JP7160321B2 - Drainage structure and siphon drainage system - Google Patents

Description

The present disclosure relates to drainage structures and siphon drainage systems.

Patent Document 1 listed below discloses a drainage system in which a drainage temporary storage tank is connected between a plumbing fixture such as a bathtub or a washing area and a siphon drainage pipe. This temporary storage tank is arranged in the underfloor space between the slab and the floor surface. Moreover, the drain pipe of the bathtub is connected to the drain trap of the washing place, and the water of the bathtub is drained through the drain pipe of the washing place.

Japanese Patent No. 4927450

By the way, when draining the water from the bathtub, the water in the bathtub is stored and drained, so a large amount of the drain will flow into the drain pipe. Since the diameter of the siphon drain pipe is smaller than that of the conventional sloped pipe, there is a risk that the drain from the bathtub will overflow into the washing area through the drain trap of the washing area until the siphon force is generated in the siphon drain pipe. For this reason, a temporary storage tank like the above-described conventional example has been devised.

However, in order to secure the capacity of the temporary storage tank, the temporary storage tank must have a certain height, and it is necessary to secure an underfloor space according to this height. For this reason, it was difficult to lower the floor when providing a temporary storage tank.

SUMMARY OF THE INVENTION An object of the present invention is to provide a drainage structure and a siphon drainage system capable of further lowering the floor.

The drainage structure according to the invention described in claim 1 comprises: a first water-related device that serves as a sump drain that drains water after being stored; and a second water-related device that serves as continuous drainage without storing water and a sealed water reservoir formed by a bottom portion, a first inclined portion extending obliquely upward from the bottom portion, and the bottom portion and the first inclined portion provided in the drainage portion of the first water-related equipment. a first drainage trap provided in the drainage part of the second water-related equipment, and a first siphon drainage pipe connected to the downstream side of the first drainage trap. , a second siphon drain pipe connected to the downstream side of the second drain trap, and connecting the downstream portion of the first drain trap and the downstream portion of the second drain trap above the sealing water reservoir; a first bypass pipe , wherein the first drain trap includes a second inclined portion provided downstream of the first inclined portion and having a portion extending obliquely downward; and a third flow passage portion provided downstream of the portion and extending in the horizontal direction, wherein the first bypass pipe is connected to the second inclined portion or the third flow passage in the first drain trap. connected to the

According to the first aspect of the invention, the first water-related appliance is a accumulating drain that is drained after the drain is stored. This first water-related equipment has a first drainage trap provided in a drainage section, and a first siphon drainage pipe connected to the downstream side of the first drainage trap. On the other hand, in the second water-related equipment, continuous drainage without water storage is used. This second water-related appliance has a second drainage trap provided in the drainage section, and a second siphon drainage pipe connected to the downstream side of the second drainage trap. The first drain trap has a bottom, a first slant extending obliquely upward from the bottom, and a sealing reservoir formed by the bottom and the first slant. Sealed water can be kept in Further, since the first bypass pipe connecting the downstream side portion of the first drainage trap and the downstream side portion of the second drainage trap is provided above the sealing water reservoir, the first bypass pipe is provided without being affected by the sealing water. Air can be accommodated between the side of the first water-related equipment and the side of the second water-related equipment. Therefore, even when there is a large amount of wastewater due to the accumulated wastewater, the wastewater can be smoothly discharged without generating a negative pressure, so that the wastewater can be prevented from overflowing from the second water-related equipment.

Further, according to the first aspect of the invention , the first drain trap includes a second inclined portion provided downstream of the first inclined portion and having a portion extending obliquely downward, and the second inclined portion and a third flow path portion provided downstream of and extending in the horizontal direction. Since the first bypass pipe is connected to the second inclined portion or the third flow channel portion of the first drain trap, the first bypass pipe is connected to the first drain trap at a position away from the sealing pool. there is That is, the first bypass pipe can be connected to the first drain trap at a location where there is room in the space other than the location where the sealing water pool is located in the underfloor space.

The drainage structure according to the invention described in claim 2 comprises: a first water-related device that serves as a sump drain that drains water after being stored; and a second water-related device that serves as continuous drainage without storing water and a sealed water reservoir formed by a bottom portion, a first inclined portion extending obliquely upward from the bottom portion, and the bottom portion and the first inclined portion provided in the drainage portion of the first water-related equipment. a first drainage trap provided in the drainage part of the second water-related equipment, and a first siphon drainage pipe connected to the downstream side of the first drainage trap. , a second siphon drain pipe connected to the downstream side of the second drain trap, and connecting the downstream portion of the first drain trap and the downstream portion of the second drain trap above the sealing water reservoir; A portion of the first drain trap corresponding to the drain portion of the first water-related equipment is formed in a substantially cylindrical shape, and the upstream side is larger in diameter than the downstream side .

According to the second aspect of the invention, the portion of the first drain trap corresponding to the drain portion of the first water-related appliance is formed in a substantially cylindrical shape whose diameter increases from the downstream side to the upstream side. Therefore, even if there is a large amount of wastewater at one time, it can be smoothly discharged downstream.

The drainage structure according to the invention described in claim 3 comprises: a first water-related device that serves as a sump drain that drains water after being stored; and a second water-related device that serves as continuous drainage without storing water. and a sealed water reservoir formed by a bottom portion, a first inclined portion extending obliquely upward from the bottom portion, and the bottom portion and the first inclined portion provided in the drainage portion of the first water-related equipment. a first drainage trap provided in the drainage part of the second water-related equipment, and a first siphon drainage pipe connected to the downstream side of the first drainage trap. , a second siphon drain pipe connected to the downstream side of the second drain trap, and connecting the downstream portion of the first drain trap and the downstream portion of the second drain trap above the sealing water reservoir; and a first bypass pipe, wherein the first drain trap has an upwardly opening portion other than a portion that communicates with the drain portion of the first water-related equipment .

According to the third aspect of the invention , the first drain trap has an opening other than the part communicating with the drain of the first water-related equipment, and this opening is open upward. As a result, it is possible to drain water other than the first water-related equipment, such as a waterproof pan, to the first water drain trap through the opening.

According to a fourth aspect of the present invention, there is provided a drainage structure according to any one of the first to third aspects, wherein the first bypass pipe has at least a part of the first drainage trap. and the second drain trap.

