JP2017166299A - Drainage system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To secure high drainage performance even when a drainage load of a building increases.SOLUTION: A drainage system of a building includes: a drain riser pipeline 1 for penetrating a floor slab 100; and a ventilation riser pipeline 2. The drain riser pipeline 1 includes: a collective joint 10 installed at a penetration port 101 of the floor slab 100; and a drain riser pipe 15 connected between these collective joints 10. At the collective joint 10, a drain horizontal branch pipe 16 is connected at an upper part of the floor slab 100, and drain water from drainage equipment 17a-17c flows down the drain riser pipeline 1 through the drain horizontal branch pipe 16. In the ventilation riser pipeline 2, an upper end is opened to the atmosphere and a lower end is connected to a lower end part of the drain riser pipeline 1. A middle part of the ventilation riser pipeline 2 is also connected to the collective joint 10 of the middle part of the drain riser pipeline 1 via a ventilation horizontal branch pipe 20.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a building drainage system.

  The drainage system of the building is provided with a drainage duct that penetrates the floor slab of each floor. The drainage stack has a collective joint installed at a through-hole of a floor slab on each floor, and a drainage stack connected between the collective joints. A drainage horizontal branch pipe extending along the floor slab is connected to the collective joint of each floor above or below the floor slab. Drainage from the drainage equipment is collected in a collecting joint through a drainage horizontal branch pipe, and flows down a drainage standing pipe and sent to a sewer or a sewage treatment tank.

In low-rise buildings, an extended vent pipe is connected to the upper end of the drainage stack. The extended vent pipe extends upward and is open to the atmosphere on the roof. By escaping air from the drainage standpipe through this extended vent pipe or replenishing air to the drainage standpipe, pressure fluctuations in the drainage standpipe are suppressed and drainage performance is maintained. ing.
However, since the drainage load increases when the building is high-rise, a drainage system in which only the above-mentioned extended vent pipe is connected cannot be used. For this reason, two-pipe drainage systems and single-pipe drainage systems using specially constructed collective joints have been developed.

  The two-pipe drainage system disclosed in Patent Document 1 includes a venting duct in addition to the drainage duct. The upper end of the ventilating duct is connected to the extending vent pipe, and the lower end is connected to the lowermost end of the drainage duct or the downstream side thereof. Further, the ventilating duct is connected to the drainage lateral branch pipe through the vent lateral branch pipe. By this vented duct, pressure fluctuation in the drainage horizontal branch pipe is suppressed, and drainage performance is enhanced.

  The single-pipe drainage system disclosed in Patent Document 2 includes only a drainage standpipe and does not include a vent standpipe. The collective joint incorporated in the drainage stack is configured so that the falling drainage is swirled by swirl vanes provided inside and flows along the pipe wall to form an air core inside. Thus, by separating the drainage and the air, the air can be replenished and released smoothly through the extended vent pipe, the pressure fluctuation in the drainage duct is suppressed, and the drainage performance is enhanced.

JP 2001-3419 A JP 2012-97551 A

  In the drainage system of Patent Document 1, since the ventilation vent pipe is connected to the drainage horizontal branch pipe, if the building becomes high-rise and the drainage load in the drainage duct increases, the pressure fluctuation in the drainage duct will be reduced. It becomes difficult to suppress, and there is a limit in drainage performance.

In the drainage system of Patent Document 2, as the building becomes taller and the drainage load increases, it is necessary to increase the diameter of the drainage stack, and for example, a collective joint having a diameter of 125 A or more may be required. This collective joint is very heavy and has the disadvantage of poor workability when installed on a floor slab. Moreover, since this collective joint has a large body diameter, the diameter of the through-hole formed in the floor slab must be increased, and reinforcement is required to ensure the building strength.
In order to avoid the above disadvantages, it is conceivable to reduce the diameter of the drainage stack (for example, 100A) and increase the number of drainage stacks instead, but if the number of drainage stacks increases, the installation process Is complicated, and the installation space is increased.

