JP5870053B2 - Drainage pipe fitting - Google Patents

Description

  The present invention relates to a drainage pipe joint for drainage pipes through which drainage from a plurality of watering devices is made to flow together.

  In a building having a plurality of floors such as an apartment house such as an apartment, drainage pipes (hereinafter referred to as drainage vertical pipes) are arranged through the floors from the upper floor to the lower floor. To this drainage vertical pipe, drainage pipes from a plurality of water appliances on each floor, for example, a washroom, a laundry, a bathtub, a kitchen, a toilet, etc. are connected together.

  The piping system includes a single pipe system and a two pipe system. A single-pipe system is a system that does not provide a vertical pipe for ventilation, and uses a single drainage vertical pipe for both drainage and ventilation. The single pipe system has the advantage that the arrangement space can be made compact and the labor of construction is reduced, and in recent years, it has become a major system in buildings such as apartments and hotels.

  In Patent Document 1, when a two-pipe drainage system is renovated to a single-pipe drainage system, the cutting work of the slab can be reduced as much as possible, and the workability is improved by reducing the weight in the piping work of a new building. A possible drainage pipe joint is disclosed.

  In the drainage pipe joint described in Patent Document 1, an upper vertical pipe connection portion, and a cylindrical trunk portion provided below the upper vertical pipe connection portion and having a larger diameter than the vertical pipe connected to the upper vertical pipe connection portion, The lateral branch pipe connecting portion provided continuously to the side wall of the cylindrical body portion, the tapered tubular portion continuously provided at the lower end of the cylindrical body portion, and gradually decreasing in diameter toward the lower side; A drainage pipe joint provided with a swirl vane on the inner wall surface of at least one of the cylindrical barrel portion and the tapered cylindrical portion, and a lower trunk connecting portion connected to the lower end. It has an outer diameter that is almost one size up from the standpipe to be connected, and the side branch pipe connection part has an enlarged diameter part that is larger than the other part at the connection side end of the side branch pipe, It has a curved cylinder part that communicates with the cylindrical trunk part and curves downward toward the cylindrical trunk part, and the lower end of the expanded diameter part is lower than the curved lower end of the curved cylinder part In which is disposed towards.

JP 2011-84922 A

Generally, each drainage pipe on the same floor from each water supply device to the drainage vertical pipe is arranged at the floor level or the lower floor level of the floor and is arranged in the height (vertical or vertical) direction. Therefore, each drain pipe is connected to the drain vertical pipe at almost the same height.
For this reason, for example, when a pair of drainage pipes are connected to the drainage vertical pipe from opposite directions, the sewage flowing from the toilet, for example, gets on the water flow at the time of strong rinsing. The pipe may reach the pipe and rush into the other drain pipe (backflow). As a result, other drainage pipes were clogged and a strange odor was generated.

  An object of the present invention is to provide a drainage pipe joint capable of preventing drainage introduced from the second introduction port of another side branch pipe connection part from entering the first introduction port of one side branch pipe connection part. Is to provide.

(1)
A drainage pipe joint according to an aspect of the present invention is a drainage pipe joint connected to drainage pipes arranged in the vertical direction. The drainage pipe joint includes a cylindrical body part and a plurality of side branch pipe connection parts connected in series to connect the side branch pipes to two opposite side surfaces of the side wall of the cylindrical body part. A first introduction port disposed at a boundary communicating with the cylindrical body of one of the lateral branch pipe connecting portions is provided to communicate with the cylindrical body in the horizontal direction. A second introduction port disposed at a boundary communicating with the cylindrical body of the other side branch pipe connecting portion among the plurality of side branch pipe connecting portions communicates with the cylindrical body and A curved cylindrical portion that curves downward toward the first portion, and the curved cylindrical portion has a virtual tangent of the lower curved surface of the second introduction port of the other lateral branch pipe connecting portion, It is provided so as to pass below the lower end of the first introduction port.

In this specification, the vertical direction refers to the vertical direction. Further, the horizontal direction means a direction perpendicular to the vertical direction.
In the drainage pipe joint, since one horizontal branch pipe connection portion is provided in communication in the horizontal direction, the drainage introduced from the first introduction port of the one side branch pipe connection portion is caused by the inertial force of the drainage. Flows horizontally.
On the other hand, since the virtual tangent at the second introduction port of the lower curved surface of the other side branch pipe connection portion is provided to pass below the lower end of the first introduction port of one side branch pipe connection portion, The drainage introduced from the second introduction port of the other side branch pipe connection portion flows along the lower curved surface.

  In this case, it is possible to prevent the drainage introduced from the second introduction port of the other side branch pipe connection portion from entering the first introduction port of the one side branch pipe connection portion.

(2)
A drainage pipe joint according to another aspect of the present invention is a drainage pipe joint connected to a drainage pipe arranged in the vertical direction. The drainage pipe joint includes a cylindrical body part and a plurality of side branch pipe connection parts connected in series to connect the side branch pipes to two opposite side surfaces of the side wall of the cylindrical body part. A first introduction port disposed at a boundary communicating with the cylindrical body of one of the lateral branch pipe connecting portions is provided to communicate with the cylindrical body in the horizontal direction. A second introduction port disposed at a boundary communicating with the cylindrical body of the other side branch pipe connecting portion among the plurality of side branch pipe connecting portions communicates with the cylindrical body and A curved cylindrical portion that curves downward toward the first portion, and the curved cylindrical portion has a virtual tangent of the curved axial center of the curved cylindrical portion at the second introduction port, and the first introduction of one lateral branch pipe connecting portion. It is provided so as to pass below the lower end of the mouth.

In the drainage pipe joint, since one horizontal branch pipe connection portion is provided in communication in the horizontal direction, the drainage introduced from the first introduction port of the one side branch pipe connection portion is caused by the inertial force of the drainage. Flows horizontally.
On the other hand, the curved cylinder part is provided such that the virtual tangent of the curved axis of the curved cylinder part in the vicinity of the introduction port passes below the lower end of the first introduction port of the one lateral branch pipe connection part. Therefore, the wastewater introduced from the second introduction port of the other horizontal branch pipe connection portion flows in the direction of the virtual tangent line due to the inertial force of the wastewater.

In this case, it is possible to prevent the drainage introduced from the second introduction port of the other side branch pipe connection portion from entering the first introduction port of the one side branch pipe connection portion.
In particular, the drainage may contain not only fluid but also solid matter (dirt). In the case where the water flow is large, the drainage flows from the other side branch pipes into the cylindrical body part by inertia force, but flows downwardly by the curved cylinder part of the other side branch pipe connection part.
Therefore, most of the drainage from the other side branch pipe can be directed downward from the lower end of the first introduction port of the one side branch pipe connection part, and the second introduction port of the other side branch pipe connection part can be directed. It can prevent that the waste_water | drain introduced from rushes into the 1st inlet of the one branch pipe connection part.

