Pipe fittings, drainage piping systems, and buildings

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 joint, a drainage pipe system, and a building.

Background Art

[0002] In recent years, with the increasing frequency of heavy rainstorms, rainwater pipes tend to be enlarged in order to efficiently drain rainwater from buildings. For example, in the drainage pipe system on the rooftop floor of a building shown in FIG. 46, a frame-shaped roof drain 302 is installed along a portion where a waist wall 301 is erected at a corner portion of the rooftop floor 300 of the building. A horizontal pipe 303 connected to this roof drain 302 is installed so as to horizontally penetrate the waist wall 301. A vertical pipe 306 for drainage 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 the drainage pipe system on the rooftop floor of a building, as shown in FIG. 47, a drainage pipe system is known in which a cheese joint 307 is provided at the connection portion between the horizontal pipe 303 and the vertical pipe 306 instead of the elbow pipe 305. A detachable cover plate 308 is provided on the ceiling portion of the cheese joint 307. Alternatively, as shown in FIG. 48, a drainage pipe system is known in which a drainage mass 309 is provided at the connection portion between the horizontal pipe 303 and the vertical pipe 306 instead of the elbow pipe 305. A detachable cover plate 310 is provided on the ceiling portion of the drainage mass 309.

Prior Art Documents

Non-Patent Documents

[0004]

Non-Patent Document 1

Summary of the Invention

[0005] In the drainage piping system shown in Figure 46, rainwater from the rooftop is introduced into the horizontal pipe 303 via the roof drain 302 and then drained by flowing into the vertical pipe 306 via the elbow pipe 305. In typical drainage piping systems, horizontal pipes 303 and vertical pipes 306 are designed to have the same diameter. However, in order to improve drainage capacity, especially considering measures against recent torrential downpours, there is a trend to increase the diameter of both horizontal pipes 303 and vertical pipes 306.

[0006] However, increasing the diameter of vertical pipes to mitigate heavy rainfall increases the weight of the piping in multi-story buildings. This poses a problem as it necessitates a stronger support structure to withstand the weight of the pipes, or to withstand wind forces, etc. Furthermore, it is conceivable that various consequences will arise, such as an increase in the number of pipe support points using support brackets, the need for stronger support brackets, and in some cases, the need to re-examine the structural strength of the building itself. In addition, it may have various impacts on the design and construction of the building, such as the need to secure storage space for the large-diameter vertical pipes, the need for larger transport machinery, and the need for more man-hours.

[0007] This invention has been made in view of the above problems, and aims to provide a pipe fitting that improves the inflow and drainage of rainwater into a vertical pipe, and a drainage piping system equipped with this pipe fitting. [Means for solving the problem]

[0008] To solve the aforementioned problems, this invention proposes the following means. The pipe fitting of the present invention is characterized by comprising a pipe body, a horizontal pipe connection portion formed in the pipe body and connected to a horizontal pipe, a vertical pipe connection portion formed in the lower part of the pipe body and connected to a vertical pipe, and a flow straightening member provided inside the pipe body. In this invention, rainwater that flows into the main pipe through the horizontal pipe connection is stabilized within the main pipe by a flow straightening member installed inside the main pipe. Since the vertical pipe is connected downstream of the main pipe, the inflow and drainage of rainwater into the vertical pipe can be improved.

[0009] Furthermore, in the aforementioned pipe fitting, the inner diameter of the vertical pipe connection portion may be smaller than the inner diameter of the horizontal pipe connection portion. In this invention, even if the diameter of the horizontal pipe is increased to countermeasures against torrential downpours, for example, the inner diameter of the vertical pipe connection is smaller than the inner diameter of the horizontal pipe connection, so a vertical pipe with a smaller inner diameter can be connected. Even if the horizontal pipes become larger in diameter and the amount of rainwater flowing from the horizontal pipes to the vertical pipes increases, gravity acts on the rainwater flowing through the vertical pipes, causing it to be discharged faster than the rainwater flowing through the horizontal pipes, so there is no problem with drainage capacity. By increasing the diameter of the horizontal pipes to mitigate torrential downpours, the vertical pipes can be made smaller, eliminating the need for increased strength in the support fittings for the vertical pipes. Furthermore, the number of support fittings required can also be reduced. In addition, reducing the diameter of the vertical pipes reduces the load on the building structure. Moreover, eliminating the need for large-diameter vertical pipes reduces the storage space required for them, contributes to the miniaturization of transport heavy machinery, and provides a structure that does not burden the design and construction of the building.

[0010] Furthermore, the pipe fitting may have an opening formed in the upper part of the pipe body, and a first cover member that is detachably attached to the opening. In this invention, for example, if foreign matter accumulates inside the pipe body or becomes clogged with foreign matter, the first lid member can be removed to clean the inside of the pipe body, providing a pipe fitting with excellent maintainability.

[0011] Furthermore, the piping joint may be provided with a water flow guiding slope formed on the lower part of the first cover member, which is inclined with respect to both the central axis of the horizontal pipe connection and the central axis of the vertical pipe connection. In this invention, rainwater flowing from the horizontal pipe into the main body of the pipe is smoothly redirected to the vertical pipe side by hitting a water flow guide slope and changing direction. This makes the flow of rainwater inside the main body of the pipe smoother.

[0012] Furthermore, the piping joint may be provided with a flow straightening plate that is attached to the first cover member and protrudes toward the inside of the pipe body. In this invention, the flow of rainwater from the main pipe section to the vertical pipe connection section can be made smoother by the flow straightening plate.

[0013] Furthermore, the pipe fitting may include a diameter-reducing portion positioned between the pipe body and the vertical pipe connection portion. In this invention, rainwater flowing from the main pipe body towards the vertical pipe can be smoothly introduced by the diameter-reducing section.

[0014] Furthermore, the piping joint may be provided with a flow straightening plate protruding from the inner surface of the pipe body. In this invention, the flow of rainwater from the main pipe section to the vertical pipe connection section can be made smoother by the flow straightening plate.

[0015] Furthermore, in the aforementioned pipe fitting, the vertical pipe connection portion may be eccentrically positioned with respect to the pipe body portion. In this invention, for example, a vertical pipe can be installed closer to or further away from an exterior wall located near a pipe fitting. If the vertical pipe can be placed closer to the exterior wall, the wind pressure acting on the vertical pipe can be reduced, thereby reducing the load on the vertical pipe's support structure due to wind pressure.

[0016] Furthermore, the piping joint may include a second vertical pipe connection portion formed on the upper part of the pipe body, to which a second vertical pipe is connected. In this invention, by having a second vertical pipe connection portion, for example, the pipe fitting (pipe body portion) becomes a tee fitting with a known configuration, and the cost required for the installation of the pipe fitting can be reduced.

[0017] In addition, the pipe joint may include a bottom plate provided inside the pipe body portion. In this invention, by using the bottom plate, for example, various members can be installed inside the pipe body portion or the like.

[0018] The drainage pipe system of the present invention further includes a roof drain installed on the upper floor of a building, a horizontal pipe connected to the roof drain and penetrating the waist wall of the upper floor of the building, a pipe joint as described in any one of the above connected to the outer end of the horizontal pipe with a horizontal pipe connection portion, and a vertical pipe connected to the vertical pipe connection portion. In this invention, a drainage pipe system for treating rainwater flowing from a roof drain into a horizontal pipe can be configured by using a pipe joint that improves the inflow and drainage properties of rainwater into a vertical pipe.

[0019] In addition, in the drainage pipe system, the pipe joint may include a second vertical pipe connection portion formed at the upper part of the pipe body portion to which a second vertical pipe is connected, the second vertical pipe connected to the second vertical pipe connection portion, and a second lid member detachably attached to the second vertical pipe. In this invention, when foreign matter or the like accumulates inside the pipe body portion or clogging due to foreign matter occurs, the second lid member disposed at a position relatively far from the pipe body portion by the second vertical pipe can be removed, and the inside of the pipe joint can be cleaned through the second vertical pipe. Therefore, a drainage pipe system with excellent maintainability can be provided.

Effects of the Invention

[0020] In the pipe joint and the drainage pipe system of the present invention, the inflow and drainage properties of rainwater into the vertical pipe can be improved.

