JP7765229B2 - Stormwater pipe fittings, stormwater drainage piping systems, and buildings - Google Patents

Description

The present invention relates to a pipe fitting and a drainage piping system equipped with the pipe fitting.

In recent years, with the increasing frequency of heavy rainfall, there has been a trend toward larger rainwater pipes in order to improve the efficiency of draining rainwater from buildings.
For example, in the drainage piping system for the rooftop floor of a building shown in Figure 22, a frame-type roof drain 102 is installed along the corner of the rooftop floor 100 of the building where a spandrel wall 101 is erected. A horizontal pipe 103 connected to this roof drain 102 is installed so as to penetrate horizontally through the spandrel wall 101, and a drainage standpipe 106 is connected to the outer end of the horizontal pipe 103 via an elbow pipe 105 (see, for example, Non-Patent Document 1).

In a drainage piping system for the rooftop of a building, as shown in Figure 23, a drainage piping system is known in which a tee joint 107 is provided at the connection between a horizontal pipe 103 and a vertical pipe 106 instead of an elbow pipe 105. A removable cover plate 108 is provided on the ceiling of the tee joint 107.
Alternatively, as shown in Figure 24, a drainage piping system is known in which a drainage manhole 109 is provided at the connection between a horizontal pipe 103 and a vertical pipe 106 instead of an elbow pipe 105. A removable cover plate 110 is provided on the ceiling of the drainage manhole 109.

Kaneso Co., Ltd. "Product Information: Cast Iron Roof Drain, Waterproofing Layer Width 100mm, Horizontal Pull, Drive-in Type," [online], [Retrieved September 17, 2021], Internet (URL http://www.kaneso.co.jp/seihin/WHXA.htm)

In the drainage piping system shown in FIG. 22, rainwater on the roof is introduced into a horizontal pipe 103 via a roof drain 102, and is drained by flowing into a vertical pipe 106 via an elbow pipe 105.
In a typical drainage piping system, the horizontal pipe 103 and the vertical pipe 106 are designed to have the same diameter, but in consideration of countermeasures against recent sudden heavy rains, there is a trend to increase the diameter of both the horizontal pipe 103 and the vertical pipe 106 in order to improve drainage capacity.

However, increasing the diameter of standpipes to protect against heavy rainfall increases the weight of the pipes in buildings with many floors, posing the problem of requiring a stronger support structure to withstand the weight of the pipes and to withstand wind forces. Furthermore, there are likely to be a variety of other impacts, such as an increase in the number of support points for the pipes using support fittings, the need for stronger support fittings, and in some cases a need to reconsider the strength of the building structure. Additionally, there are concerns that this could have a variety of impacts on the design and construction of buildings, such as the need to secure storage space for large-diameter standpipes, the need for larger heavy transport equipment, and the need for more labor.

The present invention was made in consideration of the above-mentioned circumstances, and aims to provide a piping joint that improves the inflow and drainage of rainwater into the standpipe, thereby enabling the diameter of the standpipe to be increased without having to be increased even when the diameter of the horizontal pipe is increased, and a drainage piping system equipped with the piping joint.

In order to solve the above problems, the present invention proposes the following aspects.
"1" The piping joint of this embodiment is a piping joint provided at the connection between a horizontal pipe and a vertical pipe, and has a pipe main body portion arranged with its central axis facing up and down, a horizontal pipe connection portion formed on the side of the pipe main body portion and connected to the horizontal pipe, and a vertical pipe connection portion formed on the lower part of the pipe main body portion and to which the vertical pipe is connected, and is configured so that the inner diameter of the vertical pipe connection portion is smaller than the inner diameter of the horizontal pipe connection portion.

Even if the diameter of the horizontal pipe is increased to deal with sudden heavy rain, the inner diameter of the standpipe connection is smaller than that of the horizontal pipe connection, so a standpipe with a smaller inner diameter can be connected. Even if the diameter of the horizontal pipe is increased and the amount of rainwater flowing from the horizontal pipe into the standpipe increases, gravity acts on the rainwater flowing in the standpipe, so the rainwater is discharged faster than the rainwater flowing in the horizontal pipe, so there is no problem with drainage capacity.
Even if the diameter of the horizontal pipes is increased to counteract sudden heavy rain, the diameter of the vertical pipes can be reduced, which eliminates the need to increase the strength of the metal fittings that support the vertical pipes and reduces the number of supporting metal fittings required. Furthermore, by reducing the diameter of the vertical pipes, the load on the building structure can be reduced. Furthermore, since large diameter vertical pipes are no longer required, the storage space for large diameter vertical pipes can be reduced, contributing to the miniaturization of heavy transport equipment, and a structure can be provided that does not impose a burden on the design and construction of buildings.

"2" In the piping fitting of this embodiment, an opening may be formed at the top of the pipe main body, and a lid member that can open and close the opening may be removably attached.

If the opening of the pipe body can be opened and closed freely with a cover member, the cover member can be removed to clean the inside of the pipe fitting if foreign matter accumulates inside the pipe body or becomes clogged with foreign matter, providing a pipe fitting with excellent maintainability.

"3" In this embodiment, a configuration can be adopted in which a water flow guide slope is formed on the lower part of the lid member, which slopes relative to both the central axis of the horizontal pipe connection part and the central axis of the vertical pipe connection part.

By providing a water flow guide slope on the inside of the main pipe section, the flow of rainwater that flows into the main pipe section from the horizontal pipe can be smoothly redirected and introduced into the vertical pipe section. This allows for smoother flow of rainwater inside the main pipe section.

"4" In this embodiment, a configuration can be adopted in which the cover member is provided with one or more flow straightening plates that protrude toward the inside of the tube main body.

By providing a straightening plate on the cover member that protrudes inside the main pipe body, the flow of rainwater from the main pipe body to the standpipe connection can be smoothed.

