100.

[0071] Incidentally, the piping joints described so far are configured to have a detachable first cover member 46 or the like to allow the interior of the pipe main body 22 or the like to be opened. This is to enable the first cover member 46 to be removed to clean the interior of the pipe main body 22. This is also to facilitate the installation of the siphon activation member 28. However, the first cover member 46 or the like is not an essential component and may be omitted. If the size of the horizontal pipe connection portion 23 is sufficiently large, or if the inside of the pipe main body portion 22 can be cleaned from the inside of the waist wall 2, the first cover member 46 etc. may be omitted and the upper part of the pipe main body portion 22 may be closed.

[0072] (Third embodiment) Next, a third embodiment of the present invention will be described with reference to FIGS. 25 to 35. The same components as those in the previous embodiment will be given the same reference numerals, and a description thereof will be omitted. Only the differences will be described. 25, the drainage piping system S3 of this embodiment includes a piping joint 105 instead of the piping joint 45 of the drainage piping system S2 of the second embodiment. The piping joint 105 of the third embodiment does not include a siphon activation member. In the piping joint 105, the inner diameter of the horizontal pipe connecting portion 23 is set to an inner diameter that allows the horizontal pipe 6 to be inserted as described above, but the inner diameter of the straight pipe portion of the pipe main body 22 is formed to be approximately equal to the inner diameter of the horizontal pipe connecting portion 23. The horizontal pipe connecting portion 23 is formed at a position slightly below the upper end of the pipe main body 22. 25 to 27, the height dimension of the pipe main body 22 is formed slightly larger than the outer diameter of the horizontal pipe connecting portion 23. The uppermost end position of the horizontal pipe connecting portion 23 is located slightly below the upper end of the pipe main body 22. The lowermost end position of the horizontal pipe connecting portion 23 is located near the bottom of the pipe main body 22.

[0073] In the third embodiment, the inner diameter of the standpipe connecting portion 24 is about half the inner diameter of the pipe main body portion 22. Furthermore, since the inner diameter of the standpipe connecting portion 24 is about half the inner diameter of the horizontal pipe 6, the inner diameter of the standpipe 7 is about half the inner diameter of the horizontal pipe 6. In this embodiment, the inner diameter of the standpipe connecting portion 24 is smaller than the inner diameter of the horizontal pipe connecting portion 23. In this embodiment, the inner diameter of the standpipe 7 is about 1 / 2 of the inner diameter of the horizontal pipe 6, but the inner diameter of the standpipe 7 may be formed to be about 1 / 2 to 2 / 3 of the inner diameter of the horizontal pipe 6. That is, the inner diameter of the standpipe connecting portion 24 may be in the range of about 1 / 2 to 2 / 3 of the inner diameter of the pipe main body portion 22. In any case, in this embodiment, the inner diameter of the standpipe connecting portion 24 (substantially equal to the inner diameter of the standpipe 7) is smaller than the inner diameter of the pipe main body portion 22 (substantially equal to the inner diameter of the horizontal pipe 6).

[0074] The overall outline of the piping joint 105 is shown in FIG. 26, and the internal cross-sectional structure of the piping joint 105 is shown in FIG. As shown in Figures 26 and 27, the piping joint 105 has a reduced diameter portion 106, a current plate 107, a first lid member 108, and a water flow guide slope 109 instead of the siphon activation member 28 of the piping joint 45. The reduced diameter portion 106 is cylindrical, and its inner and outer diameters gradually decrease downward. The reduced diameter portion 106 is disposed between the pipe main body 22 and the standpipe connection portion 24. The piping joint 105 is provided with a plurality of rectifying plates 107. The plurality of rectifying plates 107 protrude from the lower end of the pipe main body 22 to the lower end of the reduced diameter portion 106 around the pipe main body 22 and the reduced diameter portion 106 at predetermined intervals. The reduced diameter portion 106 is integral with the pipe main body portion 22 and the standpipe connecting portion 24 .