Brief Description of the Drawings

[0021] [Figure 1] It is a cross-sectional view showing an example of a building to which the drainage pipe system according to the first embodiment of the present invention is applied. [Figure 2] It is a cross-sectional view showing a disassembled main part of the drainage pipe system. [Figure 3] This is a perspective view of the first connecting member in the drainage piping system. [Figure 4] This is a perspective view of the siphon activation component in the drainage piping system. [Figure 5] This is a cross-sectional view showing an example of a building to which a drainage piping system according to a first modification of the first embodiment of the present invention is applied. [Figure 6] This is a perspective view of the disassembled reducing socket and siphon activation component in the drainage piping system. [Figure 7] This is a perspective view of the assembled sockets of the same diameter but different diameters and the siphon starter. [Figure 8] This is a cross-sectional view showing an example of a building to which the drainage piping system according to the second embodiment of the present invention is applied. [Figure 9] This is a cross-sectional view of the main components of the drainage piping system, disassembled. [Figure 10] This is a disassembled cross-sectional view of the main parts of a drainage piping system, a first modified example of a second embodiment of the present invention. [Figure 11] This is a disassembled cross-sectional view of the main parts of a drainage piping system, a second modified example of the second embodiment of the present invention. [Figure 12] This is a disassembled cross-sectional view of the main parts of a drainage piping system, a third modified example of the second embodiment of the present invention. [Figure 13] This is a disassembled cross-sectional view of the main parts of a drainage piping system according to a fourth modified example of the second embodiment of the present invention. [Figure 14] This is a plan view of the main components of the drainage piping system. [Figure 15] This is a plan view of the main part of a drainage piping system in a fourth modified example of the second embodiment of the present invention. [Figure 16] This is a plan view of the main part of a drainage piping system in a fourth modified example of the second embodiment of the present invention. [Figure 17] This is a disassembled cross-sectional view of the main parts of a fifth modified example of the second embodiment of the present invention, specifically a drainage piping system. [Figure 18]This is a disassembled cross-sectional view of the main part of a drainage piping system of a sixth modified example of the second embodiment of the present invention. [Figure 19] This 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] This is a side view of the drainage piping system. [Figure 21] This is a cross-sectional view of a drainage piping system in the eighth modified example of the second embodiment of the present invention. [Figure 22] This is a cross-sectional view of a drainage piping system of a ninth modified example of the second embodiment of the present invention. [Figure 23] This is a cross-sectional view of a drainage piping system, a tenth modified example of the second embodiment of the present invention. [Figure 24] This is a partial cross-sectional view showing an example of a building to which a drainage piping system of the 11th modified example of the second embodiment of the present invention is applied. [Figure 25] This is a cross-sectional view showing an example of a building to which the drainage piping system according to the third embodiment of the present invention is applied. [Figure 26] This is a perspective view of the pipe fittings included in the drainage piping system. [Figure 27] This is a perspective view showing a cross-section of the main part of the piping fitting. [Figure 28] This is a cross-sectional view showing the internal structure of the piping fitting. [Figure 29] This is a cross-sectional view along the line A1-A1 shown in Figure 28. [Figure 30] This is an explanatory diagram showing the positional relationship between the vertical pipe connection portion and the main pipe portion in the piping fitting. [Figure 31] This is an explanatory diagram showing the positional relationship between the vertical pipe connection portion and the pipe body portion in a pipe fitting of a first modified example of the third embodiment of the present invention. [Figure 32] This is an explanatory diagram showing the positional relationship between the vertical pipe connection portion and the pipe body portion in a piping joint of a second modified example of the third embodiment of the present invention. [Figure 33] This is a partial cross-sectional view of a pipe fitting according to a third modified example of the third embodiment of the present invention. [Figure 34]This is a front view of the piping fitting. [Figure 35] This is a partially transparent perspective view of a pipe fitting according to a fourth modified example of the third embodiment of the present invention. [Figure 36] This is a cross-sectional view showing an example of a building to which the drainage piping system according to the fourth embodiment of the present invention is applied. [Figure 37] This is a disassembled perspective view of the reducing socket and siphon starter used in the same piping fitting. [Figure 38] This is a perspective view of the assembled sockets of the same diameter but different diameters and the siphon starter. [Figure 39] This is a cross-sectional view showing an example of a building to which a drainage piping system according to the first modification of the fourth embodiment of the present invention is applied. [Figure 40] This is a perspective view showing a portion of a pipe fitting in the drainage piping system that has been broken. [Figure 41] This is a cross-sectional view along the line A2-A2 shown in Figure 40. [Figure 42] This is a perspective view showing an overview of the verification test conducted to examine the effects of the length of the horizontal pipe. [Figure 43] This is an explanatory diagram showing the configuration of a verification test apparatus equipped with a horizontal tube 0.3m in length. [Figure 44] This is an explanatory diagram showing the configuration of a verification test apparatus equipped with a horizontal pipe 1.0 m in length. [Figure 45] Figures 19 and 20 show graphs illustrating the test results obtained using the verification test apparatus. [Figure 46] This is a diagram showing a first conventional example of a drainage piping system. [Figure 47] This is a diagram showing a second conventional example related to a drainage piping system. [Figure 48] This is a diagram showing a third conventional example related to a drainage piping system. [Modes for carrying out the invention]

[0022] (First Embodiment) Hereinafter, a first embodiment of the pipe fitting and drainage piping system according to the present invention will be described with reference to Figures 1 to 7. The drainage piping system equipped with the pipe fittings according to this embodiment can be applied, for example, to the drainage of buildings such as office buildings and condominiums. The piping joint 3 of the first embodiment shown in Figure 1 is installed on the outside of the connection between the rooftop floor (the floor that makes up the roof) 1 of building 1A and the parapet wall 2 erected at the corner of this rooftop floor 1. The parapet wall 2 is the parapet wall of the rooftop floor of building 1A. A frame-shaped roof drain 5 is installed inside the joint between the rooftop floor 1 and the parapet wall 2. A horizontal pipe 6, which penetrates the parapet wall 2 horizontally, is connected to this roof drain 5. A pipe fitting 3 is connected to the outer end of the horizontal pipe 6. A vertical pipe 7 is connected to the lower part of the pipe fitting 3. In the first embodiment, the drainage piping system S1 is configured with a roof drain 5, a horizontal pipe 6, a pipe fitting 3, a vertical pipe 7, a second vertical pipe 36 (described later), and a second cover member 37. The vertical pipe 7 extends downward along the outer wall 8 of building 1A. The vertical pipe 7 is connected to a drainage facility such as a catch basin (not shown) or other drainage pipe located on the ground near building 1A.

[0023] The roof drain 5 has an L-shaped frame 12 consisting of a bottom plate 10 and side plates 11. A cylindrical member 13 for connecting pipes is integrated into the frame 12. A through hole 11a is formed on the bottom side of the side plate 11. The cylindrical member 13 extends outward from this through hole 11a. The base plate 10 is installed at the corner of the rooftop floor 1, and the side plate 11 is in close contact with the bottom of the parapet wall 2. The roof drain 5 is installed at the corner of the rooftop floor 1 of building 1A. At that time, the cylindrical member 13 is inserted into the through hole 2a formed in the bottom of the parapet wall 2. An L-shaped strainer 17, equipped with multiple water passage holes, is detachably attached to the frame 12 by bolts 18 and nuts 19. The frame 12 and the strainer 17 constitute the roof drain 5.

[0024] The bottom plate 10 of the roof drain 5 and the bottom of the strainer 17 hold down the edge of the waterproof sheet 15 on the rooftop floor 1 side. Similarly, the side plate 11 and the top of the strainer 17 hold down the edge of the waterproof sheet 16 on the parapet wall 2 side. Note that 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 a general-purpose roof drain, such as a frame-type or box-type structure.

[0025] The horizontal pipe 6 is for drainage. The horizontal pipe 6 extends along a horizontal plane with an appropriate water slope. A portion of the horizontal pipe 6 in the longitudinal direction is located within the through-hole 2a of the low wall 2. The first end of the horizontal pipe 6 is connected to the cylindrical member 13 of the roof drain 5. The second end of the horizontal pipe 6, opposite to the first end, protrudes outside the through-hole 2a. The horizontal pipe 6 penetrates the low wall 2. The horizontal pipe 6 is made of polyvinyl chloride resin or the like.

[0026] As shown in Figures 1 and 2, the pipe fitting 3 comprises a pipe body 22, a horizontal pipe connection 23, a vertical pipe connection 24, a second vertical pipe connection 25, a first connecting member 26, a second connecting member 27, and a siphon activating member (flow straightening member) 28. The pipe body 22, horizontal pipe connection 23, vertical pipe connection 24, and second vertical pipe connection 25 constitute the fitting body 30. In Figure 2, the socket 33 and vertical pipe 7 are shown by dashed lines. The pipe fitting 3 may also be a pipe box member. The main pipe section 22 is a so-called tee pipe, forming a T-shape. The main pipe section 22 is constructed by providing a connecting section, which is an opening communicating with the inside of the straight pipe section, on the side of the straight pipe section. The main pipe section 22 is installed on the outside of the low wall 2 so that the central axis of the straight pipe section is aligned with the vertical direction. When installing the main pipe section 22, it is acceptable to install it with the central axis of the straight pipe section slightly tilted from the vertical direction.

[0027] The horizontal pipe connection section 23, the vertical pipe connection section 24, and the second vertical pipe connection section 25 are all cylindrical. The horizontal pipe connection section 23 is formed coaxially with the connection section of the main pipe section 22. The second end of the horizontal pipe 6 is positioned inside the horizontal pipe connection section 23. The horizontal pipe connection section 23 and the horizontal pipe 6 are bonded to each other, thereby connecting the horizontal pipe connection section 23 to the outer end of the horizontal pipe 6. The vertical pipe connection section 24 is formed coaxially with the straight pipe section at the lower part of the main pipe section 22. The inner diameter of the vertical pipe connection section 24 is larger than the inner diameter of the straight pipe section. The second vertical pipe connection 25 is formed on the upper part of the straight pipe section of the main pipe section 22. The inner diameter of the second vertical pipe connection 25 is larger than the inner diameter of the straight pipe section. In this example, the second vertical pipe connection 25 has the same shape as the vertical pipe connection 24.