According to the fourth aspect of the present invention, the waste water from the first water-related equipment is stored and drained after being stored. Drainage is drained at once. Excess waste water flows into the first bypass pipe until a siphon force is generated in the first siphon drain pipe. Air in the first bypass pipe is pushed out to the second drain trap side as the drain water flows in. At least part of the first bypass pipe is located above both the first and second drain traps, so that the waste water that has flowed into the first bypass pipe is less likely to flow toward the second drain trap. . When a siphon force is generated in the first siphon drain pipe, the waste water from the first plumbing fixture and the waste water flowing into the first bypass pipe are rapidly discharged through the first siphon drain pipe. As a result, it is possible to suppress overflowing of the drained water from the first water-related equipment to the second water-related equipment.

On the other hand, the drainage from the second plumbing appliance is continuous drainage without water storage. Air in the pipe is pushed out through the first bypass pipe to the first drain trap side, so that the drain from the second plumbing appliance is smoothly performed. When a siphon force is generated in the second siphon drain pipe, the waste water from the second plumbing fixture is rapidly discharged through the second siphon drain pipe.

In the drainage structure according to the invention of claim 5, in the invention of any one of claims 1 to 4 , the first bypass pipe has the first drainage from the second drainage trap side. A first check valve is provided which allows flow to the trap side and not to the opposite side.

According to the fifth aspect of the invention, since the first bypass pipe is provided with the first check valve, a large amount of waste water is drained at once from the first drain trap side to the second drain trap side. flow to is suppressed. Therefore, it is possible to prevent the drainage from the first drainage trap from overflowing into the second drainage trap.

According to a sixth aspect of the present invention, there is provided a drainage structure according to any one of the first to fifth aspects, wherein the first bypass pipe is provided with an intake valve.

According to the sixth aspect of the invention, when negative pressure is generated in the first bypass pipe, such as when draining water from the first water-related appliance and the second water-related appliance at the same time, outside air is discharged from the intake valve. Since the water is taken in, it is possible to prevent the seals of the first and second drain traps from being broken.

According to a seventh aspect of the present invention, there is provided a drainage structure according to any one of the first to fifth aspects, wherein a vent pipe is connected to the first bypass pipe.

According to the seventh aspect of the invention, when a negative pressure is generated in the first bypass pipe, such as when the first water-related equipment and the second water-related equipment are drained at the same time, outside air flows from the ventilation pipe. Since the water is taken in, it is possible to prevent the seals of the first and second drain traps from being broken.

The drainage structure according to the invention of claim 8 is , in the invention of claim 7 , connected to another drainage trap provided for another water-related appliance and to the downstream side of the other drainage trap. a siphon drain pipe, an individual vent pipe connected to the downstream side of the other drain trap, a header to which the vent pipe and the individual vent pipe are connected, and a header connected to the header and open to the atmosphere and a confluent trachea.

According to the eighth aspect of the invention, the vent pipes and the individual vent pipes are assembled in the header, and are open to the atmosphere through the combined vent pipes. Therefore, there is no need to extend the ventilation pipes or individual ventilation pipes to the outside. As a result, air can be sucked and exhausted all at once, and the number of parts can be reduced compared to the case where the vent pipes and the individual vent pipes are individually opened to the atmosphere.

The drainage structure according to the invention of claim 9 is characterized in that , in the invention of any one of claims 1 to 8 , the A second bypass pipe connects the first drain trap side and the second drain trap side, and has a bottom surface of the pipeline arranged lower than the top surface of the second drain trap.

According to the ninth aspect of the invention, even in the case where the second drain trap is not completely filled and the water is full, excess drain water passes through the second bypass pipe and is connected to the downstream side of the first drain trap. 1 flow to the siphon drainpipe. Therefore, it is possible to prevent the waste water from overflowing the second waste water trap.

The drainage structure according to the invention of claim 10 is , in the invention of claim 9, having a drainage pipe connecting the second drainage trap and the second siphon drainage pipe, and in the second bypass pipe The bottom surface of the pipeline is arranged higher than the bottom surface of the drain pipe.

According to the tenth aspect of the invention, the drainage from the second drain trap does not always flow to the second bypass pipe, and the second siphon drain pipe quickly fills up, so the siphon start-up is delayed. no.

In the drainage structure according to the invention of claim 11, in the invention of claim 9 or 10 , the second bypass pipe has a flow from the second drainage trap side to the first drainage trap side. A second check valve is provided to allow flow on the opposite side and not allow flow on the opposite side.

According to the eleventh aspect of the invention, since the second bypass pipe is provided with the second check valve, the flow from the first drain trap side to the second drain trap side through the second bypass pipe is suppressed. be done.

The drainage structure according to the invention according to claim 12 is the invention according to any one of claims 1 to 11 , wherein the downstream portion of the first drainage trap and the downstream portion of the second drainage trap at least one of which has an auxiliary chamber.

According to the twelfth aspect of the invention, the auxiliary chamber can receive excess drainage exceeding the capacity of the first bypass pipe. When the water pumped up from the first water-related equipment is used in the second water-related equipment, a larger amount of water than usual is discharged from the second water-related equipment. Even in such a case, by receiving the drainage in the auxiliary chamber, it is possible to prevent the drainage from the second plumbing appliance from being stagnated. In addition, it is possible to deal with a larger amount of stored and drained water from the first water-related equipment.

A siphon drainage system according to the invention of claim 13 has a drainage stack arranged in the vertical direction of a building, and the drainage structure according to any one of claims 1 to 12 . , The first siphon drain pipe and the second siphon drain pipe each comprise a horizontal drain pipe for flowing waste water in a horizontal direction, and a vertical pipe connected to the drain stack pipe for flowing waste water downward from the horizontal drain pipe. have.

According to the thirteenth aspect of the present invention, the drainage from the first plumbing appliance can be flowed to the drainage stack through the horizontal pipe and the vertical pipe of the first siphon drainage pipe. In addition, the drainage from the second plumbing equipment can be flowed to the drainage stack through the horizontal pipe and the vertical pipe of the second siphon drainage pipe.

According to the drainage structure and the siphon drainage system according to the present invention, it is possible to provide a drainage structure and a siphon drainage system capable of further lowering the floor.