In order to solve the above-described problems, the present invention includes a drainage standing pipe that penetrates a floor slab of a building, and the drainage standing pipe is installed in the vicinity of the through-hole of the floor slab, and these gathering joints And a drainage branch pipe connected to the collective joint above or below the floor slab, and drainage from drainage equipment passes through the drainage branch pipe and the drainage stand. In the drainage system that flows down the pipeline, an air vent is further provided. The air vent is open to the atmosphere, the lower end is connected to the drain pan, and the middle part is the drain stand. It is connected to the middle part of a pipe line through a ventilation means.
According to the above configuration, the middle part of the ventilating duct is connected to the middle part of the drainage duct via the ventilation means, so that the air can be smoothly replenished and released from the drainage duct. Even if the drainage load of the drainage stack increases due to the building heightening, etc., pressure fluctuations in the drainage stack can be suppressed, and a good drainage function can be secured.

Preferably, the ventilation means has a ventilation side branch pipe, one end of the ventilation side branch pipe is connected to the ventilation standing pipe line, and the other end is connected to the collective joint.
According to the above configuration, since not only the drainage horizontal branch pipe but also the ventilation horizontal branch pipe is connected to the collective joint, the number of parts can be suppressed, and the configuration can be simplified.

Preferably, a plurality of connection ports spaced in the circumferential direction are formed in the side portion of the collective joint, the vent side branch pipe is connected to one of the connection ports, and at least one of the remaining connection ports. The drainage lateral branch pipe is connected to the drainage lateral branch pipe, and the drainage lateral branch pipe is smaller in diameter than the drainage lateral branch pipe, and the ventilation lateral branch pipe is connected to the connection port of the collective joint through a reduced diameter member. In this reduced diameter member, the first connecting portion to which the vent lateral branch pipe is connected has a smaller diameter than the second connecting portion connected to the connecting port.
According to the above configuration, the drainage lateral branch pipe and the ventilation lateral branch pipe can be connected by appropriately selecting the connection port of the collective joint. In addition, by using the reduced diameter member, it is possible to suppress or prevent the drainage from the drainage side branch pipe from entering the ventilation side branch pipe.

Preferably, the first connecting portion of the diameter-reducing member is eccentric with respect to the second connecting portion, and the central axis of the first connecting portion is located higher than the central axis of the second connecting portion.
According to the said structure, since the 1st connection part to which a ventilation horizontal branch pipe is connected exists in a high position, the entrance of the waste_water | drain from a drainage horizontal branch pipe to a ventilation horizontal branch pipe can be suppressed or prevented reliably. .

Preferably, a connection port is formed on a side portion of the collective joint, and the drainage horizontal branch pipe is connected to the connection port, and a branch portion that extends upward from the side portion is formed on the collective joint. The ventilation lateral branch pipe is connected to the branch connection port at the tip of the branch portion.
According to the above configuration, since the ventilation lateral branch pipe is connected to the branch connection port located at a high position, it is possible to reliably suppress or prevent the inflow of drainage from the drainage lateral branch pipe to the ventilation lateral branch pipe. .

Preferably, a connection port is formed on a side portion of the collective joint, and the drainage horizontal branch pipe is connected to the connection port, and between the upper end of the collective joint and the lower end of the drainage stack, A sub-joint is connected, this sub-joint is provided as part of the drainage stack, a sub-connecting port is formed on the side of the sub-joint, and the venting means has a vent side branch pipe, One end of the side branch pipe is connected to the ventilating duct, and the other end is connected to the sub-connecting port of the sub-joint.
According to the above configuration, since the ventilation lateral branch pipe is connected to the secondary connection port of the secondary joint, all the connection ports of the collective joint can be used to connect the drainage lateral branch pipe. In addition, since the sub-connection port is located above the connection port to which the drainage horizontal branch pipe is connected, it is possible to suppress or prevent wastewater from entering from the drainage lateral branch pipe into the ventilation lateral branch pipe.

