JP2022052758A - Pipe joint and drain pipe system equipped with the pipe joint - Google Patents

Abstract

To provide a pipe joint that does not increase a diameter of a vertical pipe even if a bore diameter of a horizontal pipe is increased by improving the inflow and drainage of rainwater into the vertical pipe, and a drain pipe system equipped with the pipe joint .SOLUTION: There is provided a pipe joint installed at a connection between a horizontal pipe and a vertical pipe, comprising: a pipe body that is arranged with a central axis facing up and down; a horizontal pipe connecting portion formed on a side surface of the pipe body and connected to the horizontal pipe; and a vertical pipe connecting portion formed in a lower part of the pipe body and to which the vertical pipe is connected. An inner diameter of the vertical pipe body is smaller than an inner diameter of the horizontal pipe connecting portion.SELECTED DRAWING: Figure 1

Description

The present invention relates to a pipe joint and a drainage pipe system including a pipe joint.

In recent years, as the frequency of torrential rains has increased, rainwater pipes have tended to be enlarged in order to efficiently drain rainwater from buildings.
For example, in the drainage piping system on the rooftop floor of the building shown in FIG. 22, a frame-shaped roof drain 102 is installed along the portion where the waist wall 101 is erected in the corner portion of the rooftop floor 100 of the building. The horizontal pipe 103 connected to the roof drain 102 is installed so as to horizontally penetrate the waist wall 101, and the vertical pipe 106 for drainage is connected to the outer end of the horizontal pipe 103 via the elbow pipe 105 (for example,). See Non-Patent Document 1).

In the drainage piping system on the rooftop of a building, as shown in FIG. 23, there is known a drainage piping system in which a cheese joint 107 is provided at a connection portion between a horizontal pipe 103 and a vertical pipe 106 instead of an elbow pipe 105. A removable lid plate 108 is provided on the ceiling of the cheese joint 107.
Alternatively, as shown in FIG. 24, there is known a drainage piping system in which a drainage mass 109 is provided in place of the elbow pipe 105 at the connection portion between the horizontal pipe 103 and the vertical pipe 106. A removable lid plate 110 is provided on the ceiling of the drainage mass 109.

KANESO Co., Ltd. "Product information Cast iron roof drain Waterproof layer tensioning width 100 mm Horizontal pull-in type", [online], [Search on September 17, 3rd year of Reiwa], 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 the horizontal pipe 103 via the roof drain 102 and drained by flowing into the vertical pipe 106 via the elbow pipe 105.
In a general drainage piping system, the horizontal pipe 103 and the vertical pipe 106 are designed to have the same diameter, so in consideration of measures such as the recent guerrilla rainstorm, the horizontal pipe 103 and the vertical pipe 106 are used to improve the drainage capacity. Both tend to increase in diameter.

However, if the diameter of the vertical pipe is increased to prevent heavy rain, the weight of the pipe will increase in a building with many floors, and a stronger support structure is required to withstand the weight of the pipe or wind power. There is a problem. In addition, various effects may occur, such as the number of pipe support points by the support metal fittings, the need for higher strength support metal fittings, and the need to reexamine the skeleton strength in some cases. In addition, there is a risk of various effects on the design and construction of the building, such as securing storage space for large-diameter vertical pipes, increasing the size of heavy transportation equipment, and requiring more man-hours.

The present invention has been made in view of the above-mentioned circumstances, and by improving the inflow and drainage of rainwater into the vertical pipe, the diameter of the vertical pipe is increased even if the diameter of the horizontal pipe is increased. It is an object of the present invention to provide a pipe fitting that does not exist and a drainage pipe system provided with the pipe joint.

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

Even if the diameter of the horizontal pipe is increased as a countermeasure against guerrilla rainstorms, the inner diameter of the vertical pipe connection is smaller than the inner diameter of the horizontal pipe connection, so it is possible to connect a vertical pipe with a smaller inner diameter. can. Even if the diameter of the horizontal pipe becomes large and the amount of rainwater flowing from the horizontal pipe to the vertical pipe increases, gravity acts on the rainwater flowing through the vertical pipe and the rainwater is discharged faster than the rainwater flowing through the horizontal pipe. There is no problem with drainage capacity.
Even if the diameter of the horizontal pipe is increased as a countermeasure against guerrilla rainstorms, the diameter of the vertical pipe can be reduced, so that it is not necessary to increase the strength of the metal fittings that support the vertical pipe, and the required number of support metal fittings can be reduced. Moreover, since the diameter of the vertical pipe can be reduced, the load on the skeleton can be reduced. In addition, it is no longer necessary to use a large-diameter vertical pipe, the storage space for the large-diameter vertical pipe can be reduced, it contributes to the miniaturization of heavy transportation equipment, and it is possible to provide a structure that does not impose a load on the design and construction of the building.

"2" In the piping joint according to the present embodiment, it is possible to adopt a configuration in which an opening is formed in the upper part of the pipe main body and a lid member that can open and close the opening is detachably attached.

If the opening of the pipe body can be opened and closed with a lid member, if foreign matter accumulates inside the pipe body or clogging occurs due to foreign matter, remove the lid member and open the inside of the piping joint. It is possible to provide a pipe fitting that can be cleaned and has excellent maintainability.

"3" In the present embodiment, it is possible to adopt a configuration in which a water flow guiding slope that is inclined with respect to both the central axis of the horizontal pipe connecting portion and the central axis of the vertical pipe connecting portion is formed in the lower part of the lid member.

If a water flow guiding slope is provided inside the pipe body, the flow of rainwater flowing from the horizontal pipe to the inside of the pipe body can be smoothly changed in direction and introduced to the vertical pipe side. Therefore, the flow of rainwater flowing inside the pipe body can be smoothed.

"4" In the present embodiment, it is possible to adopt a configuration in which the lid member is provided with one or more straightening vanes protruding inward of the tube main body.

