JP7299715B2 - Drainage structure and siphon drainage system - Google Patents

Description

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

In a siphon drainage system, a structure is disclosed in which pipes for draining water from two water-related devices (a kitchen sink and a dishwasher) are connected to a single horizontal pipe (see Patent Document 1). The plumbing of the kitchen sink is connected to the upstream end of the transverse pipe. The pipe of the dishwasher is connected downstream from the upstream end of the horizontal pipe. The connecting part of the pipe of the dishwasher and the horizontal pipe is the confluence part where the drainage from the kitchen sink and the drainage from the dishwasher join.

JP 2016-196744 A

However, when waste water flows from one of the water-related devices (for example, the dishwasher), the air from the one water-related device to the junction flows into the piping of the other water-related device (for example, the kitchen sink), The pressure in the pipe may increase, causing a problem that the water seal of the drain trap is lost (seal is broken).

As a countermeasure, it is conceivable to reduce the volume of the piping from one of the water-related devices (dishwasher) to the confluence by bringing the two water-related devices as close as possible, but the installation layout of the water-related devices is free. may lead to a decrease in degree.

An object of the present invention is to increase the degree of freedom in the layout of installation of two plumbing equipment.

A drainage structure according to a first aspect includes two plumbing devices, a pipe connected to the downstream side of a drainage trap provided in each of the plumbing devices, and the pipes being connected to the upstream ends, A horizontal pipe for laterally flowing the wastewater flowing through the pipe from the water-related equipment, and an air-stagnation suppressing part provided in one of the pipes on the side of the water-related equipment and suppressing air accumulation in the pipe. and wherein the horizontal flow path length of the pipe from the drain trap on one of the water-related equipment sides to the connecting portion to the horizontal pipe is the same as the drain trap on the other water-related equipment side. to the connecting portion to the horizontal pipe is set to be longer than the lateral channel length of the pipe.

In this drainage structure, the horizontal flow path length of the pipe from the drainage trap on the side of one of the water-related equipment to the connection to the horizontal pipe is equal to that of the connection from the drainage trap to the horizontal pipe of the other water-related equipment. It is set longer than the horizontal flow path length of the piping up to An air retention suppressing portion is provided in the piping on one side of the water-related equipment. Therefore, when drain water is discharged from the water-related equipment, the sealing water is broken in the drainage trap of the other water-related equipment due to the pressure increase of the piping on the side of the other water-related equipment having a short flow path length. is suppressed. Therefore, it is possible to increase the length of the pipe from the side of the water-related equipment to the horizontal pipe, and separate the installation positions of the two water-related equipment from each other.

A second aspect is a water sealing structure, in the drainage structure according to the first aspect, in which the inside of the pipe is filled with water when the one water-related device is not draining water as the air-stagnation suppressing portion. have.

This drainage structure has a water sealing structure as an air retention suppressing portion. In this water sealing structure, the inside of the pipe is filled with water when water is not drained from one of the water-related devices, so formation of air pockets inside the pipe is suppressed. This water may be leftover water from one of the water-related devices, or may be water supplied into the pipe from the outside. By filling the inside of the pipe with water, the amount of air remaining inside the pipe can be suppressed. Therefore, when draining water from one of the water-related devices, it is possible to prevent air from flowing into the pipe on the side of the other water-related device.

A third aspect is the drainage structure according to the second aspect, wherein the water sealing structure is provided between the plumbing equipment on the side having the water sealing structure and the connecting portion, It is configured by going down once, going up, and going down again.

In this drainage structure, in the water sealing structure, the flow path of the piping is configured to once go down, go up, and go down again from the water-related equipment on the side having the water sealing structure to the connection part, so it is simple. With such a structure, the inside of the pipe can be filled with water.

A fourth aspect is the drainage structure according to the third aspect, wherein in the water sealing structure, an inclined portion inclined obliquely with respect to the horizontal direction is provided in a portion where the flow path rises and falls.

In this drainage structure, an inclined portion obliquely inclined with respect to the horizontal direction is provided in the portion where the flow path rises and falls in the water sealing structure, so that an air pool is less likely to be formed.

A fifth aspect is the drainage structure according to the third aspect or the fourth aspect, wherein a horizontal portion is provided between the flow path of the pipe in the water sealing structure and the passage from when it is once lowered to when it is raised, and the horizontal portion is superimposed above the laterally drawn pipe and extends along the laterally drawn pipe.