BRIEF DESCRIPTION OF THE DRAWINGS It is sectional drawing which shows the outline|summary of the siphon drainage system which concerns on 1st Embodiment. BRIEF DESCRIPTION OF THE DRAWINGS It is a perspective view which shows the outline of the drainage structure which concerns on 1st Embodiment. FIG. 4 is a cross-sectional view showing the initial stage of draining water from the bathtub in the drainage structure according to the first embodiment. FIG. 4 is a cross-sectional view showing a drain state after generation of a siphon force; FIG. 4 is a cross-sectional view showing a state of drainage from a washing place in the drainage structure according to the first embodiment; 4 is a cross-sectional view showing a first drainage trap of the drainage structure according to the first embodiment; FIG. 1 is an exploded perspective view showing a detachable apron of a bathtub in the drainage structure according to the first embodiment; FIG. It is a perspective view which shows typically the drainage structure which concerns on 2nd Embodiment. It is a perspective view which shows typically the drainage structure which concerns on 3rd Embodiment. It is a perspective view which shows typically the drainage structure which concerns on 4th Embodiment. 2 is a perspective view schematically showing a drainage structure according to Reference Example 1. FIG. FIG. 11 is a perspective view schematically showing a drainage structure according to Reference Example 2; It is a sectional view showing the drainage structure concerning a 5th embodiment. It is a sectional view showing the drainage structure concerning a 6th embodiment. FIG. 14 is a cross-sectional view showing a first drainage trap of the drainage structure according to the seventh embodiment; (A) is a plan view and cross-sectional view showing a first drainage trap and a drainage pipe of a drainage structure according to a comparative example, and (B) shows a first drainage trap and a drainage pipe of a drainage structure according to a seventh embodiment; It is a plan view and a cross-sectional view. FIG. 22 is a cross-sectional view showing a first drainage trap of the drainage structure according to the eighth embodiment;

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments for carrying out the present invention will be described based on the drawings.

[First embodiment]
In FIG. 1 , a siphon drainage system 10 according to this embodiment has a drainage stack 14 and a drainage structure 16 .

The drainage stack 14 passes through a through hole 25 in a floor slab 24 of the building 15. - 特許庁This drainage stack 14 is provided with a drainage joint 28 that connects the vertical pipes 31B and 32B, which will be described later. It is configured to merge with the waste water from the In the drawings used in the following explanation, in order to explain the piping structure in an easy-to-understand manner, pipe fittings, pipes, the configuration of the connecting parts of each pipe, the direction of the pipes, etc. are omitted or simplified as appropriate. It is

(drainage structure)
The drainage structure 16 includes a bathtub 11 as an example of a first water-related appliance, a washing area 12 as an example of a second water-related appliance, a first drainage trap 21, a second drainage trap 22, and a first bypass pipe 18. , a first siphon drain pipe 31 and a second siphon drain pipe 32 .

The bathtub 11 is an example of a first water-related equipment that is used by storing water 20, and the wastewater is a accumulating wastewater that is drained after the water is stored. The washing place 12 is an example of the second water-related equipment, and the drainage is continuous drainage without stored water. A bathtub 11 and a washing place 12 are adjacent to each other with a gap S therebetween. The bathtub 11 and the washing area 12 may be integrated with each other as illustrated, or may be separate from each other.

The first drain trap 21 and the second drain trap 22 are so-called water-sealed traps for preventing backflow of foul odors, gases, and the like. The first drain trap 21 is provided in the drain section 41 of the bathtub 11 . The second drain trap 22 is provided in the drain section 42 of the wash area 12 .

As shown in FIG. 2, the first bypass pipe 18 connects a drain pipe 51, which is an example of a downstream portion of the first drain trap 21, and a drain pipe 52, which is an example of a downstream portion of the second drain trap 22. It is a tube that The first bypass pipe 18 is provided in the gap S (see FIG. 1) between the bathtub 11 and the washing place 12 so as not to be seen by the user during normal use. By providing the first bypass pipe 18 in the gap S, the space can be effectively used. Note that the first bypass pipe 18 may be provided at other locations such as between the bathroom and the wall of the building (not shown).

As shown in FIG. 3 , at least a portion of the pipeline in the first bypass pipe 18 , such as the uppermost portion 18</b>H, is located above both the first drain trap 21 and the second drain trap 22 . Here, “above both the first drain trap 21 and the second drain trap 22 ” means above the top surface 21 A of the first drain trap 21 and above the top surface 22 A of the second drain trap 22 . The first bypass pipe 18 is formed, for example, in an inverted U shape, and includes a vertical pipe portion 18A on the side of the first drain trap 21, a vertical pipe portion 18B on the side of the second drain trap 22, and a connecting portion of the vertical pipe portions 18A and 18B. 18D. The connecting portion 18D extends, for example, in the horizontal direction. The uppermost portion 18H is the bottom surface of this pipeline, and the bottom surface is located above both the first drain trap 21 and the second drain trap 22. As shown in FIG. If the height of the bottom surface of the pipeline at the connecting portion 18D is not constant, the highest position is the top portion 18H. Although the uppermost part 18H is mentioned as at least a part of the first bypass pipe 18, parts other than the uppermost part 18H are located above both the first drain trap 21 and the second drain trap 22. You may have

The drain pipe 51 includes an upper horizontal pipe portion 51A extending laterally from the first drain trap 21 and joining the vertical pipe portion 18A of the first bypass pipe 18, and a vertical pipe portion 51B extending downward from the lower end of the vertical pipe portion 18A. , and a lower horizontal tube portion 51C extending laterally from the lower end of the vertical tube portion 51B. Similarly, the drain pipe 52 includes an upper horizontal pipe portion 52A extending laterally from the second drain trap 22 and joining the vertical pipe portion 18B of the first bypass pipe 18, and a vertical pipe extending downward from the lower end of the vertical pipe portion 18B. It has a portion 52B and a lower horizontal tube portion 52C extending laterally from the lower end of the vertical tube portion 52B. The configuration of the drainage pipes 51 and 52 is not limited to this, and any configuration that allows drainage from the first drainage trap 21 and the second drainage trap 22 may be used.

An intake valve 30 is provided in the first bypass pipe 18 . The intake valve 30 is a component for allowing air from the outside to pass through to the first bypass pipe 18 and for preventing drainage and air from passing from the first bypass pipe 18 to the outside. The intake valve 30 is provided, for example, at the upper end of the extension portion 18C of the vertical pipe portion 18A. Including this extended portion 18C, the first bypass pipe 18 can be said to be formed in the shape of a mirrored letter that is an inverted h-letter. When viewed from the opposite side, the first bypass pipe 18 is h-shaped. Note that the intake valve 30 may be provided at the connecting portion 18</b>D of the first bypass pipe 18 . Also, the extension portion 18C and the intake valve 30 may be provided above the vertical pipe portion 18B.