(3)
Moreover, another horizontal branch pipe connection part may be connected to the toilet drainage pipe.

In general, the waste water (sewage) in the toilet system is flushed, and the solid matter (sewage) in the waste water is heavy, so even if it flows into the cylindrical trunk from other side branch pipe connections, The inertial force is greater, and it does not drop that much in the cylindrical body.
However, in the present invention, most of the drainage from the other side branch pipes can be directed downward from the lower end of the first introduction port of the one side branch pipe connection part. It is possible to prevent solid matter (dirt) from entering the part or accumulation of solid matter (dirt).

(4)
The cylindrical body portion has a cylindrical portion larger in diameter than the drain pipe, and the large-diameter cylindrical portion includes at least a horizontal branch pipe connecting portion communicating with the horizontal branch pipe, The inner diameter of the large-diameter cylindrical portion including both inlets may be 130 millimeters or more.

  The inner diameter of the large-diameter cylindrical portion including both inlets of the side branch pipe connecting portion is 130 mm or more.

In this case, since the inner diameter of the large-diameter cylindrical portion is 130 mm or more, it is possible to add the effect of gravity to the drainage introduced from the other side branch pipe connecting portion and to direct the drainage downward. .
Further, since the inner diameter is 130 mm or more, it is possible to prevent an increase in the bending rate of the bending tube portion. As a result, enlargement of the curved tube portion can be prevented, and the degree of freedom of arrangement of the drainage pipe joint can be increased.

(5)
Moreover, the lower part of a cylindrical trunk | drum has a taper-shaped part gradually diameter-reduced toward the downward direction, and a turning blade | wing may be provided in a taper-shaped part.

  In the drainage pipe joint, the lower portion of the cylindrical body portion is formed of a tapered portion, and a swirl vane is provided on the tapered portion.

  In this case, the drainage fluid velocity can be increased by the tapered portion that is swirled in the lower portion of the cylindrical body portion of the drainage pipe joint and gradually decreases in diameter downward. As a result, a suction effect (venturi effect) can be generated below the cylindrical body, and solid matter (dirt) in the waste water can be reliably flowed.

(6)
In addition, the curved cylindrical portion is arranged so that the horizontal maximum diameter of the second introduction port is larger than the horizontal maximum inner diameter at the position corresponding to the end of the horizontal branch pipe to be connected of the other horizontal branch pipe connecting portion. The inner diameter may gradually increase from the end-corresponding position toward the second introduction port.

  The curved cylindrical portion of the drainage pipe joint gradually increases in inner diameter in the horizontal direction from the position corresponding to the end of the side branch pipe when the side branch pipe is connected to the second introduction port.

In this case, since the capacity | capacitance in the curved cylinder part used as the flow path of waste_water | drain becomes large, the water depth of the waste_water | drain in a curved cylinder part can be made low. By reducing the water depth of the waste water, it is possible to more effectively suppress the waste water from jumping into the first introduction port.
Further, the flow rate of the drainage can be reduced simultaneously by reducing the depth of the drainage. Therefore, by reducing the flow rate of the drainage with the depth of the drainage lowered, the drainage jumping into the first inlet is more effective.

(7)
In addition, the maximum horizontal diameter of the second inlet may be present below the center point of the second inlet.

  The drainage in the curved cylindrical portion usually proceeds in a semi-pipe flow (that is, a flow rate at which the water depth is about half of the channel inner diameter in the vertical direction). For this reason, by forming the second introduction port and the curved cylinder so that the maximum horizontal diameter of the second introduction port exists below the center point of the second introduction port, the half pipe with respect to the total flow path capacity A larger capacity can be secured as the capacity of the flow. For this reason, the depth and flow velocity of drainage can be further reduced, and the jumping of drainage into the first inlet can be more effectively suppressed.

(8)
Further, the upper inner wall surface of the curved cylindrical portion may be inclined or curved downward toward the cylindrical body portion.

  In this case, since the flow direction of the inflowing wastewater is guided downward by the upper inner wall surface, the jumping of the wastewater into the first introduction port can be further effectively suppressed.

(9)
In addition, the ratio of the length from the upper end of the inner diameter to the lower end of the upper inner wall surface of the curved cylindrical portion with respect to the maximum inner diameter in the vertical direction at the position corresponding to the end of the side branch pipe to be connected of the other side branch pipe connection portion is 1/3 or more and 2/3 or less.

  In this case, since the flow direction of the inflowing wastewater is guided downward by the upper inner wall surface, the jumping of the wastewater into the first introduction port can be further effectively suppressed.

  According to the present invention, there is provided a drainage pipe joint that prevents drainage introduced from the second introduction port of another side branch pipe connection part from entering the first introduction port of one side branch pipe connection part. be able to.

It is a figure which shows an example of the piping system in the building which has several floors, such as an apartment. It is a typical front view showing an example of the drain pipe joint concerning this embodiment. It is a left view which has a typical partially notched cross section which shows an example of the drain pipe joint which concerns on this Embodiment. It is a right view which has a typical partially notched cross section which shows an example of the drain pipe joint which concerns on this Embodiment. It is a schematic diagram which shows an example of the AA line cross section of the drain pipe joint which concerns on this Embodiment of FIG. It is a schematic diagram which shows the left upper surface of the drain pipe joint which concerns on this Embodiment. It is a schematic diagram which shows the right upper surface of the drain pipe joint which concerns on this Embodiment. It is a typical enlarged view for demonstrating the detail of the curved cylinder part shown in FIG. It is the BB sectional view and CC sectional view of FIG. FIG. 6 is a schematic cross-sectional view in which a part of FIG. 5 is enlarged. FIG. 6 is a schematic cross-sectional view in which a part of FIG. 5 is enlarged. It is typical sectional drawing which shows the other example of the drain pipe joint of FIG. It is typical sectional drawing which shows the other example of the drain pipe joint of FIG. 9, and is the BB line cross section and DD line cross section of FIG. It is typical sectional drawing which shows the further another example of the drain pipe joint of FIG. It is a typical enlarged view for demonstrating the detail of the curved cylinder part in the further another example of the drainage pipe coupling of FIG. The back view of the drain pipe joint of Drawing 15 is shown. It is typical sectional drawing which shows the further another example of the drain pipe joint of FIG. 1 is a schematic diagram showing an example of a piping system using a drain pipe joint of Example 1. FIG. 6 is a schematic diagram illustrating an example of a drainage pipe joint of Comparative Example 1. FIG. 6 is a schematic diagram illustrating an example of a drainage pipe joint of Comparative Example 2. FIG.

[First Embodiment]
Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the following description, the same parts are denoted by the same reference numerals. Moreover, in the case of the same code | symbol, those names and functions are also the same. Therefore, detailed description thereof will not be repeated.