In this drainage structure, since the horizontal portion of the water sealing structure is provided over the horizontal pipe and extends along the horizontal pipe, it is easy to secure the installation space for the pipe. Therefore, relatively long piping on one side of the water-related equipment can be arranged without difficulty.

A sixth aspect is the drainage structure according to any one of the second to fifth aspects, wherein a cleaning port is provided in a portion of the pipe having the water sealing structure that does not constitute the water sealing structure. .

In this drainage structure, since the pipe having the water sealing structure is provided with the cleaning port, the pipe can be easily cleaned as necessary.

A seventh aspect is the drainage structure according to any one of the second to sixth aspects, wherein the pipe on the other plumbing equipment side is provided with a pressure buffering portion, and the pressure buffering portion The allowable capacity is the total volume from the downstream end of the water sealing structure in the pipe on the one water-related device side to the connection position of the pressure buffer portion in the pipe on the other water-related device side. is also big.

In this drainage structure, a pressure buffer is provided in the pipe on the side of the water-related equipment on the other side, and its allowable capacity is appropriately set. Even if the air from the side end to the connecting position of the pressure buffering portion in the piping on the other plumbing device side flows into the piping on the other plumbing device side, the air can be received by the pressure buffering portion. . As a result, it is possible to suppress an increase in pressure in the pipe, and to suppress breakage of the sealing water in the drain trap on the side of the other plumbing equipment.

A siphon drainage system according to an eighth aspect includes a drainage stack arranged in the vertical direction of a building, a drainage structure according to any one aspect of the first to seventh aspects, and a drainage stack connected to the drainage stack. and a vertical pipe for flowing downward the drainage from the horizontal pipe.

With this siphon drainage system, it is possible to provide a drainage system with a higher degree of freedom in the installation layout of two plumbing devices.

According to the drainage structure and the siphon drainage system according to the present invention, it is possible to increase the degree of freedom in the installation layout of two plumbing devices.

It is a top view which shows the kitchen system provided with the drainage structure which concerns on this embodiment. (A) is a cross-sectional view showing a siphon drainage system according to the present embodiment. (B) is an enlarged cross-sectional view taken along the line 2B-2B in FIG. 2(A), showing the positional relationship between the pipe and the horizontal pipe. FIG. 5 is a cross-sectional view showing a siphon drainage system having a drainage structure according to a modification; FIG. 10 is a cross-sectional view showing a siphon drainage system having a drainage structure according to another modification; FIG. 10 is a cross-sectional view showing a siphon drainage system having a drainage structure according to another modification; 6 is an enlarged cross-sectional view taken along line 6-6 in FIG. 5, showing a drainage structure according to another modification. FIG.

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments for carrying out the present invention will be described based on the drawings. In FIG. 1, a drainage structure 10 according to the present embodiment is part of a siphon drainage system 12 and is used for draining water from a kitchen system 13, for example.

The kitchen system 13 includes a gas stove 18, a dishwasher 21 as an example of water-related equipment, and a kitchen sink sink 22 as an example of water-related equipment. The kitchen system 13 is a so-called L-shaped kitchen, and the direction of the sink 22 is arranged at right angles to the directions of the gas stove 18 and the dishwasher 21 . In other words, the gas stove 18 and the dishwasher 21 are arranged along the wall 11 and the sink 22 is arranged away from the wall 11 . As a result, the distance between the sink 22 and the dishwasher 21 is greater than when the sink 22 and the dishwasher 21 are arranged side by side.

As shown in FIG. 2A, the dishwasher 21 and the sink 22 are installed above the floor slab 24 on each floor of the building 15 . The siphon drainage system 12 includes a drainage stack 14 , a drainage structure 10 and a shaft 16 .

The drainage stack 14 is arranged in the vertical direction of the building and penetrates through holes 25 of the floor slab 24 of the building 15 . The drainage stack 14 is provided with a drainage joint 26 that connects the vertical pipe 16 .

The vertical pipe 16 is a pipe that is connected to the vertical drainage pipe 14 and allows the drainage from the horizontal pipe 28 to flow downward, and its upper end is connected to the downstream end of the horizontal pipe 28 . A lower end of the vertical pipe 16 is connected to a drain joint 26 . As a result, the waste water discharged from the water-related appliances such as the dishwasher 21 and the sink 22 and flowed into the vertical pipe 16 through the horizontal pipe 28 is combined with the drainage stack pipe 14. - 特許庁

It should be noted that in the drawings, the configurations of connecting portions of pipes, such as pipe joints, are appropriately omitted or simplified.