Preferably, a connection port is formed on a side portion of the collective joint, and the drainage lateral branch pipe is connected to the connection port, and a vent port is formed on the collective joint above the connection port, The ventilating duct is connected to the vent through the venting means.
According to the above configuration, since the ventilating pipe line is connected to the collective joint not only through the drainage horizontal branch pipe but also through the venting means, the number of parts can be suppressed and the configuration can be simplified. Moreover, since the vent is disposed above the connection port, it is possible to suppress or prevent the drainage from entering the venting means from the drainage lateral branch pipe.

Preferably, a ventilation joint is further provided, the ventilation joint having an upper and lower connection portion and a side connection portion, and the side connection portion is connected to the vent of the collective joint, and the upper and lower connection portions are connected to each other. The ventilating pipe is connected, the ventilating joint constitutes the venting means, and the ventilating joint and the ventilating standpipe constitute the ventilating duct.
According to the above configuration, the connection structure between the ventilating duct and the collective joint can be simplified by using the vent joint.

In one aspect, the vent is formed with a female screw, and the side connection portion of the vent joint is screwed into the vent.
In another aspect, the collective joint is formed with a protrusion having the vent hole, and the side connection portion of the vent joint is connected to the protrusion.

Preferably, the ventilating pipe passes through the through-hole of the floor slab for installing the collective joint.
According to the above configuration, it is not necessary to separately form a through hole for the ventilating duct in the floor slab.

Preferably, the collective joint has swivel means for swirling the falling drainage therein.
According to the above configuration, the drainage function can be remarkably enhanced by the cooperation of the collective joint having the turning function and the ventilating duct. Compared to the case where a collective joint with a swivel function is used in a single-pipe drainage system, to obtain the same drainage performance, the diameter of the collective joint and the venting standpipe is reduced and the number of drainage standpipes is reduced. Since it is possible, the workability of the drainage system installation can be improved.

  Preferably, the ventilating duct is connected to the drainage duct via the venting means on all the floors or a plurality of floors of the building.

  According to the present invention, even if the drainage load increases, pressure fluctuation in the drainage stack can be suppressed, and a good drainage function can be secured.

It is the schematic which shows the drainage system which concerns on 1st Embodiment of this invention. It is a principal part enlarged front view in the drainage system of the 1st embodiment. It is a principal part enlarged front view in the drainage system of a 2nd embodiment of the present invention. It is a principal part enlarged front view in the drainage system of a 3rd embodiment of the present invention. It is a principal part enlarged front view in the drainage system of a 4th embodiment of the present invention. It is the schematic which shows the drainage system which concerns on 5th Embodiment of this invention. It is a principal part enlarged front view of the drainage system of the 5th embodiment. It is a principal part enlarged front view of the drainage system concerning a 6th embodiment of the present invention. It is a principal part enlarged front view of the drainage system concerning a 7th embodiment of the present invention. In the drainage system of the 7th embodiment, it is a principal part enlarged front view shown omitting a ventilation standing pipe line and a ventilation joint. In the drainage system of an 8th embodiment of the present invention, it is a principal part enlarged front view shown omitting a ventilation stand pipe and a joint for ventilation.

  Hereinafter, a first embodiment of the present invention will be described with reference to FIGS. 1 and 2. FIG. 1 schematically shows a drainage system of each dwelling unit in a high-rise building such as an apartment. This drainage system is a new type of two-pipe type that is different from the conventional two-pipe type, and is provided with a drainage standpipe 1 and a vent standpipe 2 that penetrate the floor slab 100 of each floor. The upper end of the drainage duct 1 is connected to the lower end of the extended vent pipe 3, and the upper end of the extended vent pipe 3 is open to the atmosphere on the roof. The lower end of the drainage stack 1 is connected via a leg joint 4 to a horizontal main pipe 5 that guides drainage to a sewer or a sewage treatment tank.