[0075] The rectifying plate 107 is disposed so as to extend in the length direction (vertical direction) of the pipe main body 22 from the lower end of the pipe main body 22 to the lower end of the reduced diameter portion 106. The rectifying plate 107 may also be formed on the lower side of the pipe main body 22 as long as it does not interfere with the lower end 108c of the extending portion 108a. In this embodiment, six rectifying plates 107 are provided as shown in Figures 27 to 29. These rectifying plates 107 are formed so that the protrusion amount (width) is greater on the upper side and gradually decreases toward the lower side. In this embodiment, six rectifying plates 107 are provided, but the number may be one or more. It is preferable to provide multiple rectifying plates 107 radially around the tube axis of the reduced diameter portion 106.

[0076] 27 and 28, the first cover member 108 is a cylindrical member that is fitted into the opening 22a. The first cover member 108 is detachably attached to the opening 22a of the tube main body 22. An extension 108a is formed on the bottom side of the first lid member 108, which closes the opening 22a and extends from the upper end side of the tube main body 22 to the bottom side of the tube main body 22. The water flow guide slope 109 is formed on this extension 108a, i.e., on the lower part of the first cover member 108. When the opening 22a is closed by the first cover member 108, the water flow guide slope 109 is inclined with respect to both the central axis 23a of the horizontal pipe connecting portion 23 and the central axis 24a of the vertical pipe connecting portion 24. The water flow guide slope 109 has an arc shape that is concave obliquely upward, as shown in Figure 27.

[0077] Because the extending portion 108a is formed with the water flow guide slope 109, the vertical thickness of the first cover member 108 is thin on the horizontal pipe connecting portion 23 side and gradually becomes thicker toward the opposite side. Therefore, the lower end 108c of the extending portion 108a extends to the lower side of the pipe main body 22. To explain in more detail, the lower end 108c of the extending portion 108a extends to a height position corresponding to the lowest end position of the horizontal pipe connecting portion 23. The water flow guide slope 109 of the first cover member 108 is provided to smoothly change the flow direction of the rainwater downward when the amount of rainwater flowing in from the horizontal pipe connection portion 23 side increases, and to adjust the flow of the rainwater so as to prevent turbulence from occurring inside the piping joint 105. In addition, the first cover member 108 is fitted to the pipe main body 22 so that it can be removed when it becomes necessary to clean the inside of the piping joint 105, for example. An outward flange portion 108d is formed on the upper end portion of this first lid member 108. When the opening 22a of the pipe main body 22 is closed with the first lid member 108, the flange portion 108d covers the upper peripheral surface of the opening 22a of the pipe main body 22.

[0078] When rainwater or the like flows along the waterproof sheet 15 and reaches the roof drain 5, the rainwater passes through the through holes 11a and flows into the horizontal pipe 6, and then flows into the inside of the pipe body 22 via the horizontal pipe connection part 23 of the piping joint 105. The rainwater that flows into the pipe body 22 hits the water flow guide slope 109, changes its flow direction downward, passes through the reduced diameter part 106, and travels down the vertical pipe 7 to be discharged to the drainage equipment side, such as a catch basin.

[0079] When the amount of rainwater flowing into the inside of the pipe main body 22 increases, the rainwater hits the water flow guide slope 109. The flow direction of the rainwater is changed smoothly from horizontal to downward. Therefore, even if a large amount of rainwater flows into the piping joint 105, there is little risk of turbulence or reverse flow due to turbulence occurring inside the pipe main body 22, and good drainage capacity can be obtained. Furthermore, since a plurality of flow straightening plates 107 are provided from the bottom of the pipe main body 22 to the reduced diameter portion 106, the flow of rainwater flowing from the bottom side of the pipe main body 22 to the reduced diameter portion 106 can be straightened. This allows rainwater to be smoothly discharged from the piping joint 105 to the standpipe 7.