In FIG. 2(A), the drainage structure 10 includes a dishwasher 21 and a sink 22 as two water-related devices, pipes 31 and 32, a horizontal pipe 28, and a water sealing structure 34 as an air accumulation suppressor. and

The pipes 31 and 32 are connected downstream of drain traps 41 and 42 provided in the dishwasher 21 and the sink 22, respectively. Specifically, the pipe 31 is connected downstream of a drain trap 41 provided in the dishwasher 21 . Further, the pipe 32 is connected to the downstream side of a drain trap 42 provided in the sink 22 and extends downward.

The drain traps 41 and 42 are so-called water-sealed traps for preventing backflow of foul odors, gases, and the like. The drain trap 41 is built in the dishwasher 21, for example. The drain trap 42 is, for example, an S-shaped trap connected to the drain of the sink 22 . The types of the drain traps 41 and 42 are arbitrary, and cup-type traps or the like may be used.

A vent valve 44 is attached to, for example, the upper end of the drain trap 42 (above the pipe 32). The vent valve 44 is a component for allowing air from the outside to pass to the drain trap 42 and for preventing the passage of water and air from the drain trap 42 to the outside.

The horizontal pipe 28 is a pipe to which the pipes 31 and 32 are connected to an upstream end 28A, respectively, and which flows laterally the waste water flowing through the pipes 31 and 32 from the plumbing equipment. Specifically, the downstream end of the pipe 31 and the downstream end of the pipe 32 are connected to the upstream end 28A of the transverse pipe 28, respectively. In the example shown in FIG. 2(A) , the connecting portion 31A of the pipe 31 is connected to the downstream side of the connecting portion 32A of the pipe 32 at the upstream end portion 28A of the transverse pipe 28 . As an example, the connecting portion 31A is arranged below a pressure buffering portion 36, which will be described later. It is desirable that the length of the flow path between the connecting portions 31A and 32A at the upstream end portion 28A of the horizontal pulling pipe 28 is as short as possible. This is because the shorter the channel length, the more it is possible to suppress the formation of air pockets between the connecting portions 31A and 32A.

Note that the connection portion 31A of the pipe 31 may be arranged upstream of the connection portion 32A of the pipe 32 . Although illustration is omitted, for example, the connecting portion 31A of the pipe 31 may be connected to the upstream side of the connecting portion 32A of the pipe 32 and to the downstream side of the pressure buffering portion 36, which will be described later.

A pressure buffer 36 is provided in the pipe 32 on the sink 22 side. This pressure buffering part 36 is a component for relaxing the pressure acting on the drain trap 42 through the pipe 32 . It communicates with the pipe 32 and has an elastically expandable and contractible bag inside (not shown). The bag body is configured to elastically deform and swell when receiving a positive pressure from the downstream end of the pipe 32 so as to relieve the pressure generated on the downstream side.

The water sealing structure 34 is provided in the pipe 31 on the dishwasher 21 side and suppresses air accumulation in the pipe 31 . Here, the horizontal flow path length from the drain trap 41 to the connecting portion 31A to the horizontal pipe 28 in the pipe 31 is the horizontal direction length from the drain trap 42 to the connecting portion 32A to the horizontal pipe 28 in the pipe 32. longer than the channel length. Air pockets are likely to form in the relatively long pipe 31 , so the pipe 31 is provided with a water sealing structure 34 to suppress the formation of air pockets inside the pipe 31 .

The water sealing structure 34 is configured so that the inside of the pipe 31 is filled with water when the dishwasher 21 is not draining water. This water may be leftover water from the dishwasher 21 or may be water supplied into the pipe 31 from the outside.