"5" In this embodiment, it is preferable that the standpipe connection portion is formed via a reduced diameter portion at the lower part of the pipe main body portion.

By providing a standpipe connection section via a reduced diameter section below the main pipe section, rainwater flowing from the main pipe section toward the standpipe can be smoothly guided.

"6" In this embodiment, it is preferable that one or more straightening plates protrude from the inner surface of the tube main body.

By installing a straightening plate inside the main pipe body, the flow of rainwater from the main pipe body to the vertical pipe connection can be smoothed.

"7" In this embodiment, a configuration can be adopted in which the standpipe connection portion is eccentrically positioned relative to the pipe main body portion.

If the standpipe connection is connected eccentrically to the main pipe body, the standpipe can be installed closer to or further away from the exterior wall located near the piping joint. If the standpipe can be installed closer to the exterior wall, the wind pressure acting on the standpipe can be reduced, thereby reducing the strain on the standpipe's support structure.

"8" In this embodiment, a configuration can be adopted in which a second standpipe connection portion is formed on the upper part of the pipe main body portion and to which a second standpipe is connected.

By including the second upright pipe connection section, the piping joint (pipe body section) becomes a tee joint with a known configuration, reducing the cost required for installing the piping joint.

"9" In this embodiment, a configuration in which a siphon activation member is provided inside can be adopted.

By providing an internal siphon activation member, a configuration can be provided that allows for smooth drainage of large amounts of wastewater from the piping joint to the standpipe, even if a large amount of wastewater flows into the piping joint from the horizontal pipe. Even if the inner diameter of the standpipe is smaller than the inner diameter of the horizontal pipe, the siphon effect can be used to achieve high drainage performance in the standpipe.

"10" The drainage piping system of this embodiment comprises a roof drain installed on the roof floor of a building, a horizontal pipe connected to the roof drain and passing through the waist wall of the roof floor of the building, a piping joint connected to the outer end of the horizontal pipe, and a vertical pipe connected to the lower part of the piping joint, wherein the piping joint is any one of the piping joints described above.

In the drainage piping system of this embodiment, even if the horizontal pipe is made larger in diameter to deal with sudden heavy rain, a piping joint with a smaller inner diameter than the horizontal pipe connection is used, so a standpipe with a smaller inner diameter can be connected. Even if the horizontal pipe is made larger in diameter and the amount of rainwater flowing from the horizontal pipe into the standpipe increases, gravity acts on the rainwater flowing in the standpipe, so the rainwater is discharged faster than the rainwater flowing in the horizontal pipe, so there is no problem with drainage capacity.
To provide a drainage piping system that eliminates the need to increase the strength of metal fittings supporting the vertical pipe more than necessary and reduces the number of supporting metal fittings required, by making it possible to reduce the diameter of the vertical pipe while increasing the diameter of the horizontal pipe to deal with sudden heavy rain.
Furthermore, by reducing the diameter of the standpipe, the load on the building frame to which the drainage piping system is applied can be reduced. In addition, there is no need to use a large diameter standpipe, which reduces the storage space required for large diameter standpipes, contributes to the downsizing of heavy transport equipment, and provides a drainage piping system that does not impose a load on the design and construction of the building.

The piping joint of the present invention can be applied to a structure in which the inner diameter of the standpipe connection is smaller than the inner diameter of the horizontal pipe connection, even if the horizontal pipe is enlarged to protect against sudden heavy rain, providing a joint that allows the standpipe diameter to be reduced.

FIG. 1 is a partial cross-sectional view showing an example of a drainage piping system in which a piping joint according to the first embodiment of the present invention is applied to a connection between a horizontal pipe installed on the rooftop floor of a building and a vertical pipe arranged along an exterior wall. FIG. FIG. 2 is a perspective view showing a cross section of a main part of the piping joint. FIG. 2 is a cross-sectional view showing the internal structure of the piping joint. FIG. 5 is a cross-sectional view taken along line AA shown in FIG. 4. 3 is an explanatory diagram showing the positional relationship of a standpipe connecting portion with respect to a pipe main body portion in the piping joint according to the first embodiment. FIG. 10 is a structural diagram showing a piping joint according to a second embodiment of the present invention, in which the positional relationship of the standpipe connecting portion relative to the pipe main body portion is changed. FIG. 10 is a structural diagram showing a piping joint according to a third embodiment of the present invention, in which the positional relationship of the standpipe connecting portion relative to the pipe main body portion is changed. FIG. 10A and 10B show a piping joint according to a fourth embodiment of the present invention, in which FIG. 10A is a partial cross-sectional view and FIG. FIG. 10 is a transparent perspective view showing a piping joint according to a fifth embodiment of the present invention. FIG. 10 is a cross-sectional view showing an example of a drainage piping system using a piping joint according to a sixth embodiment of the present invention. FIG. 10 is an exploded perspective view of a reducing socket and a siphon activation member used in the piping joint. FIG. FIG. 10 is a perspective view of the reducing socket and the siphon activation member in an assembled state. FIG. 13 is a cross-sectional view showing an example of a drainage piping system using a piping joint according to a seventh embodiment of the present invention. FIG. 2 is a partially cutaway perspective view of the piping joint. 17 is a cross-sectional view taken along line A2-A2 shown in FIG. 16. FIG. 1 is a perspective view showing an outline of a verification test device used to verify the influence of the length of the horizontal pipe. FIG. 1 is an explanatory diagram showing the configuration of a verification test device equipped with a horizontal pipe having a length of 0.3 m. FIG. 1 is an explanatory diagram showing the configuration of a verification test device equipped with a horizontal pipe having a length of 1.0 m. 21 is a graph showing test results obtained by the verification test device shown in FIGS. 19 and 20. FIG. 1 is a configuration diagram showing a first conventional example of a drainage piping system. FIG. 10 is a configuration diagram showing a second conventional example of a drainage piping system. FIG. 10 is a configuration diagram showing a third conventional example of a drainage piping system.