[0080] As described above, with the piping joint 105 of this embodiment, the inflow and drainage of rainwater into the standpipe 7 can be improved. Furthermore, the inner diameter of the standpipe connecting portion 24 is smaller than the inner diameter of the horizontal pipe connecting portion 23. For example, even if the diameter of the horizontal pipe 6 is increased to deal with sudden heavy rain, the inner diameter of the standpipe connecting portion 24 is smaller than the inner diameter of the horizontal pipe connecting portion 23, so that a standpipe 7 with a smaller inner diameter can be connected. Even if the diameter of the horizontal pipe 6 becomes large and the amount of rainwater flowing from the horizontal pipe 6 into the vertical pipe 7 increases, gravity acts on the rainwater flowing in the vertical pipe 7, causing the rainwater to be discharged faster than the rainwater flowing in the horizontal pipe 6, so there is no problem with the drainage capacity. Even if the diameter of the horizontal pipe 6 is increased to counteract sudden heavy rain, the diameter of the standpipe 7 can be reduced, which eliminates the need to increase the strength of the metal fittings that support the standpipe 7. Furthermore, the number of support fittings required can be reduced. Furthermore, the ability to reduce the diameter of the standpipe 7 reduces the load on the building frame. In addition, since there is no need to use a large-diameter standpipe 7, the storage space for the large-diameter standpipe 7 can be reduced, which contributes to the miniaturization of heavy transport equipment and provides a structure that does not impose a load on the design and construction of building 1A.

[0081] The piping joint 105 is provided with a water flow guide slope 109. The flow of rainwater that flows into the inside of the pipe main body 22 from the horizontal pipe 6 hits the water flow guide slope 109 and changes direction, allowing the rainwater to smoothly change direction and be introduced into the upright pipe 7. This makes it possible to smooth the flow of rainwater inside the pipe main body 22. The piping joint 105 includes a reduced diameter portion 106. Therefore, rainwater flowing from the pipe main body 22 toward the standpipe 7 can be smoothly guided by the reduced diameter portion 106.

[0082] 30 is an explanatory diagram schematically illustrating the positional relationship between the central axis 22b of the pipe main body 22 and the central axis 24a of the standpipe connecting portion 24 in a piping joint 105 according to the third embodiment. In the piping joint 105, the central axis 22b and the central axis 24a overlap at the same position. FIG. 31 is an explanatory diagram that schematically illustrates the positional relationship between the central axis 22b of the pipe main body 22 and the central axis 24a of the standpipe connecting portion 24 in a piping joint 115 of a first modified example of the third embodiment. Piping joint 115 has the same structure as piping joint 105 in that the vertical pipe connection portion 24 is provided below the reduced diameter portion 106, but differs in that the vertical pipe connection portion 24 is formed in an eccentric position to the right as shown in Figure 31. In piping joint 115, central axis 22b and central axis 24a are spaced apart from each other on the left and right in Fig. 31. That is, standpipe connecting portion 24 is disposed at a position farther away from outer wall 8 than standpipe connecting portion 24 of piping joint 105. Therefore, in piping joint 115, standpipe 7 can be disposed at a position slightly farther away from outer wall 8 than in piping joint 105.

[0083] 32 is an explanatory diagram that schematically illustrates the positional relationship between the central axis 22b of the pipe main body 22 and the central axis 24a of the standpipe connecting portion 24 in a piping joint 120 of a second modified example of the third embodiment. The piping joint 120 is similar to the piping joint 105 in that the standpipe connecting portion 24 is provided below the reduced diameter portion 106, but differs in that the standpipe connecting portion 24 is formed at a position eccentric to the left as shown in FIG. In the piping joint 120, the central axis 22b and the central axis 24a are spaced apart from each other on the left and right sides in Figure 32. That is, the standpipe connecting portion 24 is formed at a position closer to the outer wall 8 than the piping joint 105. Therefore, in the piping joint 120, the standpipe 7 can be disposed at a position closer to the outer wall 8 than the piping joint 105. As described above, in the piping joints 115 and 120, the standpipe connecting portion 24 is disposed eccentrically with respect to the pipe main body portion 22.