  Moreover, in the construction water supply and drainage industry, drainage from a water supply system such as a bathroom or bath may be referred to as “miscellaneous drainage”, and drainage from the toilet system may be referred to as “sewage”. In the embodiment, the “drainage” includes both the “miscellaneous drainage” and the “sewage”. Further, the “drainage” may include “rainwater”.

(First embodiment)
First, the state where the drainage pipe joint 100 according to the present embodiment is used will be described. FIG. 1 is a diagram illustrating an example of a piping system 500 in a building having a plurality of floors such as an apartment.

(Piping system)
As shown in FIG. 1, a piping system 500 includes a drainage pipe joint 100, a side branch pipe 200 for a toilet, a toilet 250, a side branch pipe 300 for a plumbing instrument, a plumbing instrument 350, and a drainage vertical pipe 400. Including.

  A piping system 500 in FIG. 1 is an example of a piping system on a floor slab, and illustrates the first floor to the third floor of an apartment. For example, the drainage pipe joint 100, the toilet branch side pipe 200, the toilet bowl 250, the plumbing pipe 300 for plumbing fixtures, and the plumbing fixture 350 are arranged for each room.

As shown in FIG. 1, a side branch pipe 200 for a toilet and a side branch pipe 300 for a plumbing fixture are connected to the side of the drain pipe joint 100. Are connected to drainage vertical pipes 400 respectively.
Therefore, the waste water from the toilet bowl 250 flows to the drain pipe joint 100 through the toilet branch side pipe 200, and the drainage from the plumbing fixture 350 passes through the plumb pipe 300 for plumbing equipment. It flows into the drainage pipe joint 100.
That is, in the piping system 500 of FIG. 1, the drainage pipe joint 100 has a role of collecting drainage of each room, and the drainage vertical pipe 400 has a role of flowing the drainage collected by the drainage pipe joint 100 further downstream. .

(Drainage pipe joint)
Next, details of the drainage pipe joint 100 will be described. 2 to 7 are schematic views showing an example of the drainage pipe joint 100 according to the present embodiment. The drainage pipe joint 100 is made of a resin such as cast iron or hard vinyl chloride, hard vinyl chloride coated with mortar, or the like.

  2 shows the front surface of the drainage pipe joint 100, FIG. 3 shows the left side surface having a partially cutaway section of the drainage pipe joint 100, and FIG. 4 shows the right side face of the drainage pipe joint 100 having a partially cutaway section. 5 shows a cross section taken along line AA of FIG. 3, FIG. 6 shows a left upper surface, and FIG. 7 shows a right upper surface.

(Cylindrical torso)
As shown in FIGS. 2 to 7, the drainage pipe joint 100 includes a tubular body 110 made of a tubular shape that extends in the vertical direction while being attached to the drainage vertical pipe 400.
The cylindrical body part 110 has a body part 111 having a large diameter on the upper side, and a tapered part 112 that reduces the diameter on the lower side. The tapered portion 112 has swirl vanes 160 and 170 on the inner wall 114.

Further, the drainage pipe joint 100 has the upper connection part 120 of the drainage vertical pipe 400 at the upper end of the cylindrical body part 110, and the lower connection part 130 of the drainage vertical pipe 400 at the lower end of the cylindrical body part 110.
Further, on both side walls inside the body portion 111 of the tubular body portion 110 of the drainage pipe joint 100, a side branch pipe connection portion 140 connected to the side branch pipe 300 for the plumbing fixture and a side branch pipe for the toilet. The horizontal branch pipe connecting portions 150 connected to the 200 are connected in series.
In addition, the horizontal branch pipe 300 for plumbing equipment and the horizontal branch pipe 200 for the toilet are connected to the drain pipe joint 100 at substantially the same height. That is, the pipe bottoms of the horizontal branch pipes 200 and 300 are connected to the floor slab at substantially the same height. Specifically, in order to ensure the gradient of the horizontal branch pipes 200 and 300, the horizontal branch pipes 200 and 300 are piped as close as possible to the floor slab near the drainage pipe joint 100. Accordingly, the axial center height of the lateral branch pipes 200 and 300 is preferably smaller (smaller) because it is closer (lower) to the floor slab. Moreover, in the drainage pipe joint 100 according to the present embodiment, the side branch pipe connection part 140 and the side branch pipe connection part 150 are formed in a straight line in plan view. The details of the side branch pipe connection part 140 and the side branch pipe connection part 150 will be described later.

(Connection between drainage pipe joint and drainage vertical pipe)
In the upper connection part 120, the end of the drainage vertical pipe 400 is supported by contacting the upper support part 121 through packing or the like. Further, by inserting rubber packing or the like between the outer periphery of the drainage vertical pipe 400 and the inner periphery of the upper connection part 120, the drainage vertical pipe 400 and the upper connection part 120 are fitted in a watertight manner.

  Similarly, in the lower connection part 130, the end part of the drainage vertical pipe 400 abuts and is supported by the lower support part 131 via packing or the like. Further, the drainage vertical pipe 400 and the lower connection part 130 are watertightly connected by screwing the flanges with a rubber packing or the like interposed between the outer periphery of the drainage vertical pipe 400 and the inner periphery of the lower connection part 130. The

(Horizontal branch pipe connection for water appliances)
As shown in FIG. 2 to FIG. 7, the lateral branch pipe connecting portion 140 has a shape in which the lateral branch pipe 300 for a watering device can be connected in the horizontal direction.
For example, in the side branch pipe connecting portion 140, the end portion of the side branch pipe 300 for the plumbing fixture is in contact with and supported by the support portion 141. In addition, by inserting a rubber packing or the like between the outer periphery of the side branch pipe 300 and the inner circumference of the side branch pipe connecting portion 140 and screwing the flanges together, the side branch pipe 300 and the side branch pipe connecting portion 140 are connected. Connected watertight.
Moreover, the waste water from the horizontal branch pipe 300 for the plumbing apparatus flows in the horizontal direction into the body part 111 of the cylindrical body part 110 while maintaining a horizontal momentum.

Here, at the boundary where the lateral branch pipe connecting portion 140 communicates with the trunk portion 111 of the cylindrical trunk portion 110, an introduction port 145 through which the drainage from the lateral branch pipe 300 for the plumbing apparatus flows into the trunk portion 111 is provided. Arranged. The introduction port 145 has a lower end 145D and an upper end 145U.
In particular, since the lower end 145D of the introduction port 145 is formed in the horizontal direction in the left sectional view, the drainage from the side branch pipe 300 flows into the body portion 111 in the substantially horizontal direction while maintaining the inertial force.
Similarly, the upper end 145U of the introduction port 145 is also formed in the horizontal direction in the left sectional view. However, the upper end 145U of the introduction port 145 is not limited to this aspect, and may be formed in any other direction or at an arbitrary angle in the left cross-sectional view.