  The drainage stack 1 has a collective joint 10 installed in the through-hole 101 of the floor slab 100 of each floor, and a drainage stack 15 connected between the collective joints 10. The collective joint 10 is made of cast iron, for example, but may be made of resin or may be composed of a composite material of iron and resin. An intermediate body portion of the collective joint 10 is inserted into the through-hole 101 and fixed by a mortar 102 filled in the through-hole 101. In addition, the apertures of the collective joint 10 and the drainage stack 15 are 100A or less (for example, 50A to 100A).

A swivel means such as swirl vanes is provided inside the collective joint 10 to swivel the falling drainage.
At the part of the collective joint 10 that protrudes upward from the floor slab 100, there are formed a connection port 10a at the upper end and a plurality of connection ports 10b, 10c, and 10d that open to the side and are spaced apart from each other in the circumferential direction. A connection port 10 e is also formed at the lower end of the portion of the collective joint 10 that protrudes downward from the floor slab 100.

  The upper end opening 10a of the collective joint 10 is connected to the lower end of the upper drainage stack 15 and the lower end opening 10e is connected to the upper end of the lower drainage stack 15. In addition, the lower end of the extended vent pipe 3 is connected to the upper end opening 10a of the collective joint 10 on the uppermost floor.

  The connection ports 10b, 10c, 10d on the side of the collective joint 10 are formed with the same diameter and the same height, and when used in a general single-pipe drainage system, all of the connection ports 10b, 10c, 10d are used. Or the drainage side branch pipe mentioned later can be connected to the selected connection port. Note that the connection ports 10b, 10c, and 10d may have a diameter corresponding to the drainage device, even if they do not have the same diameter.

  In the present embodiment, the drainage horizontal branch pipe 16 is connected to the connection ports 10 b and 10 c of the collective joint 10. As shown in FIG. 1, the drainage horizontal branch pipe 16 is connected to various drainage devices 17a, 17b, and 17c such as a bathtub, a washing machine, and a wash basin.

  The diameter of the ventilating duct 2 is smaller than the diameter of the drainage duct 1 and is 75A or less. Although the material of the ventilating duct 2 is not particularly limited, it is preferable to form the ventilating duct 2 with a refractory vinyl chloride resin like the drainage duct 15. Or it is preferable that the sheet | seat which has an obstruction | occlusion function when it receives heat is wound by the appropriate place.

  The ventilating duct 2 is connected to the drainage duct 1 via a vent lateral branch pipe 20 (ventilating means) on each floor of the building. One end of the ventilating side branch pipe 20 is connected to the ventilating duct 2, and the other end is connected to the collective joint 10. The ventilation side branch pipe 20 has a smaller diameter than the drainage side branch pipe 16.

  A connection structure between the vent lateral branch pipe 20 and the collective joint 10 will be described. The remaining connection port 10d of the collective joint 10 is connected to the end of the vent lateral branch pipe 20 via a reduced diameter member 21 (joint). The reduced diameter member 21 has a first connection portion 21a connected to the vent lateral branch pipe 20 and a second connection portion 21b connected to the connection port 10d. A tapered shape is formed such that the diameter of the second connecting portion 21b increases.

The upper end of the ventilating duct 2 is connected to the collective joint 10 of the drainage duct 2 on the uppermost floor, so that it is opened to the atmosphere via the extended vent pipe 3. The lower end of the ventilating duct 2 is connected to the collective joint 10 on the lowest floor. Note that the lower end of the ventilating duct 2 may be connected to the lower end of the drainage duct 1, or the leg joint 4 and the horizontal main pipe 5 on the downstream side thereof.
In each floor between the uppermost floor and the lowermost floor, the midway part of the ventilating duct 2 is connected to the collective joint 10 (the midway part of the drainage duct 1) via the ventilating lateral branch pipe 20.

  In the above configuration, the drainage from the drainage devices 17a to 17c of each dwelling unit in each staircase flows into the collective joint 10 of the drainage stack 1 through the drainage horizontal branch pipe 16, flows down the drainage stack 1 and goes to the horizontal main pipe 5. And then sent to a sewer or sewage treatment tank.