[0084] The ability to place the standpipe 7 close to the outer wall 8 means that the standpipe 7 can be supported even if the strength of the metal fittings supporting the standpipe 7 is reduced, which makes the installation work of the standpipe 7 easier and reduces the equipment costs. If the standpipe connection portion 24 is disposed eccentrically relative to the pipe main body portion 22, for example, the standpipe 7 can be installed closer to or farther away from the outer wall 8, which is located near the piping joints 115, 120. If the standpipe 7 can be disposed closer to the outer wall 8, the wind pressure acting on the standpipe 7 can be reduced, and the burden on the support structure of the standpipe 7 due to wind pressure will be reduced.

[0085] In the above embodiment, multiple straightening plates 107 are provided protruding from the circumference of reduced diameter portion 106 at predetermined intervals, but the installation position of straightening plates 107 is not limited to this. For example, one or multiple straightening plates may be provided on first cover member 108. Straightening plates may be formed by forming water flow guiding slope 109 of first cover member 108 into multiple plate shapes. Straightening plates may also be provided so as to protrude from water flow guiding slope 109 of first cover member 108. In this case, the rectifying vane is preferably arranged parallel to a plane passing through the pipe axes of the horizontal pipe connecting portion 23 and the vertical pipe connecting portion 24. Furthermore, as long as it does not interfere with the reduced diameter portion 106, it may also be formed on the inner surface of the lower part of the pipe main body portion 22 below the lower end 108c of the extending portion 108a. Furthermore, a rectifying vane may be provided on both the first cover member 108 and the reduced diameter portion 106.

[0086] In the above embodiment, the opening 22a is formed at the upper end of the pipe main body 22 in the piping joint 105, and the first cover member 108 is provided so as to be detachably fitted into this opening 22a. However, an opening may be provided on the side surface of the pipe main body 22, and the first cover member may be provided so as to be detachably fitted into the opening on the side surface.

[0087] Furthermore, the reduced diameter portion 106 provided below the pipe main body 22 may be molded integrally with the pipe main body 22, or may be formed as a separate member. When the pipe main body 22 and the reduced diameter portion 106 are separate members, there are fewer restrictions on mold design for injection molding, and the degree of freedom in the shape of the rectifying plate provided integrally with the reduced diameter portion 106 can be increased. Furthermore, if the rectifying plate is molded as a separate member, it is not necessary to provide the first cover member on the pipe main body 22. The rectifying plate can be disposed inside the pipe main body 22 or the reduced diameter portion 106 before the pipe main body 22 and the reduced diameter portion 106 are fitted together.

[0088] 33 and 34 show a piping joint 125 according to a third modified example of the third embodiment of the present invention, in which a plurality of current plates 108e are provided on the first cover member 108. The piping joint 125 of this form is provided with a plurality of current plates 108e that protrude from the water flow guiding slope 109 of the first cover member 108 toward the horizontal pipe connecting portion 23 and the vertical pipe connecting portion 24. The plurality of current plates 108e protrude toward the inside of the pipe main body 22. The plurality of current plates 108e may be provided so as to protrude from the inner surface of the pipe main body 22. The number of current plates 108e provided on the first cover member 108 may be one. When viewed in cross section from the side in the direction shown in Fig. 33, the rectifying vane 108e is formed in a fan shape with a central angle of approximately 90°. Furthermore, when viewed in cross section as in Fig. 33, the multiple rectifying vanes 108e (five in the drawing) are arranged parallel to the display surface of Fig. 33 at predetermined intervals. When viewed from the front as in Fig. 34, the multiple rectifying vanes 108e are arranged at predetermined intervals in the left-right direction. The multiple rectifying vanes 108e are arranged parallel to the central axis of the horizontal pipe connecting portion 23 and the central axis of the vertical pipe connecting portion 24, respectively.

[0089] The piping joint 125 is provided with the flow straightening plate 108e, thereby making it possible to smooth the flow of rainwater flowing from the horizontal pipe connecting portion 23 to the vertical pipe connecting portion 24. When a plurality of rectifying plates 108e protrude toward the inside of the pipe main body 22, the flow of rainwater flowing from the pipe main body 22 into the standpipe connecting portion 24 can be made smooth by the rectifying plates 108e.