By providing a straightening vane protruding inside the pipe main body of the lid member, the flow of rainwater flowing from the pipe main body to the vertical pipe connection portion can be smoothed.

"5" In the present embodiment, it is preferable that the vertical pipe connecting portion is formed at the lower part of the pipe main body portion via the reduced diameter portion.

By providing a vertical pipe connection portion under the pipe main body portion via a reduced diameter portion, rainwater flowing from the pipe main body portion toward the vertical pipe can be smoothly introduced.

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

By providing a straightening vane inside the pipe body, the flow of rainwater flowing from the pipe body to the vertical pipe connection can be smoothed.

"7" In this embodiment, it is possible to adopt a configuration in which the vertical pipe connecting portion is eccentrically arranged with respect to the pipe main body portion.

If the vertical pipe connection portion is eccentrically connected to the pipe main body portion, the vertical pipe can be installed at a position closer to or farther from the outer wall located near the pipe joint. If the vertical pipe can be arranged closer to the outer wall, the wind pressure acting on the vertical pipe can be reduced, so that the burden on the support structure of the vertical pipe is reduced.

"8" In the present embodiment, a configuration having a second vertical pipe connecting portion formed on the upper part of the pipe main body portion and to which the second vertical pipe is connected can be adopted.

By having the second vertical pipe connection portion, the pipe joint (pipe main body portion) becomes a cheese joint having a known configuration, and the cost required for the construction of the pipe joint can be reduced.

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

By providing the siphon starting member inside, even if a large amount of drainage flows from the horizontal pipe to the pipe joint, it is possible to provide a configuration in which a large amount of drainage can be smoothly performed from the pipe joint to the vertical pipe side. Even when the inner diameter of the vertical pipe is smaller than the inner diameter of the horizontal pipe, the siphon phenomenon can be used to achieve high drainage in the vertical pipe.

"10" The drainage piping system of this embodiment is connected to a roof drain installed on the roof floor of a building, a horizontal pipe connected to the roof drain and penetrating the waist wall of the roof floor of the building, and an outer end of the horizontal pipe. A drainage pipe system including a pipe joint and a vertical pipe connected to the lower part of the pipe joint, wherein the pipe joint is the pipe joint according to any one of the above.

With this type of drainage piping system, even if the diameter of the horizontal pipe is increased as a countermeasure against guerrilla rainstorms, a pipe joint with the inner diameter of the vertical pipe connection part smaller than the inner diameter of the horizontal pipe connection part is applied. Therefore, it is possible to connect a vertical pipe having a smaller inner diameter. Even if the diameter of the horizontal pipe becomes large and the amount of rainwater flowing from the horizontal pipe to the vertical pipe increases, gravity acts on the rainwater flowing through the vertical pipe and the rainwater is discharged faster than the rainwater flowing through the horizontal pipe. There is no problem with drainage capacity.
Even if the diameter of the horizontal pipe is increased to prevent guerrilla rainstorms, the diameter of the vertical pipe can be reduced, so that it is not necessary to improve the strength of the metal fittings that support the vertical pipe more than necessary, and the required number of support metal fittings can be reduced. A drainage piping system can be provided.
In addition, by reducing the diameter of the vertical pipe, it is possible to reduce the load on the skeleton to which the drainage piping system is applied. In addition, it is possible to eliminate the use of large-diameter vertical pipes, reduce the storage space for large-diameter vertical pipes, contribute to the miniaturization of heavy transport machines, and provide a drainage piping system that does not impose a burden on the design and construction of buildings.

The pipe joint of the present invention can be applied to a structure in which 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 as a countermeasure against guerrilla rainstorms. It is possible to provide a joint that can reduce the diameter of the vertical pipe.

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 portion between a horizontal pipe installed on the roof floor of a building and a vertical pipe arranged along an outer wall. Is. It is a perspective view of the joint for piping. It is a perspective view which made the main part of the joint for piping a cross section. It is sectional drawing which shows the internal structure of the joint for piping. It is sectional drawing which follows the AA line shown in FIG. It is explanatory drawing which shows the positional relationship of the vertical pipe connection part with respect to the pipe main body part in the pipe joint which concerns on 1st Embodiment. It is a block diagram which shows the pipe joint which concerns on the 2nd Embodiment of this invention which changed the positional relationship of the vertical pipe connection part with respect to the pipe main body part. It is a block diagram which shows the pipe joint which concerns on the 3rd Embodiment of this invention which changed the positional relationship of the vertical pipe connection part with respect to the pipe main body part. The pipe joint according to the 4th Embodiment of this invention is shown, (a) is a partial sectional view, (b) is a front view. It is a transmission perspective view which shows the joint for piping which concerns on 5th Embodiment of this invention. It is sectional drawing which shows an example of the drainage piping system using the piping joint which concerns on 6th Embodiment of this invention. It is a perspective view of the joint for piping. It is a perspective view which disassembled the different diameter socket and the siphon start member used for the joint for piping. It is a perspective view of the state which the same diameter difference socket and the siphon activation member are assembled. It is sectional drawing which shows an example of the drainage piping system using the piping joint which concerns on 7th Embodiment of this invention. It is a perspective view which a part of the joint for piping was broken. It is sectional drawing which follows the A2-A2 line shown in FIG. It is a perspective view which shows the outline of the verification test apparatus performed in order to verify the influence according to the length of a transverse tube. It is explanatory drawing which shows the structure of the verification test apparatus provided with the horizontal tube of length 0.3m. It is explanatory drawing which shows the structure of the verification test apparatus provided with the horizontal tube of length 1.0m. It is a graph which shows the test result by the verification test apparatus shown in FIGS. 19 and 20. It is a block diagram which shows the 1st conventional example which concerns on a drainage piping system. It is a block diagram which shows the 2nd conventional example which concerns on a drainage piping system. It is a block diagram which shows the 3rd conventional example which concerns on a drainage piping system.