The height position of the uppermost portion 18H of the first bypass pipe 18 is desirably equal to or higher than the height position of the standard water head H of the water 20 stored in the bathtub 11 . The reference of the water head H is the bottom of the bathtub 11, for example. The standard water head H corresponds to the amount of hot water stored in the bathtub 11 when a person takes a bath, for example, the amount of hot water that does not overflow the bathtub 11 when the person sits down in the bathtub 11 . The uppermost portion 18H is the maximum height at which overflow does not occur between the vertical pipe portions 18A and 18B of the first bypass pipe 18, and corresponds to the height of the bottom surface of the connecting portion 18D.

In FIG. 2, the first siphon drain pipe 31 is connected downstream of the first drain trap 21 and the first bypass pipe 18 . Also, the second siphon drain pipe 32 is connected downstream of the second drain trap 22 and the first bypass pipe 18 .

Specifically, the first siphon drain pipe 31 is connected to the end of the lower horizontal pipe portion 51C of the drain pipe 51 . Also, in FIG. 1, the first siphon drain pipe 31 has a horizontal pipe 31A that allows drainage to flow in the horizontal direction, and a vertical pipe 31B that is connected to the drainage stack 14 and allows drainage from the horizontal pipe 31A to flow downward. is doing. The second siphon drain pipe 32 has a horizontal drain pipe 32A for laterally draining the waste water, and a vertical pipe 32B connected to the drain stack 14 for draining the drain downward from the lateral drain pipe 32A. Lower ends of the vertical pipes 31B and 32B are connected to the drain joint 28. As shown in FIG. The first siphon drain pipe 31 is arranged in parallel with the second siphon drain pipe 32 on the far side.

As shown in FIG. 6, a communicating pipe 21B as a portion corresponding to the drain portion 41 of the bathtub 11 in the first drain trap 21 provided downstream of the drain portion 41 extends downward from the drain portion 41 of the bathtub 11. It is formed in a cylindrical shape extending toward the side. The upper side (upstream side) of the communication pipe 21B is larger in diameter than the lower side (downstream side). In other words, the upper side of the communicating pipe 21B protrudes radially outward from the lower side. The diameter of the upper side of the expanded communication pipe 21B is set to be larger than the diameter of the drainage portion 41, and the upper side of the expanded communication pipe 21B and the lower side of the communication pipe 21B are connected to each other. Connected.

A sealed water reservoir 21C is formed in the first drain trap 21 . The sealed water reservoir 21C is formed in a bucket-like shape with a bottom, and a first inclined portion 21G extending obliquely upward from the bottom portion 21D toward the downstream side and the first inclined portion 21G. A drain pipe 51 having a convex portion 23 convex upward is connected to a second inclined portion 21H having a portion extending obliquely downward as it goes downstream from the Water at a water level below the overflow portion 51AA, which is the vertex of the upwardly extending portion of the bottom wall of the portion 23, can be stored inside as sealed water. In addition, the drain pipe 51 is provided downstream of the second inclined portion 21H and extends so that the third flow path portion 21J extending in the horizontal direction extends along the floor slab 24 (see FIG. 1). In addition, a first siphon drain pipe 31 is connected to a portion near the water seal reservoir 21, that is, above the water seal reservoir 21C in the first inclined portion 21G. This makes it easy to accommodate the first siphon drain pipe 31 in the gap S between the bathtub 11 and the washing area 12 .

The first drain trap 21 is covered with an upper wall portion 21E except for the portion through which the communicating pipe 21B is inserted, and a drain 21F as an opening is formed in a part of the upper wall portion 21E. This drain 21F is normally covered with a movable lid 34, and when the liquid on the waterproof pan 38 flows onto the movable lid 34, the movable lid 34 moves downward (see the two-dot chain line in the figure). This liquid can flow into the first drain trap 21 .

As shown in FIG. 7, in the drainage structure 16, an apron 40 forming a side surface of the washing place 12 on the bathtub 11 side may be detachable. In this case, the drainage structure 16 can be easily maintained by removing the apron 40 .

(Actions and effects of the embodiment)
This embodiment is configured as described above, and the operation thereof will be described below. In FIG. 3, in the drainage structure 16 according to the present embodiment, the drainage from the bathtub 11 is drained after being stored, so compared to the drainage from the washing place 12, much drainage is drained at once. be done. Drainage from the bathtub 11 flows through the first drain trap 21, the upper horizontal pipe portion 51A, the vertical pipe portion 51B, and the lower horizontal pipe portion 51C of the drain pipe 51 to the first siphon drain pipe 31 (arrow A direction). Excess waste water flows into the first bypass pipe 18 (in the direction of arrow B) until a siphon force is generated in the first siphon drain pipe 31 . The air in the first bypass pipe 18 is pushed out toward the second drain trap 22 (in the direction of arrow C) as the drain water flows.

The first bypass pipe 18 is formed in an inverted U shape, and since the uppermost portion 18H of the pipe line is positioned above both the first drain trap 21 and the second drain trap 22, the water flows into the first bypass pipe 18. It is difficult for the drained water to flow toward the second drain trap 22 side. In particular, when the height position of the uppermost portion 18H of the first bypass pipe 18 is equivalent to the height position of the standard head H of the water stored in the bathtub 11, from the vertical pipe portion 18A Overflow to the vertical tube portion 18B is unlikely to occur. It should be noted that an overflow to the extent that the water seal of the second drain trap 22 is not broken may occur.

In FIG. 4, when a siphon force is generated in the first siphon drain pipe 31, the waste water from the bathtub 11 and the waste water flowing into the first bypass pipe 18 are rapidly discharged through the first siphon drain pipe 31 (arrow A direction), and the water level in the bathtub 11 decreases (direction of arrow D). At this time, outside air is taken into the first bypass pipe 18 from the intake valve 30 (in the direction of arrow E), so that negative pressure acting on the second drain trap 22 side is suppressed. Therefore, the water seal of the second drain trap 22 is not broken.

As described above, according to the drainage structure 16, it is possible to suppress the flooding of the drained water from the bathtub 11 into the washing area 12 without using a temporary storage tank as in the conventional art.

On the other hand, in FIG. 5, the drainage from the washing area 12 is continuous drainage without water storage. Drainage from the washing area 12 passes through the second drain trap 22 and flows through the upper horizontal pipe portion 52A, the vertical pipe portion 52B, and the lower horizontal pipe portion 52C of the drain pipe 52 to the second siphon drain pipe 32 (arrow F direction). The air in the first bypass pipe 18 is pushed out through the first bypass pipe 18 toward the first drain trap 21 (in the direction of arrow G), so that the washing area 12 is drained smoothly. Since there is almost no water head in the case of continuous drainage, the drainage does not flow into the vertical pipe portion 18B of the first bypass pipe 18 . When a siphon force is generated in the second siphon drain pipe 32, the waste water from the washing area 12 is rapidly discharged through the second siphon drain pipe 32 (in the direction of arrow F). At this time, if the water is drained only from the washing area 12, the first bypass pipe 18 will hardly have negative pressure. Since outside air is taken in from the intake valve 30, the water seals of the first drain trap 21 and the second drain trap 22 are not broken.