[0090] 35 shows a piping joint 130 according to a fourth modification of the third embodiment, which is provided with a siphon activation member 131 inside. The piping joint 130 has the siphon activation member 131 provided on the inner bottom of the pipe main body 22. The siphon actuation member 131 has an attachment portion 132, a plurality of (for example, four) flow straightening pieces 133, and a water drain plate . The mounting portion 132 is a short cylinder. The multiple flow straightening pieces 133 extend diagonally upward inward from four locations on the inner periphery of the mounting portion 132. The water drain plate 134 is a disk. The water drain plate 134 is integrally connected to the upper ends of the multiple flow straightening pieces 133.

[0091] Four rectifying pieces 133 extend at 90° intervals around the inner periphery of the mounting portion 132. Each rectifying piece 133 extends obliquely upward from the inner periphery of the mounting portion 132 toward the central axis of the mounting portion 132. An inclined portion 136 that connects to the peripheral surface of the water drain plate 134 is formed at the portion where the upper end of each flow straightening piece 133 joins to the water drain plate 134. The inclined portion 136 is joined to the peripheral surface of the water drain plate 134 while being inclined relative to the surface.

[0092] The mounting portion 132 is fixed to the inner circumferential surface of the pipe main body 22 by a mounting means such as adhesive. Four flow straightening pieces 133 extending upward from the mounting portion 132 are arranged so as to face the joint portion with the horizontal pipe 6 on the circumferential surface of the pipe main body 22. The water drain plate 134 is disposed in a direction perpendicular to (horizontally with) the central axis of the pipe main body 22. The water drain plate 134 is installed at a position about half the height of the part where the horizontal pipe 6 is connected to the pipe main body 22.

[0093] The opening between the drain plate 134 and the mounting portion 132 serves as an inflow opening F1 for wastewater. The size, height, and shape of each part of siphon activation member 131 are adjusted so that the area of inflow opening F1 is larger than the opening area on the upper surface of mounting portion 132 (opening area of the drop port portion).

[0094] The diameter of the water drain plate 134 is approximately half the inner diameter of the pipe main body 22. Because the water drain plate 134 is installed above the mounting part 132, the wastewater that flows into the pipe main body 22 passes around the water drain plate 134, reaches the reduced diameter part 106, and is discharged to the upright pipe 7 side. Furthermore, when the amount of drainage increases and the drainage reaches a position inside the pipe main body 22 that is higher than the water drain plate 134, a siphon phenomenon occurs as the drainage passes through the siphon activation member 131. In other words, the inside of the standpipe 7 can be filled with drainage and drained efficiently without entraining air bubbles or the like on the side of the standpipe 7 below the siphon activation member 131. This allows a large amount of wastewater to flow into the standpipe 7. Therefore, even if a large amount of wastewater flows from the horizontal pipe 6 with a large inner diameter into the standpipe 7 with a small inner diameter, good drainage performance can be ensured using the standpipe 7. The length of the horizontal pipe 6 does not need to be longer than necessary. For example, if the length of the horizontal pipe 6 is 2 m or less, there is no effect on the occurrence of the siphon phenomenon and no problem occurs. Furthermore, it is more preferable that the length of the horizontal pipe 6 is 1.0 m or less.

[0095] (Fourth embodiment) Next, a fourth embodiment of the present invention will be described with reference to FIGS. 36 to 41. The same parts as those in the previous embodiment are given the same reference numerals and their description will be omitted, and only the differences will be described. 36, in the drainage piping system S4 of the present embodiment, the first connecting member 26 and the second connecting member 27 in the drainage piping system S1 of the first embodiment are integrated. The drainage piping system S4 is provided with a piping joint 140 instead of the piping joint 3 of the drainage piping system S1. The piping joint 140 is provided with a reducing socket 141 and a siphon activation member 146 instead of the first connecting member 26, the second connecting member 27, and the siphon activation member 28 of the piping joint 3.