Hereinafter, an example of a drainage piping system provided with a piping joint according to the first embodiment of the present invention will be described with reference to FIGS. 1 to 5.
The drainage piping system provided with the piping joint according to the present embodiment is applied to drainage of a building such as a building or a condominium, for example.
In the first embodiment shown in FIG. 1, the piping joint 3 is provided on the outside of the connection portion between the roof floor 1 of the building and the waist wall 2 erected at the corner portion of the roof floor 1. A frame-shaped roof drain 5 is provided inside the joint portion between the roof floor 1 and the waist wall 2, and a piping joint 3 is provided on the outer end side of a horizontal pipe 6 connected to the roof drain 5 and horizontally penetrating the waist wall 2. It is connected, and the vertical pipe 7 is connected to the lower part of the pipe joint 3. In the first embodiment, the drainage pipe system S is configured by including the roof drain 5, the horizontal pipe 6, the pipe joint 3, and the vertical pipe 7.
The vertical pipe 7 extends downward along the outer wall 8 of the building and is connected to a drainage facility such as a water collecting basin (not shown) or another drainage pipe provided on the ground near the building.

The roof drain 5 has an L-shaped frame body 12 composed of a bottom plate 10 and a side plate 11, and a tubular member 13 for connecting pipes is integrated with the frame body 12. The tubular member 13 extends to the outside of the side plate 11 so as to extend outward from the through hole 11a formed on the bottom side of the side plate 11.
The roof drain 5 has a bottom plate 10 installed at a corner portion of the roof floor 1, the side plate 11 is brought into close contact with the bottom of the waist wall 2, and the tubular member 13 is inserted into the through hole 2a formed at the bottom of the waist wall 2. It is installed in the corner of the roof floor 1.
An L-shaped frame-shaped strainer 17 having a plurality of water passage holes is detachably attached to the inside of the frame body 12 by bolts 18 and nuts 19, and a roof drain 5 is configured by the frame body 12 and the strainer 17.

By attaching the strainer 17 to the frame body 12 with bolts 18 and nuts 19, the end of the waterproof sheet 15 on the roof floor 1 side is sandwiched and pressed by the bottom plate 10 of the roof drain 5 and the bottom of the strainer 17. Similarly, by the above-mentioned bolting, the end portion of the waterproof sheet 16 on the waist wall 2 side is sandwiched and pressed by the upper part of the side plate 11 and the strainer 17.
The roof drain 5 applied in the present embodiment is an example, and the roof drain structure applied to the present invention may be a roof drain having a general structure such as a general frame type or a box type as appropriate. ..

A through hole 2a is formed horizontally in the waist wall 2 at a position in contact with the rooftop floor 1. The drainage horizontal pipe 6 is arranged in the through hole 2a so that one end side thereof slightly protrudes to the outside of the through hole 2a and the other end side is 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 portion 22, a horizontal pipe connecting portion 23, and a vertical pipe connecting portion 25. The tube main body 22 is installed at a position close to the waist wall 2 with the central axis arranged vertically. The pipe main body 22 has a cylindrical shape, and a cylindrical horizontal pipe connecting portion 23 is projected laterally from a part of the side surface 22a thereof. When the pipe main body 22 is installed, the central axis thereof may be slightly inclined from the vertical line.

The horizontal pipe connecting portion 23 has an opening having a size into which the outer end of the horizontal pipe 6 can be inserted, and the lateral pipe connecting portion 23 is provided by means such as inserting and adhering the outer end of the horizontal pipe 6 into the opening. A horizontal pipe 6 is connected to the pipe. The inner diameter of the horizontal pipe connecting portion 23 is set to the inner diameter into which the horizontal pipe 6 can be inserted as described above, but the inner diameter of the pipe main body portion 22 is also formed to be about 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 portion 22.
In the configurations shown in FIGS. 1 to 3, the height dimension of the pipe main body 22 is formed to be slightly larger than the outer diameter of the horizontal pipe connecting portion 23, so that the uppermost end position of the horizontal pipe connecting portion 23 is the pipe main body 22. It is located slightly below the upper end of the pipe, and the lowermost position of the horizontal pipe connecting 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 FIGS. 2 and 3, the piping joint 3 is installed with the central axis of the pipe main body 22 vertical, but the vertical joint 3 is installed below the pipe main body 22 via a constricted diameter portion 26. A pipe connecting portion 25 is formed. The reduced diameter portion 26 is formed in an inwardly constricted shape so as to gradually narrow the diameter downward from the lower end of the tube main body portion 22, and the vertical pipe connecting portion 25 is formed at the lower end of the reduced diameter portion 26. Further, the vertical pipe 7 is inserted into the vertical pipe connecting portion 25 and is fixed by means such as adhesion. The vertical pipe connecting portion 25 has a cylindrical shape, and is formed to have an inner diameter into which the upper end portion of the vertical pipe 7 can be inserted.

In the configuration of the first embodiment shown in FIGS. 1 to 3, the inner diameter of the vertical pipe connecting portion 25 is set to about 1/2 of the inner diameter of the pipe main body portion 22. Further, since the inner diameter of the vertical pipe connecting portion 25 is formed to be about 1/2 of the inner diameter of the horizontal pipe 6, the inner diameter of the vertical pipe 7 is formed to be about 1/2 of the inner diameter of the horizontal pipe 6. There is.
In the present embodiment, the inner diameter of the vertical pipe 7 is formed to be about 1/2 of the inner diameter of the horizontal pipe 6, but the inner diameter of the vertical pipe 7 is about 1/2 to 2/3 of the inner diameter of the horizontal pipe 6. It may be formed. That is, the inner diameter of the vertical pipe connecting portion 25 may be in the range of about 1/2 to 2/3 with respect to the inner diameter of the pipe main body portion 22. In any case, in the present embodiment, the inner diameter of the vertical pipe connecting portion 25 (≈inner diameter of the vertical pipe 7) is formed smaller than the inner diameter of the pipe main body portion 22 (≈inner diameter of the horizontal pipe 6).