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

The roof drain 5 has an L-shaped frame 12 consisting of a bottom plate 10 and a side plate 11, and a tubular member 13 for connecting piping is integrated into the frame 12. The tubular member 13 extends outward from the side plate 11 through a through-hole 11a formed on the bottom side of the side plate 11.
The roof drain 5 is installed at the corner of the roof floor 1 by placing the bottom plate 10 at the corner of the roof floor 1, and by closely adhering the side plate 11 to the bottom of the waist wall 2, and by inserting a tubular member 13 into a through hole 2a formed at the bottom of the waist wall 2.
An L-shaped frame-shaped strainer 17 with multiple water passage holes is detachably attached to the inside of the frame 12 with bolts 18 and nuts 19, and the frame 12 and strainer 17 form the roof drain 5.

By attaching the strainer 17 to the frame 12 with bolts 18 and nuts 19, the end of the waterproof sheet 15 on the roof floor 1 side is sandwiched and held down between the bottom plate 10 of the roof drain 5 and the bottom of the strainer 17. Similarly, by using the bolts described above, the end of the waterproof sheet 16 on the waist wall 2 side is sandwiched and held down between the side plate 11 and the top of the strainer 17.
The roof drain 5 applied in this embodiment is just one example, and the structure of the roof drain applied to the present invention may be any roof drain of a general structure, such as a general frame type or box type, as appropriate.

A horizontal through-hole 2a is formed in the waist wall 2 at a position where it meets the roof floor 1. A horizontal drainage pipe 6 is arranged in this through-hole 2a with one end slightly protruding outside the through-hole 2a and the other end connected to the tubular member 13 of the roof drain 5.
The piping joint 3 connected to the horizontal pipe 6 has a pipe main body 22, a horizontal pipe connection portion 23, and a standpipe connection portion 25. The pipe main body 22 is installed close to the waist wall 2 with its central axis aligned vertically. The pipe main body 22 has a cylindrical shape, and a cylindrical horizontal pipe connection portion 23 protrudes sideways from part of its side surface 22a. When installing the pipe main body 22, it is acceptable to install it with its central axis slightly tilted from the vertical.

The horizontal pipe connecting portion 23 has an opening of a size that allows the outer end of the horizontal pipe 6 to be inserted, and the outer end of the horizontal pipe 6 is inserted into this opening and connected to the horizontal pipe connecting portion 23 by means of adhesive or the like. The inner diameter of the horizontal pipe connecting portion 23 is set to an inner diameter that allows the horizontal pipe 6 to be inserted as described above, and the inner diameter of the pipe main body 22 is also formed to be approximately the same as the inner diameter of the horizontal pipe connecting portion 23. The horizontal pipe connecting portion 23 is formed at a position slightly below the upper end of the pipe main body 22.
In the configuration shown in Figures 1 to 3, the height dimension of the pipe main body portion 22 is formed slightly larger than the outer diameter of the horizontal pipe connection portion 23, so that the uppermost end position of the horizontal pipe connection portion 23 is located slightly below the upper end of the pipe main body portion 22, and the lowermost end position of the horizontal pipe connection portion 23 is located near the bottom of the pipe main body portion 22.

The overall outline of the piping joint 3 is shown in FIG. 2, and the internal cross-sectional structure of the piping joint 3 is shown in FIG.
As shown in Figures 2 and 3, the piping joint 3 is installed with the central axis of the pipe main body 22 vertical, and a standpipe connection part 25 is formed below the pipe main body 22 via a tapered diameter part 26. The tapered diameter part 26 is formed in an inwardly tapering shape so that the diameter gradually narrows downward from the lower end of the pipe main body 22, and the standpipe connection part 25 is formed at the lower end of the tapered diameter part 26. The standpipe 7 is inserted into this standpipe connection part 25 and fixed by means of adhesive or the like. The standpipe connection part 25 is cylindrical and has an inner diameter that allows the upper end of the standpipe 7 to be inserted therein.

1 to 3, the inner diameter of the standpipe connecting portion 25 is set to about half the inner diameter of the pipe main body portion 22. In addition, the inner diameter of the standpipe connecting portion 25 is formed to be about half the inner diameter of the horizontal pipe 6, so the inner diameter of the standpipe 7 is formed to be about half the inner diameter of the horizontal pipe 6.
In this embodiment, the inner diameter of the standpipe 7 is set to about 1/2 of the inner diameter of the horizontal pipe 6, but the inner diameter of the standpipe 7 may be set to about 1/2 to 2/3 of the inner diameter of the horizontal pipe 6. That is, the inner diameter of the standpipe connecting portion 25 may be set to about 1/2 to 2/3 of the inner diameter of the pipe main body 22. In any case, in this embodiment, the inner diameter of the standpipe connecting portion 25 (≈ inner diameter of the standpipe 7) is set to be smaller than the inner diameter of the pipe main body 22 (≈ inner diameter of the horizontal pipe 6).

The piping fitting 3 is formed by injection molding resins such as olefin resins such as PE (polyethylene), PP (polypropylene), or PB (polybutene), rigid polyvinyl chloride resin, ABS (acrylonitrile-butadiene-styrene copolymer resin), and AES (acrylonitrile-ethylene-styrene copolymer resin).

In the piping fitting 3, an opening 22b is formed at the upper end of the pipe main body 22, and this opening 22b is closed by a detachable lid member 28. The lid member 28 is a cylindrical member that fits into the opening 22b, and its bottom side is formed with an extension 28a that closes the opening 22b and extends from the upper end of the pipe main body 22 to the bottom side of the pipe main body 22. This extension 28a is formed with a water flow guide slope 28b that is inclined with respect to both the central axis 23a of the horizontal pipe connection portion 23 and the central axis 25a of the vertical pipe connection portion 25 when the opening 22b is closed by the lid member 28. This slope 28b is inclined so that it forms a concave arc surface facing diagonally downward, as shown in Figure 3.