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

[0029] As shown in Figures 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 annular in shape. The small diameter cylindrical portion 26b and the large diameter cylindrical portion 26d are cylindrical in shape. The first flange portion 26a is positioned to follow the horizontal plane. The inner diameter of the first flange portion 26a is smaller than the inner diameter of the pipe body portion 22 of the pipe fitting 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 to the lower end of the pipe body portion 22 from the radially inner side of the pipe body portion 22. The second flange portion 26c protrudes radially outward from the lower end of the small-diameter cylindrical portion 26b, along its entire circumference. The large-diameter cylindrical portion 26d protrudes downward from the outer peripheral edge of the second flange portion 26c. The large-diameter cylindrical portion 26d is fitted into the upper end of the vertical pipe connection portion 24 from the radially inner side of the vertical pipe connection portion 24. The first connecting member 26, configured as described above, is fixed to the joint body 30 with an adhesive or the like. Furthermore, as shown by the dashed line L1 in Figure 3, the vertical length of the large-diameter cylindrical portion 26d of the first connecting member 26 may be relatively long.

[0031] As shown in Figure 2, the second connecting member 27 has a connecting cylindrical portion 27a and a flange portion 27b. The connecting cylinder portion 27a is cylindrical. An internal threaded portion (not shown) is formed on the inner circumferential surface of the connecting cylinder portion 27a. The flange portion 27b is annular in shape. The flange portion 27b protrudes radially outward from the upper end of the connecting cylinder portion 27a along its entire circumference. The flange portion 27b of the second connecting member 27 is in contact with the first flange portion 26a of the first connecting member 26 from below the first flange portion 26a. The vertical pipe 7 is connected to the connecting cylindrical portion 27a of the second connecting member 27 via a socket 33. In other words, the vertical pipe 7 is connected to the vertical pipe connecting portion 24 via the first connecting member 26, the second connecting member 27, and the socket 33. The vertical pipe 7 extends downward from the socket 33.

[0032] As shown in Figures 2 and 4, for example, the siphon activating member 28 has a lid member 28a, a plurality of vertical ribs 28b, a flange portion 28c, a connecting cylinder portion 28d, and a gripping rib 28e. The lid member 28a is disc-shaped and arranged along a horizontal plane. The lid member 28a may have through holes. Multiple vertical ribs 28b extend downward from the lower surface of the lid member 28a. The flange portion 28c is provided at the lower end of a plurality of vertical ribs 28b. The opening between the cover member 28a and the flange portion 28c is the rainwater inlet opening 28f. On the central side of the lower surface of the cover member 28a, a guide (not shown) is formed to direct the rainwater flowing in from the inlet opening 28f downwards. The connecting cylinder portion 28d extends downward from the flange portion 28c. An external thread (not shown) is formed on the outer circumferential surface of the connecting cylinder portion 28d. The gripping rib 28e is formed on the upper side of the lid member 28a.

[0033] In the siphon activating member 28, a flange portion 28c is formed on the outer circumference of the upper end opening of the connecting cylinder portion 28d. The upper end opening of the connecting cylinder portion 28d is the drain outlet. The size, height, and shape of each part of the siphon activating member 28 are adjusted so that the area of ​​the inlet opening 28f is larger than the opening area at the upper end of the connecting cylinder portion 28d (the opening area of ​​the outlet portion). In this embodiment, the area of ​​the inlet opening 28f can be determined by the product of the circumference of the circular lid member 28a and the height H from the flange portion 28c to the lid member 28a.

[0034] The preferred inner diameter of the connecting pipe portion 28d for providing the lid member 28a is 50 mm or more and 170 mm or less. A more preferable inner diameter of the connecting pipe portion 28d is 70 mm or more and 170 mm or less. In other words, by setting the outer diameter of the opening of the outlet portion of the connecting pipe portion 28d to the lower limit of 50 mm or more, the large flow rate of rainwater draining through the siphon activating member 28 can be drained smoothly. Furthermore, by limiting the upper limit to 170 mm or less, the size required when housing it in the pipe fitting 3 is reduced, preventing the pipe fitting 3 from becoming larger.

[0035] In this example, the inner diameters of the connecting pipe sections 27a and 28d are set to be approximately half the inner diameter of the straight pipe section of the main pipe section 22. Also, since the inner diameters of the connecting pipe sections 27a and 28d are formed to be approximately half the inner diameter of the horizontal pipe 6, the inner diameter of the vertical pipe 7 is formed to be approximately half the inner diameter of the horizontal pipe 6. In this embodiment, the inner diameter of the vertical pipe 7 is formed to be about half the inner diameter of the horizontal pipe 6, but the inner diameter of the vertical pipe 7 may be formed to be about half to one-half the inner diameter of the horizontal pipe 6. That is, the inner diameters of the connecting pipe sections 27a and 28d may be in the range of about half to one-half the inner diameter of the main pipe section 22. In any case, in this embodiment, the inner diameters of the connecting pipe sections 27a and 28d (which are about the same as the inner diameter of the vertical pipe 7) are equal to or smaller than the inner diameter of the straight pipe section of the main pipe section 22 (which is about the same as the inner diameter of the horizontal pipe 6).

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

[0037] The second connecting member 27 and the siphon activating member 28 are fixed to the joint 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 by screwing the external thread portion of the siphon activating member 28 into the internal thread portion of the second connecting member 27. As shown in Figure 2, the siphon activating member 28 is located inside the main body of the pipe 22.

[0038] As shown in Figure 1, the lower end of the second vertical pipe 36 is connected to the second vertical pipe connection part 25 of the joint body 30 (piping joint 3). The second vertical pipe 36 is constructed in the same way as the vertical pipe 7. The second vertical pipe 36 extends upward from the second vertical pipe connection part 25. For example, the second vertical pipe 36 extends to the vicinity of the upper end of the low wall 2. The second lid member 37 is a cap-shaped member comprising a top plate 37a and a connecting tube 37b provided on one side of the top plate 37a. It is desirable that the second lid member 37 has an air vent hole. The second lid member 37 is detachably attached to the upper end of the second vertical pipe 36 via a socket 38. The connecting tube 37b is detachably fitted onto 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 described above will be explained. Rainwater flows along the waterproof sheet 15 and, upon reaching the roof drain 5, passes through the perforations 11a and flows into the horizontal pipe 6, then flows into the main pipe section 22 via the horizontal pipe connection section 23 of the pipe fitting 3. The rainwater that flows into the main pipe section 22 changes its direction of flow downward and flows through the siphon activating member 28. The siphon activating member 28 stabilizes the flow of the rainwater inside the main pipe section 22. The rainwater is then discharged through the vertical pipe 7 to the drainage equipment side, such as a drain pipe.

[0040] On the other hand, in recent years, due to measures against torrential downpours, there has been a tendency to increase the diameter of the horizontal pipe 6 in order to improve drainage capacity. In the structure of this embodiment, the inner diameter of the horizontal pipe 6 is equal to the inner diameter of the vertical pipe 7, or the inner diameter of the vertical pipe 7 is smaller. When rainwater flows into the vertical pipe 7, gravity acts on the rainwater flowing in the vertical pipe 7, so the rainwater flowing in the vertical pipe 7 is discharged more smoothly than the rainwater flowing in the horizontal pipe 6. Therefore, even if a large amount of rainwater flows into the vertical pipe 7 through the horizontal pipe 6, the flow velocity of the rainwater flowing in the vertical pipe 7 will be faster, and sufficient drainage can be obtained by the vertical pipe 7 even if the vertical pipe 7 has a small inner diameter. As an example, if the nominal diameter of the horizontal pipe 6 is 150 mm, the nominal diameter of the vertical pipe 7 can be 75 mm. The nominal diameter of the vertical pipe 7 may also be 100 mm, etc.

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

[0042] Next, the operation of the siphon starting member 28 will be explained. When viewed from above, the siphon activating member 28 blocks the opening of the outlet (the upper end opening of the connecting cylinder portion 28d) with drainage, and even when a large amount of rainwater flows in through the inlet opening during heavy rain, it seals the vertical pipe 7 with water without drawing in air, keeping it full of water. As a result, a siphon effect can be generated on the downstream side. In this way, the siphon activating member 28 enables the vertical pipe 7 to exhibit high drainage functionality. Therefore, even if a large amount of rainwater flows from the horizontal pipe 6 into the pipe fitting 3, good drainage capacity can be obtained.

[0043] Up to this point, the description has focused on an example where this embodiment is applied to a roof drain 5 installed on the rooftop floor 1 of building 1A. However, since roof drains 5 can also be installed on balcony floors, veranda floors, terrace floors, etc., the structure of the earlier embodiment of this application can also be applied to roof drains installed on balcony floors, veranda floors, terrace floors, etc.