Specifically, the water sealing structure 34 is configured such that the flow path of the pipe 31 once descends from the dishwasher 21 to the connecting portion 31A, ascends, and descends again. Here, the part where the channel descends obliquely downward once from the drainage trap 41 is called a descending part 34A, the part where the channel rises is called an ascending part 34C, and the part where the channel descends again is called a re-descending part 34E. A horizontal portion 34B, for example, is provided between the passage of the pipe 31 in the water sealing structure 34 once lowered and raised, that is, between the descending portion 34A and the ascending portion 34C. Thus, the water sealing structure 34 is configured in a U-shaped trap shape. If the pipe 31 does not have a re-descending portion 34E that descends again after going up and directly merges with the pipe on the downstream side, the pipe 31 will join the pipe 32 on the side of the sink 22 that extends in the vertical direction. , the waste water from the sink 22 side can easily flow into the pipe 31 . In particular, when the pressure inside the pipe 31 fluctuates, the inflow becomes easier. Since the pipe 31 merges with the horizontal pipe 28 from above by the re-lowering portion 34E, the waste water of the horizontal pipe 28 does not flow into the pipe 31 and the waste water from the sink 22 side does not flow. Pressure fluctuations in the piping 31 on the vessel 21 side are less likely to occur.

Since the horizontal portion 34B is filled with water, it is possible to reduce the area in which air pockets are formed in the pipe 31 by bringing the connecting portion 31A closer to the connecting portion 32A and setting the range of the horizontal portion 34B larger. For this reason, the connecting portions 31A and 32A are arranged at the upstream end portion 28A of the horizontal pulling pipe 28, respectively.

A horizontal portion 34D is also provided between the rising portion 34C and the re-falling portion 34E until the flow path descends again. It should be noted that the horizontal portion 34D may be shortened or eliminated so that waste water immediately flows from the ascending portion 34C to the re-descending portion 34E. As a result, the air in the piping of the horizontal portion 34D can be lost.

As shown in FIG. 2(B), the horizontal portion 34B is provided over the horizontal pipe 28 and extends along the horizontal pipe 28. As shown in FIG. The horizontal portion 34B is arranged above the horizontal draw pipe 28 with a proper space therebetween by a support member (not shown).

In FIG. 2A, the allowable capacity of the pressure buffer 36 is from the downstream end A of the water sealing structure 34 in the pipe 31 on the side of the dishwasher 21 to the connection of the pressure buffer 36 in the pipe 32 on the sink 22 side. Greater than the sum of the volumes up to position B. The downstream end A is the downstream end of the region where the inside of the pipe 31 is filled with water in the water sealing structure 34 . In other words, the downstream end A corresponds to the height of the liquid level L of the sealing water on the downstream side of the water sealing structure 34 . Also, "from the downstream end A to the connection position B" means the section AB.

(action)
This embodiment is configured as described above, and the operation thereof will be described below. In FIG. 2A, in the drainage structure 10 and the siphon drainage system 12 according to the present embodiment, the lateral flow of the pipe 31 from the drain trap 41 on the side of the dishwasher 21 to the connecting portion 31A to the horizontal pipe 28 The path length is longer than the lateral path length of the pipe 32 from the drain trap 42 on the side of the sink 22 to the connecting portion 32B to the lateral pipe 28 . A water sealing structure 34 as an air retention suppressor is provided in the pipe 31 on the dishwasher 21 side.

In the water sealing structure 34, the inside of the pipe 31 is filled with water (liquid level L) when the dishwasher 21 is not draining water. At least the horizontal portion 34B is completely filled with water. By filling the inside of the pipe 31 with water in this way, the formation of air pockets inside the pipe 31 is suppressed, and the amount of air remaining inside the pipe 31 is suppressed. Therefore, when draining water from the dishwasher 21, it is possible to prevent air remaining in the pipe 31 on the side of the dishwasher 21 from flowing into the pipe 32 on the side of the sink 22, which has a short flow path length. Therefore, breakage of sealing water in the drain trap 42 on the side of the sink 22 due to pressure rise in the pipe 32 is suppressed.

Also, in the water sealing structure 34, the flow path of the pipe 31 once descends, rises, and descends again from the water-related equipment on the side having the water sealing structure 34, that is, the dishwasher 21 to the connection portion 31A. It is configured. Specifically, a descending portion 34A, a horizontal portion 34B, an ascending portion 34C, a horizontal portion 34D and a re-descending portion 34E are provided in this order between the dishwasher 21 and the connecting portion 31A. With such a simple U-shaped trap configuration, the inside of the pipe 31 can be filled with water. In addition, the presence of the horizontal portion 34B makes it possible to extend the distance of the pipe 31 in the horizontal direction while keeping the inside of the pipe 31 dense, thereby increasing the degree of freedom in layout of the plumbing equipment.