In the collective joint 10, the drainage from the drainage stack 15 on the upper floor and the drainage from the plurality of drainage horizontal pipes 16 are combined. Since it isolate | separates, the pressure fluctuation in the drainage stack 1 can be suppressed.
Further, since the ventilating duct 2 is connected to the collective joint 10 through the vent lateral branch pipes 20 on each floor, it is possible to smoothly replenish air to the collective joint 10 and release air from the collective joint 10. Therefore, the pressure fluctuation in the drainage stack 1 can be further suppressed.

As described above, the drainage performance can be remarkably improved by the cooperation of the venting duct 2 for replenishing and escaping air to the drainage duct 1 and the collective joint 10 having a turning function.
Therefore, even if the drainage load is large, it is possible to reduce the size and the number of drainage stack pipes 1.

  In the present embodiment, since the vent side branch pipe 20 is connected to the connection port 10d of the collective joint 10 using the reduced diameter member 21, the drainage from the drainage side branch pipe 16 is prevented from entering the vent side branch pipe 20. Or it can be suppressed. Therefore, the collective joint 10 can be maintained in a state in which ventilation is possible.

  Next, another embodiment of the present invention will be described. In these embodiments, components corresponding to the embodiments described earlier are assigned the same reference numerals, and detailed descriptions thereof are omitted.

  In the second embodiment shown in FIG. 3, the diameter-reducing member 22 for connecting the vent side branch pipe 20 to the collective joint 10 has a small-diameter first connection portion 22 a and a large-diameter second connection portion 22 b in an annular shape. It is connected through a step. The effect is the same as that of the reduced diameter member 21.

  In the third embodiment shown in FIG. 4, the reduced diameter member 23 for connecting the vent side branch pipe 20 to the collective joint 10 is such that the first connecting portion 23a having a small diameter is offset from the second connecting portion 23b having a large diameter. The center axis of the first connection part 23a is higher than the center axis of the second connection part 23b. According to the reduced diameter member 23, the ventilation side branch pipe 20 is higher than the drainage side branch pipe 16, so that the drainage from the drainage side branch pipe 16 is surely avoided or suppressed from entering the ventilation side branch pipe 20. it can.

  In 4th Embodiment shown in FIG. 5, 10 A of joint joints which have the elbow part 10x (branch part) are used. The other structure of the collective joint 10A is the same as that of the collective joint 10 described above. The elbow portion 10x extends upward from the side portion of the collective joint 10A, and an end portion of the ventilating lateral branch tube 20 is connected to the upper connection port 10y (branch connection port) via an elbow tube 24. ing. Since the connection port 10y of the elbow portion 10x is higher than the drainage lateral branch pipe 16, it is possible to reliably avoid or suppress the drainage from the drainage lateral branch pipe 16 from entering the vent lateral branch pipe 20.

In the fifth embodiment shown in FIGS. 6 and 7, the sub-joint 11 for connecting the vent side branch pipe 20 is incorporated in the drainage stack pipe 1 to constitute a part of the drainage stack pipe 1. . The sub-joint 11 includes a trunk portion 11x that extends linearly vertically and a branch portion 11y that branches obliquely upward from the trunk portion 11x.
The lower end of the drainage stack 15 is connected to the upper end connection port 11a of the trunk portion 11x. The lower end connection port 11 b of the trunk portion 11 x is connected to the upper end connection port 10 a of the collective joint 10 through the short pipe 12.
A connecting port 11c (sub connecting port) that opens to the side is formed at the end of the branch portion 11y, and the end of the ventilating lateral branch pipe 20 is connected to the connecting port 11c via a joint (not shown). Yes.

  In the fifth embodiment, all the side connection ports 10b to 10d of the collective joint 10 or arbitrarily selected connection ports can be used to connect the drainage side branch pipe 16, and the ventilation side branch pipe 10 Therefore, it is not necessary to reduce the number of drainage horizontal branch pipes 16. Further, since the connection port 11c of the sub-joint 11 is at a position higher than the connection ports 10b to 10d of the collective joint 10, it is reliably avoided that the drainage from the drainage side branch pipe 16 enters the ventilation side branch pipe 20. Can be suppressed.