The pipe joint 3 includes an olefin resin such as PE (polyethylene), PP (polypropylene) or PB (polybutene), a hard vinyl chloride resin, an ABS (acrylonitrile / butadiene / styrene copolymer resin), and an AES (acrylonitrile / ethylene / It is formed by injection molding a resin such as styrene copolymer resin).

In the piping joint 3, an opening 22b is formed at the upper end of the pipe main body 22, and the opening 22b is closed by a detachably fitted lid member 28. The lid member 28 is a columnar member that is fitted and fitted into the opening 22b. On the bottom side thereof, the opening 22b is closed and from the upper end side of the pipe body 22 to the bottom side of the pipe body 22. An extending portion 28a is formed. The extension portion 28a is for water flow guidance that is inclined with respect to both the central axis 23a of the horizontal pipe connecting portion 23 and the central axis 25a of the vertical pipe connecting portion 25 in a state where the opening 22b is closed by the lid member 28. The slope 28b is formed. As shown in FIG. 3, the slope 28b is inclined so as to be a concave arc surface facing diagonally downward.

Since the slope 28b is formed on the extending portion 28a, the vertical wall thickness of the lid member 28 is small on the lateral pipe connecting portion 23 side of the lid member 28, and gradually increases as it goes to the opposite side. Is formed in. Therefore, the lower end 28c of the extending portion 28a extends to the lower side of the pipe main body portion 22, in other words, at a height position corresponding to the lowermost end position of the horizontal pipe connecting portion 23.
When the amount of rainwater flowing in from the horizontal pipe connection portion side of the slope 28b of the lid member 28 increases, the direction of rainwater flow is smoothly changed downward so that turbulence or the like does not occur inside the piping joint 3. It is provided to regulate the flow of rainwater. Further, the lid 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 portion 28d is formed at the upper end portion of the lid member 28, and when the opening portion 22b of the pipe body portion 22 is closed by the lid member 28, the upper surface of the peripheral edge of the opening portion of the pipe body portion 22 is flanged. 28d is designed to cover.

A plurality of straightening vanes 30 are projected from the lower end of the tube main body 22 to the lower end of the reduced diameter portion 26 at a predetermined interval around the tube main body 22 and the reduced diameter portion 26. The straightening vane 30 is arranged so as to extend in the length direction (vertical direction) of the tube main body 22 from the lower end of the tube main body 22 to the lower end of the reduced diameter portion 26. The straightening vane 30 may also be formed on the lower side of the tube main body 22 as long as it does not interfere with the lower end 28c of the extending portion 28a.
In the structure of the first embodiment, six straightening vanes 30 are provided as shown in FIGS. 3 to 5. These straightening vanes 30 are formed so that the protrusion amount (width) on the upper side is large and the protrusion amount (width) on the lower side is gradually reduced. In the present embodiment, the number of installed straightening vanes 30 is 6, but the number of installed straightening plates 30 may be one or more. It is preferable that a plurality of straightening vanes 30 are provided radially around the tube axis of the reduced diameter portion 26.

When rainwater or the like flows along the waterproof sheet 15 and reaches the roof drain 5, the rainwater passes through the through hole 11a and flows into the horizontal pipe 6, and the pipe main body portion 22 passes through the horizontal pipe connecting portion 23 of the piping joint 3. It flows into the inside of. The rainwater that has flowed into the pipe body 22 changes its flow direction downward, passes through the reduced diameter portion 26, travels through the vertical pipe 7, and is discharged to the drainage facility side such as a drainage basin.

When the amount of rainwater flowing into the inside of the pipe main body 22 increases, the rainwater comes into contact with the diagonally downward concave slope 28b, and the direction in which the rainwater flows is smoothly changed from the horizontal direction to the downward direction. Therefore, even if a large amount of rainwater flows into the pipe joint 3, there is little possibility that turbulence or reverse flow due to turbulence will occur inside the pipe body 22, and good drainage capacity can be obtained. ..
Further, since a plurality of rectifying plates 30 are provided from the bottom of the pipe main body 22 to the reduced diameter portion 26, the flow of rainwater flowing from the bottom side of the pipe main body 22 to the reduced diameter portion 26 can be rectified. As a result, rainwater can be smoothly discharged from the piping joint 3 to the vertical pipe 7.

On the other hand, there is a tendency to increase the diameter of the horizontal pipe 6 in order to improve the drainage capacity due to recent measures against guerrilla rainstorms. In the structure of the present embodiment, the inner diameter of the vertical pipe 7 is smaller than the inner diameter of the horizontal pipe 6. When rainwater flows into the vertical pipe 7, gravity acts on the rainwater flowing through the vertical pipe 7, so that the rainwater flowing through the vertical pipe 7 is discharged more smoothly than the rainwater flowing through the horizontal pipe 6. Therefore, even if a large amount of rainwater flows into the vertical pipe 7 through the horizontal pipe 6, the flow velocity of the rainwater flowing through the vertical pipe 7 is faster, and even if the vertical pipe 7 has a small inner diameter, the vertical pipe 7 is sufficient. Good drainage. As an example, when the outer diameter of the horizontal pipe 6 is 150 mm, the outer diameter of the vertical pipe 7 can be 75 mm. The outer diameter of the vertical pipe 7 may be 100 mm or the like.