Since the extending portion 28a has a slope 28b, the thickness of the cover member 28 in the vertical direction is small on the horizontal pipe connecting portion 23 side of the cover member 28 and gradually becomes thicker on the opposite side. Therefore, the lower end 28c of the extending portion 28a extends to the lower side of the pipe main body 22, in other words, to a height position corresponding to the lowest end position of the horizontal pipe connecting portion 23.
The slope 28b of the cover member 28 is provided to smoothly change the flow direction of rainwater downward when the amount of rainwater flowing in from the horizontal pipe connection side increases, and to adjust the flow of rainwater to prevent turbulence from occurring inside the piping joint 3. The cover member 28 is fitted to the piping joint 3 so that it can be removed when it becomes necessary to clean the inside of the piping joint 3. An outward flange 28d is formed on the upper end of the cover member 28, and when the opening 22b of the pipe main body 22 is closed with the cover member 28, the flange 28d covers the upper peripheral surface of the opening of the pipe main body 22.

A plurality of flow straightening plates 30 are provided at predetermined intervals around the circumference of the pipe main body 22 and the reduced diameter portion 26, protruding from the lower end of the pipe main body 22 to the lower end of the reduced diameter portion 26. The flow straightening plates 30 are arranged to extend in the length direction (vertical direction) of the pipe main body 22 from the lower end of the pipe main body 22 to the lower end of the reduced diameter portion 26. Note that the flow straightening plates 30 may also be formed on the lower side of the pipe main body 22, as long as they do not interfere with the lower end 28c of the extending portion 28a.
In the structure of the first embodiment, six rectifying plates 30 are provided as shown in Figures 3 to 5. These rectifying plates 30 are formed so that the protrusion amount (width) is greater on the upper side and gradually decreases on the lower side. In this embodiment, six rectifying plates 30 are provided, but the number may be one or more. It is preferable to provide multiple rectifying plates 30 radially around the tube axis of the reduced diameter portion 26.

When rainwater flows along the waterproof sheet 15 and reaches the roof drain 5, it passes through the through-hole 11a and flows into the horizontal pipe 6, then flows into the pipe main body 22 via the horizontal pipe connection part 23 of the piping fitting 3. Once in the pipe main body 22, the rainwater changes direction and flows downward, passes through the reduced diameter part 26, and travels down the vertical pipe 7 before being discharged into a drainage facility such as a catch basin.

When the amount of rainwater flowing into the pipe main body 22 increases, the rainwater hits the downwardly facing concave slope 28b, and the flow direction of the rainwater changes smoothly from horizontal to downward. Therefore, even if a large amount of rainwater flows into the piping joint 3, there is little risk of turbulence or reverse flow due to turbulence occurring inside the pipe main body 22, and good drainage capacity can be obtained.
Furthermore, since a plurality of flow straightening plates 30 are provided from the bottom of the pipe main body 22 to the reduced diameter section 26, the flow of rainwater flowing from the bottom side of the pipe main body 22 to the reduced diameter section 26 can be straightened. This allows rainwater to be smoothly discharged from the piping joint 3 to the standpipe 7.

On the other hand, in recent years, there has been a trend toward increasing the diameter of horizontal pipes 6 to improve drainage capacity, due to measures such as those for dealing with sudden heavy rain. In the structure of this embodiment, the inner diameter of standpipe 7 is smaller than that of horizontal pipe 6. When rainwater flows into standpipe 7, gravity acts on the rainwater flowing through standpipe 7, so the rainwater flowing through standpipe 7 is discharged more smoothly than the rainwater flowing through horizontal pipe 6. Therefore, even if a large amount of rainwater flows into standpipe 7 through horizontal pipe 6, the rainwater flowing through standpipe 7 will have a faster flow rate, and sufficient drainage can be achieved by standpipe 7 even with a small inner diameter. As an example, if the outer diameter of horizontal pipe 6 is 150 mm, the outer diameter of standpipe 7 can be 75 mm. The outer diameter of standpipe 7 may also be 100 mm, for example.

In this embodiment, the standpipe 7 has a smaller diameter than the horizontal pipe 6, which reduces the weight of the standpipe 7 compared to conventional structures that use standpipes with the same outer diameter as the horizontal pipe 6. Because the weight of the standpipe 7 can be reduced, the number of metal fittings supporting the standpipe 7 can be reduced, and the strength of the supporting metal fittings can be reduced, reducing excessive load on the building structure. Furthermore, storage space required when installing the standpipe 7 can be reduced, and the need for heavy transport equipment can be suppressed, providing the advantage of greater flexibility in the design and construction of the building.

6 is an explanatory diagram schematically illustrating the positional relationship between the central axis a1 of the pipe main body 22 and the central axis a2 of the standpipe connecting portion 25 in the piping joint 3 according to the first embodiment. In the piping joint 3 of the first embodiment, the central axis a1 and the central axis a2 overlap at the same position.
FIG. 7 is an explanatory diagram that schematically illustrates the positional relationship between the central axis a1 of the pipe main body 22 and the central axis a2 of the standpipe connecting portion 25 in the piping joint 40 of the second embodiment.
The structure of the second embodiment is the same as that of the first embodiment in that the upright pipe connection portion 25 is provided below the reduced diameter portion 26, but differs in that the upright pipe connection portion 25 is formed in an eccentric position to the right as shown in Figure 7.
In the piping joint 40 of the second embodiment, the central axis a1 and the central axis a2 are spaced apart from each other in Fig. 7. That is, the standpipe connecting portion 25 is disposed at a position farther away from the outer wall 8 than in the structure of the first embodiment. Therefore, in the structure of the second embodiment, the standpipe 7 can be disposed at a position slightly farther away from the outer wall 8 than in the structure of the first embodiment.