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

[0045] As described above, in the pipe fitting 3 of this embodiment, rainwater that flows into the pipe body 22 through the horizontal pipe connection part 23 connected to the horizontal pipe 6 becomes a stable flow inside the pipe body 22 due to the siphon activation member 28 provided inside the pipe body 22. Since the vertical pipe 7 is connected downstream of the pipe body 22, the inflow and drainage of rainwater into the vertical pipe 7 can be improved.

[0046] The pipe fitting 3 includes a second vertical pipe connection portion 25. Therefore, for example, the pipe fitting 3 (pipe body portion 22) can be a tee fitting with a known configuration, which can reduce the cost required for the installation of the pipe fitting 3.

[0047] Furthermore, in the drainage piping system S1 of this embodiment, a drainage piping system can be configured to process rainwater flowing from the roof drain 5 into the horizontal pipe 6 by using a pipe fitting 3 that improves the inflow and drainage of rainwater into the vertical pipe 7. The pipe fitting 3 is equipped with a second vertical pipe connection 25, and the drainage piping system S1 is equipped with a second vertical pipe 36 and a second cover member 37. Therefore, if foreign matter accumulates inside the pipe body 22 or if it becomes clogged with foreign matter, the second cover member 37, which is located relatively far from the pipe body 22, can be removed by the second vertical pipe 36, and the inside of the pipe fitting 3 can be cleaned through the second vertical pipe 36. This provides a drainage piping system S1 with excellent maintainability.

[0048] Furthermore, as shown in Figure 5, the drainage piping system S1a of the first modified example may be equipped with a reducing socket 41 and a siphon activating member 42 instead of the first connecting member 26, the second connecting member 27, and the siphon activating member 28 of the drainage piping system S1 of this embodiment. In other words, the pipe fitting 3a of the first modified example is equipped with a reducing socket 41 and a siphon activating member 42 instead of the first connecting member 26, the second connecting member 27, and the siphon activating member 28 of the pipe fitting 3 of this 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 formed in a cylindrical shape and are arranged coaxially with each other. The outer diameter of the small diameter portion 41b is smaller than the outer diameter of the large diameter portion 41a. The small diameter portion 41b is located below the large diameter portion 41a. In the connecting portion 41c, the outer diameter gradually decreases as it goes downwards. The connecting portion 41c is located 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] As shown in Figure 5, the large-diameter section 41a is located within the vertical pipe connection section 24 and connected to the vertical pipe connection section 24. The upper end of the vertical pipe 7 is located within the small-diameter section 41b and connected to the small-diameter section 41b. As shown in Figures 6 and 7, the siphon activating member 42 is equipped with a tapered portion 42a in place of the gripping rib 28e of the siphon activating member 28 in this embodiment. The tapered portion 42a is cylindrical. The outer diameter of the tapered portion 42a gradually increases as it extends upward. The outer diameter of the upper end of the tapered portion 42a is larger than the outer diameter of the connecting cylinder portion 28d. The tapered portion 42a is located at the lower end of the connecting cylinder portion 28d.

[0051] The siphon activating member 42 is connected to the reducing socket 41 such that the tapered portion 42a contacts the connecting portion 41c from above. For example, the siphon activation member 42 is an existing component and is separate from the joint body 30.

[0052] The drainage piping system S1a configured as described above can 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 Figures 8 to 24. The same reference numerals are used for parts identical to those in the previous embodiment, and their descriptions will be omitted. Only the differences will be described. As shown in Figure 8, the drainage piping system S2 of this embodiment is equipped with a pipe fitting 45 in place of the pipe fitting 3 of the drainage piping system S1 of the first embodiment.

[0054] The pipe fitting 45 is equipped with a first cover member 46 in place of the second vertical pipe connection portion 25 of the pipe fitting 3. The height of the main pipe section 22 is slightly larger than the outer diameter of the horizontal pipe connection section 23. Therefore, the uppermost position of the horizontal pipe connection section 23 is located below the upper end of the main pipe section 22. The lowermost position of the horizontal pipe connection section 23 is located near the bottom of the main pipe section 22.

[0055] Figure 9 shows the enlarged internal cross-sectional structure of the pipe fitting 45. An opening 22a is formed at the upper part of the straight pipe section of the main pipe body 22. The pipe fitting 45 is equipped with a bottom plate 22A located inside the pipe body 22. In the configuration shown in Figure 9, the lowest end position of the horizontal pipe connection 23 and the bottom plate 22A are at approximately the same height. The bottom plate 22A is for housing components such as the siphon activation member 28. A through hole 22d is formed in the center of the bottom plate 22A to allow the vertical pipe 7 to pass through. In the main body of the pipe 22, a cylindrical vertical pipe connection portion 24 is formed in the portion below the bottom plate 22A. The pipe body 22, the horizontal pipe connection 23, the vertical pipe connection 24, and the bottom plate 22A constitute the joint body 30A. For example, the joint body 30A is a new component.

[0056] In the siphon activating member 28, the outer diameter of the connecting cylinder portion 28d is formed to be slightly smaller than the inner diameter of the through hole 22d in the bottom plate 22A. In the main body of the pipe 22, a second connecting member 27 is positioned on the lower side of the bottom plate 22A. The siphon activating member 28 is attached to the bottom plate 22A of the main body of the pipe 22 by screwing the external thread portion of the connecting cylinder portion 28d of the siphon activating member 28 onto the internal thread portion of the second connecting member 27. In other words, the siphon activating member 28 is fixed to the bottom plate 22A by sandwiching the bottom plate 22A between the siphon activating member 28 and the second connecting member 27. Note that Figure 9 shows the siphon activating member 28 and the second connecting member 27 with the screws released and separated from the bottom plate 22A. In the installed state of the siphon activating member 28 and the second connecting member 27, the siphon activating member 28 and the second connecting member 27 are integrated by screwing them together.

[0057] The first lid member 46 is configured in the same way as the second lid member 37. That is, the first lid member 46 has a top plate 46a and a connecting tube 46b, which are configured in the same way as the top plate 37a and connecting tube 37b of the second lid member 37. The first lid member 46 is detachably attached to the opening 22a of the pipe body 22.

[0058] As described above, the pipe fitting 45 of this embodiment can improve the inflow and drainage of rainwater into the vertical pipe 7. Furthermore, the pipe fitting 45 is equipped with a first cover member 46. For example, if foreign matter accumulates inside the pipe body 22 or if it becomes clogged with foreign matter, the first cover member 46 can be removed to clean the inside of the pipe body 22, providing a pipe fitting 45 with excellent maintainability. The pipe fitting 45 is equipped with a bottom plate 22A. Therefore, by utilizing the bottom plate 22A, various components such as a siphon activating member 28 can be installed inside the pipe body 22.

[0059] Figure 10 shows a drainage piping system S2a of a first modified example of the second embodiment according to the present invention. The pipe fitting 50 provided in the drainage piping system S2a has a pipe body portion 22, a horizontal pipe connection portion 23, and a vertical pipe connection portion 24, which is equivalent to the pipe fitting 45 of the second embodiment. The pipe fitting 50 differs from the pipe fitting 45 in that the inner diameter of the pipe body portion 22 is larger than the inner diameter of the pipe body portion 22 of the pipe fitting 45. It also differs from the pipe fitting 45 in that the inner diameter of the vertical pipe connection portion 24 is larger than the inner diameter of the vertical pipe connection portion 24 of the pipe fitting 45. For example, in pipe fitting 45, the size of the horizontal pipe 6 was a nominal diameter of 150A, and the size of the vertical pipe 7 was a nominal diameter of 75A. In pipe fitting 50, the size of the horizontal pipe 6 was a nominal diameter of 150A, and the size of the pipe body 22 and the vertical pipe 7 were a nominal diameter of 100A. In pipe fitting 50, because the nominal diameter of the pipe body 22 is larger, the upper side of the side wall of the pipe body 22 is formed to be thicker than the side wall of the pipe body 22 of pipe fitting 45. In the pipe fitting 50, the other components are the same as those of the pipe fitting 45.

[0060] As with pipe fitting 50, the size of the vertical pipe 7 does not have to be half the size of the horizontal pipe 6. The same effects and advantages as those of pipe fitting 45 can be obtained with pipe fitting 50.

[0061] Figure 11 shows a drainage piping system S2b of a second modified example of the second embodiment according to the present invention. The pipe fitting 55 provided in the drainage piping system S2b has a pipe body portion 22, a horizontal pipe connection portion 23, and a vertical pipe connection portion 24, which is equivalent to the pipe fitting 45 of the second embodiment. In pipe fitting 45, the horizontal pipe 6 had a nominal diameter of 150A, and the vertical pipe 7 had a nominal diameter of 75A. In pipe fitting 55, the horizontal pipe 6 had a nominal diameter of 100A, and the pipe body 22 and vertical pipe 7 had nominal diameters of 75A. In the pipe fitting 55, the other components are the same as those of the pipe fitting 45. The same effects and advantages as those of the pipe fitting 45 can be obtained with the pipe fitting 55.