In the present embodiment, since the vertical pipe 7 having a diameter smaller than that of the horizontal pipe 6 is provided, the weight of the vertical pipe 7 can be reduced as compared with the conventional structure in which the vertical pipe having the same outer diameter as the horizontal pipe 6 is provided. Since the weight of the vertical pipe 7 can be reduced, the number of metal fittings that support the vertical pipe 7 can be reduced, the strength of the support metal fittings can be small, and an excessive load on the skeleton can be reduced. Further, when the vertical pipe 7 is installed, the storage space can be reduced, the size of the heavy transporting machine can be suppressed, and there is an advantage that a margin is created in the design and construction of the building.

FIG. 6 is an explanatory diagram schematically depicting the positional relationship between the central axis a1 of the pipe main body 22 and the central axis a2 of the vertical pipe connecting portion 25 in the piping joint 3 according to the first embodiment. The piping joint 3 of the first embodiment has a configuration in which the central axis a1 and the central axis a2 overlap at the same position.
FIG. 7 is an explanatory diagram schematically depicting the positional relationship between the central axis a1 of the pipe main body 22 and the central axis a2 of the vertical pipe connecting portion 25 in the piping joint 40 of the second embodiment.
In the structure of the second embodiment, the vertical pipe connecting portion 25 is provided below the reduced diameter portion 26, which is the same as the structure of the first embodiment, but the vertical pipe connecting portion 25 is as shown in FIG. The difference is that it is formed in an eccentric position on the right side.
In the piping joint 40 of the second embodiment, the central axis a1 and the central axis a2 are separated from each other to the left and right in FIG. 7. That is, the vertical pipe connecting portion 25 is installed at a position farther from the outer wall 8 with respect to the structure of the first embodiment. Therefore, in the structure of the second embodiment, the vertical pipe 7 can be arranged at a position slightly distant from the outer wall 8 as compared with the structure of the first embodiment.

FIG. 8 is an explanatory diagram schematically depicting the positional relationship between the central axis a1 of the pipe main body 22 and the central axis a2 of the vertical pipe connecting portion 25 in the piping joint 50 of the third embodiment. In the structure of the third embodiment, the vertical pipe connecting portion 25 is provided below the reduced diameter portion 26, which is the same as the structure of the first embodiment, but the vertical pipe connecting portion 25 is as shown in FIG. The difference is that it is formed in an eccentric position on the left side.
In the piping joint 50 of the third embodiment, the central axis a1 and the central axis a2 are separated from each other to the left and right in FIG. That is, the vertical pipe connecting portion 25 is formed at a position closer to the outer wall 8 with respect to the structure of the first embodiment. Therefore, in the structure of the third embodiment, the vertical pipe 7 can be arranged at a position closer to the outer wall 8 than the structure of the first embodiment.
The fact that the vertical pipe 7 can be arranged at a position close to the outer wall 8 means that the vertical pipe 7 can be supported even if the strength of the metal fittings that support the vertical pipe 7 is made smaller, so that the installation work of the vertical pipe 7 can be facilitated and the equipment cost can be reduced. effective.

By the way, in the above description, an example in which the present embodiment is applied to the roof drain 5 provided on the roof floor 1 of the building has been described, but the roof drain 5 is also installed on a balcony floor, a veranda floor, a terrace floor, or the like. Therefore, the structure of the previous embodiment of the present application can be applied to a roof drain installed on a balcony floor, a balcony floor, a terrace floor, or the like.

In the above embodiment, a plurality of straightening vanes 30 are projected around the circumference of the reduced diameter portion 26 at predetermined intervals, but the installation position of the straightening vanes 30 is not limited to this. For example, one or a plurality of straightening vanes may be provided on the lid member 28, or the slope 28b of the lid member 28 may be formed into a plurality of plates to form a straightening vane so as to protrude from the slope 28b of the lid member 28. A straightening vane may be provided.
In this case, it is preferable that the straightening vane is arranged parallel to the plane passing through the pipe axis of the horizontal pipe connecting portion 23 and the vertical pipe connecting portion 25. Further, it may be formed on the lower inner surface of the pipe main body 22 below the lower end 28c of the extending portion 28a as long as it does not interfere with the reduced diameter portion 26. Further, a straightening vane may be provided on both the lid member 28 and the reduced diameter portion 26.

Further, in the above embodiment, an opening 22b is formed at the upper end of the pipe main body 22 in the piping joint 3, and the opening 22b is provided with a removablely fitted lid member 28. An opening may be provided on the side surface of the main body portion 22, and a lid member detachably fitted may be provided on the side surface opening portion.

Further, the reduced diameter portion 26 provided below the pipe main body portion 22 may be integrally formed with the pipe main body portion 22, or may be formed as a separate member. When the tube main body 22 and the reduced diameter portion 26 are separate members, there are few restrictions on the mold design in injection molding, and the degree of freedom in the shape of the straightening vane provided integrally with the reduced diameter portion 26 can be increased. Further, when the straightening vane is molded as a separate member, it is not necessary to provide a lid member on the pipe body 22, and the pipe body 22 or the diameter reduced before fitting the pipe body 22 and the diameter reduced portion 26. A straightening vane can be arranged inside the portion 26.

FIG. 9 shows a piping joint according to a fourth embodiment of the present invention in which a plurality of rectifying plates 28e are provided on the lid member 28, and the piping joint of this embodiment has a horizontal pipe from the slope 28b of the lid member 28. A plurality of rectifying plates 28e projecting from the connection portion 23 side and the vertical pipe connection portion 25 side are provided.
The straightening vane 28e is formed in a fan shape having a central angle of approximately 90 ° when viewed in a side cross section in the direction shown in FIG. 9A. Further, the plurality of straightening vanes 28e are arranged in parallel to the paper surface (five in the drawing) in a cross-sectional view as shown in FIG. 9 (a) at predetermined intervals, and are arranged at predetermined intervals, as shown in FIG. 9 (b). They are arranged at predetermined intervals in the left-right direction when viewed from the front. In each case, the straightening vane 28e is arranged in parallel with the plane passing through the pipe axis of the horizontal pipe connecting portion 23 and the vertical pipe connecting portion 25.
By providing the straightening vane 28e shown in FIG. 9, the flow of rainwater flowing from the horizontal pipe connecting portion 23 to the vertical pipe connecting portion 25 can be smoothed.