8 is an explanatory diagram schematically illustrating the positional relationship between the central axis a1 of the pipe main body 22 and the central axis a2 of the standpipe connecting portion 25 in a piping joint 50 of the third embodiment. The structure of the third embodiment is the same as the structure of the first embodiment in that the standpipe connecting portion 25 is provided below the reduced diameter portion 26, but differs in that the standpipe connecting portion 25 is formed at a position eccentric to the left as shown in FIG.
In the piping joint 50 of the third embodiment, the central axis a1 and the central axis a2 are spaced apart from each other to the left and right in Fig. 8. That is, the standpipe connecting portion 25 is formed at a position closer to the outer wall 8 than in the structure of the first embodiment. Therefore, in the structure of the third embodiment, the standpipe 7 can be disposed at a position closer to the outer wall 8 than in the structure of the first embodiment.
The ability to arrange the standpipe 7 at a position close to the outer wall 8 means that the standpipe 7 can be supported even if the strength of the metal fittings supporting the standpipe 7 is reduced, which makes the installation work of the standpipe 7 easier and has the effect of reducing the equipment cost.

In the explanation so far, we have described an example in which this embodiment is applied to a roof drain 5 installed on the rooftop floor 1 of a building. However, roof drains 5 may also be installed on balcony floors, veranda floors, terrace floors, etc., and therefore the structure of the previous embodiment of this application can be applied to roof drains installed on balcony floors, veranda floors, terrace floors, etc.

In the above embodiment, a plurality of rectifying plates 30 are provided at predetermined intervals around the circumference of the reduced diameter portion 26, but the installation position of the rectifying plates 30 is not limited to this. For example, one or a plurality of rectifying plates may be provided on the cover member 28, or the sloping surface 28b of the cover member 28 may be formed into a plurality of plate-like plates to form the rectifying plates, or the rectifying plates may be provided so as to protrude from the sloping surface 28b of the cover member 28.
In this case, the current rectifier vane is preferably disposed parallel to a plane passing through the pipe axes of the horizontal pipe connection portion 23 and the vertical pipe connection portion 25. Furthermore, the current rectifier vane may also be formed on the lower inner surface of the pipe main body portion 22 below the lower end 28c of the extension portion 28a, provided that it does not interfere with the reduced diameter portion 26. Furthermore, the current rectifier vane may be provided on both the cover member 28 and the reduced diameter portion 26.

In addition, in the above embodiment, an opening 22b is formed at the upper end of the pipe main body 22 in the piping fitting 3, and a lid member 28 is provided that is removably fitted to this opening 22b. However, an opening may also be provided on the side of the pipe main body 22, and a lid member may be provided that is removably fitted to the opening on the side.

Furthermore, the reduced diameter section 26 provided below the pipe main body section 22 may be molded integrally with the pipe main body section 22, or may be formed as a separate member. When the pipe main body section 22 and the reduced diameter section 26 are separate members, there are fewer constraints on mold design during injection molding, and the degree of freedom in the shape of the rectifying plate provided integrally with the reduced diameter section 26 can be increased. Furthermore, when the rectifying plate is molded as a separate member, there is no need to provide a cover member on the pipe main body section 22, and the rectifying plate can be placed inside the pipe main body section 22 or the reduced diameter section 26 before the pipe main body section 22 and the reduced diameter section 26 are fitted together.

Figure 9 shows a fourth embodiment of a piping joint according to the present invention, in which a plurality of straightening plates 28e are provided on the cover member 28. This form of piping joint is provided with a plurality of straightening plates 28e that protrude from the inclined surface 28b of the cover member 28 toward the horizontal pipe connection portion 23 and the vertical pipe connection portion 25.
When viewed in cross section from the side in the direction shown in Fig. 9(a), the current rectifying vanes 28e are formed in a fan shape with a central angle of approximately 90°. The current rectifying vanes 28e are arranged at predetermined intervals parallel to the paper surface when viewed in cross section as shown in Fig. 9(a) (five vanes in the drawing), and are arranged at predetermined intervals in the left-right direction when viewed from the front as shown in Fig. 9(b). In either case, the current rectifying vanes 28e are arranged parallel to a plane passing through the pipe axes of the horizontal pipe connecting portion 23 and the vertical pipe connecting portion 25.
By providing the current plate 28e shown in FIG. 9, the flow of rainwater flowing from the horizontal pipe connection portion 23 to the vertical pipe connection portion 25 can be made smoother.

FIG. 10 shows a fifth embodiment of a piping joint having a siphon actuation member provided inside. In this embodiment, the piping joint 35 has a siphon actuation member 36 provided on the inner bottom of the pipe main body 22.
The siphon actuation member 36 has a short, cylindrical mounting portion 37 and four flow straightening pieces 38 that extend diagonally upward inward from four locations on the inner periphery of the mounting portion 37. A circular water drain plate 39 is provided and integrally connected to the upper ends of these four flow straightening pieces 38.

Four straightening pieces 38 of the siphon activation member 36 extend at 90° intervals around the inner periphery of the mounting portion 37, and each straightening piece 38 extends diagonally upward from the inner periphery of the mounting portion 37 toward the central axis of the mounting portion 37. Where the upper end of each straightening piece 38 joins the water drain plate 39, an inclined portion 41 is formed that connects to the circumferential surface of the water drain plate 39. The inclined portion 41 is joined at an angle relative to the circumferential surface of the water drain plate 39.

The mounting portion 37 of the siphon actuation member 36 is fixed to the inner peripheral surface of the pipe main body 22 by a mounting means such as adhesive.
Four straightening pieces 38 extending upward from the mounting portion 37 are arranged so as to face the connecting portion between the horizontal pipe 6 and the peripheral surface of the pipe main body 22. The water drain plate 39 is arranged in a direction perpendicular to the central axis of the pipe main body 22 (horizontally), and is installed at a position about half the height of the portion where the horizontal pipe 6 is connected to the pipe main body 22.