In FIG. 1 , in the siphon drainage system 10 according to the present embodiment, drainage from the bathtub 11 can flow to the drainage stack 14 through the horizontal pipe 31A and the vertical pipe 31B of the first siphon drainage pipe 31 . Moreover, in this siphon drainage system 10, the drainage from the washing place 12 can be flowed to the drainage stack 14 through the horizontal pipe 32A and the vertical pipe 32B of the second siphon drainage pipe 32.

As shown in FIG. 6, the first drain trap 21 includes a bottom portion 21D, a first inclined portion 21G extending obliquely upward from the bottom portion 21D, and a sealed water reservoir formed by the bottom portion 21D and the first inclined portion 21G. 21C, by which the seal water can be retained in the first drain trap 21. - 特許庁In addition, since the first bypass pipe 18 connecting the downstream portion of the first drain trap 21 and the downstream portion of the second drain trap 22 is provided above the sealed water reservoir 21C, it is not affected by the sealed water. Air can be accommodated between the bathtub 11 side and the washing place 12 side without any trouble. Therefore, even when there is a large amount of wastewater due to the accumulated wastewater, the wastewater can be smoothly drained without generating a negative pressure, so that the wastewater can be prevented from overflowing from the washing area 12.例文帳に追加This eliminates the need for a temporary water tank, making it possible to further lower the floor.

In addition, since the communicating pipe 21B is formed in a substantially cylindrical shape whose diameter increases from the downstream side to the upstream side, even when there is a large amount of wastewater at one time due to the accumulating drainage, the communication pipe 21B can smoothly flow downstream. can flow to

Furthermore, the first drain trap 21 has a drain 21F at a location other than the part that communicates with the drain part 41 of the bathtub 11. Since this drain 21F is open upward, the waterproof pan 38 and the like can be removed. Drainage other than the bathtub 11 can be drained to the first drainage trap 21 via the drain 21F.

As described above, according to the drainage structure 16 and the siphon drainage system 10 according to the present embodiment, a temporary storage tank unlike the conventional one is not required, so that the installation location of the bathtub 11 or the like in which water is accumulated and drained can be further reduced. Can be floored.

[Second embodiment]
In FIG. 8, the drainage structure 26 according to the present embodiment has auxiliary chambers 71 and 72 in at least one of, for example, both of the downstream portion of the first drainage trap 21 and the downstream portion of the second drainage trap 22. there is The auxiliary chamber 71 is provided downstream of the first drain trap 21 . The auxiliary chamber 72 is provided downstream of the second drain trap 22 .

The auxiliary chambers 71 and 72 are, for example, large diameter portions (inner diameter enlarged portions) provided in the drain pipes 51 and 52, respectively. The height dimension of the auxiliary chambers 71 and 72 is set smaller than that of the conventional temporary storage tank, and they are arranged in the space required for arranging the first drain trap 21, the second drain trap 22 and the drain pipes 51 and 52. be as large as possible. Therefore, no extra underfloor space is required for installation of the auxiliary chambers 71 and 72 .

In the illustrated example, both the auxiliary chambers 71 and 72 are arranged on the upstream side of the first bypass pipe 18, but one or both of the auxiliary chambers 71 and 72 are arranged on the downstream side of the first bypass pipe 18. may be placed.

In this drainage structure 26 , the auxiliary chambers 71 and 72 can receive excess drainage exceeding the capacity of the first bypass pipe 18 . When the water pumped up from the bathtub 11 (Fig. 1) is used in the washing place 12 (Fig. 1), a larger amount of water than usual is discharged from the washing place 12. - 特許庁Even in such a case, by receiving the waste water in the auxiliary chambers 71 and 72, the waste water from the washing place 12 can be prevented from becoming stagnant. In addition, it is possible to deal with a larger amount of accumulated and drained water from the bathtub 11. - 特許庁

Since other parts are the same as those of the first embodiment, the same parts are denoted by the same reference numerals in the drawings, and the description thereof is omitted.

[Third Embodiment]
9, in the drainage structure 36 according to the present embodiment, the first bypass pipe 18 is connected to a vent pipe 74 that replaces the intake valve 30 (FIG. 2). The ventilation pipe 74 extends, for example, to the outside of the building, and the end 74A is open to the atmosphere.

Since the drainage structure 36 is provided with the ventilation pipe 74 instead of the intake valve 30 (FIG. 2), the installation space for the intake valve 30 is not required.

When a siphon force is generated in the first siphon drain pipe 31, outside air is taken into the first bypass pipe 18 from the vent pipe 74, so the water seal of the second drain trap 22 is not broken. Even when a siphon force is generated in the second siphon drain pipe 32, outside air is taken into the first bypass pipe 18 from the vent pipe 74, so the water seal of the first drain trap 21 is not broken.

Since other parts are the same as those of the first embodiment, the same parts are denoted by the same reference numerals in the drawings, and the description thereof is omitted.

[Fourth Embodiment]
10, the drainage structure 46 according to this embodiment has other drainage traps 83, 84, siphon drainage pipes 93, 94, individual air pipes 103, 104, a header 80, and a combined air pipe 90. is doing.

Another drain trap 83 is provided for a drain (not shown) of a washing machine, which is an example of another water-related appliance. Another drain trap 84 is provided for a washbasin, which is an example of another plumbing appliance. The other drain traps 83 and 84 are so-called water-sealed traps for preventing backflow of foul odors, gases, and the like.

A drain pipe 113 is connected to the downstream side of the other drain trap 83 . The siphon drain pipe 93 is connected to the downstream side of the drain pipe 113 . A drain pipe 114 is connected to the downstream side of the other drain trap 84 . The siphon drain pipe 94 is connected to the downstream side of the drain pipe 114 .

One end of the individual vent pipe 103 is connected to a downstream portion (drain pipe 113 ) of the other drain trap 83 . Also, one end of the individual vent pipe 104 is connected to the downstream side portion (drain pipe 114) of the other drain trap 84. As shown in FIG. The other ends of the individual vent pipes 103 and 104 are connected to headers 80, respectively.