FIG. 10 shows a piping joint of the fifth embodiment in which a siphon starting member is provided inside, and the piping joint 35 of this embodiment is provided with a siphon starting member 36 at the inner bottom portion of the pipe main body 22. Has been done.
The siphon activation member 36 has a short tubular mounting portion 37 and four rectifying pieces 38 extending diagonally upward inward from four locations on the inner peripheral side of the mounting portion 37. A disk-shaped drain plate 39 integrally connected to the upper ends of these four rectifying pieces 38 is provided.

Four rectifying pieces 38 of the siphon starting member 36 extend toward the inner peripheral side of the mounting portion 37 at intervals of 90 °, and each rectifying piece 38 extends from the inner peripheral portion of the mounting portion 37 to the mounting portion 37. It extends diagonally upward in the direction of the central axis. An inclined portion 41 connected to the peripheral surface of the drain plate 39 is formed at a portion where the upper end portion of each rectifying piece 38 is joined to the drain plate 39. The inclined portion 41 is joined while being inclined with respect to the peripheral surface of the drain plate 39.

The mounting portion 37 of the siphon starting member 36 is fixed to the inner peripheral surface of the pipe main body portion 22 by a mounting means such as adhesive.
The four rectifying pieces 38 extending upward from the mounting portion 37 are arranged as desired at the connection portion with the horizontal pipe 6 on the peripheral surface of the pipe main body portion 22. Further, the drain plate 39 is arranged (horizontally) in a direction orthogonal to the central axis of the pipe main body 22, and is located at a position about half the height of the portion where the horizontal pipe 6 is connected to the pipe main body 22. It is installed in.

The opening between the drain plate 39 and the mounting portion 37 is defined as the drainage inflow opening F.
The size, height, and shape of each part of the siphon starting member 36 are adjusted so that the area of the inflow opening F is larger than the opening area on the upper surface side of the mounting portion 37 (opening area of the drop opening). There is.

Since the diameter of the drain plate 39 is formed to be about half of the inner diameter of the pipe body 22, and the drain plate 39 is installed above the mounting portion 37, the drainage flowing into the pipe body 22 is drained. It passes around 39, reaches the reduced diameter portion 26, and is discharged to the vertical pipe 7 side.
Further, when the amount of drainage increases and the drainage reaches a position higher than the drain plate 39 inside the pipe main body 22, a siphon phenomenon occurs when the drainage passes through the siphon starting member 36. That is, it is possible to efficiently drain the water while filling the inside of the vertical pipe 7 with drainage without entraining air bubbles or the like on the vertical pipe 7 side below the siphon starting member 36.
Therefore, a large amount of drainage can be flowed through the vertical pipe 7. Therefore, even if a large amount of drainage flows from the horizontal pipe 6 having a large inner diameter to the vertical pipe 7 side having a small inner diameter, good drainage using the vertical pipe 7 can be ensured.
The length of the horizontal pipe 6 does not need to be longer than necessary, but if it is 2 m or less, for example, it does not affect the occurrence of the siphon phenomenon and there is no problem. Further, the length of the horizontal pipe 6 is more preferably 1.0 m or less.

11 and 12 show the piping joint 70 of the sixth embodiment. A cheese-shaped joint having a known configuration is used for the pipe main body 71 included in the pipe joint 70 of this embodiment.
The piping joint 70 has one horizontal pipe connecting portion 23, a vertical pipe connecting portion 25, and a second vertical pipe connecting portion 72. The horizontal pipe connecting portion 23 is formed on the side surface of the pipe main body portion 71. The vertical pipe connecting portion 25 is formed in the lower part of the pipe main body portion 71.
The second vertical pipe connecting portion 72 is configured to form a cylindrical shape like the vertical pipe connecting portion 25. The second vertical pipe connecting portion 72 is formed on the upper portion of the pipe main body portion 71.
As shown in FIG. 11, the lower end portion of the second vertical pipe 7B is connected to the second vertical pipe connecting portion 72. The drainage pipe system S2 is configured with a roof drain 5, a horizontal pipe 6, a pipe joint 70, a vertical pipe 7, and a second vertical pipe 7B.
The second vertical pipe 7B is configured in the same manner as the vertical pipe 7. The second vertical pipe 7B extends upward from the second vertical pipe connecting portion 72. For example, the second vertical pipe connecting portion 72 extends to the vicinity of the upper end portion of the waist wall 2. The piping joint 70 includes the central axis of the horizontal pipe connecting portion 23, and is plane-symmetrical with respect to the reference plane orthogonal to the central axis of the vertical pipe connecting portion 25 and the second vertical pipe connecting portion 72.

The vertical pipe 7 is connected to the vertical pipe connecting portion 25 of the piping joint 70 via a socket 75 having a different diameter. A siphon activation member 80 is attached to the different diameter socket 75.
As shown in FIGS. 13 and 14, the different diameter socket 75 has a large diameter portion 76, a small diameter portion 77, and a connection 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 each other. 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.
At the connecting portion 78, the outer diameter gradually decreases toward the bottom. The connecting portion 78 is arranged between the large diameter portion 76 and the small diameter portion 77. The upper end portion of the connecting portion 78 is connected to the lower end portion of the large diameter portion 76. The lower end of the connecting portion 78 is connected to the upper end of the small diameter portion 77.
As shown in FIG. 11, the large diameter portion 76 is arranged in the vertical pipe connecting portion 25 and is connected to the vertical pipe connecting portion 25. The upper end portion of the vertical pipe 7 is arranged in the small diameter portion 77 and is connected to the small diameter portion 77.