[0062] Figure 12 shows a drainage piping system S2c of a third modified example of the second embodiment according to the present invention. The pipe fitting 60 provided in the drainage piping system S2c has a pipe body portion 22, a horizontal pipe connection portion 23, and a vertical pipe connection portion 24, which is equivalent to the pipe fitting 45 of the second embodiment. In pipe fitting 45, the horizontal pipe 6 had a nominal diameter of 150A, and the vertical pipe 7 had a nominal diameter of 75A. In pipe fitting 60, the horizontal pipe 6 had a nominal diameter of 100A, and the pipe body 22 and vertical pipe 7 both had a nominal diameter of 100A. In the pipe fitting 60, the other components are the same as those of the pipe fitting 45. As in the drainage piping system S2b of the second modified example of the second embodiment, the nominal diameter size of the horizontal pipe 6 and the vertical pipe 7 may be the same. The same effects and advantages as those of the pipe fitting 45 can be obtained with the pipe fitting 60.

[0063] Figures 13 and 14 show a drainage piping system S2d of a fourth modified example of the second embodiment according to the present invention. The configuration of the pipe fitting 65 provided in the drainage piping system S2d, which has a pipe body portion 66, a horizontal pipe connection portion 23, and a vertical pipe connection portion 24, is equivalent to that of the pipe fitting 45 of the second embodiment. The pipe fitting 65 is characterized by the fact that the pipe body portion 66 has a quadrangular shape in plan view. There are no particular restrictions on the plan view shape of the pipe body portion 66; as shown in Figure 15, it may be an elliptical (or circular) pipe body portion 67, or as shown in Figure 16, it may be a pipe body portion 68 that is circular in plan view in half and quadrangular in the other half in plan view. The rectangular pipe body 66 shown in Figures 13 and 14 can be installed closer to the adjacent wall, thus providing a more stable support structure when installed on a wall.

[0064] Figure 17 shows a fifth modified example of the drainage piping system S2e of the second embodiment according to the present invention. The pipe fitting 70 of the drainage piping system S2e has a pipe body portion 22, a horizontal pipe connection portion 71, and a vertical pipe connection portion 24, which is equivalent to the pipe fitting 45 of the second embodiment. In the pipe fitting 70, the horizontal pipe connection portion 71 does not have a branch pipe portion. The horizontal pipe connection portion 71 differs in that it has a connection hole 72 formed on the side surface of the pipe body portion 22 and a thickened portion 73 formed around its outer circumference. The horizontal pipe connection portion 71 may be constructed from a connection hole 72 and a thickened portion 73, as shown in the horizontal pipe connection portion 71. The same effects and advantages as those of the pipe fitting 45 can be obtained with the pipe fitting 70.

[0065] Figure 18 shows a drainage piping system S2f of a sixth modified example of the second embodiment according to the present invention. The pipe fitting 75 provided in the drainage piping system S2f has a pipe body portion 22, a horizontal pipe connection portion 76, and a vertical pipe connection portion 24, which is equivalent to the pipe fitting 45 of the second embodiment. In the pipe fitting 75, the horizontal pipe connection portion 76 does not have a branch pipe portion, and is different in that it consists of a connection hole 77 formed on the side of the central part in the height direction of the pipe body portion 22 and a thickened portion 78 formed on its outer circumference. The horizontal pipe connection portion 76 may be formed from a connection hole 77 and a thick-walled portion 78, as in the horizontal pipe connection portion 56, and its formation position may be in the center of the pipe body portion 22 in the height direction. In the structure shown in Figure 18, drainage from the horizontal pipe 6 flows into the main pipe section 22 from a position higher than the bottom plate 22A or the siphon activation member 28. The same effects and advantages as those of the pipe fitting 70 can be obtained with the pipe fitting 75.

[0066] Figures 19 and 20 show a drainage piping system S2g of a seventh modification of the second embodiment according to the present invention. The configuration of the pipe fitting 80 in the drainage piping system S2g, which has a pipe body portion 22, a horizontal pipe connection portion 23, and a vertical pipe connection portion 24, is equivalent to that of the pipe fitting 45 in the second embodiment. Furthermore, the configuration in which a horizontal pipe 6 is connected to the horizontal pipe connection portion 23 and a vertical pipe 7 is connected to the vertical pipe connection portion 24 is also equivalent. The piping joint 80 is characterized by the fact that the vertical pipe 7 is connected to the vertical pipe connection section 24 via an S-shaped elbow pipe 81. By positioning the vertical pipe 7 via the elbow pipe 81, the vertical pipe 7 can be positioned closer to the wall surface of the low wall 2 compared to the drainage piping system S2 shown in Figure 8. By positioning the vertical pipe 7 close to the wall, it can be positioned in close proximity to the wall surface of the low wall 2 and the exterior wall surface of the floor below. This allows for a shorter length of the brackets used to fix the vertical pipe 7 to the low wall 2 and the exterior wall, thereby stabilizing the mounting structure of the vertical pipe 7 using the brackets.

[0067] Figure 21 shows a drainage piping system S2h of the eighth modified example of the second embodiment according to the present invention. The pipe fitting 85 provided in the drainage piping system S2h has a pipe body portion 22, a horizontal pipe connection portion 23, and a vertical pipe connection portion 24, which is equivalent to the pipe fitting 45 of the second embodiment. The pipe fitting 85 is characterized in that a through-hole 22d is not formed in the bottom plate 22A of the pipe body 22. The pipe fitting 85 is, as an example, a pipe fitting at the factory shipment stage before being attached to the upper end of the vertical pipe 7. After manufacturing the pipe fittings 85 at the factory, they are transported to the installation site, where workers can form through-holes 22d of the required inner diameter in the base plate 22A to match the size of the vertical pipe at the site. By forming the through-holes 22d of the required inner diameter in the base plate 22A, the vertical pipe connection section 24 is completed. The same effects and advantages as those of the pipe fitting 45 can be obtained with the pipe fitting 85.

[0068] Figure 22 shows a drainage piping system S2i of a ninth modified example of the second embodiment according to the present invention. The pipe fitting 90 provided in the drainage piping system S2i has a pipe body portion 22, a horizontal pipe connection portion 23, and a vertical pipe connection portion 24, which is equivalent to the pipe fitting 45 of the second embodiment. The pipe fitting 90 is characterized in that no through-holes 22d are formed in the bottom plate 22A of the pipe body 22. The pipe fitting 90 is a pipe fitting at the factory shipment stage, for example, before it is attached to the upper end of the vertical pipe 7. After manufacturing the pipe fittings 90 at the factory, they are transported to the installation site, where workers can form the necessary inner diameter through-holes 22d in the base plate 22A to match the size of the vertical pipe at the site. By forming the necessary inner diameter through-holes 22d in the base plate 22A, the vertical pipe connection section 24 is completed. The same effects and advantages as those of the pipe fitting 50 (pipe fitting 45) can be obtained with the pipe fitting 90.

[0069] Figure 23 shows a drainage piping system S2j of a tenth modified example of the second embodiment according to the present invention. The pipe fitting 95 of the drainage piping system S2j has a pipe body portion 22, a horizontal pipe connection portion 23, and a vertical pipe connection portion 24, which is equivalent to the pipe fitting 50 of the first modified example of the second embodiment. The pipe fitting 95 is characterized by having a through-hole 22e for a nominal diameter of 75A formed in the bottom plate 22A of the pipe body 22. Since the pipe body 22 is sized for a nominal diameter of 100A, the size of the bottom plate 22A could also accommodate a through-hole of the size of a 100A nominal diameter, but a 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 10th modified example, a through-hole 22e corresponding to a nominal diameter of 75A may be formed in the bottom plate 22A, which is capable of forming a through-hole corresponding to a nominal diameter of 100A. In this pipe fitting 95, a pipe fitting corresponding to a nominal diameter of 100A is applied to a nominal diameter of 75A, and a pipe fitting of a specific size can be used for two different sizes of vertical pipes. The same effects and advantages as those of the pipe fitting 50 can be obtained with the pipe fitting 95.

[0070] Figure 24 shows a drainage piping system S2k of an eleventh modified example of the second embodiment according to the present invention. The pipe fitting 100 of the drainage piping system S2k is provided with a second vertical pipe connection portion 25 relative to the pipe fitting 45 of the second embodiment. The second vertical pipe 36, the second cover member 37, and the like are connected to the second vertical pipe connection part 25 of the pipe fitting 100.

[0071] Incidentally, in the pipe fittings described so far, a detachable first cover member 46, etc., is provided to allow the inside of the pipe body 22, etc. to be opened. This is so that the inside of the pipe body 22 can be cleaned by removing the first cover member 46. It is also to facilitate the installation of the siphon activating member 28. However, the first cover member 46, etc., is not an essential component and can be omitted. If the horizontal pipe connection section 23 is sufficiently large, or if the inside of the pipe body section 22 can be cleaned from the inside of the lower wall 2, the first cover member 46, etc., may be omitted, and the upper part of the pipe body section 22 may be closed.