[0096] 37 and 38, the reducing socket 141 has a large diameter portion 142, a small diameter portion 143, and a connecting portion 144. The large diameter portion 142, the small diameter portion 143, and the connecting portion 144 are each formed in a cylindrical shape and are arranged coaxially with one another. The outer diameter of the small diameter portion 143 is smaller than the outer diameter of the large diameter portion 142. The small diameter portion 143 is arranged below the large diameter portion 142. The outer diameter of connecting portion 144 gradually decreases downward. Connecting portion 144 is disposed between large diameter portion 142 and small diameter portion 143. The upper end of connecting portion 144 is continuous with the lower end of large diameter portion 142. The lower end of connecting portion 144 is continuous with the upper end of small diameter portion 143. 36, the large diameter portion 142 is disposed within the standpipe connecting portion 24 and is connected to the standpipe connecting portion 24. The upper end portion of the standpipe 7 is disposed within the small diameter portion 143 and is connected to the small diameter portion 143. The reducing socket 141 configured as described above functions as a reduced diameter portion. The reducing socket 141 is a separate body from the pipe main body 22.

[0097] As shown in FIGS. 37 and 38, siphon activation member 146 has a cover member 147, a flange portion 148, and a connecting tube portion 149. For example, the cover member 147 is cylindrical with a top. An inlet opening F2 for drainage is formed on the side surface of the cover member 147. The flange portion 148 and the connecting tube portion 149 are each formed in a cylindrical shape. The flange portion 148 covers the lower end portion of the lid member 147 from the radially outer side of the lid member 147. The lid member 147 is connected to the flange portion 148. The connecting tubular portion 149 is disposed below the flange portion 148. The connecting tubular portion 149 is connected to the flange portion 148 via a connecting portion (not shown).

[0098] Siphon activation member 146 configured as described above is assembled to reducing socket 141 from above. Specifically, connecting tube portion 149 is disposed within small diameter portion 143, and flange portion 148 is disposed on connecting portion 144. Then, as shown in Figure 36, when reducing socket 141 is connected to standpipe connecting portion 24 of piping joint 140, a radial gap is formed between pipe main body 22 and cover member 147. When a large amount of rainwater flows in from the inlet opening F2 during heavy rain, the siphon activation member 146 seals the standpipe 7 while keeping it full of water without sucking in air. As a result, a siphon phenomenon occurs downstream of the siphon activation member 146, and the inside of the standpipe 7 can be filled with wastewater while efficiently draining it.

[0099] As described above, with the piping joint 140 of this embodiment, the inflow and drainage of rainwater into the standpipe 7 can be improved.

[0100] Fig. 39 shows a drainage piping system S4a according to a first modified example of the fourth embodiment of the present invention. As shown in Fig. 39 and Fig. 40, a piping joint 155 included in the drainage piping system S4a includes a bottom plate 156, a standpipe joint 157, and a siphon activation member 158 instead of the standpipe connection portion 24 and siphon activation member 146 of the piping joint 140 of the fourth embodiment. 40 and 41, the bottom plate 156 is annular in shape and is formed on the inside in the radial direction at the lower end of the pipe main body 22. The riser pipe connecting portion 157 is cylindrical. The riser pipe connecting portion 157 extends downward from the inner peripheral edge of the bottom plate 156. That is, the outer diameter of the riser pipe connecting portion 157 is smaller than the outer diameter of the pipe main body portion 22.

[0101] The siphon activation member 158 has a water drain plate 161 and a pair of support legs 162. The water drain plate 161 is disk-shaped and arranged along a horizontal plane. The water drain plate 161 is arranged within the pipe main body 22 so as to be spaced apart from the pipe main body 22. The water drain plate 161 is arranged at the same position in the vertical direction as the vertical middle part of the horizontal pipe connection part 23. Each support leg 162 is flat. Each support leg 162 is arranged along the central axis of the horizontal pipe connection portion 23 and in the vertical direction. The pair of support legs 162 are arranged spaced apart from each other in directions perpendicular to the central axis of the horizontal pipe connection portion 23 and the vertical direction. The upper ends of the pair of support legs 162 are each joined to the water drain plate 161. The lower ends of the pair of support legs 162 are each joined to the vertical pipe connection portion 157. In other words, the siphon activation member 158 is integral with the pipe main body 22. The piping joint 155 configured as above is integrally formed by, for example, injection molding.