As shown in FIGS. 13 and 14, the siphon starting member 80 includes a lid member 81, a flange portion 82, and a connecting cylinder portion 83.
For example, 81 has a ridged cylinder shape. An inflow opening 81a for drainage is formed on the side surface of the lid member 81.
The flange portion 82 and the connecting cylinder portion 83 are each formed in a cylindrical shape.
The flange portion 82 covers the lower end portion of the lid member 81 from the radial outside of the lid member 81. The lid member 81 is connected to the flange portion 82.
The connecting cylinder portion 83 is arranged below the flange portion 82. The connection cylinder portion 83 is connected to the flange portion 82 via a connection portion (not shown).
For example, the different diameter socket 75 and the siphon starting member 80 are made of the same material as the piping joint 3.

The siphon activation member 80 configured as described above is assembled to the different diameter socket 75 from above the different diameter socket 75. Specifically, the connection cylinder portion 83 is arranged in the small diameter portion 77, and the flange portion 82 is arranged on the connection portion 78. Then, as shown in FIG. 11, when the different diameter socket 75 is connected to the vertical pipe connecting portion 25 of the piping joint 70, a gap is formed in the radial direction between the pipe main body portion 71 and the lid member 81. Will be done.
Then, when a large amount of rainwater flows in from the inflow opening 81a during heavy rain, the siphon activation member 80 seals the vertical pipe 7 with the vertical pipe 7 filled with water without sucking air. As a result, a siphon phenomenon is generated on the downstream side (lower side) of the siphon starting member 80, and the inside of the vertical pipe 7 can be efficiently drained while being filled with drainage.

As shown in FIG. 11, the lid member 86 is connected to the upper end portion of the second vertical pipe 7B via the socket 85. That is, the upper end of the second vertical 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 connection cylinder 86b provided on one surface of the top plate 86a. It is desirable that the lid member 86 is formed with an air vent hole. The connection cylinder 86b is detachably fitted to the upper end portion of the socket 85. The lid member 86 is in contact with the upper end of the socket 85 from above the upper end.
The worker on the roof floor 1 of the building removes the lid member 86 from the socket 85 through the waist wall 2. Then, the inside of the second vertical pipe 7B and the pipe joint 70 can be cleaned.
By using the piping joint 70 (pipe body 71) which is a joint having a known configuration, the cost required for the construction of the piping joint 70 can be reduced.

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

The siphon activation member 93 has a drain plate 96 and a pair of support legs 97.
The drain plate 96 has a disk shape and is arranged along a horizontal plane. The drain plate 96 is arranged in the pipe main body 71 so as to be separated from the pipe main body 71. The drain plate 96 is arranged at the same position in the vertical direction as the intermediate portion in the vertical direction of the horizontal pipe connecting portion 23.
Each support leg 97 has a flat plate shape. Each support leg 97 is arranged along the central axis of the horizontal pipe connecting portion 23 and in the vertical direction. The pair of support legs 97 are arranged so as to be spaced apart from each other in the direction orthogonal to the central axis of the horizontal pipe connecting portion 23 and the vertical direction. The upper ends of the pair of support legs 97 are joined to the drain plate 96, respectively. The lower ends of the pair of support legs 97 are joined to the vertical pipe connecting portion 92, respectively.
The piping joint 90 configured as described above is integrally formed by, for example, injection molding.

As shown in FIG. 15, the vertical pipe connecting portion 92 of the piping joint 90 is connected to the upper end portion of the vertical pipe 7 via the socket 98.

In the piping joint 90 configured as described above, the siphon phenomenon is generated by the siphon starting member 93, and the inside of the vertical pipe 7 can be efficiently drained while being filled with drainage.
Further, when rainwater flows from the horizontal pipe 6 into the pipe main body 71, it is possible to prevent the drain plate 96 and the pair of support legs 97 from hindering the rainwater flowing from the horizontal pipe 6.

"Verification of drainage capacity"
Using the piping joint 35 shown in FIG. 10, the following three types of verification tests were conducted on the effectiveness when drainage was actually performed.
In the first verification test, a three-story building 50 shown in FIG. 18 was used, and an eaves gutter simulation body 55 having a width of 30 cm, a depth of 35 cm, and a length of 8 m was horizontally installed on the floor 53 on the third floor.
A dogleg-shaped horizontal pipe (horizontal pulling pipe: nominal diameter 150A) 56 shown in FIG. 19 is connected to one end face wall 55a of the eaves gutter simulated body 55, and the tip of the horizontal pipe 56 is shown in FIG. The horizontal pipe connecting portion 23 of the piping joint 35 having the configuration shown is connected. A vertical pipe (nominal diameter 75A) 58 with a height of about 6 m that passes through the floor 53 on the third floor of the building 50 to the floor 52 on the second floor and reaches the floor 51 on the first floor at the vertical pipe connection portion 25 of the piping joint 35. Was connected, and the vertical pipe 58 was connected to the rainwater basin 59 installed on the floor 51 on the first floor via the connecting pipe 60.
The rainwater basin 59 was connected to the drainage pit 62 via a horizontal pipe 61 installed on the floor 51 on the first floor. In the eaves gutter simulated body 55, the roof drain 5 having the structure shown in FIG. 1 was installed inside the end face wall 55a to which the horizontal pipe 56 was connected.

In the first verification test, the drainage property when a predetermined amount of water was flowed through the eaves gutter simulated body 55 was tested using the verification test apparatus described above. In the first verification test, a predetermined amount of tap water (5 L / s, 10 L / s, 15 L / s, 20 L / s) was flowed through the eaves gutter, and the pipe joint 35 was passed through a horizontal pipe 56 having a length of 30 cm. It was done by draining water to the vertical pipe 58. The water level (hereinafter referred to as the underwater water level) at a position 50 cm away from the end face wall 55a of the eaves gutter simulated body 55 in the length direction of the eaves gutter simulated body 55 was measured. The result of the first verification test is shown in FIG.