(Horizontal branch pipe connection for toilet bowl piping)
Next, as shown in FIGS. 2 to 7, the side branch pipe connection portion 150 for the toilet pipe is connected to the side branch pipe connection port 155 and the body of the cylindrical trunk portion 110 connected to the side branch pipe 200 for the toilet bowl. A curved cylindrical portion 156 communicating with the portion 111.

  At the side branch pipe connection port 155, the end of the side branch pipe 200 for the toilet is brought into contact with and supported by the support portion 151. That is, the position of the support portion 151 corresponds to the position of the end of the horizontal branch pipe 200 when the horizontal branch pipe 200 is connected. Furthermore, by inserting a rubber packing between the outer periphery of the side branch pipe 200 for the toilet and the inner periphery of the side pipe connection port 155, the flanges are screwed to each other. The side branch pipe connection port 155 is watertightly connected.

  Further, the curved cylindrical portion 156 of the side branch pipe connecting portion 150 for toilet bowl piping has a lower curved inner wall 156D that curves downward toward the cylindrical trunk portion 110, and further, the trunk portion of the cylindrical trunk portion 110. An introduction port 157 is disposed at a boundary communicating with 111. Hereinafter, the curved cylindrical portion 156 and the introduction port 157 will be described in detail.

(Curved tube and inlet)
FIG. 8 is a schematic enlarged view for explaining the details of the curved cylindrical portion 156 shown in FIG. Furthermore, FIG. 9 shows the BB line cross section and CC line cross section of FIG.

  As shown in FIG. 8, an upper surface 157 </ b> U is formed at the upper portion of the introduction port 157, and a lower curved surface 157 </ b> D is formed at the lower portion of the introduction port 157. The lower curved surface 157D is curved so as to protrude toward the axial center side of the introduction port 157 in the right sectional view. Further, the curved cylindrical portion 156 has an upper inner wall 156U and a lower curved inner wall 156D. The lower curved inner wall 156D is curved so as to protrude toward the curved axis VLC in the right sectional view. The upper surface 157U of the introduction port 157 forms a part of the upper inner wall 156U of the curved cylinder portion 156, and the lower curved surface 157D of the introduction port 157 forms a part of the lower curved inner wall 156D of the curved cylinder portion 156.

In the present embodiment, the curved cylindrical portion 156 is formed so that the virtual tangent VLDT of the lower curved surface 157D at the introduction port 157 passes below the lower end 145D of the introduction port 145 of the lateral branch pipe connection portion 140. Has been.
Here, as described above, the introduction port 157 is a portion arranged at the boundary communicating with the body portion 111 of the tubular body portion 110 of the curved tube portion 156. Therefore, the imaginary tangent VLDT of the lower curved surface 157D means that the lower curved surface 157D has an inner wall surface and a lower curved surface 157D of the lower curved surface 157D that are the positions of the final end of the curved cylindrical portion 156, that is, the most downstream end. Is a virtual tangent at the intersection OD.

  Moreover, it is preferable that the average of the curvature radius of lower curved surface 157D shown in FIG. 8 exists in the range of R30 mm or more and R70 mm or less.

Note that, as shown in the present embodiment, the curved cylinder so that the virtual tangent VLCT of the curved axis VLC of the curved cylinder part 156 passes below the lower end 145D of the inlet 145 of the lateral branch pipe connection part 140. It is preferable that the part 156 is formed.
Here, the virtual tangent VLCT of the curved axis VLC refers to the introduction port 157 and the body portion 111 including the upper surface 157U and the lower curved surface 157D at the position of the final end, that is, the most downstream end of the curved cylindrical portion 156 in the right sectional view. This is a virtual tangent at the center point O of a closed curve (a curve including the intersecting ridge OD) intersecting with the inner wall surface.

  Moreover, it is preferable that the average of the curvature radii of the curved axis VLC of the curved cylindrical portion 156 shown in FIG. 8 is in the range of R75 mm to R250 mm.

In FIG. 9, the cross section taken along line BB corresponds to the support portion 151, the upper end of the inner periphery thereof corresponds to the upper end 151 U of the support portion 151, and the lower end corresponds to the lower end 151 D of the support portion 151. The inner periphery of the CC cross section corresponds to the introduction port 157, the upper end of the inner periphery corresponds to one point on the upper surface 157U of the introduction port 157, and the lower end corresponds to one point on the lower curved surface 157D of the introduction port 157.
Since the lower curved inner wall 156D of the curved cylindrical portion 156 is curved as described above, the lower end of the lower curved surface 157D of the inlet 157 is lower than the lower end 151D of the support portion 151 as shown in FIG. To position.

  In the present embodiment, as shown in FIG. 8, both the virtual tangent VLDT and the virtual tangent VLCT are curved so as to pass below the lower end 145D of the inlet 145 of the lateral branch pipe connecting portion 140. The case where the cylinder part 156 is formed was demonstrated. However, the present invention is not limited to this mode, and the curved cylindrical portion 156 may be formed so that only the virtual tangent VLDT passes below the lower end 145D of the introduction port 145 of the lateral branch pipe connecting portion 140. That is, it is an essential condition that the curved cylindrical portion 156 is formed so that at least the virtual tangent VLDT passes below the lower end 145D of the inlet 145 of the lateral branch pipe connecting portion 140.

  Subsequently, the inner diameter L1 of the body 111 of the cylindrical body 110 shown in FIG. 8 is 140 millimeters. In addition, although mentioned later in an Example, it is preferable that the internal diameter L1 is 130 millimeters or more.

(Swirl blade)
Next, the swirl vanes 160 and 170 in the tapered portion 112 will be described. 10 and 11 are schematic cross-sectional views in which a part of FIG. 5 is enlarged. In the present embodiment, two swirl vanes 160 and 170 are provided.

The swirl vane 160 shown in FIGS. 3, 10, and 11 is directed from the inner wall 114 of the tapered portion 112 slightly below the position where the side branch pipe connection portion 140 is formed toward the lower side of the side branch pipe connection portion 150. Projected.
Further, the swirl vane 170 shown in FIGS. 4, 10 and 11 extends from the inner wall 114 of the tapered portion 112 slightly below the position where the lateral branch pipe connecting portion 150 is formed to the lower side on the side branch pipe connecting portion 140 side. Projected toward.

The swirl vanes 160 and 170 swirl the drainage flowing downward, whereby a ventilation space is formed in the central portion (axial center) of the drainage flowing through the drainage vertical pipe 400. Thereby, the pressure fluctuation in the drainage vertical pipe 400 can be suppressed, and the fall of drainage performance can be prevented.
Further, the drainage fluid velocity of the drainage can be increased by the tapered portion 112 in which the drainage in the lower portion of the cylindrical body 110 of the drainage pipe joint 100 is swirled and gradually decreases in diameter downward. As a result, a suction effect (venturi effect) can be generated below the cylindrical body 110, and solid matter (dirt) in the drainage can be surely flowed.