The header 80 is a pipe joint to which the vent pipe 74 and the individual vent pipes 103 and 104 are connected. The confluence trachea 90 is connected to the header 80 and open to the atmosphere. Specifically, the confluence trachea 90 extends to the outside of a building, for example, and the end 90A is open to the atmosphere.

In this drainage structure 46, the ventilation pipe 74 and the individual ventilation pipes 103, 104 are provided in place of the intake valve 30 (FIG. 2), so the installation space for the intake valve 30 is not required. Also, the vent pipe 74 and the individual vent pipes 103 and 104 are assembled in the header 80 and are open to the atmosphere through the combined vent pipe 90 . Therefore, it is not necessary to extend the vent pipe 74 and the individual vent pipes 103 and 104 to the outside. As a result, air can be sucked and exhausted all at once, and the number of parts can be reduced compared to the case where the vent pipe 74 and the individual vent pipes 103 and 104 are individually opened to the atmosphere.

Since other parts are the same as those of the first embodiment, the same parts are denoted by the same reference numerals in the drawings, and the description thereof is omitted.

[Reference example 1]
In FIG. 11 , in the drainage structure 56 according to this reference example, the first siphon drainage pipe 31 is connected to the downstream side of the drainage pipe 51 extending from the first drainage trap 21 . A second siphon drain pipe 32 is connected to the downstream side of the drain pipe 52 extending from the second drain trap 22 . That is, the drainage path from the first drainage trap 21 and the drainage path from the second drainage trap 22 are independent of each other.

Therefore, even if the first drainage trap 21 is drained, the drainage will not flow into the second drainage trap 22 side. For this reason, it is possible to prevent the accumulated wastewater from the bathtub 11 from overflowing into the washing area 12 (FIG. 1).

Since other parts are the same as those of the first embodiment, the same parts are denoted by the same reference numerals in the drawings, and the description thereof is omitted.

[Reference example 2]
In FIG. 12, a drainage structure 66 according to this reference example is provided with intake valves 111 and 112 in addition to the first reference example. A branch pipe 121 extending upward is connected to the drain pipe 51 . The intake valve 111 is provided at the upper end of the branch pipe 121 . A branch pipe 122 extending upward is connected to the drain pipe 52 . Also, the intake valve 112 is provided at the upper end of the branch pipe 122 . The configuration of the intake valves 111 and 112 is similar to that of the intake valve 30 of the first embodiment.

In this reference example, as in the first reference example, even if the first drain trap 21 is used to collect and drain water, the drain water does not flow into the second drain trap 22 side. For this reason, it is possible to prevent the accumulated wastewater from the bathtub 11 from overflowing into the washing area 12 (FIG. 1).

Since the intake valve 111 is added to the drain pipe 51 , outside air is taken in from the intake valve 111 when draining water from the first drain trap 21 . Further, since the intake valve 112 is added to the drain pipe 52 , outside air is taken in from the intake valve 112 when draining water from the second drain trap 22 . Therefore, both the drainage from the first drainage trap 21 and the drainage from the second drainage trap 22 are facilitated to flow.

Since other parts are the same as those of the first embodiment or the first reference example, the same parts are denoted by the same reference numerals in the drawings, and descriptions thereof are omitted.

[Fifth embodiment]
In FIG. 13, the drainage structure 86 according to this embodiment has a second bypass pipe 218 . The second bypass pipe 218 connects the first drain trap 21 side and the second drain trap 22 side of the first bypass pipe 18 at a position lower than the top of the first bypass pipe 18 . The bottom surface of the second bypass pipe 218 is positioned lower than the top surface 22A of the second drain trap 22 . The bottom surface of the second bypass pipe 218 is arranged higher than the bottom surface 52D of the upper horizontal pipe portion 52A of the drain pipe 52 .

The second bypass pipe 218 extends laterally, for example. Note that the second bypass pipe 218 may be inclined or curved with respect to the horizontal direction. In this way, when the height of the bottom surface of the second bypass pipe 218 is not constant, the highest position of the bottom surface is lower than the top surface 22A of the second drain trap 22 and the upper horizontal pipe portion 52A. It is arranged higher than the bottom surface 52D.

A first check valve 19 is provided at, for example, a connecting portion 18</b>D of the first bypass pipe 18 . The first check valve 19 is configured to allow flow from the side of the second drain trap 22 to the side of the first drain trap 21 and not allow flow on the opposite side. The position of the first check valve 19 is not limited to the connection portion 18D, and may be provided, for example, in the vertical pipe portion 18B. Also, the first check valve 19 may be configured to allow a certain amount of flow from the first drain trap 21 side to the second drain trap 22 side.

A second check valve 219 is provided in the second bypass pipe 218 . The second check valve 219 is configured to allow flow from the second drain trap 22 side to the first drain trap 21 side and not allow flow on the opposite side. The second check valve 219 may be configured to allow a certain amount of flow from the first drain trap 21 side to the second drain trap 22 side.

Even if the drainage from the washing area 12 does not completely enter the second drainage trap 22 and the second drainage trap 22 is filled with water, according to this embodiment, excess drainage passes through the second bypass pipe 218 and the vertical pipe portion 51B of the drainage pipe 51. , and the lower horizontal pipe portion 51C to the first siphon drain pipe 31 (FIG. 1) (in the direction of arrow H). In this embodiment, the bottom surface of the second bypass pipe 218 is arranged higher than the bottom surface 52D of the upper horizontal pipe portion 52A of the drain pipe 52 . Therefore, the drainage from the washing place 12 does not always flow to the second bypass pipe 218, and the second siphon drainage pipe 32 is quickly filled up, so that the activation of the siphon is not delayed.

Further, in this embodiment, the bottom surface of the second bypass pipe 218 is positioned lower than the top surface 22A of the second drain trap 22 . Therefore, when the waste water is about to overflow from the second waste water trap 22, the waste water flows to the second bypass pipe 218, so that the waste water from overflowing from the second waste water trap 22 can be suppressed.

Furthermore, since the second bypass pipe 218 is provided with the second check valve 219, the flow from the first drain trap 21 side to the second drain trap 22 side through the second bypass pipe 218 is suppressed. In addition, since the connection portion 18D of the first bypass pipe 18 is provided with the first check valve 19, when draining water from the bathtub 11, the water is discharged from the first drain trap 21 through the first bypass pipe 18 to the second drain trap. The flow to the 22 side, that is, the overflow from the vertical pipe portion 18A to the vertical pipe portion 18B is more difficult to occur.

Since other parts are the same as those of the first embodiment, the same parts are denoted by the same reference numerals in the drawings, and the description thereof is omitted.