  The sixth embodiment shown in FIG. 8 has a configuration similar to that of the fifth embodiment, but the collective joint 13 has a trunk portion 13x and a branch portion 13y, like the subjoint 11. The connection port 11b of the sub-joint 11 is connected to the upper end connection port 13a of the trunk portion 13x via the short pipe 12, the lower floor drainage pipe 15 is connected to the lower end connection port 13b of the trunk portion 13x, and the branch portion 13y A drainage horizontal branch pipe 16 is connected to the connection port 13c. In the present embodiment, only one drainage horizontal branch pipe 16 is connected to the collective joint 13 in each floor, but it is assumed that the drainage load is lower than in other embodiments.

  Also in the seventh embodiment shown in FIGS. 9 and 10, the side connection ports 10 b to 10 c of the collective joint 10 are all used for connecting the drainage lateral branch pipe 16. In the present embodiment, a vent 10h is formed in the body portion of the collective joint 10 above the connection ports 10b to 1d. An internal thread is formed on the inner periphery of the vent 10h.

  On the other hand, the ventilating duct 2A has a ventilating joint 25 (ventilating means) connected to the collective joint 10 on each floor, and a ventilating pipe 26 connected between the venting joints 25. The ventilation joint 25 has upper and lower connection portions 25a and 25b and a side connection portion 25c.

A male screw is formed on the outer periphery of the side connection portion 25c. By screwing the side connection portion 25c into the vent hole 10h of the collective joint 10, the vent joint 25 is coupled to the collective joint 10.
The lower end of the upper vent vent pipe 26 is connected to the upper connection portion 25a of the vent joint 25, and the upper end of the lower vent vent pipe 26 is connected to the lower connection portion 25b.

The ventilation stack 2 </ b> A approaches the drainage stack 1 and extends along the drainage stack 1. The ventilating pipe 26 has a small diameter (diameter 30 mm or less, preferably 20 mm or less) and penetrates the through-hole 101 for installing the collective joint 10, so that a separate through-hole is formed for the ventilating duct 2 </ b> A. You do n’t have to.
The ventilating pipe 26 may be constituted by a metal pipe or a vinyl chloride pipe, but if it is a flexible pipe such as a crosslinked polyethylene pipe, the workability is improved.

  In the seventh embodiment, the female joint vent 10h is formed in the collective joint 10. However, particularly when the collective joint 10B is made of resin, the vent 10h ′ is used as in the eighth embodiment shown in FIG. An attached protrusion 10g may be formed. A vent joint similar to the vent joint 25 of the seventh embodiment is connected to the projection 19g. However, the side connection portion of the ventilation joint has a cylindrical shape and is fitted to the protrusion 19g.

The present invention is not limited to the embodiment described above, and various modifications can be made without departing from the spirit of the invention.
In the above embodiment, the ventilating pipe line is connected to the drainage standing pipe line through the ventilation means on each floor. However, when the drainage load is small, one floor is skipped and the two floors are connected to the drainage standing pipe line. Also good. It is preferable to connect the venting duct to the drainage duct at multiple locations (multiple floors) in the middle, but if the building is low-rise, even if it is connected to the drainage duct at only one location in the middle Good.

In the above embodiment, one drainage stand and one vent stand are installed per dwelling unit. However, when there are few drainage devices per room (per dwelling unit) such as hotels and dormitories, etc. The two drainage units may share the drainage stack and the ventilation stack.
One venting duct may be connected to a plurality of drainage ducts.
You may connect a ventilation standing line to a drainage standing line under a floor slab.

  The present invention is applicable to a building drainage system.