The opening between the drain plate 39 and the mounting portion 37 serves as an inflow opening F for drainage water.
The size, height, and shape of each part of the siphon activation member 36 are adjusted so that the area of the inlet opening F is larger than the opening area on the upper surface of the mounting portion 37 (the opening area of the drop port portion).

The diameter of the water drain plate 39 is formed to be approximately half the inner diameter of the pipe main body 22, and the water drain plate 39 is installed above the mounting part 37, so that the wastewater flowing into the pipe main body 22 passes around the water drain plate 39, reaches the reduced diameter part 26, and is discharged to the vertical pipe 7 side.
Furthermore, when the amount of drainage increases and the drainage reaches a position inside the pipe main body 22 higher than the water drain plate 39, a siphoning phenomenon occurs as the drainage passes through the siphon activation member 36. In other words, the inside of the standpipe 7 can be filled with drainage and drained efficiently without entraining air bubbles or the like on the side of the standpipe 7 below the siphon activation member 36.
Therefore, a large amount of wastewater can flow into the standpipe 7. Therefore, even if a large amount of wastewater flows from the horizontal pipe 6 having a large inner diameter into the standpipe 7 having a small inner diameter, good drainage performance can be ensured by using the standpipe 7.
The length of the horizontal pipe 6 does not need to be longer than necessary, but if it is, for example, 2 m or less, it will not affect the occurrence of the siphon phenomenon and will not cause any problems. Furthermore, the length of the horizontal pipe 6 is more preferably 1.0 m or less.

11 and 12 show a piping joint 70 according to a sixth embodiment. A pipe main body 71 of the piping joint 70 of this embodiment is a cheese-type joint having a known configuration.
The piping joint 70 has one horizontal pipe connection portion 23, a standpipe connection portion 25, and a second standpipe connection portion 72. The horizontal pipe connection portion 23 is formed on the side surface of the pipe main body portion 71. The standpipe connection portion 25 is formed on the lower portion of the pipe main body portion 71.
The second standpipe connecting portion 72 is configured to have a cylindrical shape, similar to the standpipe connecting portion 25. The second standpipe connecting portion 72 is formed on the upper part of the pipe main body portion 71.
11, the lower end of the second standpipe 7B is connected to this second standpipe connection portion 72. The drainage piping system S2 is configured to include the roof drain 5, the horizontal pipe 6, the piping joint 70, the standpipe 7, and the second standpipe 7B.
The second standpipe 7B has a configuration similar to the standpipe 7. The second standpipe 7B extends upward from the second standpipe connecting portion 72. For example, the second standpipe connecting portion 72 extends to the vicinity of the upper end portion of the waist wall 2. The piping joint 70 is plane-symmetrical with respect to a reference plane that includes the central axis of the horizontal pipe connecting portion 23 and is perpendicular to the central axes of the standpipe connecting portion 25 and the second standpipe connecting portion 72.

The riser pipe 7 is connected to the riser pipe connecting portion 25 of the piping joint 70 via a reducing socket 75. A siphon actuation member 80 is attached to this reducing socket 75.
13 and 14 , the reducing socket 75 has a large diameter portion 76, a small diameter portion 77, and a connecting portion 78. The large diameter portion 76, the small diameter portion 77, and the connecting portion 78 are each formed in a cylindrical shape and are arranged coaxially with one another. The outer diameter of the small diameter portion 77 is smaller than the outer diameter of the large diameter portion 76. The small diameter portion 77 is arranged below the large diameter portion 76.
The outer diameter of the connecting portion 78 gradually decreases downward. The connecting portion 78 is disposed between the large diameter portion 76 and the small diameter portion 77. The upper end of the connecting portion 78 is continuous with the lower end of the large diameter portion 76. The lower end of the connecting portion 78 is continuous with the upper end of the small diameter portion 77.
11 , the large diameter portion 76 is disposed within the standpipe connecting portion 25 and is connected to the standpipe connecting portion 25. The upper end portion of the standpipe 7 is disposed within the small diameter portion 77 and is connected to the small diameter portion 77.

As shown in FIGS. 13 and 14, the siphon actuation member 80 has a cover member 81 , a flange portion 82 , and a connecting tube portion 83 .
For example, the cover member 81 has a cylindrical shape with a top. An inlet opening 81a for draining water is formed on the side surface of the cover member 81.
The flange portion 82 and the connecting tube portion 83 are each formed in a cylindrical shape.
The flange portion 82 covers the lower end portion of the cover member 81 from the radial outside of the cover member 81. The cover member 81 is connected to the flange portion 82.
The connecting tube portion 83 is disposed below the flange portion 82. The connecting tube portion 83 is connected to the flange portion 82 via a connecting portion (not shown).
For example, reducing socket 75 and siphon activation member 80 are formed from the same material as pipe fitting 3 .

The siphon activation member 80 configured as described above is assembled to the reducing socket 75 from above. Specifically, the connecting tube portion 83 is disposed within the small diameter portion 77, and the flange portion 82 is disposed on the connecting portion 78. Then, as shown in Figure 11, when the reducing socket 75 is connected to the upright pipe connecting portion 25 of the piping joint 70, a radial gap is formed between the pipe main body 71 and the cover member 81.
When a large amount of rainwater flows in through the inlet opening 81a during heavy rain, the siphon activation member 80 seals the riser 7 while keeping it full without sucking in air. As a result, a siphon phenomenon occurs downstream (below) of the siphon activation member 80, filling the inside of the riser 7 with wastewater and allowing efficient drainage.