[0102] As shown in FIG. 39, the riser pipe connecting portion 157 of the piping joint 155 is connected to the upper end of the riser pipe 7 via a socket 163 .

[0103] In the piping joint 155 configured as described above, the siphon actuation member 158 generates a siphon phenomenon, allowing the interior of the standpipe 7 to be filled with wastewater and drained efficiently. Furthermore, when rainwater flows from the horizontal pipe 6 into the pipe main body 22, the water drain plate 161 and the pair of support legs 162 can be prevented from interfering with the rainwater flowing from the horizontal pipe 6.

[0104] Although the first to fourth embodiments of the present invention have been described above in detail with reference to the drawings, the specific configurations are not limited to these embodiments, and the present invention also includes modifications, combinations, deletions, etc. of the configurations within the scope of the gist of the present invention. Furthermore, it goes without saying that the configurations shown in each embodiment can be used in appropriate combinations. For example, in the first to fourth embodiments, the pipe main body may be an elbow pipe using an arc-shaped bent pipe with a central angle of 90°. In this case, the piping joint includes a horizontal pipe connecting portion and a vertical pipe connecting portion. Although the rectifying member is described as a siphon actuation member, the rectifying member is not particularly limited as long as it has the function of regulating the flow of wastewater.

[0105] "Drainage capacity verification test" The following three types of verification tests were carried out to verify the effectiveness of the piping joint 45 shown in FIG. 8 when actually draining water. In the verification test, a three-story building 1B shown in Figure 42 was used, and an eaves gutter simulator 175 measuring 30 cm wide, 35 cm deep, and 8 m long was installed on the third floor 173. A V-shaped horizontal pipe (horizontal pull pipe: nominal diameter 150A) 176 shown in Figure 43 was connected to one end wall 175a of the eaves gutter simulator 175, and the horizontal pipe connection part 23 of the piping joint 45 was connected to the tip of this horizontal pipe 176. A vertical pipe (nominal diameter 75A) 178 approximately 6 m high, extending from the third floor 173 of the building 1B to the first floor 171, was connected to the standpipe connection part 24 of the piping joint 45. A vertical pipe 178 was connected to a rainwater manhole 179 installed on the first floor 171 via a connecting pipe 180. This rainwater manhole 179 was connected to a drainage pit 182 via a horizontal pipe 181 installed on the first floor 171. In the eaves gutter simulator 175, the roof drain 5 was arranged inside the end wall 175a to which the horizontal pipe 176 was connected.

[0106] The first verification test was conducted using the verification test device described above to verify the drainage performance when a predetermined amount of water was flowed into the eaves gutter simulator 175. The verification test was conducted by flowing a predetermined amount of tap water (5 L / s, 10 L / s, 15 L / s, 20 L / s) into the eaves gutter, passing the tap water from a 30 cm long horizontal pipe 176 through a piping joint 45 and discharging it into a standpipe 178, and measuring the water level (referred to as the "underwater water level") at a position 50 cm away from the end wall 175a of the eaves gutter simulator 175. The results of the first verification test are shown in Figure 45.

[0107] In the second verification test, in the verification test device described above, the horizontal pipe 176 provided on the end wall 175a of the eaves gutter simulator 175 was removed, and instead, an L-shaped horizontal pipe (horizontal pull pipe: nominal diameter 150A) 185 was connected to the side wall 175b 45 cm away from the end wall 175a of the eaves gutter simulator 175, as shown in Figure 44. The horizontal pipe connecting part 23 of the piping joint 45 was connected to the tip of this horizontal pipe 185. The length of the horizontal pipe 185 along the longitudinal direction of the eaves gutter simulator 175 was 1 m. In addition, in the eaves gutter simulator 175, the roof drain 5 was arranged inside the side wall 175b to which the horizontal pipe 185 was connected. The second verification test was carried out by running a predetermined amount of tap water (5 L / s, 10 L / s, 15 L / s, 20 L / s) into the eaves gutter, passing it through a 1 m long horizontal pipe 185 and piping joint 45, and draining it into the upright pipe 178, and measuring the water level (referred to as the water level below) at a position 50 cm away from the end wall 175a of the eaves gutter simulator 175. The results of the second verification test are shown in Figure 45.