DESCRIPTION OF SYMBOLS 1 Drainage pipe line 2, 2A Ventilation pipe line 3 Climbing ventilation pipes 10, 10A, 10B, 13 Collective joint 10b-10d, 13c Joint joint side connection port 10h, 10h 'Vent 10g Projection 10x Elbow part ( Branch)
10y Branch connection port 11 Sub-joint 11c Sub-connection port 15 Drainage stack 16 Drainage side branch pipes 17a to 17c Drainage equipment 20 Ventilation side branch pipe (ventilation means)
21, 22, 23 Reduced-diameter members 21 a, 22 a, 23 a First connection portions 21 b, 22 b, 23 b Second connection portion 25 Ventilation joint 26 Ventilation stand pipe 100 Floor slab 101 Through-hole

Claims (12)

It has a drainage standway that penetrates the floor slab of the building, and this drainage standway has a collective joint installed near the through-hole of the floor slab and a drainage standpipe connected between these collective joints. In the drainage system, a drainage branch pipe is connected to the collective joint above or below the floor slab so that drainage from drainage equipment flows down the drainage stack through the drainage branch pipe.
Further, an air vent is provided. The air vent is open to the atmosphere, the lower end is connected to the drainage duct, and the middle part is connected to the middle part of the drainage duct via ventilation means. A drainage system characterized by being connected.   The said ventilation means has a ventilation side branch pipe, One end of this ventilation side branch pipe is connected to the said ventilation standing pipe line, The other end is connected to the said joint joint. Drainage system. A plurality of connection ports spaced apart in the circumferential direction are formed in the side portion of the collective joint, the vent side branch pipe is connected to one of the connection ports, and the drainage is connected to at least one of the remaining connection ports. A side pipe is connected,
The vent lateral branch pipe is smaller in diameter than the drainage lateral branch pipe, and the vent lateral branch pipe is connected to the connection port of the collective joint via a reduced diameter member. The drainage system according to claim 2, wherein the first connection part to which the branch pipe is connected has a smaller diameter than the second connection part connected to the connection port.   The first connecting portion of the reduced diameter member is eccentric with respect to the second connecting portion, and the center axis of the first connecting portion is located higher than the center axis of the second connecting portion. The drainage system according to claim 3. A connection port is formed on the side of the collective joint, and the drainage horizontal branch pipe is connected to the connection port,
The branch joint is formed in the collective joint so as to extend upward from the side thereof, and the ventilation lateral branch pipe is connected to the branch connection port at the tip of the branch portion. Drainage system. A connection port is formed on the side of the collective joint, and the drainage horizontal branch pipe is connected to the connection port,
A sub-joint is connected between the upper end of the collective joint and the lower end of the drainage stack, and this sub-joint is provided as a part of the drainage stack, and a sub-connecting port is provided at the side of the sub-joint. Formed,
The ventilation means has a ventilation side branch pipe, one end of the ventilation side branch pipe is connected to the ventilation standing pipe line, and the other end is connected to the auxiliary connection port of the auxiliary joint. The drainage system according to claim 1. A connection port is formed on the side of the collective joint, and the drainage horizontal branch pipe is connected to the connection port,
The drainage according to claim 1, wherein a vent hole is formed in the collective joint above the connection port, and the vent pipe is connected to the vent port through the vent means. system. The vent joint further includes an upper and lower connecting portion and a side connecting portion, and the side connecting portion is connected to the vent of the collective joint, and the upper and lower connecting portions are provided with a ventilation standpipe. Is connected,
The drainage system according to claim 7, wherein the ventilation means is constituted by the ventilation joint, and the ventilation duct is constituted by the ventilation joint and the ventilation stack.   The drainage system according to claim 8, wherein a projection having the vent hole is formed in the collective joint, and a side connection portion of the vent joint is connected to the projection.   The drainage system according to claim 8 or 9, wherein the ventilating pipe passes through the through hole of the floor slab for installing the collective joint.   The drainage system according to any one of claims 1 to 10, wherein the collective joint has a swivel means for swirling falling drainage.   The drainage pipe according to any one of claims 1 to 11, wherein the ventilating duct is connected to the drainage duct via the venting means in all or a plurality of floors of the building. system.

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