11, a lid member 86 is connected to the upper end of the second upright pipe 7B via a socket 85. That is, the upper end of the second upright pipe 7B is closed by the lid member 86.
The lid member 86 is a cap-shaped member. The lid member 86 includes a top plate 86a and a connecting tube 86b provided on one surface of the top plate 86a. It is desirable that an air vent hole be formed in the lid member 86. The connecting tube 86b is detachably fitted into the upper end of the socket 85. The lid member 86 contacts the upper end of the socket 85 from above this upper end.
A worker on the rooftop floor 1 of the building removes the cover member 86 from the socket 85 over the waist wall 2. Then, the inside of the second upright pipe 7B and the piping joint 70 can be cleaned.
By using the piping joint 70 (pipe main body 71), which is a joint with a known configuration, the cost required for installing the piping joint 70 can be reduced.

15 to 17 show a piping joint 90 according to a seventh embodiment. The piping joint 90 of this embodiment includes a bottom plate 91, a standpipe connecting portion 92, and a siphon activation member 93, instead of the standpipe connecting portion 25 of the piping joint 70 of the sixth embodiment.
The drainage piping system S3 is configured with the roof drain 5, the horizontal pipe 6, the piping joint 90, the vertical pipe 7, and the second vertical pipe 7B.
16 and 17, the bottom plate 91 has an annular shape and is formed on the inside in the radial direction of the lower end of the pipe main body 71.
The riser pipe connecting portion 92 is cylindrical and extends downward from the inner peripheral edge of the bottom plate 91. That is, the outer diameter of the riser pipe connecting portion 92 is smaller than the outer diameter of the pipe main body 71.

The siphon actuation member 93 has a water drain plate 96 and a pair of support legs 97 .
The water drain plate 96 is circular and is disposed along a horizontal plane. The water drain plate 96 is disposed within the pipe main body 71 and spaced apart from the pipe main body 71. The water drain plate 96 is disposed at the same vertical position as the vertical middle portion of the horizontal pipe connection portion 23.
Each support leg 97 is flat. Each support leg 97 is arranged along the central axis of the horizontal pipe connection portion 23 and in the vertical direction. A pair of support legs 97 is arranged spaced apart from each other in directions perpendicular to the central axis of the horizontal pipe connection portion 23 and the vertical direction. Upper ends of the pair of support legs 97 are respectively joined to the water drain plates 96. Lower ends of the pair of support legs 97 are respectively joined to the upright pipe connection portion 92.
The piping joint 90 configured as above is integrally formed by, for example, injection molding.

As shown in Figure 15, the standpipe connection portion 92 of the piping joint 90 is connected to the upper end of the standpipe 7 via a socket 98.

In the piping joint 90 configured as described above, the siphon actuation member 93 generates a siphon effect, allowing the interior of the standpipe 7 to be filled with wastewater and drained efficiently.
Furthermore, when rainwater flows from the horizontal pipe 6 into the pipe main body 71 , the water drain plate 96 and the pair of support legs 97 can be prevented from interfering with the rainwater flowing in from the horizontal pipe 6 .

"Verification of drainage capacity"
The following three types of verification tests were carried out to verify the effectiveness of the piping joint 35 shown in FIG. 10 when actually draining water.
In the first verification test, a three-story building 50 shown in FIG. 18 was used, and a eaves gutter mock-up 55 measuring 30 cm in width, 35 cm in depth, and 8 m in length was installed horizontally on the third floor 53.
A dogleg-shaped horizontal pipe (horizontal pull pipe: nominal diameter 150A) 56 shown in Fig. 19 was connected to one end wall 55a of the eaves gutter simulator 55, and the horizontal pipe connection part 23 of the piping joint 35 configured as shown in Fig. 10 was connected to the tip of this horizontal pipe 56. A vertical pipe (nominal diameter 75A) 58 with a height of about 6 m, which runs from the third floor 53 of the building 50 through the second floor 52 to the first floor 51, was connected to the standpipe connection part 25 of the piping joint 35, and the standpipe 58 was connected via a connecting pipe 60 to a rainwater manhole 59 installed on the first floor 51.
This rainwater cistern 59 was connected to a drainage pit 62 via a horizontal pipe 61 installed on the first floor 51. In addition, a roof drain 5 having the structure shown in Figure 1 was installed inside the end wall 55a of the eaves gutter simulator 55 to which the horizontal pipe 56 was connected.

The first verification test was conducted using the verification test device described above to test the drainage performance when a predetermined amount of water was flowed into the eaves gutter simulator 55. The first verification test was conducted by flowing a predetermined amount of tap water (5 L/s, 10 L/s, 15 L/s, 20 L/s) into the eaves gutter, and draining the water from a 30 cm long horizontal pipe 56 through a piping joint 35 into a standpipe 58. The water level (hereinafter referred to as the "underwater water level") was measured at a position 50 cm away from the end wall 55a of the eaves gutter simulator 55 in the longitudinal direction of the eaves gutter simulator 55. The results of the first verification test are shown in Figure 21.

In the second verification test, the horizontal pipe 56 attached to the end wall 55a of the eaves gutter simulator 55 in the verification test device described above was removed, and instead, an L-shaped horizontal pipe (horizontal pull pipe: nominal diameter 150A) 65 was connected to the side wall 55b 45 cm away from the end wall 55a of the eaves gutter simulator 55, as shown in Figure 20. The horizontal pipe connection portion 23 of the piping joint 35 shown in Figure 10 was connected to the tip of this horizontal pipe 65. The length of the horizontal pipe 65 along the length of the eaves gutter simulator 55 was 1.0 m, and the length of the horizontal pipe 65 along the width of the eaves gutter simulator 55 was 30 cm. A roof drain 5 with the structure shown in Figure 1 was placed inside the side wall 55b of the eaves gutter simulator 55 at the portion where the horizontal pipe 65 was connected.
The second verification test was carried out by running predetermined amounts of tap water (5 L/s, 10 L/s, 15 L/s, 20 L/s) into the eaves gutter and discharging the water from the 1.0 m long horizontal pipe 65 through the piping joint 35 into the upright pipe 58. The water level was measured at a position 50 cm away from the end wall 55a of the eaves gutter simulator 55 in the longitudinal direction of the eaves gutter simulator 55. The results of the second verification test are shown in Figure 21.