[0072] (Third embodiment) Next, a third embodiment of the present invention will be described with reference to Figures 25 to 35. The same reference numerals are used for parts identical to those in the previous embodiments, and their descriptions will be omitted. Only the differences will be described. As shown in Figure 25, the drainage piping system S3 of this embodiment is equipped with a pipe fitting 105 instead of the pipe fitting 45 of the drainage piping system S2 of the second embodiment. The pipe fitting 105 of the third embodiment does not include a siphon activation member. In the pipe fitting 105, the inner diameter of the horizontal pipe connection portion 23 is such that the horizontal pipe 6 can be inserted as described above, but the inner diameter of the straight pipe portion of the main pipe portion 22 is formed to be approximately the same as the inner diameter of the horizontal pipe connection portion 23. The horizontal pipe connection portion 23 is formed slightly below the upper end of the main pipe portion 22. In the configurations shown in Figures 25 to 27, the height dimension of the main pipe section 22 is slightly larger than the outer diameter of the horizontal pipe connection section 23. The uppermost position of the horizontal pipe connection section 23 is located slightly below the upper end of the main pipe section 22. The lowermost position of the horizontal pipe connection section 23 is located near the bottom of the main pipe section 22.

[0073] In the third embodiment, the inner diameter of the vertical pipe connection portion 24 is approximately half the inner diameter of the main pipe portion 22. Also, since the inner diameter of the vertical pipe connection portion 24 is approximately half the inner diameter of the horizontal pipe 6, the inner diameter of the vertical pipe 7 is approximately half the inner diameter of the horizontal pipe 6. In this embodiment, the inner diameter of the vertical pipe connection portion 24 is smaller than the inner diameter of the horizontal pipe connection portion 23. In this embodiment, the inner diameter of the vertical pipe 7 is approximately half the inner diameter of the horizontal pipe 6, but the inner diameter of the vertical pipe 7 may be formed to be approximately half to two-thirds the inner diameter of the horizontal pipe 6. That is, the inner diameter of the vertical pipe connection portion 24 may be in the range of approximately half to two-thirds the inner diameter of the pipe body portion 22. In any case, in this embodiment, the inner diameter of the vertical pipe connection portion 24 (approximately equal to the inner diameter of the vertical pipe 7) is smaller than the inner diameter of the main pipe portion 22 (approximately equal to the inner diameter of the horizontal pipe 6).

[0074] Figure 26 shows the overall shape of the pipe fitting 105, and Figure 27 shows the internal cross-sectional structure of the pipe fitting 105. As shown in Figures 26 and 27, the pipe fitting 105 replaces the siphon activation member 28 of the pipe fitting 45 with a diameter reduction portion 106, a flow straightening plate 107, a first cover member 108, and a water flow guide slope 109. The reduced diameter section 106 is cylindrical, and its inner and outer diameters gradually decrease as it extends downwards. The reduced diameter section 106 is positioned between the main pipe section 22 and the vertical pipe connection section 24. The pipe fitting 105 is equipped with multiple flow straightening plates 107. The multiple flow straightening plates 107 are positioned at predetermined intervals around the circumferential circumference of the main pipe section 22 and the reduced diameter section 106, extending from the lower end of the main pipe section 22 to the lower end of the reduced diameter section 106. The diameter-reduced portion 106 is integrated with the main pipe portion 22 and the vertical pipe connection portion 24.

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

[0076] As shown in Figures 27 and 28, the first lid member 108 is a cylindrical member that is fitted into the opening 22a. The first lid member 108 is detachably attached to the opening 22a of the pipe body 22. An extension portion 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 pipe body portion 22 to the bottom side of the pipe body portion 22. The water flow guiding slope 109 is formed on the extension 108a, that is, on the lower part of the first cover member 108. When the opening 22a is closed with the first cover member 108, the water flow guiding slope 109 is inclined with respect to both the central axis 23a of the horizontal pipe connection 23 and the central axis 24a of the vertical pipe connection 24. As shown in Figure 27, this water flow guiding slope 109 is in the shape of an arc that is concave diagonally upward.

[0077] Because a water flow guide slope 109 is formed on the extension portion 108a, the vertical thickness of the first cover member 108 is thinner on the side of the horizontal pipe connection portion 23 and gradually thickens towards the opposite side. For this reason, the lower end 108c of the extension portion 108a extends to the lower side of the pipe body portion 22. More specifically, the lower end 108c of the extension portion 108a extends to a height position corresponding to the lowest end position of the horizontal pipe connection portion 23. The water flow guiding slope 109 of the first cover member 108 is provided to smoothly change the direction of rainwater flow downwards when the amount of rainwater flowing in from the horizontal pipe connection 23 side increases, thereby adjusting the flow of rainwater to prevent turbulence from occurring inside the pipe joint 105. In addition, the first cover member 108 is fitted onto the pipe body 22 so that it can be removed when it becomes necessary to clean the inside of the pipe joint 105. An outward-facing flange portion 108d is formed at the upper end of the first cover member 108. When the opening 22a of the pipe body 22 is closed with the first cover member 108, the flange portion 108d covers the upper peripheral surface of the opening 22a of the pipe body 22.

[0078] When rainwater flows along the waterproof sheet 15 and reaches the roof drain 5, it passes through the perforations 11a and flows into the horizontal pipe 6, and then flows into the main pipe section 22 via the horizontal pipe connection section 23 of the pipe fitting 105. The rainwater that has flowed into the main pipe section 22 hits the water flow guide slope 109, changes its direction of flow downward, passes through the narrowed diameter section 106, and is discharged to the drainage facility side such as a drainage manhole via the vertical pipe 7.

[0079] When the amount of rainwater flowing into the main body of the pipe 22 increases, the rainwater comes into contact with the water flow guide slope 109. The direction of rainwater flow is smoothly changed from horizontal to downward. As a result, even if a large amount of rainwater flows into the pipe fitting 105, there is less risk of turbulence or reverse flow caused by turbulence occurring inside the main body of the pipe 22, and good drainage capacity can be obtained. Furthermore, since multiple flow straightening plates 107 are provided from the bottom of the pipe body 22 to the reduced diameter section 106, the flow of rainwater from the bottom of the pipe body 22 to the reduced diameter section 106 can be straightened. As a result, rainwater can be smoothly discharged from the pipe fitting 105 to the vertical pipe 7.

[0080] As described above, the pipe fitting 105 of this embodiment can improve the inflow and drainage of rainwater into the vertical pipe 7. Furthermore, the inner diameter of the vertical pipe connection 24 is smaller than the inner diameter of the horizontal pipe connection 23. For example, even if the horizontal pipe 6 is made larger in diameter to cope with torrential downpours, the inner diameter of the vertical pipe connection 24 is smaller than the inner diameter of the horizontal pipe connection 23, so a vertical pipe 7 with a smaller inner diameter can be connected. Even if the horizontal pipe 6 becomes larger in diameter and the amount of rainwater flowing from the horizontal pipe 6 to the vertical pipe 7 increases, gravity acts on the rainwater flowing through the vertical pipe 7, causing it to be discharged faster than the rainwater flowing through the horizontal pipe 6, so there is no problem with drainage capacity. By increasing the diameter of the horizontal pipe 6 to counter torrential downpours, the vertical pipe 7 can be made smaller in diameter, eliminating the need to increase the strength of the fittings supporting the vertical pipe 7. Furthermore, the number of support fittings required can also be reduced. In addition, reducing the diameter of the vertical pipe 7 reduces the load on the building structure. Moreover, since the use of large-diameter vertical pipes 7 is eliminated, the storage space for large-diameter vertical pipes 7 can be reduced, contributing to the miniaturization of transport heavy machinery and providing a structure that does not place a burden on the design and construction of building 1A.

[0081] The pipe fitting 105 is equipped with a water flow guide slope 109. Rainwater flowing from the horizontal pipe 6 into the inside of the pipe body 22 is smoothly redirected when it hits the water flow guide slope 109, allowing it to be introduced smoothly into the vertical pipe 7. This makes the flow of rainwater inside the pipe body 22 smoother. The pipe fitting 105 is equipped with a diameter-reducing section 106. Therefore, rainwater flowing from the main pipe section 22 toward the vertical pipe 7 can be smoothly introduced by the diameter-reducing section 106.

[0082] Figure 30 is a schematic explanatory diagram illustrating the positional relationship between the central axis 22b of the pipe body 22 and the central axis 24a of the vertical pipe connection portion 24 in the pipe fitting 105 according to the third embodiment. In the pipe fitting 105, the central axis 22b and the central axis 24a are configured to overlap at the same position. Figure 31 is a schematic explanatory diagram illustrating the positional relationship between the central axis 22b of the pipe body 22 and the central axis 24a of the vertical pipe connection 24 in the pipe fitting 115 of the first modified example of the third embodiment. In the pipe fitting 115, the vertical pipe connection portion 24 is located below the reduced diameter portion 106, which is the same structure as the pipe fitting 105. However, the vertical pipe connection portion 24 is formed in an eccentric position to the right, as shown in Figure 31. In the pipe fitting 115, the central axis 22b and the central axis 24a are spaced apart to the left and right in Figure 31. That is, the vertical pipe connection portion 24 is installed further away from the outer wall 8 than the vertical pipe connection portion 24 of the pipe fitting 105. Therefore, with the pipe fitting 115, the vertical pipe 7 can be positioned slightly further away from the outer wall 8 compared to the pipe fitting 105.