In the second verification test, in the verification test apparatus described above, the horizontal pipe 56 provided on the end face wall 55a of the eaves gutter simulated body 55 is removed, and instead, as shown in FIG. 20, the end of the eaves gutter simulated body 55 is removed. An L-shaped horizontal pipe (horizontal pull pipe: nominal diameter 150A) 65 was connected to the side wall 55b 45 cm away from the face wall 55a. The horizontal pipe connecting portion 23 of the piping joint 35 having the configuration shown in FIG. 10 was connected to the tip of the horizontal pipe 65. The length of the horizontal pipe 65 along the length direction of the eaves gutter simulated body 55 is 1.0 m, and the length of the horizontal pipe 65 along the width direction of the eaves gutter simulated body 55 is 30 cm. The roof drain 5 having the structure shown in FIG. 1 was arranged inside the side wall 55b at the portion where the horizontal pipe 65 was connected in the eaves gutter simulated body 55.
In the second verification test, a predetermined amount of tap water (5 L / s, 10 L / s, 15 L / s, 20 L / s) was flowed through the eaves gutter, and the pipe joint 35 was connected from the horizontal pipe 65 having a length of 1.0 m. It was passed and drained to the vertical pipe 58. The water level underwater was measured at a position 50 cm away from the end face wall 55a of the eaves gutter simulated body 55 in the length direction of the eaves gutter simulated body 55. The results of the second verification test are shown in FIG.

In the third verification test, in the verification device used in the first verification test, a 90 ° Y pipe was used as a joint instead of the pipe joint 35, and a vertical pipe with a nominal diameter of 150 A was connected to a horizontal pipe with a nominal diameter of 150 A. Then, the verification test was conducted under the same conditions as the first verification test. The result of the third verification test is shown in FIG.

In the graph shown in FIG. 21, the horizontal axis is the amount of water (5 L / s, 10 L / s, 15 L / s, 20 L / s) flowing through the eaves gutter simulated body 55, and the vertical axis is the water level (0 to 300 mm). Indicated.
As shown in the graph of FIG. 21, in any of the verification tests, the water level gradually rises as the amount of water flowing into the eaves gutter simulated body 55 increases. Comparing the same amount of water in the graph of FIG. 21, it means that the lower the value of the sewage level is, the better the drainage property is.
In the graph shown in FIG. 21, the result of the third verification test when the water volume is 25 L / s is not described because water overflowed from the eaves gutter simulated body 55 when the water volume was 25 L / s, and the evaluation was discontinued. And said.

The result of the third verification test corresponds to the conventional example. On the other hand, the first verification test result and the second verification test result correspond to the test example of the pipe fitting provided with the siphon starting member in the present invention.
The first verification test result and the second verification test result show that when the amount of water is large (10 to 20 L / s), the water level is lower than that of the third verification test result, and both are excellent in drainage. There is.
Comparing the results of the first verification test using the horizontal tube 56 and the results of the second verification test using the horizontal tube 65, regardless of whether the length of the horizontal tube is 0.3 m or 1.0 m. Although there was a slight difference in water level, good drainage was exhibited in all verification tests. From this, it was found that even if the length of the horizontal tube is 1.0 m, the siphon phenomenon does not hinder the occurrence.

In the third verification test corresponding to the conventional example, a vertical pipe having a nominal diameter of 150 A is used, and a vertical pipe having a diameter twice that of the vertical pipe having a nominal diameter of 75 A used in the first and second verification tests is used. .. It was found that even if a vertical pipe having a nominal diameter of 75 A, which is half the diameter of the conventional structure, is used, the structure of the present application exhibits better drainage.
It is considered that this is a result of the siphon starting member provided inside the pipe fitting performing smooth drainage by utilizing the siphon phenomenon.

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

Claims (10)

It is a pipe fitting provided at the connection between the horizontal pipe and the vertical pipe.
The pipe main body is arranged so that the central axis faces up and down, the horizontal pipe connection portion formed on the side surface of the pipe main body and connected to the horizontal pipe, and the vertical pipe formed at the lower part of the pipe main body. A pipe joint having a vertical pipe connecting portion to be connected and having an inner diameter of the vertical pipe connecting portion smaller than the inner diameter of the horizontal pipe connecting portion. The pipe fitting according to claim 1, wherein an opening is formed in the upper part of the pipe main body, and a lid member that can open and close the opening is detachably attached. The piping joint according to claim 2, wherein a water flow guiding slope that is inclined with respect to both the central axis of the horizontal pipe connecting portion and the central axis of the vertical pipe connecting portion is formed in the lower portion of the lid member. The pipe fitting according to claim 2 or 3, wherein the lid member is provided with one or more straightening vanes protruding inward of the pipe main body. The piping joint according to any one of claims 1 to 4, wherein a vertical pipe connecting portion is formed in a lower portion of the pipe main body portion via a reduced diameter portion. The pipe fitting according to any one of claims 1 to 5, wherein one or more straightening vanes are provided on the inner surface of the pipe main body. The piping joint according to any one of claims 1 to 6, wherein the vertical pipe connecting portion is eccentrically arranged with respect to the pipe main body portion. The pipe fitting according to any one of claims 1 to 7, further comprising a second vertical pipe connecting portion formed on the upper portion of the pipe main body and to which the second vertical pipe is connected. The pipe fitting according to any one of claims 1 to 8, wherein a siphon starting member is provided inside. A roof drain installed on the rooftop floor of a building, a horizontal pipe connected to the roof drain and penetrating the waist wall of the rooftop of the building, a pipe joint connected to the outer end of the horizontal pipe, and a pipe joint of the pipe. A drainage piping system with a vertical pipe connected to the bottom,
A drainage piping system in which the piping joint is the piping joint according to any one of claims 1 to 9.

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