[0108] In the third verification test, a verification test equivalent to the first verification test was conducted using the verification device used in the first verification test, except that a 90° Y-shaped pipe was used as a joint instead of piping joint 45, and a vertical pipe with a nominal diameter of 150A was connected to a horizontal pipe with a nominal diameter of 150A. The results of the third verification test are shown in Figure 45.

[0109] In the graph shown in Figure 45, the horizontal axis shows the amount of water (flow rate) (5L / s, 10L / s, 15L / s, 20L / s) flowing into the eaves gutter simulator 175, and the vertical axis shows the water level (0 to 300mm) below the water level. As shown in the graph in Figure 45, in all verification tests, the underwater water level gradually rose as the amount of water flowing into the eaves gutter simulator 175 increased. In the graph shown in Figure 45, when comparing the same amount of water, a lower underwater water level indicates better drainage.

[0110] The third verification test result corresponds to a conventional example. In contrast, the first and second verification test results correspond to test examples in which a siphon activation member is provided in the present invention. Comparing the first verification test result using horizontal pipe 176 with the second verification test result using horizontal pipe 185, good drainage was demonstrated in both verification tests, although there was a slight difference in water level, whether the horizontal pipe length was 0.3 m or 1.0 m. This shows that the siphon phenomenon occurs regardless of whether the length of the horizontal pipe is 1.0 m or 0.3 m. The third verification test, which corresponds to the conventional example, used a standpipe with a nominal diameter of 150A, which is twice the nominal diameter of 75A used in the first and second verification tests. It was found that the structure of the present invention exhibited superior drainage performance, even though it used a standpipe with a nominal diameter of 75A, which is half the diameter of the conventional structure. This is thought to be the result of the siphon actuation member 28 provided inside the piping joint utilizing the siphon phenomenon to allow smooth drainage. [Explanation of symbols]

[0111] Building 1A 2 Waist wall 3,45,50,55,60,65,70,75,80,85,90,95,100,105,115,120,125,130,140,155 Piping fittings 5 Roof drain 6 horizontal pipe 7 Vertical pipe 22,66,67,68 Pipe body 22a opening 22A,156 Bottom plate 23,71,76 Horizontal pipe connection 23a,24a Center axis line 24,157 Vertical pipe connection 25 Second vertical pipe connection 28, 42, 131, 146, 158 Siphon starter (flow rectifier) 36 Second vertical pipe 37 Second cover member 46,108 First cover member 106 Reduced diameter section 108e rectifier plate 109 Water flow guide slope S1, S1a, S2, S2a, S2b, S2c, S2d, S2e, S2f, S2g, S2h, S2i, S2j, S2k, S3, S4, S4a Drainage piping system

Claims

1. a first connection portion connected to the upstream first pipe; a second connection portion connected to a downstream second pipe; a rectification portion disposed between the first connection portion and the second connection portion, the rectifying portion has a rectifying plate, The rectifying plates are provided in a plurality at intervals radially around the tube axis of the second connection portion, and protrude toward the tube axis. Piping fittings.

2. The protrusion amount of the rectifying plate varies in the tube axis direction. The piping joint according to claim 1.

3. The flow rectifier is provided so as to extend along the tube axis.

3. The piping joint according to claim 1 or 2.

4. the pipe main body portion having the first connecting portion and the second connecting portion, and the rectifying plate are formed as separate members by injection molding. A piping joint according to any one of claims 1 to 3.

5. The piping joint according to any one of claims 1 to 4; the first tube; and the second pipe.

6. The drainage piping system according to claim 5 , further comprising an eave gutter disposed upstream of the first pipe.

7. A building comprising the drainage piping system according to claim 5 or 6.

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