Furthermore, as shown in FIGS. 2A and 2B, the horizontal portion 34B of the water sealing structure 34 is provided above the horizontal pipe 28 and extends along the horizontal pipe 28. , the installation space for the pipe 31 can be easily secured. Therefore, the relatively long pipe 31 on the dishwasher 21 side can be arranged without difficulty.

In addition, since the pipe 32 on the side of the sink 22 is provided with a pressure buffering portion 36 and its allowable capacity is appropriately set, the downstream end A of the water sealing structure 34 is to the connecting position B (section AB) of the pressure buffering portion 36 in the pipe 32 on the sink 22 side flows into the pipe 32 on the sink 22 side, the air can be received by the pressure buffering portion 36. . As a result, the pressure increase in the pipe 32 can be suppressed, and the seal breakage of the water trap 42 on the sink 22 side can be suppressed.

As described above, according to the drainage structure 10 and the siphon drainage system 12 according to the present embodiment, the length of the pipe 31 from the side of the dishwasher 21 to the horizontal pipe 28 is set large, and the dishwasher 21 and the sink are 22 installation positions can be separated from each other. Therefore, it is possible to increase the degree of freedom in the installation layout of the two plumbing devices. As shown in FIG. 1, it can also be applied to an L-shaped kitchen in which the sink 22 and the dishwasher 21 are separated.

(Modification)
This embodiment can also be configured as the following modified example. In the example shown in FIG. 3, the water sealing structure 34 is provided with an inclined portion 34F inclined obliquely with respect to the horizontal direction where the flow path rises and falls. Specifically, an inclined portion 34F is provided instead of the rising portion 34C that extends vertically in FIG. 2(A). In this example, since the inclined portion 34F that is inclined with respect to the horizontal direction is provided in the portion where the flow path rises and falls in the water sealing structure 34, the air can easily flow from the horizontal portion 34B to the inclined portion 34F. , air pockets are less likely to be formed in the horizontal portion 34B.

In the example shown in FIG. 4, a cleaning port 46 is provided in a portion of the pipe 31 having the water sealing structure 34 that does not constitute the water sealing structure 34, that is, a portion that is not filled with water. Specifically, the portion corresponding to the descending portion 34A in FIG. 2A is replaced with a horizontal portion 34G connected to the drain trap 42 and a descending portion 34H connected to the downstream end of the horizontal portion 34G. . A cleaning port 46 is provided at the upper end of the descending portion 34H. Although not shown, the cleaning port 46 has an opening and a detachable lid capable of closing the opening. When cleaning the pipe 31 , it is possible to remove the cover of the cleaning port 46 and insert a cleaning tool into the pipe 31 .

In this example, since the pipe 31 having the water sealing structure 34 is provided with the cleaning port 46, the pipe 31 can be easily cleaned as necessary.

In the examples shown in FIGS. 5 and 6, unlike the examples shown in FIGS. 1 to 4, the positions of the dishwasher 21 and the sink 22 are reversed on the left and right, and the pipes 31 and 32 intersect. In this case, since the pipe 32 interferes with the inclined portion 34F or the horizontal portion 34D, the inclined portion 34F or the horizontal portion 34D is arranged to avoid the pipe 32 as shown in FIG.

The pipe 32 with the pressure buffering portion 36 is connected to the upstream side of the lateral pipe 28 . Since the pipe 31 without the pressure buffer 36 is susceptible to the air in the pipe 32 with the pressure buffer 36, it must be connected to the downstream side of the horizontal pipe 28 without fail. Although this imposes restrictions on the layout of the plumbing equipment, it is possible to increase the degree of freedom in the layout of the plumbing equipment by using the pipe connection structure of this modified example.

[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.

In the above embodiment, the dishwasher 21 and the sink 22 are provided as two plumbing appliances, but other plumbing appliances may be provided. In that case, the piping of other plumbing equipment may be connected to the upstream end of the lateral pipe 28, and the piping may be provided with an air-stagnation suppressor as necessary.

Although the water sealing structure 34 is given as an example of the air retention suppressing portion, a pressure buffering portion capable of receiving air remaining in the pipe 31 may be provided (not shown). In that case, the water sealing structure 34 suppresses the formation of air pockets, so the capacity of the pressure buffer can be reduced.

In FIG. 2A, the horizontal pipe 28 and the pipe 31 are drawn in a straight line, but the invention is not limited to this, and as shown in FIG. may be

In the water sealing structure 34, a V-shaped portion (not shown) may be provided instead of the descending portion 34A, the horizontal portion 34B and the ascending portion 34C.