  Further, in the present embodiment, the projected inner cross-sectional area S1 (hatching portion) of the inner wall 113 of the body portion 111 of the cylindrical body portion 110 shown in FIG. 10, and the cylindrical body portion 110 of the swirl vane 160 shown in FIG. Projection area S2 (hatching part) of the part that enters inside the projection internal cross-sectional area S1 of the body part 111, projection area of the part that enters inside the projection internal cross-sectional area S1 of the body part 111 of the cylindrical body part 110 of the swirl vane 160 In the case of S3 (hatching portion), 0.2 × S1 ≦ S2 ≦ 0.3 × S1, S3 ≦ 0.05 × S1, 0.001 × S1 ≦ S3 ≦ 0.05 × S1, and (S2 + S3) The swirl vanes 160 and 170 are projected so as to satisfy the four conditions of ≦ 0.3 × S1.

  Also, as shown in FIG. 11, the midpoint T1 of the line connecting the upper end and the lower end of the swirl vane 160, the midpoint T2 of the line connecting the upper end and the lower end of the swirl vane 170, and the cylindrical body 110 The swirl vanes 160 and 170 are projected so that an angle θ1 formed by the axis C of the shaft is 180 degrees or more and 210 degrees or less.

  Further, the inclination angle θ2 (see FIG. 3) of the swirl vane 160 is preferably set at 20 degrees or more and 45 degrees or less, and the inclination angle θ3 (see FIG. 4) of the swirl vane 170 is 15 degrees or more and 40 degrees or less. It is preferable to be provided.

[Other examples]
12 to 17 show other examples of the first embodiment of the present invention. In other examples, differences from the first embodiment will be mainly described, and descriptions of the same points will be omitted.

[Drainage pipe joint 100a]
FIG. 12 is a schematic cross-sectional view of a drainage pipe joint 100a which is another example of the drainage pipe joint 100 in the first embodiment, and is a schematic cross-sectional view corresponding to FIG. Furthermore, FIG. 13 shows the BB line cross section and DD line cross section in FIG. The cross section taken along the line B-B corresponds to the support portion 151, the upper end of the inner periphery thereof corresponds to the upper end 151 </ b> U of the support portion 151, and the lower end corresponds to the lower end 151 </ b> D of the support portion 151. The inner periphery of the DD line section corresponds to the introduction port 157a, the upper end of the inner periphery corresponds to one point on the upper surface 157Ua of the introduction port 157a, and the lower end corresponds to one point on the lower curved surface 157Da of the introduction port 157a.

  As shown in FIG. 12, the horizontal branch pipe connection part 150a of the drain pipe joint 100a has a curved cylinder part 156a in which the horizontal maximum inner diameter gradually increases from the support part 151 toward the introduction port 157a. As a result, as shown in FIG. 13, the maximum inner diameter in the DD line cross section, that is, the horizontal maximum diameter in the introduction port 157a, is larger than the maximum inner diameter in the BB line section, that is, the horizontal maximum inner diameter of the support portion 151. Becomes larger. That is, as shown in FIG. 13, the inner periphery of the DD line section has a circular shape having a larger diameter than the inner periphery of the CC line section.

[Drainage pipe joint 100b]
14 is a schematic cross-sectional view of a drainage pipe joint 100b, which is another example of the drainage pipe joint 100 in the first embodiment, and is a schematic cross-sectional view corresponding to FIG. is there. The cross section including the support portion 151 in FIG. 14 corresponds to the cross section along line BB in FIG. 9, and the cross section including the introduction port 157b in FIG. 14 corresponds to the cross section along line CC in FIG. In the cross section including the support portion 151, the upper end of the inner periphery corresponds to the upper end 151 </ b> U of the support portion 151, and the lower end corresponds to the lower end 151 </ b> D of the support portion 151. In the cross section including the introduction port 157b, the inner circumference corresponds to the introduction port 157b, the upper end of the inner circumference corresponds to one point on the upper surface 157Ub of the introduction port 157b, and the lower end corresponds to one point on the lower curved surface 157Db of the introduction port 157b. .

  The drainage pipe joint 100b has a curved cylindrical portion 156b (not shown) whose maximum inner diameter in the horizontal direction is temporarily increased from the support portion 151 toward the introduction port 157b. As a result, as shown in FIG. 14, the horizontal maximum inner diameter in the cross section including the introduction port 157b is larger than the horizontal maximum inner diameter in the cross section including the support portion 151. Further, the maximum horizontal inner diameter in the cross section including the introduction port 157b exists below the center (center of gravity) of the introduction port 157b. As a result, as shown in FIG. 14, the inner periphery of the cross section of the inlet 157b has a shape in which the horizontal width gradually increases from the upper end of the upper surface 157Ub to the maximum inner diameter.

[Drainage pipe joint 100c]
FIG. 15 is a schematic enlarged view for explaining details of a curved cylindrical portion of a drainage pipe joint 100c which is another example of the drainage pipe joint 100 in the first embodiment. FIG. 15 corresponds to FIG. 8 showing a schematic enlarged view of the drainage pipe joint 100. FIG. 16 shows a rear view of the vicinity of the lateral branch pipe connecting portion 150c of the drainage pipe joint 100c.

  As shown in FIG. 15, the drainage pipe joint 100c has a side branch pipe connection part 150c. The lateral branch pipe connecting part 150c has a curved cylinder part 156c that curves downward toward the cylindrical body part 110. An introduction port 157c (not shown) is disposed at the boundary between the cylindrical body portion 110 and the curved cylinder portion 156c of the lateral branch pipe connecting portion 150c.

  As shown in FIG. 15, an upper surface 157Uc is formed in the upper part of the introduction port 157c, and a lower curved surface 157D is formed in the lower part of the introduction port 157c. Further, the curved cylindrical portion 156c has an upper inner wall 156Uc and a lower curved inner wall 156D. The upper surface 157Uc of the introduction port 157c forms part of the upper inner wall 156Uc of the curved tube portion 156c.

  Further, the curved cylindrical portion 156c is formed so that the virtual tangent VLDT of the lower curved surface 157D at the inlet 157c passes below the lower end 145D of the inlet 145 of the lateral branch pipe connecting portion 140.