The third verification test was conducted under the same conditions as the first verification test, using the same verification equipment as the first verification test, but replacing the piping fitting 35 with a 90° Y-shaped fitting, connecting a vertical pipe with a nominal diameter of 150A to a horizontal pipe with a nominal diameter of 150A. The results of the third verification test are shown in Figure 21.

In the graph shown in Figure 21, the horizontal axis represents the amount of water (5 L/s, 10 L/s, 15 L/s, 20 L/s) flowing into the eaves gutter simulator 55, and the vertical axis represents the water level (0 to 300 mm) below the eaves gutter simulator 55.
As shown in the graph in Figure 21, in all verification tests, the underwater water level gradually rose as the amount of water flowing into the eaves gutter simulator 55 increased. When comparing the same amount of water in the graph in Figure 21, a lower underwater water level indicates better drainage.
Note that the graph shown in Figure 21 does not include the results of the third verification test when the water volume was 25 L/s because water overflowed from the eaves gutter simulator 55 when the water volume was 25 L/s, and the evaluation was discontinued.

The results of the third verification test correspond to the conventional example, while the results of the first and second verification tests correspond to test examples of the piping joint equipped with the siphon activation member according to the present invention.
The results of the first and second verification tests show that when the water volume is large (10 to 20 L/s), the water level is lower than in the results of the third verification test, and both show excellent drainage properties.
Comparing the results of the first verification test using horizontal pipe 56 with the results of the second verification test using horizontal pipe 65, it was found that, although there was a slight difference in water level, good drainage was achieved in both verification tests, whether the horizontal pipe length was 0.3 m or 1.0 m. This shows that even if the horizontal pipe length is 1.0 m, there is no problem with the occurrence of the siphon phenomenon.

In the third verification test, which corresponds to the conventional example, a standpipe with a nominal diameter of 150A was used, which is twice the diameter of the standpipe with a nominal diameter of 75A used in the first and second verification tests. It was found that the structure of the present invention exhibited superior drainage performance even when using a standpipe with a nominal diameter of 75A, which is half the diameter of the conventional structure.
This is thought to be the result of the siphon actuation member provided inside the piping joint utilizing the siphon phenomenon to allow smooth drainage.

S, S2, S3...Drainage piping system,
1... Rooftop floor,
2...waist wall,
3...Piping joints,
5...Roof drain,
6...Horizontal pipe,
7...vertical pipe,
7B...Second vertical pipe,
8...exterior wall,
22, 71...Pipe main body part,
22b...opening,
23...Horizontal pipe connection part,
25, 92... vertical pipe connection part,
26...Reduced diameter part,
28...Cover member,
28b...slope,
28e... rectifying plate,
30... rectifying plate,
35, 40, 50, 70, 90...Pipe fittings,
36, 80, 93...Siphon actuation members,
72...Second vertical pipe connection part.

Claims (12)

A rainwater piping joint provided at the connection between a horizontal pipe and a vertical pipe,
The pipe includes a pipe main body portion arranged with its central axis oriented vertically, a horizontal pipe connecting portion formed on a side surface of the pipe main body portion and connected to the horizontal pipe, and a standpipe connecting portion formed on a lower portion of the pipe main body portion and into which the standpipe is inserted , the inner diameter of the standpipe connecting portion being smaller than the inner diameter of the horizontal pipe connecting portion ,
The inner diameter of the vertical pipe connecting portion is 1/2 or more and 2/3 or less of the inner diameter of the horizontal pipe connecting portion,
An opening is formed at the top of the pipe body, and a lid member that can open and close the opening is removably attached to the opening . A rainwater piping joint as described in claim 1 , wherein a water flow guide slope inclined with respect to both the central axis of the horizontal pipe connection portion and the central axis of the vertical pipe connection portion is formed on the lower part of the cover member. The rainwater piping joint according to claim 1 or 2 , wherein the cover member is provided with one or more straightening plates that protrude inward of the pipe main body. The rainwater piping joint according to any one of claims 1 to 3, wherein the standpipe connection portion is formed at the lower part of the pipe main body via a reduced diameter portion. The rainwater piping joint according to any one of claims 1 to 4, wherein one or more straightening plates are protruded from the inner surface of the pipe main body. The rainwater piping joint according to any one of claims 1 to 5, wherein the vertical pipe connection portion is eccentrically arranged relative to the pipe main body portion. a second standpipe connecting portion formed on an upper portion of the pipe main body and to which a second standpipe is connected;
The rainwater piping joint according to any one of claims 1 to 6 , wherein the second upright pipe connection portion is arranged between the opening and the pipe main body portion . A siphon actuation member is provided inside ,
A rainwater piping joint according to any one of claims 1 to 7 , wherein the siphon activation member has a flow straightening piece extending toward the central axis of the pipe main body . The rainwater piping joint according to any one of claims 1 to 8, wherein the pipe main body and the vertical pipe connection portion are integrally formed. The rainwater piping joint according to any one of claims 1 to 9,
the horizontal pipe connected to the horizontal pipe connection portion;
The standpipe is connected to the standpipe connection portion.
Stormwater drainage piping system. A rainwater drainage piping system comprising: a roof drain installed on the roof floor of a building; a horizontal pipe connected to the roof drain and passing through the waist wall of the roof floor of the building; a rainwater piping joint connected to the outer end of the horizontal pipe; and a vertical pipe connected to a lower part of the rainwater piping joint,
The rainwater drainage piping system, wherein the rainwater piping joint is the rainwater piping joint according to any one of claims 1 to 9 . A building comprising the storm water drainage piping system according to claim 10 or 11.