10... drainage structure, 12... siphon drainage system, 14... drainage stack, 15... building, 16... vertical pipe, 21... dishwasher (one water-related equipment), 22... sink (other water-related equipment), 28... Horizontal pipe 28A...Upstream end 31...Piping 31A...Connecting part 32...Piping 32A...Connecting part 34...Water sealing structure (air retention suppressing part) 34F...Slanted part 36 ... Pressure buffering part 41 ... Drainage trap 42 ... Drainage trap 46 ... Cleaning port A ... Downstream end of water sealing structure B ... Connection part between pressure buffering part and pipe

Claims (5)

two plumbing equipment,
a pipe connected to the downstream side of the drain trap provided in each of the water-related equipment;
a horizontal draw pipe, to which the pipes are respectively connected to the ends on the upstream side, for laterally flowing the wastewater flowing through the pipes from the plumbing equipment;
an air-stagnation suppressing part provided in the pipe on one side of the water-related equipment and suppressing air-stagnation in the pipe;
The horizontal flow path length from the drainage trap to the connecting portion to the horizontal pipe in the pipe on one of the water-related equipment sides is equal to the horizontal flow path length from the drainage trap in the pipe on the other water-related equipment side. It is set longer than the lateral channel length to the connection to the pull pipe ,
The air entrapment suppressing part has a water sealing structure in which the inside of the pipe is filled with water when water is not drained from the one water-related device,
The water sealing structure is configured such that the flow path of the pipe is once lowered, raised, and lowered again from the water-related equipment on the side having the water sealing structure to the connection part,
In the water sealing structure, the drainage structure is provided with a sloped portion that slopes obliquely with respect to a horizontal direction in a portion where the flow path moves up and down. two plumbing equipment,
a pipe connected to the downstream side of the drain trap provided in each of the water-related equipment;
a horizontal draw pipe, to which the pipes are respectively connected to the ends on the upstream side, for laterally flowing the wastewater flowing through the pipes from the plumbing equipment;
an air-stagnation suppressing part provided in the pipe on one side of the water-related equipment and suppressing air-stagnation in the pipe;
The horizontal flow path length from the drainage trap to the connecting portion to the horizontal pipe in the pipe on one of the water-related equipment sides is equal to the horizontal flow path length from the drainage trap in the pipe on the other water-related equipment side. It is set longer than the lateral channel length to the connection to the pull pipe,
The air entrapment suppressing part has a water sealing structure in which the inside of the pipe is filled with water when water is not drained from the one water-related device,
The water sealing structure is configured such that the flow path of the pipe is once lowered, raised, and lowered again from the water-related equipment on the side having the water sealing structure to the connection part,
A horizontal portion is provided between the flow path of the piping in the water sealing structure once going down and going up,
A drainage structure in which the horizontal portion is provided over the horizontal pipe and extends along the horizontal pipe. two plumbing equipment,
a pipe connected to the downstream side of the drain trap provided in each of the water-related equipment;
a horizontal draw pipe, to which the pipes are respectively connected to the ends on the upstream side, for laterally flowing the wastewater flowing through the pipes from the plumbing equipment;
an air-stagnation suppressing part provided in the pipe on one side of the water-related equipment and suppressing air-stagnation in the pipe;
The horizontal flow path length from the drainage trap to the connecting portion to the horizontal pipe in the pipe on one of the water-related equipment sides is equal to the horizontal flow path length from the drainage trap in the pipe on the other water-related equipment side. It is set longer than the lateral channel length to the connection to the pull pipe,
The air entrapment suppressing part has a water sealing structure in which the inside of the pipe is filled with water when water is not drained from the one water-related device,
The pipe on the other side of the water-related equipment is provided with a pressure buffer,
The allowable capacity of the pressure buffering portion is from the downstream end of the water sealing structure in the pipe on the one plumbing device side to the connection position of the pressure buffering portion in the pipe on the other plumbing device side. drainage structure greater than the sum of the volumes of The drainage structure according to any one of claims 1 to 3 , wherein a cleaning port is provided in a portion of the pipe having the water sealing structure that does not constitute the water sealing structure. A drainage stack arranged in the vertical direction of the building;
a drainage structure according to any one of claims 1 to 4 ;
A vertical pipe that is connected to the vertical drainage pipe and allows the drainage from the horizontal pipe to flow downward;
siphon drainage system.

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