Further, the curved cylindrical portion 156c is formed so that the virtual tangent line VLUTc of the upper surface 157Uc at the introduction port 157c passes below the lower end 145D of the introduction port 145 of the lateral branch pipe connection portion 140.
Here, the introduction port 157c is a portion arranged at a boundary communicating with the body portion 111 of the curved cylinder portion 156c. Therefore, the virtual tangent VLUTc of the upper surface 157Uc is the portion of the curved cylinder portion 156c of the upper surface 157Uc. This is a virtual tangent at the intersection OUc between the inner wall surface of the body portion 111 and the upper surface 157Uc, which is the position of the final end, that is, the most downstream end.

  The upper inner wall 156Uc may be inclined such that the upper surface 157Uc of the introduction port 157c is on the lower side than the upper end 151U of the support portion 151 in the right sectional view, or the curved axis VLCc of the curved cylindrical portion 156c. It may be curved so as to be convex on the opposite side. When the upper inner wall 156Uc is curved, the average radius of curvature is preferably in the range of R70 mm to R140 mm.

Since the upper inner wall 156Uc has the shape as described above, the curved cylindrical portion 156c has a virtual tangent VLCTc of the curved axis VLCc positioned below the virtual tangent VLCT of the curved cylindrical portion 156 in the drainage pipe joint 100. Is formed. Accordingly, it is possible to more efficiently prevent waste water from the introduction port 157c from entering the horizontal branch pipe 300 (see FIG. 1) from the introduction port 145.
Here, the virtual tangent VLCTc of the curved axis VLCc intersects the inlet 157c including the upper surface 157Uc and the lower curved surface 157D at the position of the final end of the curved cylindrical portion 156c, that is, the most downstream end, and the inner wall surface of the body portion 111. This is a virtual tangent at the center point Oc of the closed curve (curve passing through the intersection ODs, OUc).

  Since the upper inner wall 156Uc has the above-mentioned shape, as shown in FIG. 16, the upper inner wall 156Uc blocks the projection of the support portion 151 when the support portion 151 is projected from the back to the front. Provided. The ratio of the distance between the upper end 151U of the support portion 151 and the intersecting ridge OUc, which is the most downstream end of the upper inner wall 156Uc, with respect to the vertical diameter of the support portion 151 may be 1/3 or more and 2/3 or less. preferable.

  In FIG. 15, the virtual tangent VLUT on the upper surface 157Uc is formed so as to pass below the lower end 145D of the introduction port 145 of the side branch pipe connection portion 140. However, the virtual tangent VLUT is connected to the side branch pipe connection. You may form so that it may pass between the upper end 145U and the lower end 145D of the inlet 145 of the part 140. FIG.

[Drainage pipe joint 100d]
FIG. 17 is a schematic cross-sectional view of a drainage pipe joint 100d which is another example of the drainage pipe joint 100 in the first embodiment, and is a schematic cross-sectional view corresponding to FIG. is there. The cross section including the support portion 151 in FIG. 17 corresponds to the cross section along the line BB in FIG. 9, and the cross section including the introduction port 157d in FIG. 17 corresponds to the cross section along the line CC in FIG. In the cross section including the support portion 151, the upper end of the inner periphery corresponds to the upper end 151U of the support portion 151, and the lower end corresponds to the lower end 151D of the support portion 151. In the cross section including the introduction port 157d, the inner circumference corresponds to the introduction port 157d, the upper end of the inner circumference corresponds to one point of the upper surface 157Ud of the introduction port 157d, and the lower end corresponds to one point of the lower curved surface 157Dd of the introduction port 157d. .

The drainage pipe joint 100d has a curved cylinder part 156d (not shown) whose maximum inner diameter in the horizontal direction is temporarily increased from the support part 151 toward the introduction port 157d (the curved cylinder part in the drainage pipe joint 100a shown in FIG. 12). 156a).
Further, the upper inner wall 156Ud (not shown) of the curved cylindrical portion 156d (not shown) is inclined or curved (similar to the upper inner wall 156Uc of the curved cylindrical portion 156c in the drain pipe joint 100c shown in FIG. 15). .

  As a result, as shown in FIG. 17, the inner periphery of the cross section including the introduction port 157d has an elliptical shape having a major axis in the horizontal direction and a minor axis in the vertical direction, and the major axis length is the horizontal of the support portion 151. It has an elliptical shape that is larger than the maximum inner diameter in the direction and whose minor axis length is smaller than the maximum inner diameter in the vertical direction of the support portion 151. Furthermore, the intersection of the major axis and the minor axis of the ellipse is located below the center of the support portion 151.

  In the above-described exemplary embodiment, the lateral branch pipe connecting portions 140 and 150 are arranged in a straight line (180 degrees) when viewed in plan from above. And may be arranged to form an obtuse angle.

  In the above-described exemplary embodiment, two side branch pipe connection portions 140 and 150 are arranged. However, one side branch pipe connection portion 150 and an arbitrary number of side branch pipe connection portions 140 may be provided. Good. For example, when one side branch pipe connection part 150 and two side branch pipe connection parts 140 are provided, one side branch pipe connection part 140 has an angle of 120 degrees with the side branch pipe connection part 150 in plan view. Furthermore, the other side branch pipe connection part 140 is formed so as to form an angle of 120 degrees with one side branch pipe connection part 140 in a plan view, that is, the side branch pipe connection part 150, The horizontal branch pipe connection portions 140 and 150 may be provided so that the three axes of the horizontal branch pipe connection portions 140 equally divide 360 degrees.

  Furthermore, the swirl vanes 160 and 170 are projected in total of two, but the present invention is not limited to this, and the swirl vanes 160 and 170 may be a total of three, four, or four or more arbitrary numbers. The swirl blades 160 and 170 may not be provided at all.

  Further, in the above-described exemplary embodiment, as a cross-sectional shape including the introduction port, the drainage pipe joint 100 has an elliptical shape having a short axis in the horizontal direction (see FIG. 9), and the drainage pipe joint 100a has a circular shape (see FIG. 13). The drainage pipe joint 100b has an upright triangular shape with rounded vertices (see FIG. 14), and the drainage pipe joint 100d has an elliptical shape with a long axis in the horizontal direction, but is not limited to these shapes. For example, it may be an erecting rectangle (for example, an erecting rectangle and an erecting square having long sides in the horizontal direction) with all the vertices rounded.

  Hereinafter, the experiment was conducted using the drain pipe joint of the present invention and the drain pipe joint as a comparative example.

Example 1
FIG. 18 is a schematic diagram illustrating an example of the first embodiment. a) shows a plan view of the experimental system as viewed from above, and b) shows a horizontal front view of the experimental system. As the drainage pipe joint in Example 1, the drainage pipe joint 100 described in the embodiment was used. A side branch pipe 200 for a toilet was connected to the side branch pipe connection part 150, and a side branch pipe 300 for a plumbing fixture was connected to the side branch pipe connection part 140.