[Sixth embodiment]
In FIG. 14, a drainage structure 76 according to this embodiment has a configuration in which the first check valve 19 of the first bypass pipe 18 in the fifth embodiment is omitted. In the first bypass pipe 18, as described in the first embodiment, by appropriately setting the height of the uppermost portion 18H, overflow occurs between the vertical pipe portions 18A and 18B of the first bypass pipe 18. You can avoid it. Therefore, by omitting the first check valve 19 as in the present embodiment, the configuration can be simplified and the cost can be reduced.

[Seventh Embodiment]
In FIG. 15, the drainage structure 130 according to this embodiment has a first drainage trap 132 . The first drain trap 132 is provided on the downstream side of the drain section 41 and has a tubular shape.

A first siphon drain pipe 31 is connected to the downstream side of the first drain trap 132 . In other words, the first drain trap 132 has a structure in which the drain pipe 51 in the first embodiment is integrated.

The upper side (upstream side) of the opening of the first drain trap 132 on the bathtub 11 side is larger in diameter than the lower side (downstream side). In other words, the opening of the first drain trap 132 on the bathtub 11 side protrudes radially outward with respect to the other portions. Further, as shown in FIG. 16(A), the general drain pipe 51 has a diameter smaller than that of the first drain trap 21 . On the other hand, as shown in FIG. 16B, the diameter of the first drain trap 132 of the present embodiment is the vicinity of the bathtub 11, i. The diameter dimension close to the dimension is set so as to continue downstream substantially constantly, and is set to be thicker than the general drainage pipe 51 .

As shown in FIG. 15, the first drain trap 132 is formed with a water sealing reservoir 132A. Specifically, the first drain trap 132 includes a first inclined portion 132G extending obliquely upward from a bottom portion 132E of the first drain trap 132, and a second inclined portion 132G provided downstream of the first inclined portion 132G. A convex portion 133 is formed by the inclined portion 132H and a third flow path portion 132J provided downstream of the second inclined portion 132H and horizontally extending to the floor slab 24 (see FIG. 1). . The second inclined portion 132H is provided at a horizontally extending portion adjacent to the first inclined portion 132G extending obliquely upward from the bottom portion 132A, and downstream from the horizontally extending portion. and a portion extending obliquely downward. That is, the first drain trap 132 has a convex portion 133 facing upward. A sealing water reservoir 132A is formed in the convex portion 133 on the side of the first inclined portion 132G.

A first trap wall 132C is formed at an overflow portion 132B, which is the vertex of a portion of the protrusion 133 of the first drain trap 132 that extends upward from the bottom portion 132E. The first trap wall 132C protrudes upward from the overflow portion 132B while the direction from the upstream side to the downstream side is the plate thickness direction.

On the other hand, a second trap wall 132D is formed in an upper portion 132F of the first drain trap 132 upstream of the overflow portion 132B. The second trap wall 132D protrudes downward from the upper portion 132F while defining the direction from the upstream side to the downstream side as the plate thickness direction. The amount of protrusion of each of the first trap wall 132C and the second trap wall 132D is set to such an extent that the required amount of sealing water can be secured.

The first bypass pipe 18 is connected to a portion of the protrusion 133 of the first drain trap 132 above the water seal pool 132A. Specifically, it is connected to the first inclined portion 132</b>G of the convex portion 133 of the first drain trap 132 .

In this embodiment, since the basic configuration is the same as that of the first embodiment, it is possible to obtain the same effects as those of the first embodiment. Further, since the first drain trap 132 is integrated with the drain pipe 51 in the first embodiment, the structure can be simplified and the cost can be reduced.

Further, as shown in FIG. 16(B), since the portion downstream of the first drain trap 132 is set to be thicker than the general drain pipe 51, the portion where the second trap wall 132D is formed The area of the flow path S can be made larger than that of the flow path S (see FIG. 16A) in a pipe of general thickness. As a result, clogging can be suppressed.

[Eighth embodiment]
In FIG. 17, the drainage structure 140 according to the present embodiment is a portion in which the first bypass pipe 18 in the seventh embodiment extends obliquely downward toward the downstream side of the convex portion 133 of the first drainage trap 132. is connected to the second inclined portion 132H. Specifically, the second inclined portion 132H includes a horizontally extending portion adjacent to the first inclined portion 132G extending obliquely upward from the bottom portion 132A, and a horizontally extending portion. A second inclined portion in the convex portion 133 that is formed in a convex shape upward by the first inclined portion 132G and the second inclined portion 132H. A first bypass pipe 18 is connected to a position above the water seal reservoir 132A at 132H. Therefore, the first bypass pipe 18 is connected to the first drain trap 132 at a position away from the sealed water reservoir 132A. That is, since the first bypass pipe 18 can be connected to the first drain trap 132 at a place where there is room in the space other than the place where the sealed water reservoir 132A is located in the underfloor space, it is possible to improve the routing of the pipe. .

In addition, the first bypass pipe 18 is connected to the downstream portion of the protrusion 133 of the first drain trap 132 that extends obliquely downward toward the downstream side, so that the upstream inside the first drain trap 132 Drainage and air flowing from the side to the downstream side can easily enter the first bypass pipe 18 . Therefore, excess drainage from the bathtub 11 can be quickly absorbed by the first bypass pipe 18 until the siphon force is generated in the first siphon drain pipe 31 .

In the present embodiment, the first bypass pipe 18 is connected to the second inclined portion 132H of the first drain trap 132. However, the present invention is not limited to this, and the downstream side of the second inclined portion 132H in the first bypass pipe 18 may be connected to a third flow path portion 132J provided in and extending in the horizontal direction.

[Other embodiments]
An example of the embodiment of the present invention has been described above, but the embodiment of the present invention is not limited to the above, and can be modified in various ways without departing from the spirit of the present invention. Of course there is.

Although the bathtub 11 is given as an example of the first water-related equipment, the first water-related equipment may be a device such as a washing machine that collects and drains the waste water. In addition, although the washing place 12 is given as an example of the second water-related equipment, the second water-related equipment may be a device such as a washstand, a kitchen, a dishwasher, etc., in which drainage is continuously discharged.

Although the drain pipe 51 is mentioned as an example of the downstream portion of the first drain trap 21 to which the first bypass pipe 18 is connected, the downstream portion is not limited to this. Similarly, although the drain pipe 52 was mentioned as an example of the downstream portion of the second drain trap 22 to which the first bypass pipe 18 is connected, the downstream portion is not limited to this. For example, the first bypass pipe 18 may be directly connected to at least one of the first drain trap 21 and the second drain trap 22 .