[0083] Figure 32 is a schematic explanatory diagram illustrating the positional relationship between the central axis 22b of the pipe body 22 and the central axis 24a of the vertical pipe connection 24 in the pipe fitting 120 of the second modified example of the third embodiment. In the pipe fitting 120, the vertical pipe connection 24 is located below the reduced diameter portion 106, which is the same as in the pipe fitting 105, but it differs in that the vertical pipe connection 24 is formed in an eccentric position to the left, as shown in Figure 32. In the pipe fitting 120, the central axis 22b and the central axis 24a are spaced apart to the left and right in Figure 32. That is, the vertical pipe connection portion 24 is formed closer to the outer wall 8 than the pipe fitting 105. Therefore, in the pipe fitting 120, the vertical pipe 7 can be positioned closer to the outer wall 8 than the pipe fitting 105. As described above, in the pipe fittings 115 and 120, the vertical pipe connection portion 24 is eccentrically positioned relative to the pipe body portion 22.

[0084] Being able to position the vertical pipe 7 close to the exterior wall 8 means that the strength of the brackets supporting the vertical pipe 7 can be reduced, thus simplifying the installation of the vertical pipe 7 and reducing equipment costs. If the vertical pipe connection section 24 is eccentrically positioned relative to the main pipe section 22, the vertical pipe 7 can be installed in a position closer to or further away from the outer wall 8 located near the pipe fittings 115 and 120, for example. If the vertical pipe 7 can be positioned closer to the outer wall 8, the wind pressure acting on the vertical pipe 7 can be reduced, thereby reducing the load on the support structure of the vertical pipe 7 due to wind pressure.

[0085] In the above embodiment, multiple flow straightening plates 107 were provided protruding from the circumference of the reduced diameter portion 106 at predetermined intervals, but the installation position of the flow straightening plates 107 is not limited to this. For example, one or more flow straightening plates may be provided on the first lid member 108. The water flow guiding slope 109 of the first lid member 108 may be made into multiple plate shapes to serve as flow straightening plates. The flow straightening plates may also be provided so as to protrude from the water flow guiding slope 109 of the first lid member 108. In this case, it is preferable to arrange the rectifier plate parallel to the plane passing through the pipe axis of the horizontal pipe connection portion 23 and the vertical pipe connection portion 24. Furthermore, if it does not interfere with the reduced diameter portion 106, it may also be formed on the lower inner surface of the pipe body portion 22 below the lower end 108c of the extended portion 108a. In addition, rectifier plates may be provided on both the first lid member 108 and the reduced diameter portion 106.

[0086] Furthermore, in the above embodiment, an opening 22a is formed at the upper end of the pipe body portion 22 in the pipe fitting 105, and a first cover member 108 is provided that is detachably fitted to this opening 22a. However, an opening may be provided on the side surface of the pipe body portion 22, and a first cover member may be provided that is detachably fitted to the opening on the side surface.

[0087] Furthermore, the diameter-reducing portion 106 provided below the main pipe body 22 may be molded integrally with the main pipe body 22, or it may be formed as a separate component. When the main pipe body 22 and the diameter-reducing portion 106 are separate components, there are fewer constraints on the mold design during injection molding, and the degree of freedom in the shape of the rectifier plate provided integrally with the diameter-reducing portion 106 can be increased. Furthermore, if the rectifier plate is molded as a separate component, it is not necessary to provide the first cover member on the pipe body 22. The rectifier plate can be placed inside the pipe body 22 or the reduced diameter section 106 before fitting the pipe body 22 and the reduced diameter section 106 together.

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

[0089] The pipe fitting 125 is equipped with a flow straightening plate 108e, which facilitates the flow of rainwater from the horizontal pipe connection 23 to the vertical pipe connection 24. When multiple flow straightening plates 108e protrude inward from the pipe body 22, the flow of rainwater flowing from the pipe body 22 to the vertical pipe connection 24 can be smoothed by the flow straightening plates 108e.

[0090] Figure 35 shows a pipe fitting 130 of the third embodiment, which has a siphon activation member 131 inside. The pipe fitting 130 has a siphon activation member 131 at the inner bottom of the pipe body 22. The siphon activating member 131 has a mounting portion 132, a plurality (for example, four) of rectifying pieces 133, and a water drain plate 134. The mounting portion 132 is a low-profile cylindrical shape. Multiple flow straightening pieces 133 extend inward and diagonally upward from four locations on the inner circumference of the mounting portion 132. The drain plate 134 is disc-shaped. The drain plate 134 is integrally connected to the upper ends of the multiple flow straightening pieces 133.

[0091] The rectifier pieces 133 extend inward from the inner circumference of the mounting portion 132 at 90° intervals. Each rectifier piece 133 extends diagonally upward from the inner circumference of the mounting portion 132 toward the central axis of the mounting portion 132. At the portion where the upper end of each rectifier piece 133 joins the drain plate 134, an inclined portion 136 is formed that connects to the circumferential surface of the drain plate 134. The inclined portion 136 joins to the circumferential surface of the drain plate 134 while being inclined.

[0092] The mounting portion 132 is fixed to the inner circumferential surface of the main pipe portion 22 by means of an adhesive or other mounting method. The four flow straightening pieces 133 extending upward from the mounting portion 132 are positioned to face the connection point with the horizontal pipe 6 on the circumferential surface of the main pipe portion 22. Furthermore, the drain plate 134 is positioned perpendicular to the central axis of the main pipe section 22 (horizontally). The drain plate 134 is installed at a height approximately half the height of the section where the horizontal pipe 6 is connected to the main pipe section 22.

[0093] The opening between the drain plate 134 and the mounting portion 132 is designated as the drainage inlet F1. The size, height, and shape of each part of the siphon activating member 131 are adjusted so that the area of ​​the inlet opening F1 is larger than the upper opening area of ​​the mounting part 132 (the opening area of ​​the drop-off part).

[0094] The diameter of the drain plate 134 is approximately half the inner diameter of the pipe body 22. Since the drain plate 134 is installed above the mounting portion 132, the wastewater that flows into the pipe body 22 passes around the drain plate 134, reaches the narrowed diameter portion 106, and is discharged to the vertical pipe 7 side. Furthermore, as the amount of wastewater increases and reaches a position higher than the drain plate 134 inside the main body of the pipe 22, a siphon effect occurs as the wastewater passes through the siphon activating member 131. In other words, wastewater can be efficiently drained while filling the inside of the vertical pipe 7 with wastewater without trapping air bubbles or other debris on the vertical pipe 7 side below the siphon activating member 131. Therefore, a large amount of wastewater can flow through the vertical pipe 7. Consequently, even if a large amount of wastewater flows from the horizontal pipe 6 with a larger inner diameter to the vertical pipe 7 with a smaller inner diameter, good drainage can be ensured using the vertical pipe 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 2m or less, it will not affect the occurrence of the siphon effect and there will be no problem. Furthermore, a length of 1.0m or less is even more preferable.

[0095] (Fourth embodiment) Next, a fourth embodiment of the present invention will be described with reference to Figures 36 to 41. The same reference numerals are used for parts identical to those in the previous embodiments, and their descriptions will be omitted. Only the differences will be described. As shown in Figure 36, in the drainage piping system S4 of this embodiment, the first connecting member 26 and the second connecting member 27 of the drainage piping system S1 of the first embodiment are integrated. The drainage piping system S4 includes a pipe fitting 140 in place of the pipe fitting 3 of the drainage piping system S1. The pipe fitting 140 includes a reducing socket 141 and a siphon activating member 146 in place of the first connecting member 26, the second connecting member 27, and the siphon activating member 28 of the pipe fitting 3.

[0096] As shown in Figures 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 each other. 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 positioned below the large diameter portion 142. In the connecting portion 144, the outer diameter gradually decreases as it extends downwards. The connecting portion 144 is positioned between the large-diameter portion 142 and the small-diameter portion 143. The upper end of the connecting portion 144 is connected to the lower end of the large-diameter portion 142. The lower end of the connecting portion 144 is connected to the upper end of the small-diameter portion 143. As shown in Figure 36, the large-diameter section 142 is located within the vertical pipe connection section 24 and connected to the vertical pipe connection section 24. The upper end of the vertical pipe 7 is located within the small-diameter section 143 and connected to the small-diameter section 143. The reducing socket 141, configured as described above, functions as a diameter reduction section. The reducing socket 141 is separate from the pipe body 22.

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

[0098] The siphon activation member 146, configured as described above, is assembled to the reducing socket 141 from above. Specifically, the connecting cylinder portion 149 is positioned within the small diameter portion 143, and the flange portion 148 is positioned on the connecting portion 144. As shown in Figure 36, when the reducing socket 141 is connected to the vertical pipe connection portion 24 of the pipe fitting 140, a radial gap is formed between the pipe body portion 22 and the cover member 147. Furthermore, when a large amount of rainwater flows in through the inlet opening F2 during heavy rain, the siphon activating member 146 seals the vertical pipe 7 with water without drawing in air, keeping it full of water. As a result, the siphon effect is generated downstream of the siphon activating member 146, allowing for efficient drainage while filling the inside of the vertical pipe 7 with wastewater.