  The horizontal length L20 of the horizontal branch pipe 200 for the toilet bowl is 1000 millimeters, and the height direction length H20 is 160 millimeters. The maximum flow rate Qmax from the toilet 250 was 2.6 liters per second. The horizontal length L30 of the horizontal branch pipe 300 for the water supply device at the horizontal branch pipe connecting portion 140 was 600 millimeters.

(Example 2)
In the second embodiment, instead of the drainage pipe joint 100 having the inner diameter L1 of the body part 111 of the drainage pipe joint 100 of 140 mm, the drainage pipe joint 101 having the inner diameter L1 of the body part 111 of the drainage pipe joint 100 of 130 mm is used. It was. Other conditions are the same as in the first embodiment.

(Example 3)
In the third embodiment, instead of the drainage pipe joint 100 having the inner diameter L1 of the body part 111 of the drainage pipe joint 100 of 140 mm, the drainage pipe joint 102 having the inner diameter L1 of the body part 111 of the drainage pipe joint 100 of 120 mm is used. It was. Other conditions are the same as in the first embodiment.

(Comparative Example 1)
In Comparative Example 1, as shown in FIG. 19, a drainage pipe joint 900 provided with a side branch pipe connection part 140 was used instead of the side branch pipe connection part 150 of the drainage pipe joint 100. That is, the drainage pipe joint 900 provided with two side branch pipe connection parts 140 was used. The lateral branch pipe connecting portion 140 in the comparative example 1 has an upper end 145U and a lower end 145D of the introduction port 145. Other conditions are the same as in the first embodiment.

(Comparative Example 2)
In Comparative Example 2, as shown in FIG. 20, a drainage pipe joint 901 provided with a side branch pipe connection part 150 is used instead of the side branch pipe connection part 140 of the drainage pipe joint 100. That is, the drainage pipe joint 901 provided with two side branch pipe connection parts 150 was used. In the lateral branch pipe connecting part 150 in the comparative example 2, a curved cylinder part 156 is formed. Other conditions are the same as in the first embodiment.

(Comparative Example 3)
In the third comparative example, the horizontal branch pipe 300 for the plumbing fixture is connected to the horizontal branch pipe connecting portion 150 of the drainage pipe joint 100 in the first embodiment, and the side branch pipe 200 for the toilet is connected to the horizontal branch pipe connecting portion 140. Connected. That is, the connection of the lateral branch pipe connecting portions 140 and 150 in the first embodiment is switched.

Hereinafter, using the drainage pipe joints in Examples 1 to 3 and Comparative Examples 1 to 3, the wastewater was allowed to flow from the toilet 250, and the amount of protrusion that entered the side branch pipe 300 side for the plumbing fixture was measured.

  As shown in Table 1, in Examples 1 to 3, compared with Comparative Examples 1 to 3, it was possible to reduce the rush (the amount of protrusion) to the side branch pipe 300 side for the water supply device. In particular, in Example 1 or 2, the amount of protrusion could be reliably prevented. The drainage performance was 6.5 liters per second and 5.5 liters per second, respectively, which proved to be sufficient for practical use.

  Furthermore, from comparison between Examples 1 and 2 and Example 3, it was found that the inner diameter L1 of the body part 111 of the cylindrical body part 110 is preferably 130 millimeters or more.

  In addition, it was found from the results of Comparative Example 1 to Comparative Example 3 that it was not possible to effectively prevent the rush (jump amount) to the side branch pipe 300 side for the watering device.

Example 4
In Example 4, instead of the drainage pipe joint 100 in which the inner diameter L1 of the body part 111 is 140 millimeters, the drainage pipe joint 100b in which the inner diameter L1 of the body part 111 is 140 millimeters was used. Other conditions are the same as in the first embodiment.

(Example 5)
In Example 5, instead of the drainage pipe joint 100 having the inner diameter L1 of the body part 111 of 140 millimeters, the drainage pipe joint 101b having the inner diameter L1 of the body part 111 of 130 millimeters was used. Other conditions are the same as in the first embodiment.

  As shown in Table 2, in Examples 4 and 5, it was possible to reliably prevent the entry (the amount of jumping out) to the side branch pipe 300 side for the plumbing equipment. The drainage performance was 6.5 liters per second and 5.5 liters per second, respectively, which proved to be sufficient for practical use.

  As described above, in the drainage pipe joint 100 according to the present invention, the side branch pipe connection part 140 connected to the side branch pipe 300 for the watering device is provided in the horizontal direction. The wastewater introduced from the 140 inlet 145 flows in the horizontal direction due to the inertial force of the wastewater.

  On the other hand, the virtual tangent of the lower curved surface 157D of the introduction port 157 of the side branch pipe connection portion 150 connected to the side branch pipe 200 for the toilet is located below the lower end 145D of the introduction port 145 of the side branch pipe connection portion 140. Since it is provided so as to pass through, the drainage introduced from the inlet 157 of the lateral branch pipe connecting portion 150 flows along the lower curved surface 157D.

  As a result, it is possible to prevent drainage introduced from the introduction port 157 of the side branch pipe connection part 150 from entering the introduction port 145 of the side branch pipe connection part 140.

  In addition, since most of the drainage from the inlet 157 of the side branch pipe connecting portion 150 can be directed downward from the lower end 145D of the inlet 145 of the side branch pipe connecting portion 140, to the side branch pipe connecting portion 140. Intrusion of solid matter (dirt) or accumulation of solid matter (dirt) can be prevented.

In particular, the drainage may contain not only fluid but also solid matter (dirt). When the water flow is large, the drainage flows into the tubular body 110 by inertia force from the side branch pipe 200 for the toilet, but it is inclined downward by the curved cylinder part 156 of the side branch pipe connection part 150. It flows in the direction.
Therefore, most of the drainage from the side branch pipe 200 for the toilet can be directed downward from the lower end 145D of the introduction port 145 of the side branch pipe connection part 140, and the introduction port 157 of the side branch pipe connection part 150 can be directed. It is possible to prevent the wastewater introduced from rushing into the introduction port 145 of the lateral branch pipe connecting portion 140.

  Further, since the inner diameter L1 of the body portion 111 including the inlets 145 and 157 of the side branch pipe connecting portions 140 and 150 is 130 mm or more, the effect of gravity is added to the drainage introduced from the side branch pipe connecting portion 150. The drainage can be directed downward.

  Moreover, since the internal diameter of the trunk | drum 111 consists of 130 millimeters or more, the increase in the curvature of the curved cylinder part 156 can be prevented. As a result, enlargement of the curved cylindrical portion 156 can be prevented, and the degree of freedom of arrangement of the drainage pipe joint 100 can be increased.

  Further, the drainage fluid velocity of the drainage can be increased by the inner wall 114 of the tapered portion 112 in which the drainage in the lower portion of the cylindrical body 110 of the drainage pipe joint 100 is swirled and gradually decreases in diameter downward. As a result, a suction effect (venturi effect) can be generated below the cylindrical body 110, and solid matter (dirt) in the drainage can be reliably flowed.