Although the first bypass pipe 18 is provided with the intake valve 30, the intake valve 30 may be omitted if the water seals of the first drain trap 21 and the second drain trap 22 are not broken.

DESCRIPTION OF SYMBOLS 10...Siphon drainage system, 11...Bathtub (first water-related apparatus), 12...Washing place (second water-related apparatus), 14...Drainage stack, 16...Drainage structure , 18...Bypass pipe, 19...First check valve, 21...First drain trap, 21B...Communicating pipe (portion corresponding to the drain part of the first plumbing fixture), 21C 21D bottom portion 21F drain (opening) 21G first slope portion 21H second slope portion 21J third channel portion 22... Second drainage trap, 23... Convex part (part extending obliquely upward), 26... Drainage structure, 30... Intake valve, 31... First siphon drain pipe, 31A...horizontal pipe, 31B...vertical pipe, 32...second siphon drainage pipe, 32A...horizontal pipe, 32B...vertical pipe, 36...drainage structure, 41... Drainage part 42 Drainage part 46 Drainage structure 52 Drainage pipe 52D Bottom surface 56 Drainage structure 66 Drainage structure 71 Auxiliary Chamber 72 Auxiliary chamber 74 Vent pipe 76 Drainage structure 80 Header 83 Other drainage trap 84 Other drainage trap 86 Drainage structure 90 Combined trachea 93 Siphon drainage pipe 94 Siphon drainage pipe 103 Individual ventilation pipe 104 Individual ventilation pipe 130 Drainage structure , 132... First drainage trap, 132A... Sealed water reservoir, 132E... Bottom part, 132G... First inclined part, 132H... Second inclined part, 132J... Third channel part , 133... Convex portion (part extending obliquely upward), 140... Drainage structure, 218... Second bypass pipe, 219... Second check valve

Claims (13)

a first water-related device, in which the waste water is stored and drained after the water is stored;
a second water-related device in which the drainage is continuous drainage without stored water;
A bottom portion provided in the drainage portion of the first water-related appliance, a first inclined portion extending obliquely upward from the bottom portion, and a sealed water reservoir formed by the bottom portion and the first inclined portion. a first drain trap comprising;
a second drainage trap provided in the drainage part of the second water-related equipment;
a first siphon drain pipe connected to the downstream side of the first drain trap;
a second siphon drain pipe connected downstream of the second drain trap;
a first bypass pipe that connects a downstream portion of the first drain trap and a downstream portion of the second drain trap above the sealed water reservoir;
has
The first drain trap includes a second inclined portion provided downstream of the first inclined portion and having a portion extending obliquely downward, and a second inclined portion provided downstream of the second inclined portion and horizontally and a third flow path portion extending to
The drainage structure , wherein the first bypass pipe is connected to the second inclined portion or the third flow path portion of the first drainage trap . a first water-related device, in which the waste water is stored and drained after the water is stored;
a second water-related device in which the drainage is continuous drainage without stored water;
A bottom portion provided in the drainage portion of the first water-related appliance, a first inclined portion extending obliquely upward from the bottom portion, and a sealed water reservoir formed by the bottom portion and the first inclined portion. a first drain trap comprising;
a second drainage trap provided in the drainage part of the second water-related equipment;
a first siphon drain pipe connected to the downstream side of the first drain trap;
a second siphon drain pipe connected downstream of the second drain trap;
a first bypass pipe that connects a downstream portion of the first drain trap and a downstream portion of the second drain trap above the sealed water reservoir;
has
A drainage structure in which a portion of the first drainage trap corresponding to the drainage portion of the first water-related equipment is formed in a substantially cylindrical shape, and the upstream side is enlarged in diameter with respect to the downstream side. a first water-related device, in which the waste water is stored and drained after the water is stored;
a second water-related device in which the drainage is continuous drainage without stored water;
A bottom portion provided in the drainage portion of the first water-related appliance, a first inclined portion extending obliquely upward from the bottom portion, and a sealed water reservoir formed by the bottom portion and the first inclined portion. a first drain trap comprising;
a second drainage trap provided in the drainage part of the second water-related equipment;
a first siphon drain pipe connected to the downstream side of the first drain trap;
a second siphon drain pipe connected downstream of the second drain trap;
a first bypass pipe that connects a downstream portion of the first drain trap and a downstream portion of the second drain trap above the sealed water reservoir;
has
The drainage structure, wherein the first drainage trap has an upwardly opening portion other than a portion communicating with the drainage portion of the first water-related equipment. At least part of the first bypass pipe is located above both the first drain trap and the second drain trap,
The drainage structure according to any one of claims 1 to 3 . The first bypass pipe is provided with a first check valve that allows flow from the second drainage trap side to the first drainage trap side and does not allow flow on the opposite side.
The drainage structure according to any one of claims 1 to 4 . The drainage structure according to any one of claims 1 to 5 , wherein the first bypass pipe is provided with an intake valve. The drainage structure according to any one of claims 1 to 5 , wherein a vent pipe is connected to the first bypass pipe. other drainage traps provided for other plumbing fixtures;
a siphon drain pipe connected downstream of the other drain trap;
a separate vent pipe connected downstream of the other drain trap;
a header to which the vent pipe and the individual vent pipe are connected;
a confluent trachea connected to the header and open to the atmosphere;
The drainage structure according to claim 7 . The first drain trap side and the second drain trap side of the first bypass pipe are connected at a position lower than the top of the first bypass pipe, and the bottom surface of the pipeline is lower than the top surface of the second drain trap. having a second bypass pipe located low;
The drainage structure according to any one of claims 1 to 8 . Having a drain pipe connecting the second drain trap and the second siphon drain pipe,
The bottom surface of the conduit in the second bypass pipe is arranged higher than the bottom surface of the drain pipe,
The drainage structure according to claim 9 . The second bypass pipe is provided with a second check valve that allows flow from the second drain trap side to the first drain trap side and does not allow flow on the opposite side.
The drainage structure according to claim 9 or 10 . an auxiliary chamber at least one of the downstream portion of the first drain trap and the downstream portion of the second drain trap;
The drainage structure according to any one of claims 1 to 11 . A drainage stack arranged in the upper and lower direction of the building,
and a drainage structure according to any one of claims 1 to 12 ,
The first siphon drain pipe and the second siphon drain pipe each have a horizontal pipe for draining wastewater in a horizontal direction, and a vertical pipe connected to the vertical drain pipe for downwardly draining the wastewater from the horizontal drain pipe. Siphonic drainage system.

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