[0099] As described above, the pipe fitting 140 of this embodiment can improve the inflow and drainage of rainwater into the vertical pipe 7.

[0100] Figure 39 shows a drainage piping system S4a of a first modified example of the fourth embodiment according to the present invention. As shown in Figures 39 and 40, the pipe fitting 155 of the drainage piping system S4a includes a bottom plate 156, a vertical pipe connection 157, and a siphon activation member 158, in place of the vertical pipe connection 24 and siphon activation member 146 of the pipe fitting 140 of the fourth embodiment. As shown in Figures 40 and 41, the bottom plate 156 is annular. The bottom plate 156 is formed radially inward at the lower end of the pipe body portion 22. The vertical pipe connection portion 157 is cylindrical. The vertical pipe connection portion 157 extends downward from the inner circumference of the bottom plate 156. That is, the outer diameter of the vertical pipe connection portion 157 is smaller than the outer diameter of the main pipe portion 22.

[0101] The siphon activating member 158 includes a drain plate 161 and a pair of support legs 162. The drain plate 161 is disc-shaped and positioned along a horizontal plane. The drain plate 161 is positioned within the pipe body 22, spaced apart from the pipe body 22. The drain plate 161 is positioned at the same vertical location as the vertical intermediate portion of the horizontal pipe connection 23. Each support leg 162 is flat. Each support leg 162 is positioned along the central axis and vertical direction of the horizontal pipe connection 23. A pair of support legs 162 are spaced apart from each other in directions perpendicular to the central axis and vertical direction of the horizontal pipe connection 23. The upper ends of each pair of support legs 162 are joined to the drain plate 161. The lower ends of each pair of support legs 162 are joined to the vertical pipe connection 157. In other words, the siphon activating member 158 is integral with the pipe body 22. The pipe fitting 155, configured as described above, is integrally formed, for example, by injection molding.

[0102] As shown in Figure 39, the vertical pipe connection portion 157 of the pipe fitting 155 is connected to the upper end of the vertical pipe 7 via the socket 163.

[0103] In the pipe fitting 155 configured as described above, the siphon activation member 158 generates a siphon phenomenon, allowing for efficient drainage while filling the inside of the vertical pipe 7 with wastewater. Furthermore, when rainwater flows from the horizontal pipe 6 into the main pipe section 22, the drainage plate 161 and the pair of support legs 162 can prevent obstruction to the rainwater flowing in from the horizontal pipe 6.

[0104] Although the first to fourth embodiments of the present invention have been described in detail above with reference to the drawings, the specific configurations are not limited to these embodiments, and modifications, combinations, deletions, etc., of the configurations are also included without departing from the spirit of the present invention. Furthermore, it goes without saying that each of the configurations shown in each embodiment can be used in appropriate combinations. For example, in the first to fourth embodiments described above, the pipe body may be an elbow pipe using, for example, an arc-shaped bent pipe with a central angle of 90°. In this case, the pipe fitting comprises a horizontal pipe connection part and a vertical pipe connection part. Although the rectifying member is defined as a siphon activating member, the rectifying member is not particularly limited as long as it has the function of regulating the flow of wastewater.

[0105] "Verification test of drainage capacity" The following three types of verification tests were conducted to assess the effectiveness of the pipe fitting 45 shown in Figure 8 when actually performing drainage. In the verification test, a three-story building 1B shown in Figure 42 was used, and a gutter simulation 175 with a width of 30 cm, a depth of 35 cm, and a length of 8 m was installed on the third floor 173. A V-shaped horizontal pipe (horizontal pipe: nominal diameter 150A) 176, shown in Figure 43, was connected to one end wall 175a of the gutter simulation 175, and the horizontal pipe connection part 23 of the pipe fitting 45 was connected to the tip of this horizontal pipe 176. A vertical pipe (nominal diameter 75A) 178, with a height of approximately 6 m reaching from the third floor 173 to the first floor 171 of building 1B, was connected to the vertical pipe connection part 24 of the pipe fitting 45. A vertical pipe 178 was connected to a rainwater drain 179 installed on floor 171 of the first floor via a connecting pipe 180. This rainwater drain 179 was then connected to a drain pit 182 via a horizontal pipe 181 installed on floor 171 of the first floor. In addition, in the gutter model 175, the roof drain 5 was placed inside the end wall 175a to which the horizontal pipe 176 was connected.

[0106] The first verification test was conducted using the verification test apparatus described above to verify the drainage performance when a predetermined amount of water was flowed through the gutter simulator 175. The verification test was performed by flowing a predetermined amount of tap water (5 L / s, 10 L / s, 15 L / s, 20 L / s) through the gutter, discharging the tap water from a 30 cm long horizontal pipe 176 through a pipe fitting 45 to a vertical pipe 178, and measuring the water level (indicated as the lower water level) at a position 50 cm away from the end wall 175a of the gutter simulator 175. The results of the first verification test are shown in Figure 45.

[0107] In the second verification test, the horizontal pipe 176 installed on the end wall 175a of the gutter model 175 was removed from the verification test apparatus described earlier. Instead, as shown in Figure 44, an L-shaped horizontal pipe (horizontal pipe: nominal diameter 150A) 185 was connected to the side wall 175b of the gutter model 175, 45 cm away from the end wall 175a. The horizontal pipe connection part 23 of the pipe fitting 45 was connected to the tip of this horizontal pipe 185. The length of the horizontal pipe 185 along the longitudinal direction of the gutter model 175 was set to 1 m. Furthermore, in the gutter mock-up 175, the roof drain 5 was placed inside the side wall 175b to which the horizontal pipe 185 was connected. The second verification test involved flowing a predetermined amount of tap water (5 L / s, 10 L / s, 15 L / s, 20 L / s) through the gutter, draining it through a 1 m long horizontal pipe 185 and a pipe fitting 45 into a vertical pipe 178, and measuring the water level (referred to as the lower water level) at a position 50 cm away from the end wall 175a of the gutter model 175. The results of the second verification test are shown in Figure 45.

[0108] The third verification test was conducted using the same verification apparatus as the first verification test, but with a 90° Y-pipe used as the fitting instead of pipe fitting 45, and a vertical pipe of nominal diameter 150A connected to a horizontal pipe of nominal diameter 150A, and the same verification test as the first verification test was performed. 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) (5 L / s, 10 L / s, 15 L / s, 20 L / s) flowing through the gutter simulation 175, and the vertical axis shows the water level below the surface (0 to 300 mm). As shown in the graph in Figure 45, in all verification tests, as the amount of water flowing into the gutter simulated body 175 increases, the water level at the bottom gradually rises. In the graph shown in Figure 45, a lower water level value indicates superior drainage when comparing the same amount of water.

[0110] The results of the third verification test correspond to the conventional example. In contrast, the results of the first and second verification tests correspond to test examples in which the present invention is equipped with a siphon activating member. Comparing the results of the first verification test using horizontal pipe 176 with the results of the second verification test using horizontal pipe 185, good drainage performance was observed in both verification tests, although there was a slight difference in water level, regardless of whether the length of the horizontal pipe was 0.3m or 1.0m. This indicates that the length of the horizontal pipe, whether 1.0m or 0.3m, does not hinder the occurrence of the siphon effect. In the third verification test, which corresponds to a conventional example, a vertical pipe with a nominal diameter of 150A was used, which is twice the diameter of the 75A vertical pipe used in the first and second verification tests. It was found that even when using a vertical pipe with a nominal diameter of 75A, which is half the diameter of the conventional structure, the present invention's structure exhibits superior drainage performance. This is thought to be the result of the siphon activation member 28 installed inside the pipe fitting utilizing the siphon phenomenon to facilitate drainage. [Explanation of symbols]

[0111] 1A Building 2. Wainscoting 3, 45, 50, 55, 60, 65, 70, 75, 80, 85, 90, 95, 100, 105, 115, 120, 125, 130, 140, 155 Pipe 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 section 23a,24a Center axis line 24,157 Vertical pipe connection 25 Second vertical pipe connection 28, 42, 131, 146, 158 Siphon starting component (flow straightening component) 36. Second vertical pipe 37. Second lid member 46,108 First lid member 106 Reduced diameter part 108e rectifier plate 109 Slope for guiding water flow 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 part connected to the first pipe on the upstream side, The second connection part is connected to the second pipe on the downstream side, A flow straightening section is disposed between the first connection section and the second connection section, It has, The rectifier section has a rectifier plate, The rectifier plates are arranged in a plurality at intervals radially around the pipe axis of the second connection section, and are provided so as to protrude toward the pipe axis. The pipe body having the first connection portion and the second connection portion, and the rectifier plate are separate components. Pipe fittings.

2. The amount of protrusion of the rectifier plate changes in the direction of the pipe axis. A pipe fitting according to claim 1.

3. The rectifier plate is provided so as to extend along the pipe axis. A pipe fitting according to claim 1 or 2.

4. The pipe body and the rectifier plate are separate components formed by injection molding. A piping fitting according to any one of claims 1 to 3.

5. A piping joint according to any one of claims 1 to 4, The first tube and, The aforementioned second tube, A drainage piping system equipped with the following features.

6. A building comprising the drainage piping system described in claim 5.

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