  In the present embodiment, the drainage vertical pipe 400 corresponds to a drainage pipe, the drainage pipe joints 100, 100a, to 100d correspond to drainage pipe joints, the cylindrical body 110 corresponds to a cylindrical body, The side branch pipe connection portion 140, the side branch pipe connection portions 150, 150a, and 150c correspond to the side branch pipe connection portion, the introduction port 145 corresponds to the first introduction port, and the introduction ports 157, 157a,. 2, the curved cylindrical portions 156, 156 a,..., 156 d correspond to curved cylindrical portions, and the virtual tangent VLDT of the lower curved surfaces 157 D, 157 Da, 157 Db, 157 Dd is the virtual of the lower curved surface of the second inlet port. It corresponds to the tangent, the lower end 145D of the introduction port 145 of the lateral branch pipe connecting portion 140 corresponds to the lower end of the first introduction port, and the virtual tangents VLCT and VLCTc of the bending axis VLC are curved of the curved cylindrical portion at the second introduction port Temporary axis Corresponding to the tangent line, the side branch pipe connection part 150 corresponds to another side branch pipe connection part, the side branch pipe 200 for the toilet is equivalent to a toilet drainage pipe, and the body part 111 is a cylindrical part having a large diameter. , The inner diameter L1 corresponds to the inner diameter, the tapered portion 112 corresponds to the tapered portion, the swirling blades 160 and 170 correspond to the swirling blades, and the position of the support portion 151 is to be connected. It corresponds to the position corresponding to the end of the tube, and the upper inner walls 156U, 156Uc, 156Ud correspond to the upper inner wall surface.

  A preferred embodiment of the present invention is as described above, but the present invention is not limited thereto. It will be understood that various other embodiments may be made without departing from the spirit and scope of the invention. Furthermore, in this embodiment, although the effect | action and effect by the structure of this invention are described, these effect | actions and effects are examples and do not limit this invention.

100, 100a, ..., 100d Drain pipe joint 110 Cylindrical body 111 Body part 112 Tapered part 140, 150, 150a, 150c Side branch pipe connection part 145 First introduction port 151 Support part 156, 156a, ..., 156d Curved cylinder Portions 156U, 156Uc, 156Ud Upper inner walls 157, 157a, ..., 157d Second inlet 157D, 157Da, 157Db, 157Dd Lower curved surface 160, 170 Swirling blade 200 Side branch pipe for toilet 400 Drainage vertical pipe L1 Inner diameter VLC Curve Axis center VLDT Virtual tangent VLCT, VLCTc Virtual tangent

Claims (9)

A drainage pipe joint connected to a drainage pipe arranged in the vertical direction,
A tubular body,
A plurality of side branch pipe connecting portions connected in series to connect the side branch pipes to two opposite sides of the side wall of the cylindrical body,
Horizontal branch pipe connecting portions on one of the plurality of lateral branch pipe connecting portion is communicated with the tube-shaped body portion by a first inlet disposed at a boundary between the tube-shaped body portion, said upper and lower in the direction of the cross section, the lower end of the inner wall of the lateral branch pipe connecting portion of the one is provided continuously such that the horizontal direction with respect to the tube-shaped body portion,
Other lateral branch pipe connecting portion of the plurality of lateral branch pipe connecting portion is communicated with the tube-shaped body portion by a second inlet disposed at a boundary between the tube-shaped body portion, and the cylindrical It has a curved cylinder part that curves downward toward the body part,
The curved cylindrical portion has an imaginary tangent at a cross ridge between the lower curved surface of the second introduction port and the inner wall surface of the cylindrical trunk portion of the lower curved inner wall of the curved cylindrical portion in the vertical sectional view. drainage fitting, characterized in that, formed so as to pass below the lower end of the first inlet of the lateral branch pipe connecting portion of the one. A drainage pipe joint connected to a drainage pipe arranged in the vertical direction,
A tubular body,
A plurality of side branch pipe connecting portions connected in series to connect the side branch pipes to two opposite sides of the side wall of the cylindrical body,
Horizontal branch pipe connecting portions on one of the plurality of lateral branch pipe connecting portion is communicated with the tube-shaped body portion by a first inlet disposed at a boundary between the tube-shaped body portion, said upper and lower in the direction of the cross section, the lower end of the inner wall of the lateral branch pipe connecting portion of the one is provided continuously such that the horizontal direction with respect to the tube-shaped body portion,
Other lateral branch pipe connecting portion of the plurality of lateral branch pipe connecting portion is communicated with the tube-shaped body portion by a second inlet disposed at a boundary between the tube-shaped body portion, and the cylindrical It has a curved cylinder part that curves downward toward the body part,
The curved cylindrical portion is a virtual tangent at a center point of a closed curve of the curved axial center of the curved cylindrical portion where the second introduction port and the inner wall surface of the cylindrical trunk portion intersect in the vertical sectional view. but drainage fitting, characterized in that, formed so as to pass below the lower end of the first inlet of the lateral branch pipe connecting portion of the one.   The drainage pipe joint according to claim 1 or 2, wherein the other side branch pipe connection portion is connected to a toilet drainage pipe. The cylindrical trunk portion has a cylindrical portion having a larger diameter than the drain pipe,
The large-diameter cylindrical portion includes at least the side branch pipe connecting portion communicating with the side branch pipe,
4. The drain pipe joint according to claim 1, wherein an inner diameter of the large-diameter cylindrical portion including both inlets of the side branch pipe connecting portion is 130 mm or more. 5. . The lower portion of the cylindrical body has a tapered portion that gradually decreases in diameter toward the lower side,
The drain pipe joint according to any one of claims 1 to 4, wherein a swirl vane is provided in the tapered portion.   The curved cylinder so that the horizontal maximum diameter of the second introduction port is larger than the horizontal maximum inner diameter at a position corresponding to the end of the horizontal branch pipe to be connected of the other horizontal branch pipe connecting portion. The drain pipe joint according to any one of claims 1 to 5, wherein the portion has an inner diameter that gradually expands from the position corresponding to the end toward the second introduction port.   The drainage pipe joint according to claim 6, wherein a maximum horizontal diameter of the second introduction port exists below a center point of the second introduction port.   The drainage pipe joint according to any one of claims 1 to 7, wherein an upper inner wall surface of the curved cylindrical portion is inclined or curved downward toward the cylindrical body portion.   The length from the upper end of the inner diameter to the lower end of the upper inner wall surface of the curved cylindrical portion with respect to the maximum inner diameter in the vertical direction at the position corresponding to the end of the side branch pipe to be connected of the other side branch pipe connecting portion. The drainage pipe joint according to claim 8, wherein the ratio is 1/3 or more and 2/3 or less.

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